drivers/android/binder.c

   1 /* binder.c
   2  *
   3  * Android IPC Subsystem
   4  *
   5  * Copyright (C) 2007-2008 Google, Inc.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <asm/cacheflush.h>
  21 #include <linux/fdtable.h>
  22 #include <linux/file.h>
  23 #include <linux/freezer.h>
  24 #include <linux/fs.h>
  25 #include <linux/list.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/mm.h>
  28 #include <linux/module.h>
  29 #include <linux/mutex.h>
  30 #include <linux/nsproxy.h>
  31 #include <linux/poll.h>
  32 #include <linux/debugfs.h>
  33 #include <linux/rbtree.h>
  34 #include <linux/sched/signal.h>
  35 #include <linux/sched/mm.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/slab.h>
  40 #include <linux/pid_namespace.h>
  41 #include <linux/security.h>
  42
  43 #ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
  44 #define BINDER_IPC_32BIT 1
  45 #endif
  46
  47 #include <uapi/linux/android/binder.h>
  48 #include "binder_trace.h"
  49
  50 static DEFINE_MUTEX(binder_main_lock);
  51 static DEFINE_MUTEX(binder_deferred_lock);
  52 static DEFINE_MUTEX(binder_mmap_lock);
  53
  54 static HLIST_HEAD(binder_devices);
  55 static HLIST_HEAD(binder_procs);
  56 static HLIST_HEAD(binder_deferred_list);
  57 static HLIST_HEAD(binder_dead_nodes);
  58
  59 static struct dentry *binder_debugfs_dir_entry_root;
  60 static struct dentry *binder_debugfs_dir_entry_proc;
  61 static int binder_last_id;
  62
  63 #define BINDER_DEBUG_ENTRY(name) \
  64 static int binder_##name##_open(struct inode *inode, struct file *file) \
  65 { \
  66         return single_open(file, binder_##name##_show, inode->i_private); \
  67 } \
  68 \
  69 static const struct file_operations binder_##name##_fops = { \
  70         .owner = THIS_MODULE, \
  71         .open = binder_##name##_open, \
  72         .read = seq_read, \
  73         .llseek = seq_lseek, \
  74         .release = single_release, \
  75 }
  76
  77 static int binder_proc_show(struct seq_file *m, void *unused);
  78 BINDER_DEBUG_ENTRY(proc);
  79
  80 /* This is only defined in include/asm-arm/sizes.h */
  81 #ifndef SZ_1K
  82 #define SZ_1K                               0x400
  83 #endif
  84
  85 #ifndef SZ_4M
  86 #define SZ_4M                               0x400000
  87 #endif
  88
  89 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  90
  91 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  92
  93 enum {
  94         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  95         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  96         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  97         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  98         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
  99         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
 100         BINDER_DEBUG_READ_WRITE             = 1U << 6,
 101         BINDER_DEBUG_USER_REFS              = 1U << 7,
 102         BINDER_DEBUG_THREADS                = 1U << 8,
 103         BINDER_DEBUG_TRANSACTION            = 1U << 9,
 104         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 105         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 106         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 107         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
 108         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 109         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 110 };
 111 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 112         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 113 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 114
 115 static bool binder_debug_no_lock;
 116 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 117
 118 static char *binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;
 119 module_param_named(devices, binder_devices_param, charp, 0444);
 120
 121 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 122 static int binder_stop_on_user_error;
 123
 124 static int binder_set_stop_on_user_error(const char *val,
 125                                          struct kernel_param *kp)
 126 {
 127         int ret;
 128
 129         ret = param_set_int(val, kp);
 130         if (binder_stop_on_user_error < 2)
 131                 wake_up(&binder_user_error_wait);
 132         return ret;
 133 }
 134 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 135         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 136
 137 #define binder_debug(mask, x...) \
 138         do { \
 139                 if (binder_debug_mask & mask) \
 140                         pr_info(x); \
 141         } while (0)
 142
 143 #define binder_user_error(x...) \
 144         do { \
 145                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 146                         pr_info(x); \
 147                 if (binder_stop_on_user_error) \
 148                         binder_stop_on_user_error = 2; \
 149         } while (0)
 150
 151 #define to_flat_binder_object(hdr) \
 152         container_of(hdr, struct flat_binder_object, hdr)
 153
 154 #define to_binder_fd_object(hdr) container_of(hdr, struct binder_fd_object, hdr)
 155
 156 #define to_binder_buffer_object(hdr) \
 157         container_of(hdr, struct binder_buffer_object, hdr)
 158
 159 #define to_binder_fd_array_object(hdr) \
 160         container_of(hdr, struct binder_fd_array_object, hdr)
 161
 162 enum binder_stat_types {
 163         BINDER_STAT_PROC,
 164         BINDER_STAT_THREAD,
 165         BINDER_STAT_NODE,
 166         BINDER_STAT_REF,
 167         BINDER_STAT_DEATH,
 168         BINDER_STAT_TRANSACTION,
 169         BINDER_STAT_TRANSACTION_COMPLETE,
 170         BINDER_STAT_COUNT
 171 };
 172
 173 struct binder_stats {
 174         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 175         int bc[_IOC_NR(BC_REPLY_SG) + 1];
 176         int obj_created[BINDER_STAT_COUNT];
 177         int obj_deleted[BINDER_STAT_COUNT];
 178 };
 179
 180 static struct binder_stats binder_stats;
 181
 182 static inline void binder_stats_deleted(enum binder_stat_types type)
 183 {
 184         binder_stats.obj_deleted[type]++;
 185 }
 186
 187 static inline void binder_stats_created(enum binder_stat_types type)
 188 {
 189         binder_stats.obj_created[type]++;
 190 }
 191
 192 struct binder_transaction_log_entry {
 193         int debug_id;
 194         int call_type;
 195         int from_proc;
 196         int from_thread;
 197         int target_handle;
 198         int to_proc;
 199         int to_thread;
 200         int to_node;
 201         int data_size;
 202         int offsets_size;
 203         const char *context_name;
 204 };
 205 struct binder_transaction_log {
 206         int next;
 207         int full;
 208         struct binder_transaction_log_entry entry[32];
 209 };
 210 static struct binder_transaction_log binder_transaction_log;
 211 static struct binder_transaction_log binder_transaction_log_failed;
 212
 213 static struct binder_transaction_log_entry *binder_transaction_log_add(
 214         struct binder_transaction_log *log)
 215 {
 216         struct binder_transaction_log_entry *e;
 217
 218         e = &log->entry[log->next];
 219         memset(e, 0, sizeof(*e));
 220         log->next++;
 221         if (log->next == ARRAY_SIZE(log->entry)) {
 222                 log->next = 0;
 223                 log->full = 1;
 224         }
 225         return e;
 226 }
 227
 228 struct binder_context {
 229         struct binder_node *binder_context_mgr_node;
 230         kuid_t binder_context_mgr_uid;
 231         const char *name;
 232 };
 233
 234 struct binder_device {
 235         struct hlist_node hlist;
 236         struct miscdevice miscdev;
 237         struct binder_context context;
 238 };
 239
 240 struct binder_work {
 241         struct list_head entry;
 242         enum {
 243                 BINDER_WORK_TRANSACTION = 1,
 244                 BINDER_WORK_TRANSACTION_COMPLETE,
 245                 BINDER_WORK_NODE,
 246                 BINDER_WORK_DEAD_BINDER,
 247                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 248                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 249         } type;
 250 };
 251
 252 struct binder_node {
 253         int debug_id;
 254         struct binder_work work;
 255         union {
 256                 struct rb_node rb_node;
 257                 struct hlist_node dead_node;
 258         };
 259         struct binder_proc *proc;
 260         struct hlist_head refs;
 261         int internal_strong_refs;
 262         int local_weak_refs;
 263         int local_strong_refs;
 264         binder_uintptr_t ptr;
 265         binder_uintptr_t cookie;
 266         unsigned has_strong_ref:1;
 267         unsigned pending_strong_ref:1;
 268         unsigned has_weak_ref:1;
 269         unsigned pending_weak_ref:1;
 270         unsigned has_async_transaction:1;
 271         unsigned accept_fds:1;
 272         unsigned min_priority:8;
 273         struct list_head async_todo;
 274 };
 275
 276 struct binder_ref_death {
 277         struct binder_work work;
 278         binder_uintptr_t cookie;
 279 };
 280
 281 struct binder_ref {
 282         /* Lookups needed: */
 283         /*   node + proc => ref (transaction) */
 284         /*   desc + proc => ref (transaction, inc/dec ref) */
 285         /*   node => refs + procs (proc exit) */
 286         int debug_id;
 287         struct rb_node rb_node_desc;
 288         struct rb_node rb_node_node;
 289         struct hlist_node node_entry;
 290         struct binder_proc *proc;
 291         struct binder_node *node;
 292         uint32_t desc;
 293         int strong;
 294         int weak;
 295         struct binder_ref_death *death;
 296 };
 297
 298 struct binder_buffer {
 299         struct list_head entry; /* free and allocated entries by address */
 300         struct rb_node rb_node; /* free entry by size or allocated entry */
 301                                 /* by address */
 302         unsigned free:1;
 303         unsigned allow_user_free:1;
 304         unsigned async_transaction:1;
 305         unsigned debug_id:29;
 306
 307         struct binder_transaction *transaction;
 308
 309         struct binder_node *target_node;
 310         size_t data_size;
 311         size_t offsets_size;
 312         size_t extra_buffers_size;
 313         uint8_t data[0];
 314 };
 315
 316 enum binder_deferred_state {
 317         BINDER_DEFERRED_PUT_FILES    = 0x01,
 318         BINDER_DEFERRED_FLUSH        = 0x02,
 319         BINDER_DEFERRED_RELEASE      = 0x04,
 320 };
 321
 322 struct binder_proc {
 323         struct hlist_node proc_node;
 324         struct rb_root threads;
 325         struct rb_root nodes;
 326         struct rb_root refs_by_desc;
 327         struct rb_root refs_by_node;
 328         int pid;
 329         struct vm_area_struct *vma;
 330         struct mm_struct *vma_vm_mm;
 331         struct task_struct *tsk;
 332         struct files_struct *files;
 333         struct hlist_node deferred_work_node;
 334         int deferred_work;
 335         void *buffer;
 336         ptrdiff_t user_buffer_offset;
 337
 338         struct list_head buffers;
 339         struct rb_root free_buffers;
 340         struct rb_root allocated_buffers;
 341         size_t free_async_space;
 342
 343         struct page **pages;
 344         size_t buffer_size;
 345         uint32_t buffer_free;
 346         struct list_head todo;
 347         wait_queue_head_t wait;
 348         struct binder_stats stats;
 349         struct list_head delivered_death;
 350         int max_threads;
 351         int requested_threads;
 352         int requested_threads_started;
 353         int ready_threads;
 354         long default_priority;
 355         struct dentry *debugfs_entry;
 356         struct binder_context *context;
 357 };
 358
 359 enum {
 360         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 361         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 362         BINDER_LOOPER_STATE_EXITED      = 0x04,
 363         BINDER_LOOPER_STATE_INVALID     = 0x08,
 364         BINDER_LOOPER_STATE_WAITING     = 0x10,
 365         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 366 };
 367
 368 struct binder_thread {
 369         struct binder_proc *proc;
 370         struct rb_node rb_node;
 371         int pid;
 372         int looper;
 373         struct binder_transaction *transaction_stack;
 374         struct list_head todo;
 375         uint32_t return_error; /* Write failed, return error code in read buf */
 376         uint32_t return_error2; /* Write failed, return error code in read */
 377                 /* buffer. Used when sending a reply to a dead process that */
 378                 /* we are also waiting on */
 379         wait_queue_head_t wait;
 380         struct binder_stats stats;
 381 };
 382
 383 struct binder_transaction {
 384         int debug_id;
 385         struct binder_work work;
 386         struct binder_thread *from;
 387         struct binder_transaction *from_parent;
 388         struct binder_proc *to_proc;
 389         struct binder_thread *to_thread;
 390         struct binder_transaction *to_parent;
 391         unsigned need_reply:1;
 392         /* unsigned is_dead:1; */       /* not used at the moment */
 393
 394         struct binder_buffer *buffer;
 395         unsigned int    code;
 396         unsigned int    flags;
 397         long    priority;
 398         long    saved_priority;
 399         kuid_t  sender_euid;
 400 };
 401
 402 static void
 403 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 404
 405 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 406 {
 407         struct files_struct *files = proc->files;
 408         unsigned long rlim_cur;
 409         unsigned long irqs;
 410
 411         if (files == NULL)
 412                 return -ESRCH;
 413
 414         if (!lock_task_sighand(proc->tsk, &irqs))
 415                 return -EMFILE;
 416
 417         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 418         unlock_task_sighand(proc->tsk, &irqs);
 419
 420         return __alloc_fd(files, 0, rlim_cur, flags);
 421 }
 422
 423 /*
 424  * copied from fd_install
 425  */
 426 static void task_fd_install(
 427         struct binder_proc *proc, unsigned int fd, struct file *file)
 428 {
 429         if (proc->files)
 430                 __fd_install(proc->files, fd, file);
 431 }
 432
 433 /*
 434  * copied from sys_close
 435  */
 436 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 437 {
 438         int retval;
 439
 440         if (proc->files == NULL)
 441                 return -ESRCH;
 442
 443         retval = __close_fd(proc->files, fd);
 444         /* can't restart close syscall because file table entry was cleared */
 445         if (unlikely(retval == -ERESTARTSYS ||
 446                      retval == -ERESTARTNOINTR ||
 447                      retval == -ERESTARTNOHAND ||
 448                      retval == -ERESTART_RESTARTBLOCK))
 449                 retval = -EINTR;
 450
 451         return retval;
 452 }
 453
 454 static inline void binder_lock(const char *tag)
 455 {
 456         trace_binder_lock(tag);
 457         mutex_lock(&binder_main_lock);
 458         trace_binder_locked(tag);
 459 }
 460
 461 static inline void binder_unlock(const char *tag)
 462 {
 463         trace_binder_unlock(tag);
 464         mutex_unlock(&binder_main_lock);
 465 }
 466
 467 static void binder_set_nice(long nice)
 468 {
 469         long min_nice;
 470
 471         if (can_nice(current, nice)) {
 472                 set_user_nice(current, nice);
 473                 return;
 474         }
 475         min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
 476         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 477                      "%d: nice value %ld not allowed use %ld instead\n",
 478                       current->pid, nice, min_nice);
 479         set_user_nice(current, min_nice);
 480         if (min_nice <= MAX_NICE)
 481                 return;
 482         binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 483 }
 484
 485 static size_t binder_buffer_size(struct binder_proc *proc,
 486                                  struct binder_buffer *buffer)
 487 {
 488         if (list_is_last(&buffer->entry, &proc->buffers))
 489                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 490         return (size_t)list_entry(buffer->entry.next,
 491                           struct binder_buffer, entry) - (size_t)buffer->data;
 492 }
 493
 494 static void binder_insert_free_buffer(struct binder_proc *proc,
 495                                       struct binder_buffer *new_buffer)
 496 {
 497         struct rb_node **p = &proc->free_buffers.rb_node;
 498         struct rb_node *parent = NULL;
 499         struct binder_buffer *buffer;
 500         size_t buffer_size;
 501         size_t new_buffer_size;
 502
 503         BUG_ON(!new_buffer->free);
 504
 505         new_buffer_size = binder_buffer_size(proc, new_buffer);
 506
 507         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 508                      "%d: add free buffer, size %zd, at %p\n",
 509                       proc->pid, new_buffer_size, new_buffer);
 510
 511         while (*p) {
 512                 parent = *p;
 513                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 514                 BUG_ON(!buffer->free);
 515
 516                 buffer_size = binder_buffer_size(proc, buffer);
 517
 518                 if (new_buffer_size < buffer_size)
 519                         p = &parent->rb_left;
 520                 else
 521                         p = &parent->rb_right;
 522         }
 523         rb_link_node(&new_buffer->rb_node, parent, p);
 524         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 525 }
 526
 527 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 528                                            struct binder_buffer *new_buffer)
 529 {
 530         struct rb_node **p = &proc->allocated_buffers.rb_node;
 531         struct rb_node *parent = NULL;
 532         struct binder_buffer *buffer;
 533
 534         BUG_ON(new_buffer->free);
 535
 536         while (*p) {
 537                 parent = *p;
 538                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 539                 BUG_ON(buffer->free);
 540
 541                 if (new_buffer < buffer)
 542                         p = &parent->rb_left;
 543                 else if (new_buffer > buffer)
 544                         p = &parent->rb_right;
 545                 else
 546                         BUG();
 547         }
 548         rb_link_node(&new_buffer->rb_node, parent, p);
 549         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 550 }
 551
 552 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 553                                                   uintptr_t user_ptr)
 554 {
 555         struct rb_node *n = proc->allocated_buffers.rb_node;
 556         struct binder_buffer *buffer;
 557         struct binder_buffer *kern_ptr;
 558
 559         kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
 560                 - offsetof(struct binder_buffer, data));
 561
 562         while (n) {
 563                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 564                 BUG_ON(buffer->free);
 565
 566                 if (kern_ptr < buffer)
 567                         n = n->rb_left;
 568                 else if (kern_ptr > buffer)
 569                         n = n->rb_right;
 570                 else
 571                         return buffer;
 572         }
 573         return NULL;
 574 }
 575
 576 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 577                                     void *start, void *end,
 578                                     struct vm_area_struct *vma)
 579 {
 580         void *page_addr;
 581         unsigned long user_page_addr;
 582         struct page **page;
 583         struct mm_struct *mm;
 584
 585         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 586                      "%d: %s pages %p-%p\n", proc->pid,
 587                      allocate ? "allocate" : "free", start, end);
 588
 589         if (end <= start)
 590                 return 0;
 591
 592         trace_binder_update_page_range(proc, allocate, start, end);
 593
 594         if (vma)
 595                 mm = NULL;
 596         else
 597                 mm = get_task_mm(proc->tsk);
 598
 599         if (mm) {
 600                 down_write(&mm->mmap_sem);
 601                 vma = proc->vma;
 602                 if (vma && mm != proc->vma_vm_mm) {
 603                         pr_err("%d: vma mm and task mm mismatch\n",
 604                                 proc->pid);
 605                         vma = NULL;
 606                 }
 607         }
 608
 609         if (allocate == 0)
 610                 goto free_range;
 611
 612         if (vma == NULL) {
 613                 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 614                         proc->pid);
 615                 goto err_no_vma;
 616         }
 617
 618         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 619                 int ret;
 620
 621                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 622
 623                 BUG_ON(*page);
 624                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 625                 if (*page == NULL) {
 626                         pr_err("%d: binder_alloc_buf failed for page at %p\n",
 627                                 proc->pid, page_addr);
 628                         goto err_alloc_page_failed;
 629                 }
 630                 ret = map_kernel_range_noflush((unsigned long)page_addr,
 631                                         PAGE_SIZE, PAGE_KERNEL, page);
 632                 flush_cache_vmap((unsigned long)page_addr,
 633                                 (unsigned long)page_addr + PAGE_SIZE);
 634                 if (ret != 1) {
 635                         pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
 636                                proc->pid, page_addr);
 637                         goto err_map_kernel_failed;
 638                 }
 639                 user_page_addr =
 640                         (uintptr_t)page_addr + proc->user_buffer_offset;
 641                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 642                 if (ret) {
 643                         pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 644                                proc->pid, user_page_addr);
 645                         goto err_vm_insert_page_failed;
 646                 }
 647                 /* vm_insert_page does not seem to increment the refcount */
 648         }
 649         if (mm) {
 650                 up_write(&mm->mmap_sem);
 651                 mmput(mm);
 652         }
 653         return 0;
 654
 655 free_range:
 656         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 657              page_addr -= PAGE_SIZE) {
 658                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 659                 if (vma)
 660                         zap_page_range(vma, (uintptr_t)page_addr +
 661                                 proc->user_buffer_offset, PAGE_SIZE);
 662 err_vm_insert_page_failed:
 663                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 664 err_map_kernel_failed:
 665                 __free_page(*page);
 666                 *page = NULL;
 667 err_alloc_page_failed:
 668                 ;
 669         }
 670 err_no_vma:
 671         if (mm) {
 672                 up_write(&mm->mmap_sem);
 673                 mmput(mm);
 674         }
 675         return -ENOMEM;
 676 }
 677
 678 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 679                                               size_t data_size,
 680                                               size_t offsets_size,
 681                                               size_t extra_buffers_size,
 682                                               int is_async)
 683 {
 684         struct rb_node *n = proc->free_buffers.rb_node;
 685         struct binder_buffer *buffer;
 686         size_t buffer_size;
 687         struct rb_node *best_fit = NULL;
 688         void *has_page_addr;
 689         void *end_page_addr;
 690         size_t size, data_offsets_size;
 691
 692         if (proc->vma == NULL) {
 693                 pr_err("%d: binder_alloc_buf, no vma\n",
 694                        proc->pid);
 695                 return NULL;
 696         }
 697
 698         data_offsets_size = ALIGN(data_size, sizeof(void *)) +
 699                 ALIGN(offsets_size, sizeof(void *));
 700
 701         if (data_offsets_size < data_size || data_offsets_size < offsets_size) {
 702                 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 703                                 proc->pid, data_size, offsets_size);
 704                 return NULL;
 705         }
 706         size = data_offsets_size + ALIGN(extra_buffers_size, sizeof(void *));
 707         if (size < data_offsets_size || size < extra_buffers_size) {
 708                 binder_user_error("%d: got transaction with invalid extra_buffers_size %zd\n",
 709                                   proc->pid, extra_buffers_size);
 710                 return NULL;
 711         }
 712         if (is_async &&
 713             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 714                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 715                              "%d: binder_alloc_buf size %zd failed, no async space left\n",
 716                               proc->pid, size);
 717                 return NULL;
 718         }
 719
 720         while (n) {
 721                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 722                 BUG_ON(!buffer->free);
 723                 buffer_size = binder_buffer_size(proc, buffer);
 724
 725                 if (size < buffer_size) {
 726                         best_fit = n;
 727                         n = n->rb_left;
 728                 } else if (size > buffer_size)
 729                         n = n->rb_right;
 730                 else {
 731                         best_fit = n;
 732                         break;
 733                 }
 734         }
 735         if (best_fit == NULL) {
 736                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 737                         proc->pid, size);
 738                 return NULL;
 739         }
 740         if (n == NULL) {
 741                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 742                 buffer_size = binder_buffer_size(proc, buffer);
 743         }
 744
 745         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 746                      "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
 747                       proc->pid, size, buffer, buffer_size);
 748
 749         has_page_addr =
 750                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 751         if (n == NULL) {
 752                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 753                         buffer_size = size; /* no room for other buffers */
 754                 else
 755                         buffer_size = size + sizeof(struct binder_buffer);
 756         }
 757         end_page_addr =
 758                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 759         if (end_page_addr > has_page_addr)
 760                 end_page_addr = has_page_addr;
 761         if (binder_update_page_range(proc, 1,
 762             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 763                 return NULL;
 764
 765         rb_erase(best_fit, &proc->free_buffers);
 766         buffer->free = 0;
 767         binder_insert_allocated_buffer(proc, buffer);
 768         if (buffer_size != size) {
 769                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 770
 771                 list_add(&new_buffer->entry, &buffer->entry);
 772                 new_buffer->free = 1;
 773                 binder_insert_free_buffer(proc, new_buffer);
 774         }
 775         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 776                      "%d: binder_alloc_buf size %zd got %p\n",
 777                       proc->pid, size, buffer);
 778         buffer->data_size = data_size;
 779         buffer->offsets_size = offsets_size;
 780         buffer->extra_buffers_size = extra_buffers_size;
 781         buffer->async_transaction = is_async;
 782         if (is_async) {
 783                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 784                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 785                              "%d: binder_alloc_buf size %zd async free %zd\n",
 786                               proc->pid, size, proc->free_async_space);
 787         }
 788
 789         return buffer;
 790 }
 791
 792 static void *buffer_start_page(struct binder_buffer *buffer)
 793 {
 794         return (void *)((uintptr_t)buffer & PAGE_MASK);
 795 }
 796
 797 static void *buffer_end_page(struct binder_buffer *buffer)
 798 {
 799         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 800 }
 801
 802 static void binder_delete_free_buffer(struct binder_proc *proc,
 803                                       struct binder_buffer *buffer)
 804 {
 805         struct binder_buffer *prev, *next = NULL;
 806         int free_page_end = 1;
 807         int free_page_start = 1;
 808
 809         BUG_ON(proc->buffers.next == &buffer->entry);
 810         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 811         BUG_ON(!prev->free);
 812         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 813                 free_page_start = 0;
 814                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 815                         free_page_end = 0;
 816                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 817                              "%d: merge free, buffer %p share page with %p\n",
 818                               proc->pid, buffer, prev);
 819         }
 820
 821         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 822                 next = list_entry(buffer->entry.next,
 823                                   struct binder_buffer, entry);
 824                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 825                         free_page_end = 0;
 826                         if (buffer_start_page(next) ==
 827                             buffer_start_page(buffer))
 828                                 free_page_start = 0;
 829                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 830                                      "%d: merge free, buffer %p share page with %p\n",
 831                                       proc->pid, buffer, prev);
 832                 }
 833         }
 834         list_del(&buffer->entry);
 835         if (free_page_start || free_page_end) {
 836                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 837                              "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
 838                              proc->pid, buffer, free_page_start ? "" : " end",
 839                              free_page_end ? "" : " start", prev, next);
 840                 binder_update_page_range(proc, 0, free_page_start ?
 841                         buffer_start_page(buffer) : buffer_end_page(buffer),
 842                         (free_page_end ? buffer_end_page(buffer) :
 843                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 844         }
 845 }
 846
 847 static void binder_free_buf(struct binder_proc *proc,
 848                             struct binder_buffer *buffer)
 849 {
 850         size_t size, buffer_size;
 851
 852         buffer_size = binder_buffer_size(proc, buffer);
 853
 854         size = ALIGN(buffer->data_size, sizeof(void *)) +
 855                 ALIGN(buffer->offsets_size, sizeof(void *)) +
 856                 ALIGN(buffer->extra_buffers_size, sizeof(void *));
 857
 858         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 859                      "%d: binder_free_buf %p size %zd buffer_size %zd\n",
 860                       proc->pid, buffer, size, buffer_size);
 861
 862         BUG_ON(buffer->free);
 863         BUG_ON(size > buffer_size);
 864         BUG_ON(buffer->transaction != NULL);
 865         BUG_ON((void *)buffer < proc->buffer);
 866         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 867
 868         if (buffer->async_transaction) {
 869                 proc->free_async_space += size + sizeof(struct binder_buffer);
 870
 871                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 872                              "%d: binder_free_buf size %zd async free %zd\n",
 873                               proc->pid, size, proc->free_async_space);
 874         }
 875
 876         binder_update_page_range(proc, 0,
 877                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 878                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 879                 NULL);
 880         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 881         buffer->free = 1;
 882         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 883                 struct binder_buffer *next = list_entry(buffer->entry.next,
 884                                                 struct binder_buffer, entry);
 885
 886                 if (next->free) {
 887                         rb_erase(&next->rb_node, &proc->free_buffers);
 888                         binder_delete_free_buffer(proc, next);
 889                 }
 890         }
 891         if (proc->buffers.next != &buffer->entry) {
 892                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 893                                                 struct binder_buffer, entry);
 894
 895                 if (prev->free) {
 896                         binder_delete_free_buffer(proc, buffer);
 897                         rb_erase(&prev->rb_node, &proc->free_buffers);
 898                         buffer = prev;
 899                 }
 900         }
 901         binder_insert_free_buffer(proc, buffer);
 902 }
 903
 904 static struct binder_node *binder_get_node(struct binder_proc *proc,
 905                                            binder_uintptr_t ptr)
 906 {
 907         struct rb_node *n = proc->nodes.rb_node;
 908         struct binder_node *node;
 909
 910         while (n) {
 911                 node = rb_entry(n, struct binder_node, rb_node);
 912
 913                 if (ptr < node->ptr)
 914                         n = n->rb_left;
 915                 else if (ptr > node->ptr)
 916                         n = n->rb_right;
 917                 else
 918                         return node;
 919         }
 920         return NULL;
 921 }
 922
 923 static struct binder_node *binder_new_node(struct binder_proc *proc,
 924                                            binder_uintptr_t ptr,
 925                                            binder_uintptr_t cookie)
 926 {
 927         struct rb_node **p = &proc->nodes.rb_node;
 928         struct rb_node *parent = NULL;
 929         struct binder_node *node;
 930
 931         while (*p) {
 932                 parent = *p;
 933                 node = rb_entry(parent, struct binder_node, rb_node);
 934
 935                 if (ptr < node->ptr)
 936                         p = &(*p)->rb_left;
 937                 else if (ptr > node->ptr)
 938                         p = &(*p)->rb_right;
 939                 else
 940                         return NULL;
 941         }
 942
 943         node = kzalloc(sizeof(*node), GFP_KERNEL);
 944         if (node == NULL)
 945                 return NULL;
 946         binder_stats_created(BINDER_STAT_NODE);
 947         rb_link_node(&node->rb_node, parent, p);
 948         rb_insert_color(&node->rb_node, &proc->nodes);
 949         node->debug_id = ++binder_last_id;
 950         node->proc = proc;
 951         node->ptr = ptr;
 952         node->cookie = cookie;
 953         node->work.type = BINDER_WORK_NODE;
 954         INIT_LIST_HEAD(&node->work.entry);
 955         INIT_LIST_HEAD(&node->async_todo);
 956         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 957                      "%d:%d node %d u%016llx c%016llx created\n",
 958                      proc->pid, current->pid, node->debug_id,
 959                      (u64)node->ptr, (u64)node->cookie);
 960         return node;
 961 }
 962
 963 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 964                            struct list_head *target_list)
 965 {
 966         if (strong) {
 967                 if (internal) {
 968                         if (target_list == NULL &&
 969                             node->internal_strong_refs == 0 &&
 970                             !(node->proc &&
 971                               node == node->proc->context->binder_context_mgr_node &&
 972                               node->has_strong_ref)) {
 973                                 pr_err("invalid inc strong node for %d\n",
 974                                         node->debug_id);
 975                                 return -EINVAL;
 976                         }
 977                         node->internal_strong_refs++;
 978                 } else
 979                         node->local_strong_refs++;
 980                 if (!node->has_strong_ref && target_list) {
 981                         list_del_init(&node->work.entry);
 982                         list_add_tail(&node->work.entry, target_list);
 983                 }
 984         } else {
 985                 if (!internal)
 986                         node->local_weak_refs++;
 987                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 988                         if (target_list == NULL) {
 989                                 pr_err("invalid inc weak node for %d\n",
 990                                         node->debug_id);
 991                                 return -EINVAL;
 992                         }
 993                         list_add_tail(&node->work.entry, target_list);
 994                 }
 995         }
 996         return 0;
 997 }
 998
 999 static int binder_dec_node(struct binder_node *node, int strong, int internal)
1000 {
1001         if (strong) {
1002                 if (internal)
1003                         node->internal_strong_refs--;
1004                 else
1005                         node->local_strong_refs--;
1006                 if (node->local_strong_refs || node->internal_strong_refs)
1007                         return 0;
1008         } else {
1009                 if (!internal)
1010                         node->local_weak_refs--;
1011                 if (node->local_weak_refs || !hlist_empty(&node->refs))
1012                         return 0;
1013         }
1014         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
1015                 if (list_empty(&node->work.entry)) {
1016                         list_add_tail(&node->work.entry, &node->proc->todo);
1017                         wake_up_interruptible(&node->proc->wait);
1018                 }
1019         } else {
1020                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
1021                     !node->local_weak_refs) {
1022                         list_del_init(&node->work.entry);
1023                         if (node->proc) {
1024                                 rb_erase(&node->rb_node, &node->proc->nodes);
1025                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1026                                              "refless node %d deleted\n",
1027                                              node->debug_id);
1028                         } else {
1029                                 hlist_del(&node->dead_node);
1030                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1031                                              "dead node %d deleted\n",
1032                                              node->debug_id);
1033                         }
1034                         kfree(node);
1035                         binder_stats_deleted(BINDER_STAT_NODE);
1036                 }
1037         }
1038
1039         return 0;
1040 }
1041
1042
1043 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1044                                          u32 desc, bool need_strong_ref)
1045 {
1046         struct rb_node *n = proc->refs_by_desc.rb_node;
1047         struct binder_ref *ref;
1048
1049         while (n) {
1050                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1051
1052                 if (desc < ref->desc) {
1053                         n = n->rb_left;
1054                 } else if (desc > ref->desc) {
1055                         n = n->rb_right;
1056                 } else if (need_strong_ref && !ref->strong) {
1057                         binder_user_error("tried to use weak ref as strong ref\n");
1058                         return NULL;
1059                 } else {
1060                         return ref;
1061                 }
1062         }
1063         return NULL;
1064 }
1065
1066 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1067                                                   struct binder_node *node)
1068 {
1069         struct rb_node *n;
1070         struct rb_node **p = &proc->refs_by_node.rb_node;
1071         struct rb_node *parent = NULL;
1072         struct binder_ref *ref, *new_ref;
1073         struct binder_context *context = proc->context;
1074
1075         while (*p) {
1076                 parent = *p;
1077                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1078
1079                 if (node < ref->node)
1080                         p = &(*p)->rb_left;
1081                 else if (node > ref->node)
1082                         p = &(*p)->rb_right;
1083                 else
1084                         return ref;
1085         }
1086         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1087         if (new_ref == NULL)
1088                 return NULL;
1089         binder_stats_created(BINDER_STAT_REF);
1090         new_ref->debug_id = ++binder_last_id;
1091         new_ref->proc = proc;
1092         new_ref->node = node;
1093         rb_link_node(&new_ref->rb_node_node, parent, p);
1094         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1095
1096         new_ref->desc = (node == context->binder_context_mgr_node) ? 0 : 1;
1097         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1098                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1099                 if (ref->desc > new_ref->desc)
1100                         break;
1101                 new_ref->desc = ref->desc + 1;
1102         }
1103
1104         p = &proc->refs_by_desc.rb_node;
1105         while (*p) {
1106                 parent = *p;
1107                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1108
1109                 if (new_ref->desc < ref->desc)
1110                         p = &(*p)->rb_left;
1111                 else if (new_ref->desc > ref->desc)
1112                         p = &(*p)->rb_right;
1113                 else
1114                         BUG();
1115         }
1116         rb_link_node(&new_ref->rb_node_desc, parent, p);
1117         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1118         if (node) {
1119                 hlist_add_head(&new_ref->node_entry, &node->refs);
1120
1121                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1122                              "%d new ref %d desc %d for node %d\n",
1123                               proc->pid, new_ref->debug_id, new_ref->desc,
1124                               node->debug_id);
1125         } else {
1126                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1127                              "%d new ref %d desc %d for dead node\n",
1128                               proc->pid, new_ref->debug_id, new_ref->desc);
1129         }
1130         return new_ref;
1131 }
1132
1133 static void binder_delete_ref(struct binder_ref *ref)
1134 {
1135         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1136                      "%d delete ref %d desc %d for node %d\n",
1137                       ref->proc->pid, ref->debug_id, ref->desc,
1138                       ref->node->debug_id);
1139
1140         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1141         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1142         if (ref->strong)
1143                 binder_dec_node(ref->node, 1, 1);
1144         hlist_del(&ref->node_entry);
1145         binder_dec_node(ref->node, 0, 1);
1146         if (ref->death) {
1147                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1148                              "%d delete ref %d desc %d has death notification\n",
1149                               ref->proc->pid, ref->debug_id, ref->desc);
1150                 list_del(&ref->death->work.entry);
1151                 kfree(ref->death);
1152                 binder_stats_deleted(BINDER_STAT_DEATH);
1153         }
1154         kfree(ref);
1155         binder_stats_deleted(BINDER_STAT_REF);
1156 }
1157
1158 static int binder_inc_ref(struct binder_ref *ref, int strong,
1159                           struct list_head *target_list)
1160 {
1161         int ret;
1162
1163         if (strong) {
1164                 if (ref->strong == 0) {
1165                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1166                         if (ret)
1167                                 return ret;
1168                 }
1169                 ref->strong++;
1170         } else {
1171                 if (ref->weak == 0) {
1172                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1173                         if (ret)
1174                                 return ret;
1175                 }
1176                 ref->weak++;
1177         }
1178         return 0;
1179 }
1180
1181
1182 static int binder_dec_ref(struct binder_ref *ref, int strong)
1183 {
1184         if (strong) {
1185                 if (ref->strong == 0) {
1186                         binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1187                                           ref->proc->pid, ref->debug_id,
1188                                           ref->desc, ref->strong, ref->weak);
1189                         return -EINVAL;
1190                 }
1191                 ref->strong--;
1192                 if (ref->strong == 0) {
1193                         int ret;
1194
1195                         ret = binder_dec_node(ref->node, strong, 1);
1196                         if (ret)
1197                                 return ret;
1198                 }
1199         } else {
1200                 if (ref->weak == 0) {
1201                         binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1202                                           ref->proc->pid, ref->debug_id,
1203                                           ref->desc, ref->strong, ref->weak);
1204                         return -EINVAL;
1205                 }
1206                 ref->weak--;
1207         }
1208         if (ref->strong == 0 && ref->weak == 0)
1209                 binder_delete_ref(ref);
1210         return 0;
1211 }
1212
1213 static void binder_pop_transaction(struct binder_thread *target_thread,
1214                                    struct binder_transaction *t)
1215 {
1216         if (target_thread) {
1217                 BUG_ON(target_thread->transaction_stack != t);
1218                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1219                 target_thread->transaction_stack =
1220                         target_thread->transaction_stack->from_parent;
1221                 t->from = NULL;
1222         }
1223         t->need_reply = 0;
1224         if (t->buffer)
1225                 t->buffer->transaction = NULL;
1226         kfree(t);
1227         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1228 }
1229
1230 static void binder_send_failed_reply(struct binder_transaction *t,
1231                                      uint32_t error_code)
1232 {
1233         struct binder_thread *target_thread;
1234         struct binder_transaction *next;
1235
1236         BUG_ON(t->flags & TF_ONE_WAY);
1237         while (1) {
1238                 target_thread = t->from;
1239                 if (target_thread) {
1240                         if (target_thread->return_error != BR_OK &&
1241                            target_thread->return_error2 == BR_OK) {
1242                                 target_thread->return_error2 =
1243                                         target_thread->return_error;
1244                                 target_thread->return_error = BR_OK;
1245                         }
1246                         if (target_thread->return_error == BR_OK) {
1247                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1248                                              "send failed reply for transaction %d to %d:%d\n",
1249                                               t->debug_id,
1250                                               target_thread->proc->pid,
1251                                               target_thread->pid);
1252
1253                                 binder_pop_transaction(target_thread, t);
1254                                 target_thread->return_error = error_code;
1255                                 wake_up_interruptible(&target_thread->wait);
1256                         } else {
1257                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1258                                         target_thread->proc->pid,
1259                                         target_thread->pid,
1260                                         target_thread->return_error);
1261                         }
1262                         return;
1263                 }
1264                 next = t->from_parent;
1265
1266                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1267                              "send failed reply for transaction %d, target dead\n",
1268                              t->debug_id);
1269
1270                 binder_pop_transaction(target_thread, t);
1271                 if (next == NULL) {
1272                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1273                                      "reply failed, no target thread at root\n");
1274                         return;
1275                 }
1276                 t = next;
1277                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1278                              "reply failed, no target thread -- retry %d\n",
1279                               t->debug_id);
1280         }
1281 }
1282
1283 /**
1284  * binder_validate_object() - checks for a valid metadata object in a buffer.
1285  * @buffer:     binder_buffer that we're parsing.
1286  * @offset:     offset in the buffer at which to validate an object.
1287  *
1288  * Return:      If there's a valid metadata object at @offset in @buffer, the
1289  *              size of that object. Otherwise, it returns zero.
1290  */
1291 static size_t binder_validate_object(struct binder_buffer *buffer, u64 offset)
1292 {
1293         /* Check if we can read a header first */
1294         struct binder_object_header *hdr;
1295         size_t object_size = 0;
1296
1297         if (offset > buffer->data_size - sizeof(*hdr) ||
1298             buffer->data_size < sizeof(*hdr) ||
1299             !IS_ALIGNED(offset, sizeof(u32)))
1300                 return 0;
1301
1302         /* Ok, now see if we can read a complete object. */
1303         hdr = (struct binder_object_header *)(buffer->data + offset);
1304         switch (hdr->type) {
1305         case BINDER_TYPE_BINDER:
1306         case BINDER_TYPE_WEAK_BINDER:
1307         case BINDER_TYPE_HANDLE:
1308         case BINDER_TYPE_WEAK_HANDLE:
1309                 object_size = sizeof(struct flat_binder_object);
1310                 break;
1311         case BINDER_TYPE_FD:
1312                 object_size = sizeof(struct binder_fd_object);
1313                 break;
1314         case BINDER_TYPE_PTR:
1315                 object_size = sizeof(struct binder_buffer_object);
1316                 break;
1317         case BINDER_TYPE_FDA:
1318                 object_size = sizeof(struct binder_fd_array_object);
1319                 break;
1320         default:
1321                 return 0;
1322         }
1323         if (offset <= buffer->data_size - object_size &&
1324             buffer->data_size >= object_size)
1325                 return object_size;
1326         else
1327                 return 0;
1328 }
1329
1330 /**
1331  * binder_validate_ptr() - validates binder_buffer_object in a binder_buffer.
1332  * @b:          binder_buffer containing the object
1333  * @index:      index in offset array at which the binder_buffer_object is
1334  *              located
1335  * @start:      points to the start of the offset array
1336  * @num_valid:  the number of valid offsets in the offset array
1337  *
1338  * Return:      If @index is within the valid range of the offset array
1339  *              described by @start and @num_valid, and if there's a valid
1340  *              binder_buffer_object at the offset found in index @index
1341  *              of the offset array, that object is returned. Otherwise,
1342  *              %NULL is returned.
1343  *              Note that the offset found in index @index itself is not
1344  *              verified; this function assumes that @num_valid elements
1345  *              from @start were previously verified to have valid offsets.
1346  */
1347 static struct binder_buffer_object *binder_validate_ptr(struct binder_buffer *b,
1348                                                         binder_size_t index,
1349                                                         binder_size_t *start,
1350                                                         binder_size_t num_valid)
1351 {
1352         struct binder_buffer_object *buffer_obj;
1353         binder_size_t *offp;
1354
1355         if (index >= num_valid)
1356                 return NULL;
1357
1358         offp = start + index;
1359         buffer_obj = (struct binder_buffer_object *)(b->data + *offp);
1360         if (buffer_obj->hdr.type != BINDER_TYPE_PTR)
1361                 return NULL;
1362
1363         return buffer_obj;
1364 }
1365
1366 /**
1367  * binder_validate_fixup() - validates pointer/fd fixups happen in order.
1368  * @b:                  transaction buffer
1369  * @objects_start       start of objects buffer
1370  * @buffer:             binder_buffer_object in which to fix up
1371  * @offset:             start offset in @buffer to fix up
1372  * @last_obj:           last binder_buffer_object that we fixed up in
1373  * @last_min_offset:    minimum fixup offset in @last_obj
1374  *
1375  * Return:              %true if a fixup in buffer @buffer at offset @offset is
1376  *                      allowed.
1377  *
1378  * For safety reasons, we only allow fixups inside a buffer to happen
1379  * at increasing offsets; additionally, we only allow fixup on the last
1380  * buffer object that was verified, or one of its parents.
1381  *
1382  * Example of what is allowed:
1383  *
1384  * A
1385  *   B (parent = A, offset = 0)
1386  *   C (parent = A, offset = 16)
1387  *     D (parent = C, offset = 0)
1388  *   E (parent = A, offset = 32) // min_offset is 16 (C.parent_offset)
1389  *
1390  * Examples of what is not allowed:
1391  *
1392  * Decreasing offsets within the same parent:
1393  * A
1394  *   C (parent = A, offset = 16)
1395  *   B (parent = A, offset = 0) // decreasing offset within A
1396  *
1397  * Referring to a parent that wasn't the last object or any of its parents:
1398  * A
1399  *   B (parent = A, offset = 0)
1400  *   C (parent = A, offset = 0)
1401  *   C (parent = A, offset = 16)
1402  *     D (parent = B, offset = 0) // B is not A or any of A's parents
1403  */
1404 static bool binder_validate_fixup(struct binder_buffer *b,
1405                                   binder_size_t *objects_start,
1406                                   struct binder_buffer_object *buffer,
1407                                   binder_size_t fixup_offset,
1408                                   struct binder_buffer_object *last_obj,
1409                                   binder_size_t last_min_offset)
1410 {
1411         if (!last_obj) {
1412                 /* Nothing to fix up in */
1413                 return false;
1414         }
1415
1416         while (last_obj != buffer) {
1417                 /*
1418                  * Safe to retrieve the parent of last_obj, since it
1419                  * was already previously verified by the driver.
1420                  */
1421                 if ((last_obj->flags & BINDER_BUFFER_FLAG_HAS_PARENT) == 0)
1422                         return false;
1423                 last_min_offset = last_obj->parent_offset + sizeof(uintptr_t);
1424                 last_obj = (struct binder_buffer_object *)
1425                         (b->data + *(objects_start + last_obj->parent));
1426         }
1427         return (fixup_offset >= last_min_offset);
1428 }
1429
1430 static void binder_transaction_buffer_release(struct binder_proc *proc,
1431                                               struct binder_buffer *buffer,
1432                                               binder_size_t *failed_at)
1433 {
1434         binder_size_t *offp, *off_start, *off_end;
1435         int debug_id = buffer->debug_id;
1436
1437         binder_debug(BINDER_DEBUG_TRANSACTION,
1438                      "%d buffer release %d, size %zd-%zd, failed at %p\n",
1439                      proc->pid, buffer->debug_id,
1440                      buffer->data_size, buffer->offsets_size, failed_at);
1441
1442         if (buffer->target_node)
1443                 binder_dec_node(buffer->target_node, 1, 0);
1444
1445         off_start = (binder_size_t *)(buffer->data +
1446                                       ALIGN(buffer->data_size, sizeof(void *)));
1447         if (failed_at)
1448                 off_end = failed_at;
1449         else
1450                 off_end = (void *)off_start + buffer->offsets_size;
1451         for (offp = off_start; offp < off_end; offp++) {
1452                 struct binder_object_header *hdr;
1453                 size_t object_size = binder_validate_object(buffer, *offp);
1454
1455                 if (object_size == 0) {
1456                         pr_err("transaction release %d bad object at offset %lld, size %zd\n",
1457                                debug_id, (u64)*offp, buffer->data_size);
1458                         continue;
1459                 }
1460                 hdr = (struct binder_object_header *)(buffer->data + *offp);
1461                 switch (hdr->type) {
1462                 case BINDER_TYPE_BINDER:
1463                 case BINDER_TYPE_WEAK_BINDER: {
1464                         struct flat_binder_object *fp;
1465                         struct binder_node *node;
1466
1467                         fp = to_flat_binder_object(hdr);
1468                         node = binder_get_node(proc, fp->binder);
1469                         if (node == NULL) {
1470                                 pr_err("transaction release %d bad node %016llx\n",
1471                                        debug_id, (u64)fp->binder);
1472                                 break;
1473                         }
1474                         binder_debug(BINDER_DEBUG_TRANSACTION,
1475                                      "        node %d u%016llx\n",
1476                                      node->debug_id, (u64)node->ptr);
1477                         binder_dec_node(node, hdr->type == BINDER_TYPE_BINDER,
1478                                         0);
1479                 } break;
1480                 case BINDER_TYPE_HANDLE:
1481                 case BINDER_TYPE_WEAK_HANDLE: {
1482                         struct flat_binder_object *fp;
1483                         struct binder_ref *ref;
1484
1485                         fp = to_flat_binder_object(hdr);
1486                         ref = binder_get_ref(proc, fp->handle,
1487                                              hdr->type == BINDER_TYPE_HANDLE);
1488                         if (ref == NULL) {
1489                                 pr_err("transaction release %d bad handle %d\n",
1490                                  debug_id, fp->handle);
1491                                 break;
1492                         }
1493                         binder_debug(BINDER_DEBUG_TRANSACTION,
1494                                      "        ref %d desc %d (node %d)\n",
1495                                      ref->debug_id, ref->desc, ref->node->debug_id);
1496                         binder_dec_ref(ref, hdr->type == BINDER_TYPE_HANDLE);
1497                 } break;
1498
1499                 case BINDER_TYPE_FD: {
1500                         struct binder_fd_object *fp = to_binder_fd_object(hdr);
1501
1502                         binder_debug(BINDER_DEBUG_TRANSACTION,
1503                                      "        fd %d\n", fp->fd);
1504                         if (failed_at)
1505                                 task_close_fd(proc, fp->fd);
1506                 } break;
1507                 case BINDER_TYPE_PTR:
1508                         /*
1509                          * Nothing to do here, this will get cleaned up when the
1510                          * transaction buffer gets freed
1511                          */
1512                         break;
1513                 case BINDER_TYPE_FDA: {
1514                         struct binder_fd_array_object *fda;
1515                         struct binder_buffer_object *parent;
1516                         uintptr_t parent_buffer;
1517                         u32 *fd_array;
1518                         size_t fd_index;
1519                         binder_size_t fd_buf_size;
1520
1521                         fda = to_binder_fd_array_object(hdr);
1522                         parent = binder_validate_ptr(buffer, fda->parent,
1523                                                      off_start,
1524                                                      offp - off_start);
1525                         if (!parent) {
1526                                 pr_err("transaction release %d bad parent offset",
1527                                        debug_id);
1528                                 continue;
1529                         }
1530                         /*
1531                          * Since the parent was already fixed up, convert it
1532                          * back to kernel address space to access it
1533                          */
1534                         parent_buffer = parent->buffer -
1535                                 proc->user_buffer_offset;
1536
1537                         fd_buf_size = sizeof(u32) * fda->num_fds;
1538                         if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
1539                                 pr_err("transaction release %d invalid number of fds (%lld)\n",
1540                                        debug_id, (u64)fda->num_fds);
1541                                 continue;
1542                         }
1543                         if (fd_buf_size > parent->length ||
1544                             fda->parent_offset > parent->length - fd_buf_size) {
1545                                 /* No space for all file descriptors here. */
1546                                 pr_err("transaction release %d not enough space for %lld fds in buffer\n",
1547                                        debug_id, (u64)fda->num_fds);
1548                                 continue;
1549                         }
1550                         fd_array = (u32 *)(parent_buffer + fda->parent_offset);
1551                         for (fd_index = 0; fd_index < fda->num_fds; fd_index++)
1552                                 task_close_fd(proc, fd_array[fd_index]);
1553                 } break;
1554                 default:
1555                         pr_err("transaction release %d bad object type %x\n",
1556                                 debug_id, hdr->type);
1557                         break;
1558                 }
1559         }
1560 }
1561
1562 static int binder_translate_binder(struct flat_binder_object *fp,
1563                                    struct binder_transaction *t,
1564                                    struct binder_thread *thread)
1565 {
1566         struct binder_node *node;
1567         struct binder_ref *ref;
1568         struct binder_proc *proc = thread->proc;
1569         struct binder_proc *target_proc = t->to_proc;
1570
1571         node = binder_get_node(proc, fp->binder);
1572         if (!node) {
1573                 node = binder_new_node(proc, fp->binder, fp->cookie);
1574                 if (!node)
1575                         return -ENOMEM;
1576
1577                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1578                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1579         }
1580         if (fp->cookie != node->cookie) {
1581                 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1582                                   proc->pid, thread->pid, (u64)fp->binder,
1583                                   node->debug_id, (u64)fp->cookie,
1584                                   (u64)node->cookie);
1585                 return -EINVAL;
1586         }
1587         if (security_binder_transfer_binder(proc->tsk, target_proc->tsk))
1588                 return -EPERM;
1589
1590         ref = binder_get_ref_for_node(target_proc, node);
1591         if (!ref)
1592                 return -EINVAL;
1593
1594         if (fp->hdr.type == BINDER_TYPE_BINDER)
1595                 fp->hdr.type = BINDER_TYPE_HANDLE;
1596         else
1597                 fp->hdr.type = BINDER_TYPE_WEAK_HANDLE;
1598         fp->binder = 0;
1599         fp->handle = ref->desc;
1600         fp->cookie = 0;
1601         binder_inc_ref(ref, fp->hdr.type == BINDER_TYPE_HANDLE, &thread->todo);
1602
1603         trace_binder_transaction_node_to_ref(t, node, ref);
1604         binder_debug(BINDER_DEBUG_TRANSACTION,
1605                      "        node %d u%016llx -> ref %d desc %d\n",
1606                      node->debug_id, (u64)node->ptr,
1607                      ref->debug_id, ref->desc);
1608
1609         return 0;
1610 }
1611
1612 static int binder_translate_handle(struct flat_binder_object *fp,
1613                                    struct binder_transaction *t,
1614                                    struct binder_thread *thread)
1615 {
1616         struct binder_ref *ref;
1617         struct binder_proc *proc = thread->proc;
1618         struct binder_proc *target_proc = t->to_proc;
1619
1620         ref = binder_get_ref(proc, fp->handle,
1621                              fp->hdr.type == BINDER_TYPE_HANDLE);
1622         if (!ref) {
1623                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1624                                   proc->pid, thread->pid, fp->handle);
1625                 return -EINVAL;
1626         }
1627         if (security_binder_transfer_binder(proc->tsk, target_proc->tsk))
1628                 return -EPERM;
1629
1630         if (ref->node->proc == target_proc) {
1631                 if (fp->hdr.type == BINDER_TYPE_HANDLE)
1632                         fp->hdr.type = BINDER_TYPE_BINDER;
1633                 else
1634                         fp->hdr.type = BINDER_TYPE_WEAK_BINDER;
1635                 fp->binder = ref->node->ptr;
1636                 fp->cookie = ref->node->cookie;
1637                 binder_inc_node(ref->node, fp->hdr.type == BINDER_TYPE_BINDER,
1638                                 0, NULL);
1639                 trace_binder_transaction_ref_to_node(t, ref);
1640                 binder_debug(BINDER_DEBUG_TRANSACTION,
1641                              "        ref %d desc %d -> node %d u%016llx\n",
1642                              ref->debug_id, ref->desc, ref->node->debug_id,
1643                              (u64)ref->node->ptr);
1644         } else {
1645                 struct binder_ref *new_ref;
1646
1647                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1648                 if (!new_ref)
1649                         return -EINVAL;
1650
1651                 fp->binder = 0;
1652                 fp->handle = new_ref->desc;
1653                 fp->cookie = 0;
1654                 binder_inc_ref(new_ref, fp->hdr.type == BINDER_TYPE_HANDLE,
1655                                NULL);
1656                 trace_binder_transaction_ref_to_ref(t, ref, new_ref);
1657                 binder_debug(BINDER_DEBUG_TRANSACTION,
1658                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1659                              ref->debug_id, ref->desc, new_ref->debug_id,
1660                              new_ref->desc, ref->node->debug_id);
1661         }
1662         return 0;
1663 }
1664
1665 static int binder_translate_fd(int fd,
1666                                struct binder_transaction *t,
1667                                struct binder_thread *thread,
1668                                struct binder_transaction *in_reply_to)
1669 {
1670         struct binder_proc *proc = thread->proc;
1671         struct binder_proc *target_proc = t->to_proc;
1672         int target_fd;
1673         struct file *file;
1674         int ret;
1675         bool target_allows_fd;
1676
1677         if (in_reply_to)
1678                 target_allows_fd = !!(in_reply_to->flags & TF_ACCEPT_FDS);
1679         else
1680                 target_allows_fd = t->buffer->target_node->accept_fds;
1681         if (!target_allows_fd) {
1682                 binder_user_error("%d:%d got %s with fd, %d, but target does not allow fds\n",
1683                                   proc->pid, thread->pid,
1684                                   in_reply_to ? "reply" : "transaction",
1685                                   fd);
1686                 ret = -EPERM;
1687                 goto err_fd_not_accepted;
1688         }
1689
1690         file = fget(fd);
1691         if (!file) {
1692                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1693                                   proc->pid, thread->pid, fd);
1694                 ret = -EBADF;
1695                 goto err_fget;
1696         }
1697         ret = security_binder_transfer_file(proc->tsk, target_proc->tsk, file);
1698         if (ret < 0) {
1699                 ret = -EPERM;
1700                 goto err_security;
1701         }
1702
1703         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1704         if (target_fd < 0) {
1705                 ret = -ENOMEM;
1706                 goto err_get_unused_fd;
1707         }
1708         task_fd_install(target_proc, target_fd, file);
1709         trace_binder_transaction_fd(t, fd, target_fd);
1710         binder_debug(BINDER_DEBUG_TRANSACTION, "        fd %d -> %d\n",
1711                      fd, target_fd);
1712
1713         return target_fd;
1714
1715 err_get_unused_fd:
1716 err_security:
1717         fput(file);
1718 err_fget:
1719 err_fd_not_accepted:
1720         return ret;
1721 }
1722
1723 static int binder_translate_fd_array(struct binder_fd_array_object *fda,
1724                                      struct binder_buffer_object *parent,
1725                                      struct binder_transaction *t,
1726                                      struct binder_thread *thread,
1727                                      struct binder_transaction *in_reply_to)
1728 {
1729         binder_size_t fdi, fd_buf_size, num_installed_fds;
1730         int target_fd;
1731         uintptr_t parent_buffer;
1732         u32 *fd_array;
1733         struct binder_proc *proc = thread->proc;
1734         struct binder_proc *target_proc = t->to_proc;
1735
1736         fd_buf_size = sizeof(u32) * fda->num_fds;
1737         if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
1738                 binder_user_error("%d:%d got transaction with invalid number of fds (%lld)\n",
1739                                   proc->pid, thread->pid, (u64)fda->num_fds);
1740                 return -EINVAL;
1741         }
1742         if (fd_buf_size > parent->length ||
1743             fda->parent_offset > parent->length - fd_buf_size) {
1744                 /* No space for all file descriptors here. */
1745                 binder_user_error("%d:%d not enough space to store %lld fds in buffer\n",
1746                                   proc->pid, thread->pid, (u64)fda->num_fds);
1747                 return -EINVAL;
1748         }
1749         /*
1750          * Since the parent was already fixed up, convert it
1751          * back to the kernel address space to access it
1752          */
1753         parent_buffer = parent->buffer - target_proc->user_buffer_offset;
1754         fd_array = (u32 *)(parent_buffer + fda->parent_offset);
1755         if (!IS_ALIGNED((unsigned long)fd_array, sizeof(u32))) {
1756                 binder_user_error("%d:%d parent offset not aligned correctly.\n",
1757                                   proc->pid, thread->pid);
1758                 return -EINVAL;
1759         }
1760         for (fdi = 0; fdi < fda->num_fds; fdi++) {
1761                 target_fd = binder_translate_fd(fd_array[fdi], t, thread,
1762                                                 in_reply_to);
1763                 if (target_fd < 0)
1764                         goto err_translate_fd_failed;
1765                 fd_array[fdi] = target_fd;
1766         }
1767         return 0;
1768
1769 err_translate_fd_failed:
1770         /*
1771          * Failed to allocate fd or security error, free fds
1772          * installed so far.
1773          */
1774         num_installed_fds = fdi;
1775         for (fdi = 0; fdi < num_installed_fds; fdi++)
1776                 task_close_fd(target_proc, fd_array[fdi]);
1777         return target_fd;
1778 }
1779
1780 static int binder_fixup_parent(struct binder_transaction *t,
1781                                struct binder_thread *thread,
1782                                struct binder_buffer_object *bp,
1783                                binder_size_t *off_start,
1784                                binder_size_t num_valid,
1785                                struct binder_buffer_object *last_fixup_obj,
1786                                binder_size_t last_fixup_min_off)
1787 {
1788         struct binder_buffer_object *parent;
1789         u8 *parent_buffer;
1790         struct binder_buffer *b = t->buffer;
1791         struct binder_proc *proc = thread->proc;
1792         struct binder_proc *target_proc = t->to_proc;
1793
1794         if (!(bp->flags & BINDER_BUFFER_FLAG_HAS_PARENT))
1795                 return 0;
1796
1797         parent = binder_validate_ptr(b, bp->parent, off_start, num_valid);
1798         if (!parent) {
1799                 binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
1800                                   proc->pid, thread->pid);
1801                 return -EINVAL;
1802         }
1803
1804         if (!binder_validate_fixup(b, off_start,
1805                                    parent, bp->parent_offset,
1806                                    last_fixup_obj,
1807                                    last_fixup_min_off)) {
1808                 binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
1809                                   proc->pid, thread->pid);
1810                 return -EINVAL;
1811         }
1812
1813         if (parent->length < sizeof(binder_uintptr_t) ||
1814             bp->parent_offset > parent->length - sizeof(binder_uintptr_t)) {
1815                 /* No space for a pointer here! */
1816                 binder_user_error("%d:%d got transaction with invalid parent offset\n",
1817                                   proc->pid, thread->pid);
1818                 return -EINVAL;
1819         }
1820         parent_buffer = (u8 *)(parent->buffer -
1821                                target_proc->user_buffer_offset);
1822         *(binder_uintptr_t *)(parent_buffer + bp->parent_offset) = bp->buffer;
1823
1824         return 0;
1825 }
1826
1827 static void binder_transaction(struct binder_proc *proc,
1828                                struct binder_thread *thread,
1829                                struct binder_transaction_data *tr, int reply,
1830                                binder_size_t extra_buffers_size)
1831 {
1832         int ret;
1833         struct binder_transaction *t;
1834         struct binder_work *tcomplete;
1835         binder_size_t *offp, *off_end, *off_start;
1836         binder_size_t off_min;
1837         u8 *sg_bufp, *sg_buf_end;
1838         struct binder_proc *target_proc;
1839         struct binder_thread *target_thread = NULL;
1840         struct binder_node *target_node = NULL;
1841         struct list_head *target_list;
1842         wait_queue_head_t *target_wait;
1843         struct binder_transaction *in_reply_to = NULL;
1844         struct binder_transaction_log_entry *e;
1845         uint32_t return_error;
1846         struct binder_buffer_object *last_fixup_obj = NULL;
1847         binder_size_t last_fixup_min_off = 0;
1848         struct binder_context *context = proc->context;
1849
1850         e = binder_transaction_log_add(&binder_transaction_log);
1851         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1852         e->from_proc = proc->pid;
1853         e->from_thread = thread->pid;
1854         e->target_handle = tr->target.handle;
1855         e->data_size = tr->data_size;
1856         e->offsets_size = tr->offsets_size;
1857         e->context_name = proc->context->name;
1858
1859         if (reply) {
1860                 in_reply_to = thread->transaction_stack;
1861                 if (in_reply_to == NULL) {
1862                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1863                                           proc->pid, thread->pid);
1864                         return_error = BR_FAILED_REPLY;
1865                         goto err_empty_call_stack;
1866                 }
1867                 binder_set_nice(in_reply_to->saved_priority);
1868                 if (in_reply_to->to_thread != thread) {
1869                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1870                                 proc->pid, thread->pid, in_reply_to->debug_id,
1871                                 in_reply_to->to_proc ?
1872                                 in_reply_to->to_proc->pid : 0,
1873                                 in_reply_to->to_thread ?
1874                                 in_reply_to->to_thread->pid : 0);
1875                         return_error = BR_FAILED_REPLY;
1876                         in_reply_to = NULL;
1877                         goto err_bad_call_stack;
1878                 }
1879                 thread->transaction_stack = in_reply_to->to_parent;
1880                 target_thread = in_reply_to->from;
1881                 if (target_thread == NULL) {
1882                         return_error = BR_DEAD_REPLY;
1883                         goto err_dead_binder;
1884                 }
1885                 if (target_thread->transaction_stack != in_reply_to) {
1886                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1887                                 proc->pid, thread->pid,
1888                                 target_thread->transaction_stack ?
1889                                 target_thread->transaction_stack->debug_id : 0,
1890                                 in_reply_to->debug_id);
1891                         return_error = BR_FAILED_REPLY;
1892                         in_reply_to = NULL;
1893                         target_thread = NULL;
1894                         goto err_dead_binder;
1895                 }
1896                 target_proc = target_thread->proc;
1897         } else {
1898                 if (tr->target.handle) {
1899                         struct binder_ref *ref;
1900
1901                         ref = binder_get_ref(proc, tr->target.handle, true);
1902                         if (ref == NULL) {
1903                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1904                                         proc->pid, thread->pid);
1905                                 return_error = BR_FAILED_REPLY;
1906                                 goto err_invalid_target_handle;
1907                         }
1908                         target_node = ref->node;
1909                 } else {
1910                         target_node = context->binder_context_mgr_node;
1911                         if (target_node == NULL) {
1912                                 return_error = BR_DEAD_REPLY;
1913                                 goto err_no_context_mgr_node;
1914                         }
1915                 }
1916                 e->to_node = target_node->debug_id;
1917                 target_proc = target_node->proc;
1918                 if (target_proc == NULL) {
1919                         return_error = BR_DEAD_REPLY;
1920                         goto err_dead_binder;
1921                 }
1922                 if (security_binder_transaction(proc->tsk,
1923                                                 target_proc->tsk) < 0) {
1924                         return_error = BR_FAILED_REPLY;
1925                         goto err_invalid_target_handle;
1926                 }
1927                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1928                         struct binder_transaction *tmp;
1929
1930                         tmp = thread->transaction_stack;
1931                         if (tmp->to_thread != thread) {
1932                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1933                                         proc->pid, thread->pid, tmp->debug_id,
1934                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1935                                         tmp->to_thread ?
1936                                         tmp->to_thread->pid : 0);
1937                                 return_error = BR_FAILED_REPLY;
1938                                 goto err_bad_call_stack;
1939                         }
1940                         while (tmp) {
1941                                 if (tmp->from && tmp->from->proc == target_proc)
1942                                         target_thread = tmp->from;
1943                                 tmp = tmp->from_parent;
1944                         }
1945                 }
1946         }
1947         if (target_thread) {
1948                 e->to_thread = target_thread->pid;
1949                 target_list = &target_thread->todo;
1950                 target_wait = &target_thread->wait;
1951         } else {
1952                 target_list = &target_proc->todo;
1953                 target_wait = &target_proc->wait;
1954         }
1955         e->to_proc = target_proc->pid;
1956
1957         /* TODO: reuse incoming transaction for reply */
1958         t = kzalloc(sizeof(*t), GFP_KERNEL);
1959         if (t == NULL) {
1960                 return_error = BR_FAILED_REPLY;
1961                 goto err_alloc_t_failed;
1962         }
1963         binder_stats_created(BINDER_STAT_TRANSACTION);
1964
1965         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1966         if (tcomplete == NULL) {
1967                 return_error = BR_FAILED_REPLY;
1968                 goto err_alloc_tcomplete_failed;
1969         }
1970         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1971
1972         t->debug_id = ++binder_last_id;
1973         e->debug_id = t->debug_id;
1974
1975         if (reply)
1976                 binder_debug(BINDER_DEBUG_TRANSACTION,
1977                              "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld-%lld\n",
1978                              proc->pid, thread->pid, t->debug_id,
1979                              target_proc->pid, target_thread->pid,
1980                              (u64)tr->data.ptr.buffer,
1981                              (u64)tr->data.ptr.offsets,
1982                              (u64)tr->data_size, (u64)tr->offsets_size,
1983                              (u64)extra_buffers_size);
1984         else
1985                 binder_debug(BINDER_DEBUG_TRANSACTION,
1986                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld-%lld\n",
1987                              proc->pid, thread->pid, t->debug_id,
1988                              target_proc->pid, target_node->debug_id,
1989                              (u64)tr->data.ptr.buffer,
1990                              (u64)tr->data.ptr.offsets,
1991                              (u64)tr->data_size, (u64)tr->offsets_size,
1992                              (u64)extra_buffers_size);
1993
1994         if (!reply && !(tr->flags & TF_ONE_WAY))
1995                 t->from = thread;
1996         else
1997                 t->from = NULL;
1998         t->sender_euid = task_euid(proc->tsk);
1999         t->to_proc = target_proc;
2000         t->to_thread = target_thread;
2001         t->code = tr->code;
2002         t->flags = tr->flags;
2003         t->priority = task_nice(current);
2004
2005         trace_binder_transaction(reply, t, target_node);
2006
2007         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
2008                 tr->offsets_size, extra_buffers_size,
2009                 !reply && (t->flags & TF_ONE_WAY));
2010         if (t->buffer == NULL) {
2011                 return_error = BR_FAILED_REPLY;
2012                 goto err_binder_alloc_buf_failed;
2013         }
2014         t->buffer->allow_user_free = 0;
2015         t->buffer->debug_id = t->debug_id;
2016         t->buffer->transaction = t;
2017         t->buffer->target_node = target_node;
2018         trace_binder_transaction_alloc_buf(t->buffer);
2019         if (target_node)
2020                 binder_inc_node(target_node, 1, 0, NULL);
2021
2022         off_start = (binder_size_t *)(t->buffer->data +
2023                                       ALIGN(tr->data_size, sizeof(void *)));
2024         offp = off_start;
2025
2026         if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
2027                            tr->data.ptr.buffer, tr->data_size)) {
2028                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
2029                                 proc->pid, thread->pid);
2030                 return_error = BR_FAILED_REPLY;
2031                 goto err_copy_data_failed;
2032         }
2033         if (copy_from_user(offp, (const void __user *)(uintptr_t)
2034                            tr->data.ptr.offsets, tr->offsets_size)) {
2035                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
2036                                 proc->pid, thread->pid);
2037                 return_error = BR_FAILED_REPLY;
2038                 goto err_copy_data_failed;
2039         }
2040         if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
2041                 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
2042                                 proc->pid, thread->pid, (u64)tr->offsets_size);
2043                 return_error = BR_FAILED_REPLY;
2044                 goto err_bad_offset;
2045         }
2046         if (!IS_ALIGNED(extra_buffers_size, sizeof(u64))) {
2047                 binder_user_error("%d:%d got transaction with unaligned buffers size, %lld\n",
2048                                   proc->pid, thread->pid,
2049                                   (u64)extra_buffers_size);
2050                 return_error = BR_FAILED_REPLY;
2051                 goto err_bad_offset;
2052         }
2053         off_end = (void *)off_start + tr->offsets_size;
2054         sg_bufp = (u8 *)(PTR_ALIGN(off_end, sizeof(void *)));
2055         sg_buf_end = sg_bufp + extra_buffers_size;
2056         off_min = 0;
2057         for (; offp < off_end; offp++) {
2058                 struct binder_object_header *hdr;
2059                 size_t object_size = binder_validate_object(t->buffer, *offp);
2060
2061                 if (object_size == 0 || *offp < off_min) {
2062                         binder_user_error("%d:%d got transaction with invalid offset (%lld, min %lld max %lld) or object.\n",
2063                                           proc->pid, thread->pid, (u64)*offp,
2064                                           (u64)off_min,
2065                                           (u64)t->buffer->data_size);
2066                         return_error = BR_FAILED_REPLY;
2067                         goto err_bad_offset;
2068                 }
2069
2070                 hdr = (struct binder_object_header *)(t->buffer->data + *offp);
2071                 off_min = *offp + object_size;
2072                 switch (hdr->type) {
2073                 case BINDER_TYPE_BINDER:
2074                 case BINDER_TYPE_WEAK_BINDER: {
2075                         struct flat_binder_object *fp;
2076
2077                         fp = to_flat_binder_object(hdr);
2078                         ret = binder_translate_binder(fp, t, thread);
2079                         if (ret < 0) {
2080                                 return_error = BR_FAILED_REPLY;
2081                                 goto err_translate_failed;
2082                         }
2083                 } break;
2084                 case BINDER_TYPE_HANDLE:
2085                 case BINDER_TYPE_WEAK_HANDLE: {
2086                         struct flat_binder_object *fp;
2087
2088                         fp = to_flat_binder_object(hdr);
2089                         ret = binder_translate_handle(fp, t, thread);
2090                         if (ret < 0) {
2091                                 return_error = BR_FAILED_REPLY;
2092                                 goto err_translate_failed;
2093                         }
2094                 } break;
2095
2096                 case BINDER_TYPE_FD: {
2097                         struct binder_fd_object *fp = to_binder_fd_object(hdr);
2098                         int target_fd = binder_translate_fd(fp->fd, t, thread,
2099                                                             in_reply_to);
2100
2101                         if (target_fd < 0) {
2102                                 return_error = BR_FAILED_REPLY;
2103                                 goto err_translate_failed;
2104                         }
2105                         fp->pad_binder = 0;
2106                         fp->fd = target_fd;
2107                 } break;
2108                 case BINDER_TYPE_FDA: {
2109                         struct binder_fd_array_object *fda =
2110                                 to_binder_fd_array_object(hdr);
2111                         struct binder_buffer_object *parent =
2112                                 binder_validate_ptr(t->buffer, fda->parent,
2113                                                     off_start,
2114                                                     offp - off_start);
2115                         if (!parent) {
2116                                 binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
2117                                                   proc->pid, thread->pid);
2118                                 return_error = BR_FAILED_REPLY;
2119                                 goto err_bad_parent;
2120                         }
2121                         if (!binder_validate_fixup(t->buffer, off_start,
2122                                                    parent, fda->parent_offset,
2123                                                    last_fixup_obj,
2124                                                    last_fixup_min_off)) {
2125                                 binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
2126                                                   proc->pid, thread->pid);
2127                                 return_error = BR_FAILED_REPLY;
2128                                 goto err_bad_parent;
2129                         }
2130                         ret = binder_translate_fd_array(fda, parent, t, thread,
2131                                                         in_reply_to);
2132                         if (ret < 0) {
2133                                 return_error = BR_FAILED_REPLY;
2134                                 goto err_translate_failed;
2135                         }
2136                         last_fixup_obj = parent;
2137                         last_fixup_min_off =
2138                                 fda->parent_offset + sizeof(u32) * fda->num_fds;
2139                 } break;
2140                 case BINDER_TYPE_PTR: {
2141                         struct binder_buffer_object *bp =
2142                                 to_binder_buffer_object(hdr);
2143                         size_t buf_left = sg_buf_end - sg_bufp;
2144
2145                         if (bp->length > buf_left) {
2146                                 binder_user_error("%d:%d got transaction with too large buffer\n",
2147                                                   proc->pid, thread->pid);
2148                                 return_error = BR_FAILED_REPLY;
2149                                 goto err_bad_offset;
2150                         }
2151                         if (copy_from_user(sg_bufp,
2152                                            (const void __user *)(uintptr_t)
2153                                            bp->buffer, bp->length)) {
2154                                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
2155                                                   proc->pid, thread->pid);
2156                                 return_error = BR_FAILED_REPLY;
2157                                 goto err_copy_data_failed;
2158                         }
2159                         /* Fixup buffer pointer to target proc address space */
2160                         bp->buffer = (uintptr_t)sg_bufp +
2161                                 target_proc->user_buffer_offset;
2162                         sg_bufp += ALIGN(bp->length, sizeof(u64));
2163
2164                         ret = binder_fixup_parent(t, thread, bp, off_start,
2165                                                   offp - off_start,
2166                                                   last_fixup_obj,
2167                                                   last_fixup_min_off);
2168                         if (ret < 0) {
2169                                 return_error = BR_FAILED_REPLY;
2170                                 goto err_translate_failed;
2171                         }
2172                         last_fixup_obj = bp;
2173                         last_fixup_min_off = 0;
2174                 } break;
2175                 default:
2176                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
2177                                 proc->pid, thread->pid, hdr->type);
2178                         return_error = BR_FAILED_REPLY;
2179                         goto err_bad_object_type;
2180                 }
2181         }
2182         if (reply) {
2183                 BUG_ON(t->buffer->async_transaction != 0);
2184                 binder_pop_transaction(target_thread, in_reply_to);
2185         } else if (!(t->flags & TF_ONE_WAY)) {
2186                 BUG_ON(t->buffer->async_transaction != 0);
2187                 t->need_reply = 1;
2188                 t->from_parent = thread->transaction_stack;
2189                 thread->transaction_stack = t;
2190         } else {
2191                 BUG_ON(target_node == NULL);
2192                 BUG_ON(t->buffer->async_transaction != 1);
2193                 if (target_node->has_async_transaction) {
2194                         target_list = &target_node->async_todo;
2195                         target_wait = NULL;
2196                 } else
2197                         target_node->has_async_transaction = 1;
2198         }
2199         t->work.type = BINDER_WORK_TRANSACTION;
2200         list_add_tail(&t->work.entry, target_list);
2201         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
2202         list_add_tail(&tcomplete->entry, &thread->todo);
2203         if (target_wait) {
2204                 if (reply || !(t->flags & TF_ONE_WAY))
2205                         wake_up_interruptible_sync(target_wait);
2206                 else
2207                         wake_up_interruptible(target_wait);
2208         }
2209         return;
2210
2211 err_translate_failed:
2212 err_bad_object_type:
2213 err_bad_offset:
2214 err_bad_parent:
2215 err_copy_data_failed:
2216         trace_binder_transaction_failed_buffer_release(t->buffer);
2217         binder_transaction_buffer_release(target_proc, t->buffer, offp);
2218         t->buffer->transaction = NULL;
2219         binder_free_buf(target_proc, t->buffer);
2220 err_binder_alloc_buf_failed:
2221         kfree(tcomplete);
2222         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2223 err_alloc_tcomplete_failed:
2224         kfree(t);
2225         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2226 err_alloc_t_failed:
2227 err_bad_call_stack:
2228 err_empty_call_stack:
2229 err_dead_binder:
2230 err_invalid_target_handle:
2231 err_no_context_mgr_node:
2232         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2233                      "%d:%d transaction failed %d, size %lld-%lld\n",
2234                      proc->pid, thread->pid, return_error,
2235                      (u64)tr->data_size, (u64)tr->offsets_size);
2236
2237         {
2238                 struct binder_transaction_log_entry *fe;
2239
2240                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
2241                 *fe = *e;
2242         }
2243
2244         BUG_ON(thread->return_error != BR_OK);
2245         if (in_reply_to) {
2246                 thread->return_error = BR_TRANSACTION_COMPLETE;
2247                 binder_send_failed_reply(in_reply_to, return_error);
2248         } else
2249                 thread->return_error = return_error;
2250 }
2251
2252 static int binder_thread_write(struct binder_proc *proc,
2253                         struct binder_thread *thread,
2254                         binder_uintptr_t binder_buffer, size_t size,
2255                         binder_size_t *consumed)
2256 {
2257         uint32_t cmd;
2258         struct binder_context *context = proc->context;
2259         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2260         void __user *ptr = buffer + *consumed;
2261         void __user *end = buffer + size;
2262
2263         while (ptr < end && thread->return_error == BR_OK) {
2264                 if (get_user(cmd, (uint32_t __user *)ptr))
2265                         return -EFAULT;
2266                 ptr += sizeof(uint32_t);
2267                 trace_binder_command(cmd);
2268                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
2269                         binder_stats.bc[_IOC_NR(cmd)]++;
2270                         proc->stats.bc[_IOC_NR(cmd)]++;
2271                         thread->stats.bc[_IOC_NR(cmd)]++;
2272                 }
2273                 switch (cmd) {
2274                 case BC_INCREFS:
2275                 case BC_ACQUIRE:
2276                 case BC_RELEASE:
2277                 case BC_DECREFS: {
2278                         uint32_t target;
2279                         struct binder_ref *ref;
2280                         const char *debug_string;
2281
2282                         if (get_user(target, (uint32_t __user *)ptr))
2283                                 return -EFAULT;
2284                         ptr += sizeof(uint32_t);
2285                         if (target == 0 && context->binder_context_mgr_node &&
2286                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
2287                                 ref = binder_get_ref_for_node(proc,
2288                                         context->binder_context_mgr_node);
2289                                 if (ref->desc != target) {
2290                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
2291                                                 proc->pid, thread->pid,
2292                                                 ref->desc);
2293                                 }
2294                         } else
2295                                 ref = binder_get_ref(proc, target,
2296                                                      cmd == BC_ACQUIRE ||
2297                                                      cmd == BC_RELEASE);
2298                         if (ref == NULL) {
2299                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
2300                                         proc->pid, thread->pid, target);
2301                                 break;
2302                         }
2303                         switch (cmd) {
2304                         case BC_INCREFS:
2305                                 debug_string = "IncRefs";
2306                                 binder_inc_ref(ref, 0, NULL);
2307                                 break;
2308                         case BC_ACQUIRE:
2309                                 debug_string = "Acquire";
2310                                 binder_inc_ref(ref, 1, NULL);
2311                                 break;
2312                         case BC_RELEASE:
2313                                 debug_string = "Release";
2314                                 binder_dec_ref(ref, 1);
2315                                 break;
2316                         case BC_DECREFS:
2317                         default:
2318                                 debug_string = "DecRefs";
2319                                 binder_dec_ref(ref, 0);
2320                                 break;
2321                         }
2322                         binder_debug(BINDER_DEBUG_USER_REFS,
2323                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
2324                                      proc->pid, thread->pid, debug_string, ref->debug_id,
2325                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
2326                         break;
2327                 }
2328                 case BC_INCREFS_DONE:
2329                 case BC_ACQUIRE_DONE: {
2330                         binder_uintptr_t node_ptr;
2331                         binder_uintptr_t cookie;
2332                         struct binder_node *node;
2333
2334                         if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
2335                                 return -EFAULT;
2336                         ptr += sizeof(binder_uintptr_t);
2337                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2338                                 return -EFAULT;
2339                         ptr += sizeof(binder_uintptr_t);
2340                         node = binder_get_node(proc, node_ptr);
2341                         if (node == NULL) {
2342                                 binder_user_error("%d:%d %s u%016llx no match\n",
2343                                         proc->pid, thread->pid,
2344                                         cmd == BC_INCREFS_DONE ?
2345                                         "BC_INCREFS_DONE" :
2346                                         "BC_ACQUIRE_DONE",
2347                                         (u64)node_ptr);
2348                                 break;
2349                         }
2350                         if (cookie != node->cookie) {
2351                                 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
2352                                         proc->pid, thread->pid,
2353                                         cmd == BC_INCREFS_DONE ?
2354                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
2355                                         (u64)node_ptr, node->debug_id,
2356                                         (u64)cookie, (u64)node->cookie);
2357                                 break;
2358                         }
2359                         if (cmd == BC_ACQUIRE_DONE) {
2360                                 if (node->pending_strong_ref == 0) {
2361                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
2362                                                 proc->pid, thread->pid,
2363                                                 node->debug_id);
2364                                         break;
2365                                 }
2366                                 node->pending_strong_ref = 0;
2367                         } else {
2368                                 if (node->pending_weak_ref == 0) {
2369                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
2370                                                 proc->pid, thread->pid,
2371                                                 node->debug_id);
2372                                         break;
2373                                 }
2374                                 node->pending_weak_ref = 0;
2375                         }
2376                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
2377                         binder_debug(BINDER_DEBUG_USER_REFS,
2378                                      "%d:%d %s node %d ls %d lw %d\n",
2379                                      proc->pid, thread->pid,
2380                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
2381                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
2382                         break;
2383                 }
2384                 case BC_ATTEMPT_ACQUIRE:
2385                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
2386                         return -EINVAL;
2387                 case BC_ACQUIRE_RESULT:
2388                         pr_err("BC_ACQUIRE_RESULT not supported\n");
2389                         return -EINVAL;
2390
2391                 case BC_FREE_BUFFER: {
2392                         binder_uintptr_t data_ptr;
2393                         struct binder_buffer *buffer;
2394
2395                         if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
2396                                 return -EFAULT;
2397                         ptr += sizeof(binder_uintptr_t);
2398
2399                         buffer = binder_buffer_lookup(proc, data_ptr);
2400                         if (buffer == NULL) {
2401                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
2402                                         proc->pid, thread->pid, (u64)data_ptr);
2403                                 break;
2404                         }
2405                         if (!buffer->allow_user_free) {
2406                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
2407                                         proc->pid, thread->pid, (u64)data_ptr);
2408                                 break;
2409                         }
2410                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
2411                                      "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
2412                                      proc->pid, thread->pid, (u64)data_ptr,
2413                                      buffer->debug_id,
2414                                      buffer->transaction ? "active" : "finished");
2415
2416                         if (buffer->transaction) {
2417                                 buffer->transaction->buffer = NULL;
2418                                 buffer->transaction = NULL;
2419                         }
2420                         if (buffer->async_transaction && buffer->target_node) {
2421                                 BUG_ON(!buffer->target_node->has_async_transaction);
2422                                 if (list_empty(&buffer->target_node->async_todo))
2423                                         buffer->target_node->has_async_transaction = 0;
2424                                 else
2425                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
2426                         }
2427                         trace_binder_transaction_buffer_release(buffer);
2428                         binder_transaction_buffer_release(proc, buffer, NULL);
2429                         binder_free_buf(proc, buffer);
2430                         break;
2431                 }
2432
2433                 case BC_TRANSACTION_SG:
2434                 case BC_REPLY_SG: {
2435                         struct binder_transaction_data_sg tr;
2436
2437                         if (copy_from_user(&tr, ptr, sizeof(tr)))
2438                                 return -EFAULT;
2439                         ptr += sizeof(tr);
2440                         binder_transaction(proc, thread, &tr.transaction_data,
2441                                            cmd == BC_REPLY_SG, tr.buffers_size);
2442                         break;
2443                 }
2444                 case BC_TRANSACTION:
2445                 case BC_REPLY: {
2446                         struct binder_transaction_data tr;
2447
2448                         if (copy_from_user(&tr, ptr, sizeof(tr)))
2449                                 return -EFAULT;
2450                         ptr += sizeof(tr);
2451                         binder_transaction(proc, thread, &tr,
2452                                            cmd == BC_REPLY, 0);
2453                         break;
2454                 }
2455
2456                 case BC_REGISTER_LOOPER:
2457                         binder_debug(BINDER_DEBUG_THREADS,
2458                                      "%d:%d BC_REGISTER_LOOPER\n",
2459                                      proc->pid, thread->pid);
2460                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
2461                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2462                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
2463                                         proc->pid, thread->pid);
2464                         } else if (proc->requested_threads == 0) {
2465                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2466                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
2467                                         proc->pid, thread->pid);
2468                         } else {
2469                                 proc->requested_threads--;
2470                                 proc->requested_threads_started++;
2471                         }
2472                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
2473                         break;
2474                 case BC_ENTER_LOOPER:
2475                         binder_debug(BINDER_DEBUG_THREADS,
2476                                      "%d:%d BC_ENTER_LOOPER\n",
2477                                      proc->pid, thread->pid);
2478                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
2479                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2480                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
2481                                         proc->pid, thread->pid);
2482                         }
2483                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
2484                         break;
2485                 case BC_EXIT_LOOPER:
2486                         binder_debug(BINDER_DEBUG_THREADS,
2487                                      "%d:%d BC_EXIT_LOOPER\n",
2488                                      proc->pid, thread->pid);
2489                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
2490                         break;
2491
2492                 case BC_REQUEST_DEATH_NOTIFICATION:
2493                 case BC_CLEAR_DEATH_NOTIFICATION: {
2494                         uint32_t target;
2495                         binder_uintptr_t cookie;
2496                         struct binder_ref *ref;
2497                         struct binder_ref_death *death;
2498
2499                         if (get_user(target, (uint32_t __user *)ptr))
2500                                 return -EFAULT;
2501                         ptr += sizeof(uint32_t);
2502                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2503                                 return -EFAULT;
2504                         ptr += sizeof(binder_uintptr_t);
2505                         ref = binder_get_ref(proc, target, false);
2506                         if (ref == NULL) {
2507                                 binder_user_error("%d:%d %s invalid ref %d\n",
2508                                         proc->pid, thread->pid,
2509                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2510                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2511                                         "BC_CLEAR_DEATH_NOTIFICATION",
2512                                         target);
2513                                 break;
2514                         }
2515
2516                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2517                                      "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2518                                      proc->pid, thread->pid,
2519                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2520                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2521                                      "BC_CLEAR_DEATH_NOTIFICATION",
2522                                      (u64)cookie, ref->debug_id, ref->desc,
2523                                      ref->strong, ref->weak, ref->node->debug_id);
2524
2525                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2526                                 if (ref->death) {
2527                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2528                                                 proc->pid, thread->pid);
2529                                         break;
2530                                 }
2531                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2532                                 if (death == NULL) {
2533                                         thread->return_error = BR_ERROR;
2534                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2535                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2536                                                      proc->pid, thread->pid);
2537                                         break;
2538                                 }
2539                                 binder_stats_created(BINDER_STAT_DEATH);
2540                                 INIT_LIST_HEAD(&death->work.entry);
2541                                 death->cookie = cookie;
2542                                 ref->death = death;
2543                                 if (ref->node->proc == NULL) {
2544                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2545                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2546                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2547                                         } else {
2548                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2549                                                 wake_up_interruptible(&proc->wait);
2550                                         }
2551                                 }
2552                         } else {
2553                                 if (ref->death == NULL) {
2554                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2555                                                 proc->pid, thread->pid);
2556                                         break;
2557                                 }
2558                                 death = ref->death;
2559                                 if (death->cookie != cookie) {
2560                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2561                                                 proc->pid, thread->pid,
2562                                                 (u64)death->cookie,
2563                                                 (u64)cookie);
2564                                         break;
2565                                 }
2566                                 ref->death = NULL;
2567                                 if (list_empty(&death->work.entry)) {
2568                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2569                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2570                                                 list_add_tail(&death->work.entry, &thread->todo);
2571                                         } else {
2572                                                 list_add_tail(&death->work.entry, &proc->todo);
2573                                                 wake_up_interruptible(&proc->wait);
2574                                         }
2575                                 } else {
2576                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2577                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2578                                 }
2579                         }
2580                 } break;
2581                 case BC_DEAD_BINDER_DONE: {
2582                         struct binder_work *w;
2583                         binder_uintptr_t cookie;
2584                         struct binder_ref_death *death = NULL;
2585
2586                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2587                                 return -EFAULT;
2588
2589                         ptr += sizeof(cookie);
2590                         list_for_each_entry(w, &proc->delivered_death, entry) {
2591                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2592
2593                                 if (tmp_death->cookie == cookie) {
2594                                         death = tmp_death;
2595                                         break;
2596                                 }
2597                         }
2598                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2599                                      "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2600                                      proc->pid, thread->pid, (u64)cookie,
2601                                      death);
2602                         if (death == NULL) {
2603                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2604                                         proc->pid, thread->pid, (u64)cookie);
2605                                 break;
2606                         }
2607
2608                         list_del_init(&death->work.entry);
2609                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2610                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2611                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2612                                         list_add_tail(&death->work.entry, &thread->todo);
2613                                 } else {
2614                                         list_add_tail(&death->work.entry, &proc->todo);
2615                                         wake_up_interruptible(&proc->wait);
2616                                 }
2617                         }
2618                 } break;
2619
2620                 default:
2621                         pr_err("%d:%d unknown command %d\n",
2622                                proc->pid, thread->pid, cmd);
2623                         return -EINVAL;
2624                 }
2625                 *consumed = ptr - buffer;
2626         }
2627         return 0;
2628 }
2629
2630 static void binder_stat_br(struct binder_proc *proc,
2631                            struct binder_thread *thread, uint32_t cmd)
2632 {
2633         trace_binder_return(cmd);
2634         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2635                 binder_stats.br[_IOC_NR(cmd)]++;
2636                 proc->stats.br[_IOC_NR(cmd)]++;
2637                 thread->stats.br[_IOC_NR(cmd)]++;
2638         }
2639 }
2640
2641 static int binder_has_proc_work(struct binder_proc *proc,
2642                                 struct binder_thread *thread)
2643 {
2644         return !list_empty(&proc->todo) ||
2645                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2646 }
2647
2648 static int binder_has_thread_work(struct binder_thread *thread)
2649 {
2650         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2651                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2652 }
2653
2654 static int binder_thread_read(struct binder_proc *proc,
2655                               struct binder_thread *thread,
2656                               binder_uintptr_t binder_buffer, size_t size,
2657                               binder_size_t *consumed, int non_block)
2658 {
2659         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2660         void __user *ptr = buffer + *consumed;
2661         void __user *end = buffer + size;
2662
2663         int ret = 0;
2664         int wait_for_proc_work;
2665
2666         if (*consumed == 0) {
2667                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2668                         return -EFAULT;
2669                 ptr += sizeof(uint32_t);
2670         }
2671
2672 retry:
2673         wait_for_proc_work = thread->transaction_stack == NULL &&
2674                                 list_empty(&thread->todo);
2675
2676         if (thread->return_error != BR_OK && ptr < end) {
2677                 if (thread->return_error2 != BR_OK) {
2678                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2679                                 return -EFAULT;
2680                         ptr += sizeof(uint32_t);
2681                         binder_stat_br(proc, thread, thread->return_error2);
2682                         if (ptr == end)
2683                                 goto done;
2684                         thread->return_error2 = BR_OK;
2685                 }
2686                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2687                         return -EFAULT;
2688                 ptr += sizeof(uint32_t);
2689                 binder_stat_br(proc, thread, thread->return_error);
2690                 thread->return_error = BR_OK;
2691                 goto done;
2692         }
2693
2694
2695         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2696         if (wait_for_proc_work)
2697                 proc->ready_threads++;
2698
2699         binder_unlock(__func__);
2700
2701         trace_binder_wait_for_work(wait_for_proc_work,
2702                                    !!thread->transaction_stack,
2703                                    !list_empty(&thread->todo));
2704         if (wait_for_proc_work) {
2705                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2706                                         BINDER_LOOPER_STATE_ENTERED))) {
2707                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2708                                 proc->pid, thread->pid, thread->looper);
2709                         wait_event_interruptible(binder_user_error_wait,
2710                                                  binder_stop_on_user_error < 2);
2711                 }
2712                 binder_set_nice(proc->default_priority);
2713                 if (non_block) {
2714                         if (!binder_has_proc_work(proc, thread))
2715                                 ret = -EAGAIN;
2716                 } else
2717                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2718         } else {
2719                 if (non_block) {
2720                         if (!binder_has_thread_work(thread))
2721                                 ret = -EAGAIN;
2722                 } else
2723                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2724         }
2725
2726         binder_lock(__func__);
2727
2728         if (wait_for_proc_work)
2729                 proc->ready_threads--;
2730         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2731
2732         if (ret)
2733                 return ret;
2734
2735         while (1) {
2736                 uint32_t cmd;
2737                 struct binder_transaction_data tr;
2738                 struct binder_work *w;
2739                 struct binder_transaction *t = NULL;
2740
2741                 if (!list_empty(&thread->todo)) {
2742                         w = list_first_entry(&thread->todo, struct binder_work,
2743                                              entry);
2744                 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2745                         w = list_first_entry(&proc->todo, struct binder_work,
2746                                              entry);
2747                 } else {
2748                         /* no data added */
2749                         if (ptr - buffer == 4 &&
2750                             !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2751                                 goto retry;
2752                         break;
2753                 }
2754
2755                 if (end - ptr < sizeof(tr) + 4)
2756                         break;
2757
2758                 switch (w->type) {
2759                 case BINDER_WORK_TRANSACTION: {
2760                         t = container_of(w, struct binder_transaction, work);
2761                 } break;
2762                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2763                         cmd = BR_TRANSACTION_COMPLETE;
2764                         if (put_user(cmd, (uint32_t __user *)ptr))
2765                                 return -EFAULT;
2766                         ptr += sizeof(uint32_t);
2767
2768                         binder_stat_br(proc, thread, cmd);
2769                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2770                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2771                                      proc->pid, thread->pid);
2772
2773                         list_del(&w->entry);
2774                         kfree(w);
2775                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2776                 } break;
2777                 case BINDER_WORK_NODE: {
2778                         struct binder_node *node = container_of(w, struct binder_node, work);
2779                         uint32_t cmd = BR_NOOP;
2780                         const char *cmd_name;
2781                         int strong = node->internal_strong_refs || node->local_strong_refs;
2782                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2783
2784                         if (weak && !node->has_weak_ref) {
2785                                 cmd = BR_INCREFS;
2786                                 cmd_name = "BR_INCREFS";
2787                                 node->has_weak_ref = 1;
2788                                 node->pending_weak_ref = 1;
2789                                 node->local_weak_refs++;
2790                         } else if (strong && !node->has_strong_ref) {
2791                                 cmd = BR_ACQUIRE;
2792                                 cmd_name = "BR_ACQUIRE";
2793                                 node->has_strong_ref = 1;
2794                                 node->pending_strong_ref = 1;
2795                                 node->local_strong_refs++;
2796                         } else if (!strong && node->has_strong_ref) {
2797                                 cmd = BR_RELEASE;
2798                                 cmd_name = "BR_RELEASE";
2799                                 node->has_strong_ref = 0;
2800                         } else if (!weak && node->has_weak_ref) {
2801                                 cmd = BR_DECREFS;
2802                                 cmd_name = "BR_DECREFS";
2803                                 node->has_weak_ref = 0;
2804                         }
2805                         if (cmd != BR_NOOP) {
2806                                 if (put_user(cmd, (uint32_t __user *)ptr))
2807                                         return -EFAULT;
2808                                 ptr += sizeof(uint32_t);
2809                                 if (put_user(node->ptr,
2810                                              (binder_uintptr_t __user *)ptr))
2811                                         return -EFAULT;
2812                                 ptr += sizeof(binder_uintptr_t);
2813                                 if (put_user(node->cookie,
2814                                              (binder_uintptr_t __user *)ptr))
2815                                         return -EFAULT;
2816                                 ptr += sizeof(binder_uintptr_t);
2817
2818                                 binder_stat_br(proc, thread, cmd);
2819                                 binder_debug(BINDER_DEBUG_USER_REFS,
2820                                              "%d:%d %s %d u%016llx c%016llx\n",
2821                                              proc->pid, thread->pid, cmd_name,
2822                                              node->debug_id,
2823                                              (u64)node->ptr, (u64)node->cookie);
2824                         } else {
2825                                 list_del_init(&w->entry);
2826                                 if (!weak && !strong) {
2827                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2828                                                      "%d:%d node %d u%016llx c%016llx deleted\n",
2829                                                      proc->pid, thread->pid,
2830                                                      node->debug_id,
2831                                                      (u64)node->ptr,
2832                                                      (u64)node->cookie);
2833                                         rb_erase(&node->rb_node, &proc->nodes);
2834                                         kfree(node);
2835                                         binder_stats_deleted(BINDER_STAT_NODE);
2836                                 } else {
2837                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2838                                                      "%d:%d node %d u%016llx c%016llx state unchanged\n",
2839                                                      proc->pid, thread->pid,
2840                                                      node->debug_id,
2841                                                      (u64)node->ptr,
2842                                                      (u64)node->cookie);
2843                                 }
2844                         }
2845                 } break;
2846                 case BINDER_WORK_DEAD_BINDER:
2847                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2848                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2849                         struct binder_ref_death *death;
2850                         uint32_t cmd;
2851
2852                         death = container_of(w, struct binder_ref_death, work);
2853                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2854                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2855                         else
2856                                 cmd = BR_DEAD_BINDER;
2857                         if (put_user(cmd, (uint32_t __user *)ptr))
2858                                 return -EFAULT;
2859                         ptr += sizeof(uint32_t);
2860                         if (put_user(death->cookie,
2861                                      (binder_uintptr_t __user *)ptr))
2862                                 return -EFAULT;
2863                         ptr += sizeof(binder_uintptr_t);
2864                         binder_stat_br(proc, thread, cmd);
2865                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2866                                      "%d:%d %s %016llx\n",
2867                                       proc->pid, thread->pid,
2868                                       cmd == BR_DEAD_BINDER ?
2869                                       "BR_DEAD_BINDER" :
2870                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2871                                       (u64)death->cookie);
2872
2873                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2874                                 list_del(&w->entry);
2875                                 kfree(death);
2876                                 binder_stats_deleted(BINDER_STAT_DEATH);
2877                         } else
2878                                 list_move(&w->entry, &proc->delivered_death);
2879                         if (cmd == BR_DEAD_BINDER)
2880                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2881                 } break;
2882                 }
2883
2884                 if (!t)
2885                         continue;
2886
2887                 BUG_ON(t->buffer == NULL);
2888                 if (t->buffer->target_node) {
2889                         struct binder_node *target_node = t->buffer->target_node;
2890
2891                         tr.target.ptr = target_node->ptr;
2892                         tr.cookie =  target_node->cookie;
2893                         t->saved_priority = task_nice(current);
2894                         if (t->priority < target_node->min_priority &&
2895                             !(t->flags & TF_ONE_WAY))
2896                                 binder_set_nice(t->priority);
2897                         else if (!(t->flags & TF_ONE_WAY) ||
2898                                  t->saved_priority > target_node->min_priority)
2899                                 binder_set_nice(target_node->min_priority);
2900                         cmd = BR_TRANSACTION;
2901                 } else {
2902                         tr.target.ptr = 0;
2903                         tr.cookie = 0;
2904                         cmd = BR_REPLY;
2905                 }
2906                 tr.code = t->code;
2907                 tr.flags = t->flags;
2908                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2909
2910                 if (t->from) {
2911                         struct task_struct *sender = t->from->proc->tsk;
2912
2913                         tr.sender_pid = task_tgid_nr_ns(sender,
2914                                                         task_active_pid_ns(current));
2915                 } else {
2916                         tr.sender_pid = 0;
2917                 }
2918
2919                 tr.data_size = t->buffer->data_size;
2920                 tr.offsets_size = t->buffer->offsets_size;
2921                 tr.data.ptr.buffer = (binder_uintptr_t)(
2922                                         (uintptr_t)t->buffer->data +
2923                                         proc->user_buffer_offset);
2924                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2925                                         ALIGN(t->buffer->data_size,
2926                                             sizeof(void *));
2927
2928                 if (put_user(cmd, (uint32_t __user *)ptr))
2929                         return -EFAULT;
2930                 ptr += sizeof(uint32_t);
2931                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2932                         return -EFAULT;
2933                 ptr += sizeof(tr);
2934
2935                 trace_binder_transaction_received(t);
2936                 binder_stat_br(proc, thread, cmd);
2937                 binder_debug(BINDER_DEBUG_TRANSACTION,
2938                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2939                              proc->pid, thread->pid,
2940                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2941                              "BR_REPLY",
2942                              t->debug_id, t->from ? t->from->proc->pid : 0,
2943                              t->from ? t->from->pid : 0, cmd,
2944                              t->buffer->data_size, t->buffer->offsets_size,
2945                              (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2946
2947                 list_del(&t->work.entry);
2948                 t->buffer->allow_user_free = 1;
2949                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2950                         t->to_parent = thread->transaction_stack;
2951                         t->to_thread = thread;
2952                         thread->transaction_stack = t;
2953                 } else {
2954                         t->buffer->transaction = NULL;
2955                         kfree(t);
2956                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2957                 }
2958                 break;
2959         }
2960
2961 done:
2962
2963         *consumed = ptr - buffer;
2964         if (proc->requested_threads + proc->ready_threads == 0 &&
2965             proc->requested_threads_started < proc->max_threads &&
2966             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2967              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2968              /*spawn a new thread if we leave this out */) {
2969                 proc->requested_threads++;
2970                 binder_debug(BINDER_DEBUG_THREADS,
2971                              "%d:%d BR_SPAWN_LOOPER\n",
2972                              proc->pid, thread->pid);
2973                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2974                         return -EFAULT;
2975                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2976         }
2977         return 0;
2978 }
2979
2980 static void binder_release_work(struct list_head *list)
2981 {
2982         struct binder_work *w;
2983
2984         while (!list_empty(list)) {
2985                 w = list_first_entry(list, struct binder_work, entry);
2986                 list_del_init(&w->entry);
2987                 switch (w->type) {
2988                 case BINDER_WORK_TRANSACTION: {
2989                         struct binder_transaction *t;
2990
2991                         t = container_of(w, struct binder_transaction, work);
2992                         if (t->buffer->target_node &&
2993                             !(t->flags & TF_ONE_WAY)) {
2994                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2995                         } else {
2996                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2997                                         "undelivered transaction %d\n",
2998                                         t->debug_id);
2999                                 t->buffer->transaction = NULL;
3000                                 kfree(t);
3001                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
3002                         }
3003                 } break;
3004                 case BINDER_WORK_TRANSACTION_COMPLETE: {
3005                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
3006                                 "undelivered TRANSACTION_COMPLETE\n");
3007                         kfree(w);
3008                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
3009                 } break;
3010                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3011                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
3012                         struct binder_ref_death *death;
3013
3014                         death = container_of(w, struct binder_ref_death, work);
3015                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
3016                                 "undelivered death notification, %016llx\n",
3017                                 (u64)death->cookie);
3018                         kfree(death);
3019                         binder_stats_deleted(BINDER_STAT_DEATH);
3020                 } break;
3021                 default:
3022                         pr_err("unexpected work type, %d, not freed\n",
3023                                w->type);
3024                         break;
3025                 }
3026         }
3027
3028 }
3029
3030 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
3031 {
3032         struct binder_thread *thread = NULL;
3033         struct rb_node *parent = NULL;
3034         struct rb_node **p = &proc->threads.rb_node;
3035
3036         while (*p) {
3037                 parent = *p;
3038                 thread = rb_entry(parent, struct binder_thread, rb_node);
3039
3040                 if (current->pid < thread->pid)
3041                         p = &(*p)->rb_left;
3042                 else if (current->pid > thread->pid)
3043                         p = &(*p)->rb_right;
3044                 else
3045                         break;
3046         }
3047         if (*p == NULL) {
3048                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
3049                 if (thread == NULL)
3050                         return NULL;
3051                 binder_stats_created(BINDER_STAT_THREAD);
3052                 thread->proc = proc;
3053                 thread->pid = current->pid;
3054                 init_waitqueue_head(&thread->wait);
3055                 INIT_LIST_HEAD(&thread->todo);
3056                 rb_link_node(&thread->rb_node, parent, p);
3057                 rb_insert_color(&thread->rb_node, &proc->threads);
3058                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3059                 thread->return_error = BR_OK;
3060                 thread->return_error2 = BR_OK;
3061         }
3062         return thread;
3063 }
3064
3065 static int binder_free_thread(struct binder_proc *proc,
3066                               struct binder_thread *thread)
3067 {
3068         struct binder_transaction *t;
3069         struct binder_transaction *send_reply = NULL;
3070         int active_transactions = 0;
3071
3072         rb_erase(&thread->rb_node, &proc->threads);
3073         t = thread->transaction_stack;
3074         if (t && t->to_thread == thread)
3075                 send_reply = t;
3076         while (t) {
3077                 active_transactions++;
3078                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
3079                              "release %d:%d transaction %d %s, still active\n",
3080                               proc->pid, thread->pid,
3081                              t->debug_id,
3082                              (t->to_thread == thread) ? "in" : "out");
3083
3084                 if (t->to_thread == thread) {
3085                         t->to_proc = NULL;
3086                         t->to_thread = NULL;
3087                         if (t->buffer) {
3088                                 t->buffer->transaction = NULL;
3089                                 t->buffer = NULL;
3090                         }
3091                         t = t->to_parent;
3092                 } else if (t->from == thread) {
3093                         t->from = NULL;
3094                         t = t->from_parent;
3095                 } else
3096                         BUG();
3097         }
3098         if (send_reply)
3099                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
3100         binder_release_work(&thread->todo);
3101         kfree(thread);
3102         binder_stats_deleted(BINDER_STAT_THREAD);
3103         return active_transactions;
3104 }
3105
3106 static unsigned int binder_poll(struct file *filp,
3107                                 struct poll_table_struct *wait)
3108 {
3109         struct binder_proc *proc = filp->private_data;
3110         struct binder_thread *thread = NULL;
3111         int wait_for_proc_work;
3112
3113         binder_lock(__func__);
3114
3115         thread = binder_get_thread(proc);
3116
3117         wait_for_proc_work = thread->transaction_stack == NULL &&
3118                 list_empty(&thread->todo) && thread->return_error == BR_OK;
3119
3120         binder_unlock(__func__);
3121
3122         if (wait_for_proc_work) {
3123                 if (binder_has_proc_work(proc, thread))
3124                         return POLLIN;
3125                 poll_wait(filp, &proc->wait, wait);
3126                 if (binder_has_proc_work(proc, thread))
3127                         return POLLIN;
3128         } else {
3129                 if (binder_has_thread_work(thread))
3130                         return POLLIN;
3131                 poll_wait(filp, &thread->wait, wait);
3132                 if (binder_has_thread_work(thread))
3133                         return POLLIN;
3134         }
3135         return 0;
3136 }
3137
3138 static int binder_ioctl_write_read(struct file *filp,
3139                                 unsigned int cmd, unsigned long arg,
3140                                 struct binder_thread *thread)
3141 {
3142         int ret = 0;
3143         struct binder_proc *proc = filp->private_data;
3144         unsigned int size = _IOC_SIZE(cmd);
3145         void __user *ubuf = (void __user *)arg;
3146         struct binder_write_read bwr;
3147
3148         if (size != sizeof(struct binder_write_read)) {
3149                 ret = -EINVAL;
3150                 goto out;
3151         }
3152         if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
3153                 ret = -EFAULT;
3154                 goto out;
3155         }
3156         binder_debug(BINDER_DEBUG_READ_WRITE,
3157                      "%d:%d write %lld at %016llx, read %lld at %016llx\n",
3158                      proc->pid, thread->pid,
3159                      (u64)bwr.write_size, (u64)bwr.write_buffer,
3160                      (u64)bwr.read_size, (u64)bwr.read_buffer);
3161
3162         if (bwr.write_size > 0) {
3163                 ret = binder_thread_write(proc, thread,
3164                                           bwr.write_buffer,
3165                                           bwr.write_size,
3166                                           &bwr.write_consumed);
3167                 trace_binder_write_done(ret);
3168                 if (ret < 0) {
3169                         bwr.read_consumed = 0;
3170                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
3171                                 ret = -EFAULT;
3172                         goto out;
3173                 }
3174         }
3175         if (bwr.read_size > 0) {
3176                 ret = binder_thread_read(proc, thread, bwr.read_buffer,
3177                                          bwr.read_size,
3178                                          &bwr.read_consumed,
3179                                          filp->f_flags & O_NONBLOCK);
3180                 trace_binder_read_done(ret);
3181                 if (!list_empty(&proc->todo))
3182                         wake_up_interruptible(&proc->wait);
3183                 if (ret < 0) {
3184                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
3185                                 ret = -EFAULT;
3186                         goto out;
3187                 }
3188         }
3189         binder_debug(BINDER_DEBUG_READ_WRITE,
3190                      "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
3191                      proc->pid, thread->pid,
3192                      (u64)bwr.write_consumed, (u64)bwr.write_size,
3193                      (u64)bwr.read_consumed, (u64)bwr.read_size);
3194         if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
3195                 ret = -EFAULT;
3196                 goto out;
3197         }
3198 out:
3199         return ret;
3200 }
3201
3202 static int binder_ioctl_set_ctx_mgr(struct file *filp)
3203 {
3204         int ret = 0;
3205         struct binder_proc *proc = filp->private_data;
3206         struct binder_context *context = proc->context;
3207
3208         kuid_t curr_euid = current_euid();
3209
3210         if (context->binder_context_mgr_node) {
3211                 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
3212                 ret = -EBUSY;
3213                 goto out;
3214         }
3215         ret = security_binder_set_context_mgr(proc->tsk);
3216         if (ret < 0)
3217                 goto out;
3218         if (uid_valid(context->binder_context_mgr_uid)) {
3219                 if (!uid_eq(context->binder_context_mgr_uid, curr_euid)) {
3220                         pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
3221                                from_kuid(&init_user_ns, curr_euid),
3222                                from_kuid(&init_user_ns,
3223                                          context->binder_context_mgr_uid));
3224                         ret = -EPERM;
3225                         goto out;
3226                 }
3227         } else {
3228                 context->binder_context_mgr_uid = curr_euid;
3229         }
3230         context->binder_context_mgr_node = binder_new_node(proc, 0, 0);
3231         if (!context->binder_context_mgr_node) {
3232                 ret = -ENOMEM;
3233                 goto out;
3234         }
3235         context->binder_context_mgr_node->local_weak_refs++;
3236         context->binder_context_mgr_node->local_strong_refs++;
3237         context->binder_context_mgr_node->has_strong_ref = 1;
3238         context->binder_context_mgr_node->has_weak_ref = 1;
3239 out:
3240         return ret;
3241 }
3242
3243 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
3244 {
3245         int ret;
3246         struct binder_proc *proc = filp->private_data;
3247         struct binder_thread *thread;
3248         unsigned int size = _IOC_SIZE(cmd);
3249         void __user *ubuf = (void __user *)arg;
3250
3251         /*pr_info("binder_ioctl: %d:%d %x %lx\n",
3252                         proc->pid, current->pid, cmd, arg);*/
3253
3254         trace_binder_ioctl(cmd, arg);
3255
3256         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
3257         if (ret)
3258                 goto err_unlocked;
3259
3260         binder_lock(__func__);
3261         thread = binder_get_thread(proc);
3262         if (thread == NULL) {
3263                 ret = -ENOMEM;
3264                 goto err;
3265         }
3266
3267         switch (cmd) {
3268         case BINDER_WRITE_READ:
3269                 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
3270                 if (ret)
3271                         goto err;
3272                 break;
3273         case BINDER_SET_MAX_THREADS:
3274                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
3275                         ret = -EINVAL;
3276                         goto err;
3277                 }
3278                 break;
3279         case BINDER_SET_CONTEXT_MGR:
3280                 ret = binder_ioctl_set_ctx_mgr(filp);
3281                 if (ret)
3282                         goto err;
3283                 break;
3284         case BINDER_THREAD_EXIT:
3285                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
3286                              proc->pid, thread->pid);
3287                 binder_free_thread(proc, thread);
3288                 thread = NULL;
3289                 break;
3290         case BINDER_VERSION: {
3291                 struct binder_version __user *ver = ubuf;
3292
3293                 if (size != sizeof(struct binder_version)) {
3294                         ret = -EINVAL;
3295                         goto err;
3296                 }
3297                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
3298                              &ver->protocol_version)) {
3299                         ret = -EINVAL;
3300                         goto err;
3301                 }
3302                 break;
3303         }
3304         default:
3305                 ret = -EINVAL;
3306                 goto err;
3307         }
3308         ret = 0;
3309 err:
3310         if (thread)
3311                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
3312         binder_unlock(__func__);
3313         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
3314         if (ret && ret != -ERESTARTSYS)
3315                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
3316 err_unlocked:
3317         trace_binder_ioctl_done(ret);
3318         return ret;
3319 }
3320
3321 static void binder_vma_open(struct vm_area_struct *vma)
3322 {
3323         struct binder_proc *proc = vma->vm_private_data;
3324
3325         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3326                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
3327                      proc->pid, vma->vm_start, vma->vm_end,
3328                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
3329                      (unsigned long)pgprot_val(vma->vm_page_prot));
3330 }
3331
3332 static void binder_vma_close(struct vm_area_struct *vma)
3333 {
3334         struct binder_proc *proc = vma->vm_private_data;
3335
3336         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3337                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
3338                      proc->pid, vma->vm_start, vma->vm_end,
3339                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
3340                      (unsigned long)pgprot_val(vma->vm_page_prot));
3341         proc->vma = NULL;
3342         proc->vma_vm_mm = NULL;
3343         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
3344 }
3345
3346 static int binder_vm_fault(struct vm_fault *vmf)
3347 {
3348         return VM_FAULT_SIGBUS;
3349 }
3350
3351 static const struct vm_operations_struct binder_vm_ops = {
3352         .open = binder_vma_open,
3353         .close = binder_vma_close,
3354         .fault = binder_vm_fault,
3355 };
3356
3357 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
3358 {
3359         int ret;
3360         struct vm_struct *area;
3361         struct binder_proc *proc = filp->private_data;
3362         const char *failure_string;
3363         struct binder_buffer *buffer;
3364
3365         if (proc->tsk != current)
3366                 return -EINVAL;
3367
3368         if ((vma->vm_end - vma->vm_start) > SZ_4M)
3369                 vma->vm_end = vma->vm_start + SZ_4M;
3370
3371         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3372                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
3373                      proc->pid, vma->vm_start, vma->vm_end,
3374                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
3375                      (unsigned long)pgprot_val(vma->vm_page_prot));
3376
3377         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
3378                 ret = -EPERM;
3379                 failure_string = "bad vm_flags";
3380                 goto err_bad_arg;
3381         }
3382         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
3383
3384         mutex_lock(&binder_mmap_lock);
3385         if (proc->buffer) {
3386                 ret = -EBUSY;
3387                 failure_string = "already mapped";
3388                 goto err_already_mapped;
3389         }
3390
3391         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
3392         if (area == NULL) {
3393                 ret = -ENOMEM;
3394                 failure_string = "get_vm_area";
3395                 goto err_get_vm_area_failed;
3396         }
3397         proc->buffer = area->addr;
3398         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
3399         mutex_unlock(&binder_mmap_lock);
3400
3401 #ifdef CONFIG_CPU_CACHE_VIPT
3402         if (cache_is_vipt_aliasing()) {
3403                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
3404                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
3405                         vma->vm_start += PAGE_SIZE;
3406                 }
3407         }
3408 #endif
3409         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
3410         if (proc->pages == NULL) {
3411                 ret = -ENOMEM;
3412                 failure_string = "alloc page array";
3413                 goto err_alloc_pages_failed;
3414         }
3415         proc->buffer_size = vma->vm_end - vma->vm_start;
3416
3417         vma->vm_ops = &binder_vm_ops;
3418         vma->vm_private_data = proc;
3419
3420         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
3421                 ret = -ENOMEM;
3422                 failure_string = "alloc small buf";
3423                 goto err_alloc_small_buf_failed;
3424         }
3425         buffer = proc->buffer;
3426         INIT_LIST_HEAD(&proc->buffers);
3427         list_add(&buffer->entry, &proc->buffers);
3428         buffer->free = 1;
3429         binder_insert_free_buffer(proc, buffer);
3430         proc->free_async_space = proc->buffer_size / 2;
3431         barrier();
3432         proc->files = get_files_struct(current);
3433         proc->vma = vma;
3434         proc->vma_vm_mm = vma->vm_mm;
3435
3436         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
3437                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
3438         return 0;
3439
3440 err_alloc_small_buf_failed:
3441         kfree(proc->pages);
3442         proc->pages = NULL;
3443 err_alloc_pages_failed:
3444         mutex_lock(&binder_mmap_lock);
3445         vfree(proc->buffer);
3446         proc->buffer = NULL;
3447 err_get_vm_area_failed:
3448 err_already_mapped:
3449         mutex_unlock(&binder_mmap_lock);
3450 err_bad_arg:
3451         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
3452                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
3453         return ret;
3454 }
3455
3456 static int binder_open(struct inode *nodp, struct file *filp)
3457 {
3458         struct binder_proc *proc;
3459         struct binder_device *binder_dev;
3460
3461         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
3462                      current->group_leader->pid, current->pid);
3463
3464         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
3465         if (proc == NULL)
3466                 return -ENOMEM;
3467         get_task_struct(current->group_leader);
3468         proc->tsk = current->group_leader;
3469         INIT_LIST_HEAD(&proc->todo);
3470         init_waitqueue_head(&proc->wait);
3471         proc->default_priority = task_nice(current);
3472         binder_dev = container_of(filp->private_data, struct binder_device,
3473                                   miscdev);
3474         proc->context = &binder_dev->context;
3475
3476         binder_lock(__func__);
3477
3478         binder_stats_created(BINDER_STAT_PROC);
3479         hlist_add_head(&proc->proc_node, &binder_procs);
3480         proc->pid = current->group_leader->pid;
3481         INIT_LIST_HEAD(&proc->delivered_death);
3482         filp->private_data = proc;
3483
3484         binder_unlock(__func__);
3485
3486         if (binder_debugfs_dir_entry_proc) {
3487                 char strbuf[11];
3488
3489                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
3490                 /*
3491                  * proc debug entries are shared between contexts, so
3492                  * this will fail if the process tries to open the driver
3493                  * again with a different context. The priting code will
3494                  * anyway print all contexts that a given PID has, so this
3495                  * is not a problem.
3496                  */
3497                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
3498                         binder_debugfs_dir_entry_proc,
3499                         (void *)(unsigned long)proc->pid,
3500                         &binder_proc_fops);
3501         }
3502
3503         return 0;
3504 }
3505
3506 static int binder_flush(struct file *filp, fl_owner_t id)
3507 {
3508         struct binder_proc *proc = filp->private_data;
3509
3510         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
3511
3512         return 0;
3513 }
3514
3515 static void binder_deferred_flush(struct binder_proc *proc)
3516 {
3517         struct rb_node *n;
3518         int wake_count = 0;
3519
3520         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
3521                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3522
3523                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3524                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3525                         wake_up_interruptible(&thread->wait);
3526                         wake_count++;
3527                 }
3528         }
3529         wake_up_interruptible_all(&proc->wait);
3530
3531         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3532                      "binder_flush: %d woke %d threads\n", proc->pid,
3533                      wake_count);
3534 }
3535
3536 static int binder_release(struct inode *nodp, struct file *filp)
3537 {
3538         struct binder_proc *proc = filp->private_data;
3539
3540         debugfs_remove(proc->debugfs_entry);
3541         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3542
3543         return 0;
3544 }
3545
3546 static int binder_node_release(struct binder_node *node, int refs)
3547 {
3548         struct binder_ref *ref;
3549         int death = 0;
3550
3551         list_del_init(&node->work.entry);
3552         binder_release_work(&node->async_todo);
3553
3554         if (hlist_empty(&node->refs)) {
3555                 kfree(node);
3556                 binder_stats_deleted(BINDER_STAT_NODE);
3557
3558                 return refs;
3559         }
3560
3561         node->proc = NULL;
3562         node->local_strong_refs = 0;
3563         node->local_weak_refs = 0;
3564         hlist_add_head(&node->dead_node, &binder_dead_nodes);
3565
3566         hlist_for_each_entry(ref, &node->refs, node_entry) {
3567                 refs++;
3568
3569                 if (!ref->death)
3570                         continue;
3571
3572                 death++;
3573
3574                 if (list_empty(&ref->death->work.entry)) {
3575                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3576                         list_add_tail(&ref->death->work.entry,
3577                                       &ref->proc->todo);
3578                         wake_up_interruptible(&ref->proc->wait);
3579                 } else
3580                         BUG();
3581         }
3582
3583         binder_debug(BINDER_DEBUG_DEAD_BINDER,
3584                      "node %d now dead, refs %d, death %d\n",
3585                      node->debug_id, refs, death);
3586
3587         return refs;
3588 }
3589
3590 static void binder_deferred_release(struct binder_proc *proc)
3591 {
3592         struct binder_transaction *t;
3593         struct binder_context *context = proc->context;
3594         struct rb_node *n;
3595         int threads, nodes, incoming_refs, outgoing_refs, buffers,
3596                 active_transactions, page_count;
3597
3598         BUG_ON(proc->vma);
3599         BUG_ON(proc->files);
3600
3601         hlist_del(&proc->proc_node);
3602
3603         if (context->binder_context_mgr_node &&
3604             context->binder_context_mgr_node->proc == proc) {
3605                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3606                              "%s: %d context_mgr_node gone\n",
3607                              __func__, proc->pid);
3608                 context->binder_context_mgr_node = NULL;
3609         }
3610
3611         threads = 0;
3612         active_transactions = 0;
3613         while ((n = rb_first(&proc->threads))) {
3614                 struct binder_thread *thread;
3615
3616                 thread = rb_entry(n, struct binder_thread, rb_node);
3617                 threads++;
3618                 active_transactions += binder_free_thread(proc, thread);
3619         }
3620
3621         nodes = 0;
3622         incoming_refs = 0;
3623         while ((n = rb_first(&proc->nodes))) {
3624                 struct binder_node *node;
3625
3626                 node = rb_entry(n, struct binder_node, rb_node);
3627                 nodes++;
3628                 rb_erase(&node->rb_node, &proc->nodes);
3629                 incoming_refs = binder_node_release(node, incoming_refs);
3630         }
3631
3632         outgoing_refs = 0;
3633         while ((n = rb_first(&proc->refs_by_desc))) {
3634                 struct binder_ref *ref;
3635
3636                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3637                 outgoing_refs++;
3638                 binder_delete_ref(ref);
3639         }
3640
3641         binder_release_work(&proc->todo);
3642         binder_release_work(&proc->delivered_death);
3643
3644         buffers = 0;
3645         while ((n = rb_first(&proc->allocated_buffers))) {
3646                 struct binder_buffer *buffer;
3647
3648                 buffer = rb_entry(n, struct binder_buffer, rb_node);
3649
3650                 t = buffer->transaction;
3651                 if (t) {
3652                         t->buffer = NULL;
3653                         buffer->transaction = NULL;
3654                         pr_err("release proc %d, transaction %d, not freed\n",
3655                                proc->pid, t->debug_id);
3656                         /*BUG();*/
3657                 }
3658
3659                 binder_free_buf(proc, buffer);
3660                 buffers++;
3661         }
3662
3663         binder_stats_deleted(BINDER_STAT_PROC);
3664
3665         page_count = 0;
3666         if (proc->pages) {
3667                 int i;
3668
3669                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3670                         void *page_addr;
3671
3672                         if (!proc->pages[i])
3673                                 continue;
3674
3675                         page_addr = proc->buffer + i * PAGE_SIZE;
3676                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3677                                      "%s: %d: page %d at %p not freed\n",
3678                                      __func__, proc->pid, i, page_addr);
3679                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3680                         __free_page(proc->pages[i]);
3681                         page_count++;
3682                 }
3683                 kfree(proc->pages);
3684                 vfree(proc->buffer);
3685         }
3686
3687         put_task_struct(proc->tsk);
3688
3689         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3690                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3691                      __func__, proc->pid, threads, nodes, incoming_refs,
3692                      outgoing_refs, active_transactions, buffers, page_count);
3693
3694         kfree(proc);
3695 }
3696
3697 static void binder_deferred_func(struct work_struct *work)
3698 {
3699         struct binder_proc *proc;
3700         struct files_struct *files;
3701
3702         int defer;
3703
3704         do {
3705                 binder_lock(__func__);
3706                 mutex_lock(&binder_deferred_lock);
3707                 if (!hlist_empty(&binder_deferred_list)) {
3708                         proc = hlist_entry(binder_deferred_list.first,
3709                                         struct binder_proc, deferred_work_node);
3710                         hlist_del_init(&proc->deferred_work_node);
3711                         defer = proc->deferred_work;
3712                         proc->deferred_work = 0;
3713                 } else {
3714                         proc = NULL;
3715                         defer = 0;
3716                 }
3717                 mutex_unlock(&binder_deferred_lock);
3718
3719                 files = NULL;
3720                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3721                         files = proc->files;
3722                         if (files)
3723                                 proc->files = NULL;
3724                 }
3725
3726                 if (defer & BINDER_DEFERRED_FLUSH)
3727                         binder_deferred_flush(proc);
3728
3729                 if (defer & BINDER_DEFERRED_RELEASE)
3730                         binder_deferred_release(proc); /* frees proc */
3731
3732                 binder_unlock(__func__);
3733                 if (files)
3734                         put_files_struct(files);
3735         } while (proc);
3736 }
3737 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3738
3739 static void
3740 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3741 {
3742         mutex_lock(&binder_deferred_lock);
3743         proc->deferred_work |= defer;
3744         if (hlist_unhashed(&proc->deferred_work_node)) {
3745                 hlist_add_head(&proc->deferred_work_node,
3746                                 &binder_deferred_list);
3747                 schedule_work(&binder_deferred_work);
3748         }
3749         mutex_unlock(&binder_deferred_lock);
3750 }
3751
3752 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3753                                      struct binder_transaction *t)
3754 {
3755         seq_printf(m,
3756                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3757                    prefix, t->debug_id, t,
3758                    t->from ? t->from->proc->pid : 0,
3759                    t->from ? t->from->pid : 0,
3760                    t->to_proc ? t->to_proc->pid : 0,
3761                    t->to_thread ? t->to_thread->pid : 0,
3762                    t->code, t->flags, t->priority, t->need_reply);
3763         if (t->buffer == NULL) {
3764                 seq_puts(m, " buffer free\n");
3765                 return;
3766         }
3767         if (t->buffer->target_node)
3768                 seq_printf(m, " node %d",
3769                            t->buffer->target_node->debug_id);
3770         seq_printf(m, " size %zd:%zd data %p\n",
3771                    t->buffer->data_size, t->buffer->offsets_size,
3772                    t->buffer->data);
3773 }
3774
3775 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3776                                 struct binder_buffer *buffer)
3777 {
3778         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3779                    prefix, buffer->debug_id, buffer->data,
3780                    buffer->data_size, buffer->offsets_size,
3781                    buffer->transaction ? "active" : "delivered");
3782 }
3783
3784 static void print_binder_work(struct seq_file *m, const char *prefix,
3785                               const char *transaction_prefix,
3786                               struct binder_work *w)
3787 {
3788         struct binder_node *node;
3789         struct binder_transaction *t;
3790
3791         switch (w->type) {
3792         case BINDER_WORK_TRANSACTION:
3793                 t = container_of(w, struct binder_transaction, work);
3794                 print_binder_transaction(m, transaction_prefix, t);
3795                 break;
3796         case BINDER_WORK_TRANSACTION_COMPLETE:
3797                 seq_printf(m, "%stransaction complete\n", prefix);
3798                 break;
3799         case BINDER_WORK_NODE:
3800                 node = container_of(w, struct binder_node, work);
3801                 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3802                            prefix, node->debug_id,
3803                            (u64)node->ptr, (u64)node->cookie);
3804                 break;
3805         case BINDER_WORK_DEAD_BINDER:
3806                 seq_printf(m, "%shas dead binder\n", prefix);
3807                 break;
3808         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3809                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3810                 break;
3811         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3812                 seq_printf(m, "%shas cleared death notification\n", prefix);
3813                 break;
3814         default:
3815                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3816                 break;
3817         }
3818 }
3819
3820 static void print_binder_thread(struct seq_file *m,
3821                                 struct binder_thread *thread,
3822                                 int print_always)
3823 {
3824         struct binder_transaction *t;
3825         struct binder_work *w;
3826         size_t start_pos = m->count;
3827         size_t header_pos;
3828
3829         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3830         header_pos = m->count;
3831         t = thread->transaction_stack;
3832         while (t) {
3833                 if (t->from == thread) {
3834                         print_binder_transaction(m,
3835                                                  "    outgoing transaction", t);
3836                         t = t->from_parent;
3837                 } else if (t->to_thread == thread) {
3838                         print_binder_transaction(m,
3839                                                  "    incoming transaction", t);
3840                         t = t->to_parent;
3841                 } else {
3842                         print_binder_transaction(m, "    bad transaction", t);
3843                         t = NULL;
3844                 }
3845         }
3846         list_for_each_entry(w, &thread->todo, entry) {
3847                 print_binder_work(m, "    ", "    pending transaction", w);
3848         }
3849         if (!print_always && m->count == header_pos)
3850                 m->count = start_pos;
3851 }
3852
3853 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3854 {
3855         struct binder_ref *ref;
3856         struct binder_work *w;
3857         int count;
3858
3859         count = 0;
3860         hlist_for_each_entry(ref, &node->refs, node_entry)
3861                 count++;
3862
3863         seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3864                    node->debug_id, (u64)node->ptr, (u64)node->cookie,
3865                    node->has_strong_ref, node->has_weak_ref,
3866                    node->local_strong_refs, node->local_weak_refs,
3867                    node->internal_strong_refs, count);
3868         if (count) {
3869                 seq_puts(m, " proc");
3870                 hlist_for_each_entry(ref, &node->refs, node_entry)
3871                         seq_printf(m, " %d", ref->proc->pid);
3872         }
3873         seq_puts(m, "\n");
3874         list_for_each_entry(w, &node->async_todo, entry)
3875                 print_binder_work(m, "    ",
3876                                   "    pending async transaction", w);
3877 }
3878
3879 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3880 {
3881         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3882                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3883                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3884 }
3885
3886 static void print_binder_proc(struct seq_file *m,
3887                               struct binder_proc *proc, int print_all)
3888 {
3889         struct binder_work *w;
3890         struct rb_node *n;
3891         size_t start_pos = m->count;
3892         size_t header_pos;
3893
3894         seq_printf(m, "proc %d\n", proc->pid);
3895         seq_printf(m, "context %s\n", proc->context->name);
3896         header_pos = m->count;
3897
3898         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3899                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3900                                                 rb_node), print_all);
3901         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3902                 struct binder_node *node = rb_entry(n, struct binder_node,
3903                                                     rb_node);
3904                 if (print_all || node->has_async_transaction)
3905                         print_binder_node(m, node);
3906         }
3907         if (print_all) {
3908                 for (n = rb_first(&proc->refs_by_desc);
3909                      n != NULL;
3910                      n = rb_next(n))
3911                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3912                                                      rb_node_desc));
3913         }
3914         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3915                 print_binder_buffer(m, "  buffer",
3916                                     rb_entry(n, struct binder_buffer, rb_node));
3917         list_for_each_entry(w, &proc->todo, entry)
3918                 print_binder_work(m, "  ", "  pending transaction", w);
3919         list_for_each_entry(w, &proc->delivered_death, entry) {
3920                 seq_puts(m, "  has delivered dead binder\n");
3921                 break;
3922         }
3923         if (!print_all && m->count == header_pos)
3924                 m->count = start_pos;
3925 }
3926
3927 static const char * const binder_return_strings[] = {
3928         "BR_ERROR",
3929         "BR_OK",
3930         "BR_TRANSACTION",
3931         "BR_REPLY",
3932         "BR_ACQUIRE_RESULT",
3933         "BR_DEAD_REPLY",
3934         "BR_TRANSACTION_COMPLETE",
3935         "BR_INCREFS",
3936         "BR_ACQUIRE",
3937         "BR_RELEASE",
3938         "BR_DECREFS",
3939         "BR_ATTEMPT_ACQUIRE",
3940         "BR_NOOP",
3941         "BR_SPAWN_LOOPER",
3942         "BR_FINISHED",
3943         "BR_DEAD_BINDER",
3944         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3945         "BR_FAILED_REPLY"
3946 };
3947
3948 static const char * const binder_command_strings[] = {
3949         "BC_TRANSACTION",
3950         "BC_REPLY",
3951         "BC_ACQUIRE_RESULT",
3952         "BC_FREE_BUFFER",
3953         "BC_INCREFS",
3954         "BC_ACQUIRE",
3955         "BC_RELEASE",
3956         "BC_DECREFS",
3957         "BC_INCREFS_DONE",
3958         "BC_ACQUIRE_DONE",
3959         "BC_ATTEMPT_ACQUIRE",
3960         "BC_REGISTER_LOOPER",
3961         "BC_ENTER_LOOPER",
3962         "BC_EXIT_LOOPER",
3963         "BC_REQUEST_DEATH_NOTIFICATION",
3964         "BC_CLEAR_DEATH_NOTIFICATION",
3965         "BC_DEAD_BINDER_DONE",
3966         "BC_TRANSACTION_SG",
3967         "BC_REPLY_SG",
3968 };
3969
3970 static const char * const binder_objstat_strings[] = {
3971         "proc",
3972         "thread",
3973         "node",
3974         "ref",
3975         "death",
3976         "transaction",
3977         "transaction_complete"
3978 };
3979
3980 static void print_binder_stats(struct seq_file *m, const char *prefix,
3981                                struct binder_stats *stats)
3982 {
3983         int i;
3984
3985         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3986                      ARRAY_SIZE(binder_command_strings));
3987         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3988                 if (stats->bc[i])
3989                         seq_printf(m, "%s%s: %d\n", prefix,
3990                                    binder_command_strings[i], stats->bc[i]);
3991         }
3992
3993         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3994                      ARRAY_SIZE(binder_return_strings));
3995         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3996                 if (stats->br[i])
3997                         seq_printf(m, "%s%s: %d\n", prefix,
3998                                    binder_return_strings[i], stats->br[i]);
3999         }
4000
4001         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
4002                      ARRAY_SIZE(binder_objstat_strings));
4003         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
4004                      ARRAY_SIZE(stats->obj_deleted));
4005         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
4006                 if (stats->obj_created[i] || stats->obj_deleted[i])
4007                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
4008                                 binder_objstat_strings[i],
4009                                 stats->obj_created[i] - stats->obj_deleted[i],
4010                                 stats->obj_created[i]);
4011         }
4012 }
4013
4014 static void print_binder_proc_stats(struct seq_file *m,
4015                                     struct binder_proc *proc)
4016 {
4017         struct binder_work *w;
4018         struct rb_node *n;
4019         int count, strong, weak;
4020
4021         seq_printf(m, "proc %d\n", proc->pid);
4022         seq_printf(m, "context %s\n", proc->context->name);
4023         count = 0;
4024         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
4025                 count++;
4026         seq_printf(m, "  threads: %d\n", count);
4027         seq_printf(m, "  requested threads: %d+%d/%d\n"
4028                         "  ready threads %d\n"
4029                         "  free async space %zd\n", proc->requested_threads,
4030                         proc->requested_threads_started, proc->max_threads,
4031                         proc->ready_threads, proc->free_async_space);
4032         count = 0;
4033         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
4034                 count++;
4035         seq_printf(m, "  nodes: %d\n", count);
4036         count = 0;
4037         strong = 0;
4038         weak = 0;
4039         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
4040                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
4041                                                   rb_node_desc);
4042                 count++;
4043                 strong += ref->strong;
4044                 weak += ref->weak;
4045         }
4046         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
4047
4048         count = 0;
4049         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
4050                 count++;
4051         seq_printf(m, "  buffers: %d\n", count);
4052
4053         count = 0;
4054         list_for_each_entry(w, &proc->todo, entry) {
4055                 switch (w->type) {
4056                 case BINDER_WORK_TRANSACTION:
4057                         count++;
4058                         break;
4059                 default:
4060                         break;
4061                 }
4062         }
4063         seq_printf(m, "  pending transactions: %d\n", count);
4064
4065         print_binder_stats(m, "  ", &proc->stats);
4066 }
4067
4068
4069 static int binder_state_show(struct seq_file *m, void *unused)
4070 {
4071         struct binder_proc *proc;
4072         struct binder_node *node;
4073         int do_lock = !binder_debug_no_lock;
4074
4075         if (do_lock)
4076                 binder_lock(__func__);
4077
4078         seq_puts(m, "binder state:\n");
4079
4080         if (!hlist_empty(&binder_dead_nodes))
4081                 seq_puts(m, "dead nodes:\n");
4082         hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
4083                 print_binder_node(m, node);
4084
4085         hlist_for_each_entry(proc, &binder_procs, proc_node)
4086                 print_binder_proc(m, proc, 1);
4087         if (do_lock)
4088                 binder_unlock(__func__);
4089         return 0;
4090 }
4091
4092 static int binder_stats_show(struct seq_file *m, void *unused)
4093 {
4094         struct binder_proc *proc;
4095         int do_lock = !binder_debug_no_lock;
4096
4097         if (do_lock)
4098                 binder_lock(__func__);
4099
4100         seq_puts(m, "binder stats:\n");
4101
4102         print_binder_stats(m, "", &binder_stats);
4103
4104         hlist_for_each_entry(proc, &binder_procs, proc_node)
4105                 print_binder_proc_stats(m, proc);
4106         if (do_lock)
4107                 binder_unlock(__func__);
4108         return 0;
4109 }
4110
4111 static int binder_transactions_show(struct seq_file *m, void *unused)
4112 {
4113         struct binder_proc *proc;
4114         int do_lock = !binder_debug_no_lock;
4115
4116         if (do_lock)
4117                 binder_lock(__func__);
4118
4119         seq_puts(m, "binder transactions:\n");
4120         hlist_for_each_entry(proc, &binder_procs, proc_node)
4121                 print_binder_proc(m, proc, 0);
4122         if (do_lock)
4123                 binder_unlock(__func__);
4124         return 0;
4125 }
4126
4127 static int binder_proc_show(struct seq_file *m, void *unused)
4128 {
4129         struct binder_proc *itr;
4130         int pid = (unsigned long)m->private;
4131         int do_lock = !binder_debug_no_lock;
4132
4133         if (do_lock)
4134                 binder_lock(__func__);
4135
4136         hlist_for_each_entry(itr, &binder_procs, proc_node) {
4137                 if (itr->pid == pid) {
4138                         seq_puts(m, "binder proc state:\n");
4139                         print_binder_proc(m, itr, 1);
4140                 }
4141         }
4142         if (do_lock)
4143                 binder_unlock(__func__);
4144         return 0;
4145 }
4146
4147 static void print_binder_transaction_log_entry(struct seq_file *m,
4148                                         struct binder_transaction_log_entry *e)
4149 {
4150         seq_printf(m,
4151                    "%d: %s from %d:%d to %d:%d context %s node %d handle %d size %d:%d\n",
4152                    e->debug_id, (e->call_type == 2) ? "reply" :
4153                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
4154                    e->from_thread, e->to_proc, e->to_thread, e->context_name,
4155                    e->to_node, e->target_handle, e->data_size, e->offsets_size);
4156 }
4157
4158 static int binder_transaction_log_show(struct seq_file *m, void *unused)
4159 {
4160         struct binder_transaction_log *log = m->private;
4161         int i;
4162
4163         if (log->full) {
4164                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
4165                         print_binder_transaction_log_entry(m, &log->entry[i]);
4166         }
4167         for (i = 0; i < log->next; i++)
4168                 print_binder_transaction_log_entry(m, &log->entry[i]);
4169         return 0;
4170 }
4171
4172 static const struct file_operations binder_fops = {
4173         .owner = THIS_MODULE,
4174         .poll = binder_poll,
4175         .unlocked_ioctl = binder_ioctl,
4176         .compat_ioctl = binder_ioctl,
4177         .mmap = binder_mmap,
4178         .open = binder_open,
4179         .flush = binder_flush,
4180         .release = binder_release,
4181 };
4182
4183 BINDER_DEBUG_ENTRY(state);
4184 BINDER_DEBUG_ENTRY(stats);
4185 BINDER_DEBUG_ENTRY(transactions);
4186 BINDER_DEBUG_ENTRY(transaction_log);
4187
4188 static int __init init_binder_device(const char *name)
4189 {
4190         int ret;
4191         struct binder_device *binder_device;
4192
4193         binder_device = kzalloc(sizeof(*binder_device), GFP_KERNEL);
4194         if (!binder_device)
4195                 return -ENOMEM;
4196
4197         binder_device->miscdev.fops = &binder_fops;
4198         binder_device->miscdev.minor = MISC_DYNAMIC_MINOR;
4199         binder_device->miscdev.name = name;
4200
4201         binder_device->context.binder_context_mgr_uid = INVALID_UID;
4202         binder_device->context.name = name;
4203
4204         ret = misc_register(&binder_device->miscdev);
4205         if (ret < 0) {
4206                 kfree(binder_device);
4207                 return ret;
4208         }
4209
4210         hlist_add_head(&binder_device->hlist, &binder_devices);
4211
4212         return ret;
4213 }
4214
4215 static int __init binder_init(void)
4216 {
4217         int ret;
4218         char *device_name, *device_names;
4219         struct binder_device *device;
4220         struct hlist_node *tmp;
4221
4222         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
4223         if (binder_debugfs_dir_entry_root)
4224                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
4225                                                  binder_debugfs_dir_entry_root);
4226
4227         if (binder_debugfs_dir_entry_root) {
4228                 debugfs_create_file("state",
4229                                     S_IRUGO,
4230                                     binder_debugfs_dir_entry_root,
4231                                     NULL,
4232                                     &binder_state_fops);
4233                 debugfs_create_file("stats",
4234                                     S_IRUGO,
4235                                     binder_debugfs_dir_entry_root,
4236                                     NULL,
4237                                     &binder_stats_fops);
4238                 debugfs_create_file("transactions",
4239                                     S_IRUGO,
4240                                     binder_debugfs_dir_entry_root,
4241                                     NULL,
4242                                     &binder_transactions_fops);
4243                 debugfs_create_file("transaction_log",
4244                                     S_IRUGO,
4245                                     binder_debugfs_dir_entry_root,
4246                                     &binder_transaction_log,
4247                                     &binder_transaction_log_fops);
4248                 debugfs_create_file("failed_transaction_log",
4249                                     S_IRUGO,
4250                                     binder_debugfs_dir_entry_root,
4251                                     &binder_transaction_log_failed,
4252                                     &binder_transaction_log_fops);
4253         }
4254
4255         /*
4256          * Copy the module_parameter string, because we don't want to
4257          * tokenize it in-place.
4258          */
4259         device_names = kzalloc(strlen(binder_devices_param) + 1, GFP_KERNEL);
4260         if (!device_names) {
4261                 ret = -ENOMEM;
4262                 goto err_alloc_device_names_failed;
4263         }
4264         strcpy(device_names, binder_devices_param);
4265
4266         while ((device_name = strsep(&device_names, ","))) {
4267                 ret = init_binder_device(device_name);
4268                 if (ret)
4269                         goto err_init_binder_device_failed;
4270         }
4271
4272         return ret;
4273
4274 err_init_binder_device_failed:
4275         hlist_for_each_entry_safe(device, tmp, &binder_devices, hlist) {
4276                 misc_deregister(&device->miscdev);
4277                 hlist_del(&device->hlist);
4278                 kfree(device);
4279         }
4280 err_alloc_device_names_failed:
4281         debugfs_remove_recursive(binder_debugfs_dir_entry_root);
4282
4283         return ret;
4284 }
4285
4286 device_initcall(binder_init);
4287
4288 #define CREATE_TRACE_POINTS
4289 #include "binder_trace.h"
4290
4291 MODULE_LICENSE("GPL v2");