fs/binfmt_elf_fdpic.c

   1 /* binfmt_elf_fdpic.c: FDPIC ELF binary format
   2  *
   3  * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  * Derived from binfmt_elf.c
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 #include <linux/module.h>
  14
  15 #include <linux/fs.h>
  16 #include <linux/stat.h>
  17 #include <linux/sched.h>
  18 #include <linux/mm.h>
  19 #include <linux/mman.h>
  20 #include <linux/errno.h>
  21 #include <linux/signal.h>
  22 #include <linux/binfmts.h>
  23 #include <linux/string.h>
  24 #include <linux/file.h>
  25 #include <linux/fcntl.h>
  26 #include <linux/slab.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/security.h>
  29 #include <linux/highmem.h>
  30 #include <linux/highuid.h>
  31 #include <linux/personality.h>
  32 #include <linux/ptrace.h>
  33 #include <linux/init.h>
  34 #include <linux/elf.h>
  35 #include <linux/elf-fdpic.h>
  36 #include <linux/elfcore.h>
  37
  38 #include <asm/uaccess.h>
  39 #include <asm/param.h>
  40 #include <asm/pgalloc.h>
  41
  42 typedef char *elf_caddr_t;
  43
  44 #if 0
  45 #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
  46 #else
  47 #define kdebug(fmt, ...) do {} while(0)
  48 #endif
  49
  50 #if 0
  51 #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
  52 #else
  53 #define kdcore(fmt, ...) do {} while(0)
  54 #endif
  55
  56 MODULE_LICENSE("GPL");
  57
  58 static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *);
  59 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *);
  60 static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *,
  61                               struct mm_struct *, const char *);
  62
  63 static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *,
  64                                    struct elf_fdpic_params *,
  65                                    struct elf_fdpic_params *);
  66
  67 #ifndef CONFIG_MMU
  68 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *,
  69                                             unsigned long *);
  70 static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
  71                                                    struct file *,
  72                                                    struct mm_struct *);
  73 #endif
  74
  75 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
  76                                              struct file *, struct mm_struct *);
  77
  78 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
  79 static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *, unsigned long limit);
  80 #endif
  81
  82 static struct linux_binfmt elf_fdpic_format = {
  83         .module         = THIS_MODULE,
  84         .load_binary    = load_elf_fdpic_binary,
  85 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
  86         .core_dump      = elf_fdpic_core_dump,
  87 #endif
  88         .min_coredump   = ELF_EXEC_PAGESIZE,
  89 };
  90
  91 static int __init init_elf_fdpic_binfmt(void)
  92 {
  93         return register_binfmt(&elf_fdpic_format);
  94 }
  95
  96 static void __exit exit_elf_fdpic_binfmt(void)
  97 {
  98         unregister_binfmt(&elf_fdpic_format);
  99 }
 100
 101 core_initcall(init_elf_fdpic_binfmt);
 102 module_exit(exit_elf_fdpic_binfmt);
 103
 104 static int is_elf_fdpic(struct elfhdr *hdr, struct file *file)
 105 {
 106         if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0)
 107                 return 0;
 108         if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)
 109                 return 0;
 110         if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr))
 111                 return 0;
 112         if (!file->f_op || !file->f_op->mmap)
 113                 return 0;
 114         return 1;
 115 }
 116
 117 /*****************************************************************************/
 118 /*
 119  * read the program headers table into memory
 120  */
 121 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
 122                                  struct file *file)
 123 {
 124         struct elf32_phdr *phdr;
 125         unsigned long size;
 126         int retval, loop;
 127
 128         if (params->hdr.e_phentsize != sizeof(struct elf_phdr))
 129                 return -ENOMEM;
 130         if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr))
 131                 return -ENOMEM;
 132
 133         size = params->hdr.e_phnum * sizeof(struct elf_phdr);
 134         params->phdrs = kmalloc(size, GFP_KERNEL);
 135         if (!params->phdrs)
 136                 return -ENOMEM;
 137
 138         retval = kernel_read(file, params->hdr.e_phoff,
 139                              (char *) params->phdrs, size);
 140         if (unlikely(retval != size))
 141                 return retval < 0 ? retval : -ENOEXEC;
 142
 143         /* determine stack size for this binary */
 144         phdr = params->phdrs;
 145         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 146                 if (phdr->p_type != PT_GNU_STACK)
 147                         continue;
 148
 149                 if (phdr->p_flags & PF_X)
 150                         params->flags |= ELF_FDPIC_FLAG_EXEC_STACK;
 151                 else
 152                         params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK;
 153
 154                 params->stack_size = phdr->p_memsz;
 155                 break;
 156         }
 157
 158         return 0;
 159 }
 160
 161 /*****************************************************************************/
 162 /*
 163  * load an fdpic binary into various bits of memory
 164  */
 165 static int load_elf_fdpic_binary(struct linux_binprm *bprm,
 166                                  struct pt_regs *regs)
 167 {
 168         struct elf_fdpic_params exec_params, interp_params;
 169         struct elf_phdr *phdr;
 170         unsigned long stack_size, entryaddr;
 171 #ifdef ELF_FDPIC_PLAT_INIT
 172         unsigned long dynaddr;
 173 #endif
 174 #ifndef CONFIG_MMU
 175         unsigned long stack_prot;
 176 #endif
 177         struct file *interpreter = NULL; /* to shut gcc up */
 178         char *interpreter_name = NULL;
 179         int executable_stack;
 180         int retval, i;
 181
 182         kdebug("____ LOAD %d ____", current->pid);
 183
 184         memset(&exec_params, 0, sizeof(exec_params));
 185         memset(&interp_params, 0, sizeof(interp_params));
 186
 187         exec_params.hdr = *(struct elfhdr *) bprm->buf;
 188         exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE;
 189
 190         /* check that this is a binary we know how to deal with */
 191         retval = -ENOEXEC;
 192         if (!is_elf_fdpic(&exec_params.hdr, bprm->file))
 193                 goto error;
 194
 195         /* read the program header table */
 196         retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file);
 197         if (retval < 0)
 198                 goto error;
 199
 200         /* scan for a program header that specifies an interpreter */
 201         phdr = exec_params.phdrs;
 202
 203         for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) {
 204                 switch (phdr->p_type) {
 205                 case PT_INTERP:
 206                         retval = -ENOMEM;
 207                         if (phdr->p_filesz > PATH_MAX)
 208                                 goto error;
 209                         retval = -ENOENT;
 210                         if (phdr->p_filesz < 2)
 211                                 goto error;
 212
 213                         /* read the name of the interpreter into memory */
 214                         interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL);
 215                         if (!interpreter_name)
 216                                 goto error;
 217
 218                         retval = kernel_read(bprm->file,
 219                                              phdr->p_offset,
 220                                              interpreter_name,
 221                                              phdr->p_filesz);
 222                         if (unlikely(retval != phdr->p_filesz)) {
 223                                 if (retval >= 0)
 224                                         retval = -ENOEXEC;
 225                                 goto error;
 226                         }
 227
 228                         retval = -ENOENT;
 229                         if (interpreter_name[phdr->p_filesz - 1] != '\0')
 230                                 goto error;
 231
 232                         kdebug("Using ELF interpreter %s", interpreter_name);
 233
 234                         /* replace the program with the interpreter */
 235                         interpreter = open_exec(interpreter_name);
 236                         retval = PTR_ERR(interpreter);
 237                         if (IS_ERR(interpreter)) {
 238                                 interpreter = NULL;
 239                                 goto error;
 240                         }
 241
 242                         /*
 243                          * If the binary is not readable then enforce
 244                          * mm->dumpable = 0 regardless of the interpreter's
 245                          * permissions.
 246                          */
 247                         if (file_permission(interpreter, MAY_READ) < 0)
 248                                 bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
 249
 250                         retval = kernel_read(interpreter, 0, bprm->buf,
 251                                              BINPRM_BUF_SIZE);
 252                         if (unlikely(retval != BINPRM_BUF_SIZE)) {
 253                                 if (retval >= 0)
 254                                         retval = -ENOEXEC;
 255                                 goto error;
 256                         }
 257
 258                         interp_params.hdr = *((struct elfhdr *) bprm->buf);
 259                         break;
 260
 261                 case PT_LOAD:
 262 #ifdef CONFIG_MMU
 263                         if (exec_params.load_addr == 0)
 264                                 exec_params.load_addr = phdr->p_vaddr;
 265 #endif
 266                         break;
 267                 }
 268
 269         }
 270
 271         if (elf_check_const_displacement(&exec_params.hdr))
 272                 exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
 273
 274         /* perform insanity checks on the interpreter */
 275         if (interpreter_name) {
 276                 retval = -ELIBBAD;
 277                 if (!is_elf_fdpic(&interp_params.hdr, interpreter))
 278                         goto error;
 279
 280                 interp_params.flags = ELF_FDPIC_FLAG_PRESENT;
 281
 282                 /* read the interpreter's program header table */
 283                 retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter);
 284                 if (retval < 0)
 285                         goto error;
 286         }
 287
 288         stack_size = exec_params.stack_size;
 289         if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
 290                 executable_stack = EXSTACK_ENABLE_X;
 291         else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
 292                 executable_stack = EXSTACK_DISABLE_X;
 293         else
 294                 executable_stack = EXSTACK_DEFAULT;
 295
 296         if (stack_size == 0) {
 297                 stack_size = interp_params.stack_size;
 298                 if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
 299                         executable_stack = EXSTACK_ENABLE_X;
 300                 else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
 301                         executable_stack = EXSTACK_DISABLE_X;
 302                 else
 303                         executable_stack = EXSTACK_DEFAULT;
 304         }
 305
 306         retval = -ENOEXEC;
 307         if (stack_size == 0)
 308                 goto error;
 309
 310         if (elf_check_const_displacement(&interp_params.hdr))
 311                 interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
 312
 313         /* flush all traces of the currently running executable */
 314         retval = flush_old_exec(bprm);
 315         if (retval)
 316                 goto error;
 317
 318         /* there's now no turning back... the old userspace image is dead,
 319          * defunct, deceased, etc. after this point we have to exit via
 320          * error_kill */
 321         set_personality(PER_LINUX_FDPIC);
 322         if (elf_read_implies_exec(&exec_params.hdr, executable_stack))
 323                 current->personality |= READ_IMPLIES_EXEC;
 324
 325         setup_new_exec(bprm);
 326
 327         set_binfmt(&elf_fdpic_format);
 328
 329         current->mm->start_code = 0;
 330         current->mm->end_code = 0;
 331         current->mm->start_stack = 0;
 332         current->mm->start_data = 0;
 333         current->mm->end_data = 0;
 334         current->mm->context.exec_fdpic_loadmap = 0;
 335         current->mm->context.interp_fdpic_loadmap = 0;
 336
 337         current->flags &= ~PF_FORKNOEXEC;
 338
 339 #ifdef CONFIG_MMU
 340         elf_fdpic_arch_lay_out_mm(&exec_params,
 341                                   &interp_params,
 342                                   &current->mm->start_stack,
 343                                   &current->mm->start_brk);
 344
 345         retval = setup_arg_pages(bprm, current->mm->start_stack,
 346                                  executable_stack);
 347         if (retval < 0) {
 348                 send_sig(SIGKILL, current, 0);
 349                 goto error_kill;
 350         }
 351 #endif
 352
 353         /* load the executable and interpreter into memory */
 354         retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
 355                                     "executable");
 356         if (retval < 0)
 357                 goto error_kill;
 358
 359         if (interpreter_name) {
 360                 retval = elf_fdpic_map_file(&interp_params, interpreter,
 361                                             current->mm, "interpreter");
 362                 if (retval < 0) {
 363                         printk(KERN_ERR "Unable to load interpreter\n");
 364                         goto error_kill;
 365                 }
 366
 367                 allow_write_access(interpreter);
 368                 fput(interpreter);
 369                 interpreter = NULL;
 370         }
 371
 372 #ifdef CONFIG_MMU
 373         if (!current->mm->start_brk)
 374                 current->mm->start_brk = current->mm->end_data;
 375
 376         current->mm->brk = current->mm->start_brk =
 377                 PAGE_ALIGN(current->mm->start_brk);
 378
 379 #else
 380         /* create a stack and brk area big enough for everyone
 381          * - the brk heap starts at the bottom and works up
 382          * - the stack starts at the top and works down
 383          */
 384         stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
 385         if (stack_size < PAGE_SIZE * 2)
 386                 stack_size = PAGE_SIZE * 2;
 387
 388         stack_prot = PROT_READ | PROT_WRITE;
 389         if (executable_stack == EXSTACK_ENABLE_X ||
 390             (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC))
 391                 stack_prot |= PROT_EXEC;
 392
 393         down_write(&current->mm->mmap_sem);
 394         current->mm->start_brk = do_mmap(NULL, 0, stack_size, stack_prot,
 395                                          MAP_PRIVATE | MAP_ANONYMOUS | MAP_GROWSDOWN,
 396                                          0);
 397
 398         if (IS_ERR_VALUE(current->mm->start_brk)) {
 399                 up_write(&current->mm->mmap_sem);
 400                 retval = current->mm->start_brk;
 401                 current->mm->start_brk = 0;
 402                 goto error_kill;
 403         }
 404
 405         up_write(&current->mm->mmap_sem);
 406
 407         current->mm->brk = current->mm->start_brk;
 408         current->mm->context.end_brk = current->mm->start_brk;
 409         current->mm->context.end_brk +=
 410                 (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0;
 411         current->mm->start_stack = current->mm->start_brk + stack_size;
 412 #endif
 413
 414         install_exec_creds(bprm);
 415         current->flags &= ~PF_FORKNOEXEC;
 416         if (create_elf_fdpic_tables(bprm, current->mm,
 417                                     &exec_params, &interp_params) < 0)
 418                 goto error_kill;
 419
 420         kdebug("- start_code  %lx", current->mm->start_code);
 421         kdebug("- end_code    %lx", current->mm->end_code);
 422         kdebug("- start_data  %lx", current->mm->start_data);
 423         kdebug("- end_data    %lx", current->mm->end_data);
 424         kdebug("- start_brk   %lx", current->mm->start_brk);
 425         kdebug("- brk         %lx", current->mm->brk);
 426         kdebug("- start_stack %lx", current->mm->start_stack);
 427
 428 #ifdef ELF_FDPIC_PLAT_INIT
 429         /*
 430          * The ABI may specify that certain registers be set up in special
 431          * ways (on i386 %edx is the address of a DT_FINI function, for
 432          * example.  This macro performs whatever initialization to
 433          * the regs structure is required.
 434          */
 435         dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;
 436         ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,
 437                             dynaddr);
 438 #endif
 439
 440         /* everything is now ready... get the userspace context ready to roll */
 441         entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
 442         start_thread(regs, entryaddr, current->mm->start_stack);
 443
 444         retval = 0;
 445
 446 error:
 447         if (interpreter) {
 448                 allow_write_access(interpreter);
 449                 fput(interpreter);
 450         }
 451         kfree(interpreter_name);
 452         kfree(exec_params.phdrs);
 453         kfree(exec_params.loadmap);
 454         kfree(interp_params.phdrs);
 455         kfree(interp_params.loadmap);
 456         return retval;
 457
 458         /* unrecoverable error - kill the process */
 459 error_kill:
 460         send_sig(SIGSEGV, current, 0);
 461         goto error;
 462
 463 }
 464
 465 /*****************************************************************************/
 466
 467 #ifndef ELF_BASE_PLATFORM
 468 /*
 469  * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
 470  * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
 471  * will be copied to the user stack in the same manner as AT_PLATFORM.
 472  */
 473 #define ELF_BASE_PLATFORM NULL
 474 #endif
 475
 476 /*
 477  * present useful information to the program by shovelling it onto the new
 478  * process's stack
 479  */
 480 static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 481                                    struct mm_struct *mm,
 482                                    struct elf_fdpic_params *exec_params,
 483                                    struct elf_fdpic_params *interp_params)
 484 {
 485         const struct cred *cred = current_cred();
 486         unsigned long sp, csp, nitems;
 487         elf_caddr_t __user *argv, *envp;
 488         size_t platform_len = 0, len;
 489         char *k_platform, *k_base_platform;
 490         char __user *u_platform, *u_base_platform, *p;
 491         long hwcap;
 492         int loop;
 493         int nr; /* reset for each csp adjustment */
 494
 495 #ifdef CONFIG_MMU
 496         /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
 497          * by the processes running on the same package. One thing we can do is
 498          * to shuffle the initial stack for them, so we give the architecture
 499          * an opportunity to do so here.
 500          */
 501         sp = arch_align_stack(bprm->p);
 502 #else
 503         sp = mm->start_stack;
 504
 505         /* stack the program arguments and environment */
 506         if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0)
 507                 return -EFAULT;
 508 #endif
 509
 510         hwcap = ELF_HWCAP;
 511
 512         /*
 513          * If this architecture has a platform capability string, copy it
 514          * to userspace.  In some cases (Sparc), this info is impossible
 515          * for userspace to get any other way, in others (i386) it is
 516          * merely difficult.
 517          */
 518         k_platform = ELF_PLATFORM;
 519         u_platform = NULL;
 520
 521         if (k_platform) {
 522                 platform_len = strlen(k_platform) + 1;
 523                 sp -= platform_len;
 524                 u_platform = (char __user *) sp;
 525                 if (__copy_to_user(u_platform, k_platform, platform_len) != 0)
 526                         return -EFAULT;
 527         }
 528
 529         /*
 530          * If this architecture has a "base" platform capability
 531          * string, copy it to userspace.
 532          */
 533         k_base_platform = ELF_BASE_PLATFORM;
 534         u_base_platform = NULL;
 535
 536         if (k_base_platform) {
 537                 platform_len = strlen(k_base_platform) + 1;
 538                 sp -= platform_len;
 539                 u_base_platform = (char __user *) sp;
 540                 if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0)
 541                         return -EFAULT;
 542         }
 543
 544         sp &= ~7UL;
 545
 546         /* stack the load map(s) */
 547         len = sizeof(struct elf32_fdpic_loadmap);
 548         len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs;
 549         sp = (sp - len) & ~7UL;
 550         exec_params->map_addr = sp;
 551
 552         if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)
 553                 return -EFAULT;
 554
 555         current->mm->context.exec_fdpic_loadmap = (unsigned long) sp;
 556
 557         if (interp_params->loadmap) {
 558                 len = sizeof(struct elf32_fdpic_loadmap);
 559                 len += sizeof(struct elf32_fdpic_loadseg) *
 560                         interp_params->loadmap->nsegs;
 561                 sp = (sp - len) & ~7UL;
 562                 interp_params->map_addr = sp;
 563
 564                 if (copy_to_user((void __user *) sp, interp_params->loadmap,
 565                                  len) != 0)
 566                         return -EFAULT;
 567
 568                 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
 569         }
 570
 571         /* force 16 byte _final_ alignment here for generality */
 572 #define DLINFO_ITEMS 15
 573
 574         nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +
 575                 (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
 576
 577         if (bprm->interp_flags & BINPRM_FLAGS_EXECFD)
 578                 nitems++;
 579
 580         csp = sp;
 581         sp -= nitems * 2 * sizeof(unsigned long);
 582         sp -= (bprm->envc + 1) * sizeof(char *);        /* envv[] */
 583         sp -= (bprm->argc + 1) * sizeof(char *);        /* argv[] */
 584         sp -= 1 * sizeof(unsigned long);                /* argc */
 585
 586         csp -= sp & 15UL;
 587         sp -= sp & 15UL;
 588
 589         /* put the ELF interpreter info on the stack */
 590 #define NEW_AUX_ENT(id, val)                                            \
 591         do {                                                            \
 592                 struct { unsigned long _id, _val; } __user *ent;        \
 593                                                                         \
 594                 ent = (void __user *) csp;                              \
 595                 __put_user((id), &ent[nr]._id);                         \
 596                 __put_user((val), &ent[nr]._val);                       \
 597                 nr++;                                                   \
 598         } while (0)
 599
 600         nr = 0;
 601         csp -= 2 * sizeof(unsigned long);
 602         NEW_AUX_ENT(AT_NULL, 0);
 603         if (k_platform) {
 604                 nr = 0;
 605                 csp -= 2 * sizeof(unsigned long);
 606                 NEW_AUX_ENT(AT_PLATFORM,
 607                             (elf_addr_t) (unsigned long) u_platform);
 608         }
 609
 610         if (k_base_platform) {
 611                 nr = 0;
 612                 csp -= 2 * sizeof(unsigned long);
 613                 NEW_AUX_ENT(AT_BASE_PLATFORM,
 614                             (elf_addr_t) (unsigned long) u_base_platform);
 615         }
 616
 617         if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
 618                 nr = 0;
 619                 csp -= 2 * sizeof(unsigned long);
 620                 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
 621         }
 622
 623         nr = 0;
 624         csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
 625         NEW_AUX_ENT(AT_HWCAP,   hwcap);
 626         NEW_AUX_ENT(AT_PAGESZ,  PAGE_SIZE);
 627         NEW_AUX_ENT(AT_CLKTCK,  CLOCKS_PER_SEC);
 628         NEW_AUX_ENT(AT_PHDR,    exec_params->ph_addr);
 629         NEW_AUX_ENT(AT_PHENT,   sizeof(struct elf_phdr));
 630         NEW_AUX_ENT(AT_PHNUM,   exec_params->hdr.e_phnum);
 631         NEW_AUX_ENT(AT_BASE,    interp_params->elfhdr_addr);
 632         NEW_AUX_ENT(AT_FLAGS,   0);
 633         NEW_AUX_ENT(AT_ENTRY,   exec_params->entry_addr);
 634         NEW_AUX_ENT(AT_UID,     (elf_addr_t) cred->uid);
 635         NEW_AUX_ENT(AT_EUID,    (elf_addr_t) cred->euid);
 636         NEW_AUX_ENT(AT_GID,     (elf_addr_t) cred->gid);
 637         NEW_AUX_ENT(AT_EGID,    (elf_addr_t) cred->egid);
 638         NEW_AUX_ENT(AT_SECURE,  security_bprm_secureexec(bprm));
 639         NEW_AUX_ENT(AT_EXECFN,  bprm->exec);
 640
 641 #ifdef ARCH_DLINFO
 642         nr = 0;
 643         csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long);
 644
 645         /* ARCH_DLINFO must come last so platform specific code can enforce
 646          * special alignment requirements on the AUXV if necessary (eg. PPC).
 647          */
 648         ARCH_DLINFO;
 649 #endif
 650 #undef NEW_AUX_ENT
 651
 652         /* allocate room for argv[] and envv[] */
 653         csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);
 654         envp = (elf_caddr_t __user *) csp;
 655         csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);
 656         argv = (elf_caddr_t __user *) csp;
 657
 658         /* stack argc */
 659         csp -= sizeof(unsigned long);
 660         __put_user(bprm->argc, (unsigned long __user *) csp);
 661
 662         BUG_ON(csp != sp);
 663
 664         /* fill in the argv[] array */
 665 #ifdef CONFIG_MMU
 666         current->mm->arg_start = bprm->p;
 667 #else
 668         current->mm->arg_start = current->mm->start_stack -
 669                 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
 670 #endif
 671
 672         p = (char __user *) current->mm->arg_start;
 673         for (loop = bprm->argc; loop > 0; loop--) {
 674                 __put_user((elf_caddr_t) p, argv++);
 675                 len = strnlen_user(p, MAX_ARG_STRLEN);
 676                 if (!len || len > MAX_ARG_STRLEN)
 677                         return -EINVAL;
 678                 p += len;
 679         }
 680         __put_user(NULL, argv);
 681         current->mm->arg_end = (unsigned long) p;
 682
 683         /* fill in the envv[] array */
 684         current->mm->env_start = (unsigned long) p;
 685         for (loop = bprm->envc; loop > 0; loop--) {
 686                 __put_user((elf_caddr_t)(unsigned long) p, envp++);
 687                 len = strnlen_user(p, MAX_ARG_STRLEN);
 688                 if (!len || len > MAX_ARG_STRLEN)
 689                         return -EINVAL;
 690                 p += len;
 691         }
 692         __put_user(NULL, envp);
 693         current->mm->env_end = (unsigned long) p;
 694
 695         mm->start_stack = (unsigned long) sp;
 696         return 0;
 697 }
 698
 699 /*****************************************************************************/
 700 /*
 701  * transfer the program arguments and environment from the holding pages onto
 702  * the stack
 703  */
 704 #ifndef CONFIG_MMU
 705 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm,
 706                                             unsigned long *_sp)
 707 {
 708         unsigned long index, stop, sp;
 709         char *src;
 710         int ret = 0;
 711
 712         stop = bprm->p >> PAGE_SHIFT;
 713         sp = *_sp;
 714
 715         for (index = MAX_ARG_PAGES - 1; index >= stop; index--) {
 716                 src = kmap(bprm->page[index]);
 717                 sp -= PAGE_SIZE;
 718                 if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0)
 719                         ret = -EFAULT;
 720                 kunmap(bprm->page[index]);
 721                 if (ret < 0)
 722                         goto out;
 723         }
 724
 725         *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15;
 726
 727 out:
 728         return ret;
 729 }
 730 #endif
 731
 732 /*****************************************************************************/
 733 /*
 734  * load the appropriate binary image (executable or interpreter) into memory
 735  * - we assume no MMU is available
 736  * - if no other PIC bits are set in params->hdr->e_flags
 737  *   - we assume that the LOADable segments in the binary are independently relocatable
 738  *   - we assume R/O executable segments are shareable
 739  * - else
 740  *   - we assume the loadable parts of the image to require fixed displacement
 741  *   - the image is not shareable
 742  */
 743 static int elf_fdpic_map_file(struct elf_fdpic_params *params,
 744                               struct file *file,
 745                               struct mm_struct *mm,
 746                               const char *what)
 747 {
 748         struct elf32_fdpic_loadmap *loadmap;
 749 #ifdef CONFIG_MMU
 750         struct elf32_fdpic_loadseg *mseg;
 751 #endif
 752         struct elf32_fdpic_loadseg *seg;
 753         struct elf32_phdr *phdr;
 754         unsigned long load_addr, stop;
 755         unsigned nloads, tmp;
 756         size_t size;
 757         int loop, ret;
 758
 759         /* allocate a load map table */
 760         nloads = 0;
 761         for (loop = 0; loop < params->hdr.e_phnum; loop++)
 762                 if (params->phdrs[loop].p_type == PT_LOAD)
 763                         nloads++;
 764
 765         if (nloads == 0)
 766                 return -ELIBBAD;
 767
 768         size = sizeof(*loadmap) + nloads * sizeof(*seg);
 769         loadmap = kzalloc(size, GFP_KERNEL);
 770         if (!loadmap)
 771                 return -ENOMEM;
 772
 773         params->loadmap = loadmap;
 774
 775         loadmap->version = ELF32_FDPIC_LOADMAP_VERSION;
 776         loadmap->nsegs = nloads;
 777
 778         load_addr = params->load_addr;
 779         seg = loadmap->segs;
 780
 781         /* map the requested LOADs into the memory space */
 782         switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
 783         case ELF_FDPIC_FLAG_CONSTDISP:
 784         case ELF_FDPIC_FLAG_CONTIGUOUS:
 785 #ifndef CONFIG_MMU
 786                 ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm);
 787                 if (ret < 0)
 788                         return ret;
 789                 break;
 790 #endif
 791         default:
 792                 ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm);
 793                 if (ret < 0)
 794                         return ret;
 795                 break;
 796         }
 797
 798         /* map the entry point */
 799         if (params->hdr.e_entry) {
 800                 seg = loadmap->segs;
 801                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
 802                         if (params->hdr.e_entry >= seg->p_vaddr &&
 803                             params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
 804                                 params->entry_addr =
 805                                         (params->hdr.e_entry - seg->p_vaddr) +
 806                                         seg->addr;
 807                                 break;
 808                         }
 809                 }
 810         }
 811
 812         /* determine where the program header table has wound up if mapped */
 813         stop = params->hdr.e_phoff;
 814         stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
 815         phdr = params->phdrs;
 816
 817         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 818                 if (phdr->p_type != PT_LOAD)
 819                         continue;
 820
 821                 if (phdr->p_offset > params->hdr.e_phoff ||
 822                     phdr->p_offset + phdr->p_filesz < stop)
 823                         continue;
 824
 825                 seg = loadmap->segs;
 826                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
 827                         if (phdr->p_vaddr >= seg->p_vaddr &&
 828                             phdr->p_vaddr + phdr->p_filesz <=
 829                             seg->p_vaddr + seg->p_memsz) {
 830                                 params->ph_addr =
 831                                         (phdr->p_vaddr - seg->p_vaddr) +
 832                                         seg->addr +
 833                                         params->hdr.e_phoff - phdr->p_offset;
 834                                 break;
 835                         }
 836                 }
 837                 break;
 838         }
 839
 840         /* determine where the dynamic section has wound up if there is one */
 841         phdr = params->phdrs;
 842         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 843                 if (phdr->p_type != PT_DYNAMIC)
 844                         continue;
 845
 846                 seg = loadmap->segs;
 847                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
 848                         if (phdr->p_vaddr >= seg->p_vaddr &&
 849                             phdr->p_vaddr + phdr->p_memsz <=
 850                             seg->p_vaddr + seg->p_memsz) {
 851                                 params->dynamic_addr =
 852                                         (phdr->p_vaddr - seg->p_vaddr) +
 853                                         seg->addr;
 854
 855                                 /* check the dynamic section contains at least
 856                                  * one item, and that the last item is a NULL
 857                                  * entry */
 858                                 if (phdr->p_memsz == 0 ||
 859                                     phdr->p_memsz % sizeof(Elf32_Dyn) != 0)
 860                                         goto dynamic_error;
 861
 862                                 tmp = phdr->p_memsz / sizeof(Elf32_Dyn);
 863                                 if (((Elf32_Dyn *)
 864                                      params->dynamic_addr)[tmp - 1].d_tag != 0)
 865                                         goto dynamic_error;
 866                                 break;
 867                         }
 868                 }
 869                 break;
 870         }
 871
 872         /* now elide adjacent segments in the load map on MMU linux
 873          * - on uClinux the holes between may actually be filled with system
 874          *   stuff or stuff from other processes
 875          */
 876 #ifdef CONFIG_MMU
 877         nloads = loadmap->nsegs;
 878         mseg = loadmap->segs;
 879         seg = mseg + 1;
 880         for (loop = 1; loop < nloads; loop++) {
 881                 /* see if we have a candidate for merging */
 882                 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {
 883                         load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);
 884                         if (load_addr == (seg->addr & PAGE_MASK)) {
 885                                 mseg->p_memsz +=
 886                                         load_addr -
 887                                         (mseg->addr + mseg->p_memsz);
 888                                 mseg->p_memsz += seg->addr & ~PAGE_MASK;
 889                                 mseg->p_memsz += seg->p_memsz;
 890                                 loadmap->nsegs--;
 891                                 continue;
 892                         }
 893                 }
 894
 895                 mseg++;
 896                 if (mseg != seg)
 897                         *mseg = *seg;
 898         }
 899 #endif
 900
 901         kdebug("Mapped Object [%s]:", what);
 902         kdebug("- elfhdr   : %lx", params->elfhdr_addr);
 903         kdebug("- entry    : %lx", params->entry_addr);
 904         kdebug("- PHDR[]   : %lx", params->ph_addr);
 905         kdebug("- DYNAMIC[]: %lx", params->dynamic_addr);
 906         seg = loadmap->segs;
 907         for (loop = 0; loop < loadmap->nsegs; loop++, seg++)
 908                 kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]",
 909                        loop,
 910                        seg->addr, seg->addr + seg->p_memsz - 1,
 911                        seg->p_vaddr, seg->p_memsz);
 912
 913         return 0;
 914
 915 dynamic_error:
 916         printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n",
 917                what, file->f_path.dentry->d_inode->i_ino);
 918         return -ELIBBAD;
 919 }
 920
 921 /*****************************************************************************/
 922 /*
 923  * map a file with constant displacement under uClinux
 924  */
 925 #ifndef CONFIG_MMU
 926 static int elf_fdpic_map_file_constdisp_on_uclinux(
 927         struct elf_fdpic_params *params,
 928         struct file *file,
 929         struct mm_struct *mm)
 930 {
 931         struct elf32_fdpic_loadseg *seg;
 932         struct elf32_phdr *phdr;
 933         unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags;
 934         loff_t fpos;
 935         int loop, ret;
 936
 937         load_addr = params->load_addr;
 938         seg = params->loadmap->segs;
 939
 940         /* determine the bounds of the contiguous overall allocation we must
 941          * make */
 942         phdr = params->phdrs;
 943         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 944                 if (params->phdrs[loop].p_type != PT_LOAD)
 945                         continue;
 946
 947                 if (base > phdr->p_vaddr)
 948                         base = phdr->p_vaddr;
 949                 if (top < phdr->p_vaddr + phdr->p_memsz)
 950                         top = phdr->p_vaddr + phdr->p_memsz;
 951         }
 952
 953         /* allocate one big anon block for everything */
 954         mflags = MAP_PRIVATE;
 955         if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
 956                 mflags |= MAP_EXECUTABLE;
 957
 958         down_write(&mm->mmap_sem);
 959         maddr = do_mmap(NULL, load_addr, top - base,
 960                         PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0);
 961         up_write(&mm->mmap_sem);
 962         if (IS_ERR_VALUE(maddr))
 963                 return (int) maddr;
 964
 965         if (load_addr != 0)
 966                 load_addr += PAGE_ALIGN(top - base);
 967
 968         /* and then load the file segments into it */
 969         phdr = params->phdrs;
 970         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 971                 if (params->phdrs[loop].p_type != PT_LOAD)
 972                         continue;
 973
 974                 fpos = phdr->p_offset;
 975
 976                 seg->addr = maddr + (phdr->p_vaddr - base);
 977                 seg->p_vaddr = phdr->p_vaddr;
 978                 seg->p_memsz = phdr->p_memsz;
 979
 980                 ret = file->f_op->read(file, (void *) seg->addr,
 981                                        phdr->p_filesz, &fpos);
 982                 if (ret < 0)
 983                         return ret;
 984
 985                 /* map the ELF header address if in this segment */
 986                 if (phdr->p_offset == 0)
 987                         params->elfhdr_addr = seg->addr;
 988
 989                 /* clear any space allocated but not loaded */
 990                 if (phdr->p_filesz < phdr->p_memsz) {
 991                         ret = clear_user((void *) (seg->addr + phdr->p_filesz),
 992                                          phdr->p_memsz - phdr->p_filesz);
 993                         if (ret)
 994                                 return ret;
 995                 }
 996
 997                 if (mm) {
 998                         if (phdr->p_flags & PF_X) {
 999                                 if (!mm->start_code) {
1000                                         mm->start_code = seg->addr;
1001                                         mm->end_code = seg->addr +
1002                                                 phdr->p_memsz;
1003                                 }
1004                         } else if (!mm->start_data) {
1005                                 mm->start_data = seg->addr;
1006 #ifndef CONFIG_MMU
1007                                 mm->end_data = seg->addr + phdr->p_memsz;
1008 #endif
1009                         }
1010
1011 #ifdef CONFIG_MMU
1012                         if (seg->addr + phdr->p_memsz > mm->end_data)
1013                                 mm->end_data = seg->addr + phdr->p_memsz;
1014 #endif
1015                 }
1016
1017                 seg++;
1018         }
1019
1020         return 0;
1021 }
1022 #endif
1023
1024 /*****************************************************************************/
1025 /*
1026  * map a binary by direct mmap() of the individual PT_LOAD segments
1027  */
1028 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1029                                              struct file *file,
1030                                              struct mm_struct *mm)
1031 {
1032         struct elf32_fdpic_loadseg *seg;
1033         struct elf32_phdr *phdr;
1034         unsigned long load_addr, delta_vaddr;
1035         int loop, dvset, ret;
1036
1037         load_addr = params->load_addr;
1038         delta_vaddr = 0;
1039         dvset = 0;
1040
1041         seg = params->loadmap->segs;
1042
1043         /* deal with each load segment separately */
1044         phdr = params->phdrs;
1045         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
1046                 unsigned long maddr, disp, excess, excess1;
1047                 int prot = 0, flags;
1048
1049                 if (phdr->p_type != PT_LOAD)
1050                         continue;
1051
1052                 kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx",
1053                        (unsigned long) phdr->p_vaddr,
1054                        (unsigned long) phdr->p_offset,
1055                        (unsigned long) phdr->p_filesz,
1056                        (unsigned long) phdr->p_memsz);
1057
1058                 /* determine the mapping parameters */
1059                 if (phdr->p_flags & PF_R) prot |= PROT_READ;
1060                 if (phdr->p_flags & PF_W) prot |= PROT_WRITE;
1061                 if (phdr->p_flags & PF_X) prot |= PROT_EXEC;
1062
1063                 flags = MAP_PRIVATE | MAP_DENYWRITE;
1064                 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
1065                         flags |= MAP_EXECUTABLE;
1066
1067                 maddr = 0;
1068
1069                 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
1070                 case ELF_FDPIC_FLAG_INDEPENDENT:
1071                         /* PT_LOADs are independently locatable */
1072                         break;
1073
1074                 case ELF_FDPIC_FLAG_HONOURVADDR:
1075                         /* the specified virtual address must be honoured */
1076                         maddr = phdr->p_vaddr;
1077                         flags |= MAP_FIXED;
1078                         break;
1079
1080                 case ELF_FDPIC_FLAG_CONSTDISP:
1081                         /* constant displacement
1082                          * - can be mapped anywhere, but must be mapped as a
1083                          *   unit
1084                          */
1085                         if (!dvset) {
1086                                 maddr = load_addr;
1087                                 delta_vaddr = phdr->p_vaddr;
1088                                 dvset = 1;
1089                         } else {
1090                                 maddr = load_addr + phdr->p_vaddr - delta_vaddr;
1091                                 flags |= MAP_FIXED;
1092                         }
1093                         break;
1094
1095                 case ELF_FDPIC_FLAG_CONTIGUOUS:
1096                         /* contiguity handled later */
1097                         break;
1098
1099                 default:
1100                         BUG();
1101                 }
1102
1103                 maddr &= PAGE_MASK;
1104
1105                 /* create the mapping */
1106                 disp = phdr->p_vaddr & ~PAGE_MASK;
1107                 down_write(&mm->mmap_sem);
1108                 maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags,
1109                                 phdr->p_offset - disp);
1110                 up_write(&mm->mmap_sem);
1111
1112                 kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx",
1113                        loop, phdr->p_memsz + disp, prot, flags,
1114                        phdr->p_offset - disp, maddr);
1115
1116                 if (IS_ERR_VALUE(maddr))
1117                         return (int) maddr;
1118
1119                 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
1120                     ELF_FDPIC_FLAG_CONTIGUOUS)
1121                         load_addr += PAGE_ALIGN(phdr->p_memsz + disp);
1122
1123                 seg->addr = maddr + disp;
1124                 seg->p_vaddr = phdr->p_vaddr;
1125                 seg->p_memsz = phdr->p_memsz;
1126
1127                 /* map the ELF header address if in this segment */
1128                 if (phdr->p_offset == 0)
1129                         params->elfhdr_addr = seg->addr;
1130
1131                 /* clear the bit between beginning of mapping and beginning of
1132                  * PT_LOAD */
1133                 if (prot & PROT_WRITE && disp > 0) {
1134                         kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
1135                         ret = clear_user((void __user *) maddr, disp);
1136                         if (ret)
1137                                 return ret;
1138                         maddr += disp;
1139                 }
1140
1141                 /* clear any space allocated but not loaded
1142                  * - on uClinux we can just clear the lot
1143                  * - on MMU linux we'll get a SIGBUS beyond the last page
1144                  *   extant in the file
1145                  */
1146                 excess = phdr->p_memsz - phdr->p_filesz;
1147                 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);
1148
1149 #ifdef CONFIG_MMU
1150                 if (excess > excess1) {
1151                         unsigned long xaddr = maddr + phdr->p_filesz + excess1;
1152                         unsigned long xmaddr;
1153
1154                         flags |= MAP_FIXED | MAP_ANONYMOUS;
1155                         down_write(&mm->mmap_sem);
1156                         xmaddr = do_mmap(NULL, xaddr, excess - excess1,
1157                                          prot, flags, 0);
1158                         up_write(&mm->mmap_sem);
1159
1160                         kdebug("mmap[%d] <anon>"
1161                                " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
1162                                loop, xaddr, excess - excess1, prot, flags,
1163                                xmaddr);
1164
1165                         if (xmaddr != xaddr)
1166                                 return -ENOMEM;
1167                 }
1168
1169                 if (prot & PROT_WRITE && excess1 > 0) {
1170                         kdebug("clear[%d] ad=%lx sz=%lx",
1171                                loop, maddr + phdr->p_filesz, excess1);
1172                         ret = clear_user((void __user *) maddr + phdr->p_filesz,
1173                                          excess1);
1174                         if (ret)
1175                                 return ret;
1176                 }
1177
1178 #else
1179                 if (excess > 0) {
1180                         kdebug("clear[%d] ad=%lx sz=%lx",
1181                                loop, maddr + phdr->p_filesz, excess);
1182                         ret = clear_user((void *) maddr + phdr->p_filesz, excess);
1183                         if (ret)
1184                                 return ret;
1185                 }
1186 #endif
1187
1188                 if (mm) {
1189                         if (phdr->p_flags & PF_X) {
1190                                 if (!mm->start_code) {
1191                                         mm->start_code = maddr;
1192                                         mm->end_code = maddr + phdr->p_memsz;
1193                                 }
1194                         } else if (!mm->start_data) {
1195                                 mm->start_data = maddr;
1196                                 mm->end_data = maddr + phdr->p_memsz;
1197                         }
1198                 }
1199
1200                 seg++;
1201         }
1202
1203         return 0;
1204 }
1205
1206 /*****************************************************************************/
1207 /*
1208  * ELF-FDPIC core dumper
1209  *
1210  * Modelled on fs/exec.c:aout_core_dump()
1211  * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1212  *
1213  * Modelled on fs/binfmt_elf.c core dumper
1214  */
1215 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
1216
1217 /*
1218  * These are the only things you should do on a core-file: use only these
1219  * functions to write out all the necessary info.
1220  */
1221 static int dump_write(struct file *file, const void *addr, int nr)
1222 {
1223         return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
1224 }
1225
1226 static int dump_seek(struct file *file, loff_t off)
1227 {
1228         if (file->f_op->llseek) {
1229                 if (file->f_op->llseek(file, off, SEEK_SET) != off)
1230                         return 0;
1231         } else {
1232                 file->f_pos = off;
1233         }
1234         return 1;
1235 }
1236
1237 /*
1238  * Decide whether a segment is worth dumping; default is yes to be
1239  * sure (missing info is worse than too much; etc).
1240  * Personally I'd include everything, and use the coredump limit...
1241  *
1242  * I think we should skip something. But I am not sure how. H.J.
1243  */
1244 static int maydump(struct vm_area_struct *vma, unsigned long mm_flags)
1245 {
1246         int dump_ok;
1247
1248         /* Do not dump I/O mapped devices or special mappings */
1249         if (vma->vm_flags & (VM_IO | VM_RESERVED)) {
1250                 kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags);
1251                 return 0;
1252         }
1253
1254         /* If we may not read the contents, don't allow us to dump
1255          * them either. "dump_write()" can't handle it anyway.
1256          */
1257         if (!(vma->vm_flags & VM_READ)) {
1258                 kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags);
1259                 return 0;
1260         }
1261
1262         /* By default, dump shared memory if mapped from an anonymous file. */
1263         if (vma->vm_flags & VM_SHARED) {
1264                 if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) {
1265                         dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags);
1266                         kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1267                                vma->vm_flags, dump_ok ? "yes" : "no");
1268                         return dump_ok;
1269                 }
1270
1271                 dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags);
1272                 kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1273                        vma->vm_flags, dump_ok ? "yes" : "no");
1274                 return dump_ok;
1275         }
1276
1277 #ifdef CONFIG_MMU
1278         /* By default, if it hasn't been written to, don't write it out */
1279         if (!vma->anon_vma) {
1280                 dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags);
1281                 kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start,
1282                        vma->vm_flags, dump_ok ? "yes" : "no");
1283                 return dump_ok;
1284         }
1285 #endif
1286
1287         dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags);
1288         kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags,
1289                dump_ok ? "yes" : "no");
1290         return dump_ok;
1291 }
1292
1293 /* An ELF note in memory */
1294 struct memelfnote
1295 {
1296         const char *name;
1297         int type;
1298         unsigned int datasz;
1299         void *data;
1300 };
1301
1302 static int notesize(struct memelfnote *en)
1303 {
1304         int sz;
1305
1306         sz = sizeof(struct elf_note);
1307         sz += roundup(strlen(en->name) + 1, 4);
1308         sz += roundup(en->datasz, 4);
1309
1310         return sz;
1311 }
1312
1313 /* #define DEBUG */
1314
1315 #define DUMP_WRITE(addr, nr)    \
1316         do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
1317 #define DUMP_SEEK(off)  \
1318         do { if (!dump_seek(file, (off))) return 0; } while(0)
1319
1320 static int writenote(struct memelfnote *men, struct file *file)
1321 {
1322         struct elf_note en;
1323
1324         en.n_namesz = strlen(men->name) + 1;
1325         en.n_descsz = men->datasz;
1326         en.n_type = men->type;
1327
1328         DUMP_WRITE(&en, sizeof(en));
1329         DUMP_WRITE(men->name, en.n_namesz);
1330         /* XXX - cast from long long to long to avoid need for libgcc.a */
1331         DUMP_SEEK(roundup((unsigned long)file->f_pos, 4));      /* XXX */
1332         DUMP_WRITE(men->data, men->datasz);
1333         DUMP_SEEK(roundup((unsigned long)file->f_pos, 4));      /* XXX */
1334
1335         return 1;
1336 }
1337 #undef DUMP_WRITE
1338 #undef DUMP_SEEK
1339
1340 #define DUMP_WRITE(addr, nr)    \
1341         if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
1342                 goto end_coredump;
1343
1344 static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
1345 {
1346         memcpy(elf->e_ident, ELFMAG, SELFMAG);
1347         elf->e_ident[EI_CLASS] = ELF_CLASS;
1348         elf->e_ident[EI_DATA] = ELF_DATA;
1349         elf->e_ident[EI_VERSION] = EV_CURRENT;
1350         elf->e_ident[EI_OSABI] = ELF_OSABI;
1351         memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1352
1353         elf->e_type = ET_CORE;
1354         elf->e_machine = ELF_ARCH;
1355         elf->e_version = EV_CURRENT;
1356         elf->e_entry = 0;
1357         elf->e_phoff = sizeof(struct elfhdr);
1358         elf->e_shoff = 0;
1359         elf->e_flags = ELF_FDPIC_CORE_EFLAGS;
1360         elf->e_ehsize = sizeof(struct elfhdr);
1361         elf->e_phentsize = sizeof(struct elf_phdr);
1362         elf->e_phnum = segs;
1363         elf->e_shentsize = 0;
1364         elf->e_shnum = 0;
1365         elf->e_shstrndx = 0;
1366         return;
1367 }
1368
1369 static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1370 {
1371         phdr->p_type = PT_NOTE;
1372         phdr->p_offset = offset;
1373         phdr->p_vaddr = 0;
1374         phdr->p_paddr = 0;
1375         phdr->p_filesz = sz;
1376         phdr->p_memsz = 0;
1377         phdr->p_flags = 0;
1378         phdr->p_align = 0;
1379         return;
1380 }
1381
1382 static inline void fill_note(struct memelfnote *note, const char *name, int type,
1383                 unsigned int sz, void *data)
1384 {
1385         note->name = name;
1386         note->type = type;
1387         note->datasz = sz;
1388         note->data = data;
1389         return;
1390 }
1391
1392 /*
1393  * fill up all the fields in prstatus from the given task struct, except
1394  * registers which need to be filled up seperately.
1395  */
1396 static void fill_prstatus(struct elf_prstatus *prstatus,
1397                           struct task_struct *p, long signr)
1398 {
1399         prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1400         prstatus->pr_sigpend = p->pending.signal.sig[0];
1401         prstatus->pr_sighold = p->blocked.sig[0];
1402         rcu_read_lock();
1403         prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1404         rcu_read_unlock();
1405         prstatus->pr_pid = task_pid_vnr(p);
1406         prstatus->pr_pgrp = task_pgrp_vnr(p);
1407         prstatus->pr_sid = task_session_vnr(p);
1408         if (thread_group_leader(p)) {
1409                 struct task_cputime cputime;
1410
1411                 /*
1412                  * This is the record for the group leader.  It shows the
1413                  * group-wide total, not its individual thread total.
1414                  */
1415                 thread_group_cputime(p, &cputime);
1416                 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1417                 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
1418         } else {
1419                 cputime_to_timeval(p->utime, &prstatus->pr_utime);
1420                 cputime_to_timeval(p->stime, &prstatus->pr_stime);
1421         }
1422         cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1423         cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1424
1425         prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
1426         prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
1427 }
1428
1429 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1430                        struct mm_struct *mm)
1431 {
1432         const struct cred *cred;
1433         unsigned int i, len;
1434
1435         /* first copy the parameters from user space */
1436         memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1437
1438         len = mm->arg_end - mm->arg_start;
1439         if (len >= ELF_PRARGSZ)
1440                 len = ELF_PRARGSZ - 1;
1441         if (copy_from_user(&psinfo->pr_psargs,
1442                            (const char __user *) mm->arg_start, len))
1443                 return -EFAULT;
1444         for (i = 0; i < len; i++)
1445                 if (psinfo->pr_psargs[i] == 0)
1446                         psinfo->pr_psargs[i] = ' ';
1447         psinfo->pr_psargs[len] = 0;
1448
1449         rcu_read_lock();
1450         psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1451         rcu_read_unlock();
1452         psinfo->pr_pid = task_pid_vnr(p);
1453         psinfo->pr_pgrp = task_pgrp_vnr(p);
1454         psinfo->pr_sid = task_session_vnr(p);
1455
1456         i = p->state ? ffz(~p->state) + 1 : 0;
1457         psinfo->pr_state = i;
1458         psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1459         psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1460         psinfo->pr_nice = task_nice(p);
1461         psinfo->pr_flag = p->flags;
1462         rcu_read_lock();
1463         cred = __task_cred(p);
1464         SET_UID(psinfo->pr_uid, cred->uid);
1465         SET_GID(psinfo->pr_gid, cred->gid);
1466         rcu_read_unlock();
1467         strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1468
1469         return 0;
1470 }
1471
1472 /* Here is the structure in which status of each thread is captured. */
1473 struct elf_thread_status
1474 {
1475         struct list_head list;
1476         struct elf_prstatus prstatus;   /* NT_PRSTATUS */
1477         elf_fpregset_t fpu;             /* NT_PRFPREG */
1478         struct task_struct *thread;
1479 #ifdef ELF_CORE_COPY_XFPREGS
1480         elf_fpxregset_t xfpu;           /* ELF_CORE_XFPREG_TYPE */
1481 #endif
1482         struct memelfnote notes[3];
1483         int num_notes;
1484 };
1485
1486 /*
1487  * In order to add the specific thread information for the elf file format,
1488  * we need to keep a linked list of every thread's pr_status and then create
1489  * a single section for them in the final core file.
1490  */
1491 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1492 {
1493         struct task_struct *p = t->thread;
1494         int sz = 0;
1495
1496         t->num_notes = 0;
1497
1498         fill_prstatus(&t->prstatus, p, signr);
1499         elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1500
1501         fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1502                   &t->prstatus);
1503         t->num_notes++;
1504         sz += notesize(&t->notes[0]);
1505
1506         t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
1507         if (t->prstatus.pr_fpvalid) {
1508                 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1509                           &t->fpu);
1510                 t->num_notes++;
1511                 sz += notesize(&t->notes[1]);
1512         }
1513
1514 #ifdef ELF_CORE_COPY_XFPREGS
1515         if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1516                 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1517                           sizeof(t->xfpu), &t->xfpu);
1518                 t->num_notes++;
1519                 sz += notesize(&t->notes[2]);
1520         }
1521 #endif
1522         return sz;
1523 }
1524
1525 /*
1526  * dump the segments for an MMU process
1527  */
1528 #ifdef CONFIG_MMU
1529 static int elf_fdpic_dump_segments(struct file *file, size_t *size,
1530                            unsigned long *limit, unsigned long mm_flags)
1531 {
1532         struct vm_area_struct *vma;
1533         int err = 0;
1534
1535         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1536                 unsigned long addr;
1537
1538                 if (!maydump(vma, mm_flags))
1539                         continue;
1540
1541                 for (addr = vma->vm_start; addr < vma->vm_end;
1542                                                         addr += PAGE_SIZE) {
1543                         struct page *page = get_dump_page(addr);
1544                         if (page) {
1545                                 void *kaddr = kmap(page);
1546                                 *size += PAGE_SIZE;
1547                                 if (*size > *limit)
1548                                         err = -EFBIG;
1549                                 else if (!dump_write(file, kaddr, PAGE_SIZE))
1550                                         err = -EIO;
1551                                 kunmap(page);
1552                                 page_cache_release(page);
1553                         } else if (!dump_seek(file, file->f_pos + PAGE_SIZE))
1554                                 err = -EFBIG;
1555                         if (err)
1556                                 goto out;
1557                 }
1558         }
1559 out:
1560         return err;
1561 }
1562 #endif
1563
1564 /*
1565  * dump the segments for a NOMMU process
1566  */
1567 #ifndef CONFIG_MMU
1568 static int elf_fdpic_dump_segments(struct file *file, size_t *size,
1569                            unsigned long *limit, unsigned long mm_flags)
1570 {
1571         struct vm_area_struct *vma;
1572
1573         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1574                 if (!maydump(vma, mm_flags))
1575                         continue;
1576
1577                 if ((*size += PAGE_SIZE) > *limit)
1578                         return -EFBIG;
1579
1580                 if (!dump_write(file, (void *) vma->vm_start,
1581                                 vma->vm_end - vma->vm_start))
1582                         return -EIO;
1583         }
1584
1585         return 0;
1586 }
1587 #endif
1588
1589 /*
1590  * Actual dumper
1591  *
1592  * This is a two-pass process; first we find the offsets of the bits,
1593  * and then they are actually written out.  If we run out of core limit
1594  * we just truncate.
1595  */
1596 static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
1597                                struct file *file, unsigned long limit)
1598 {
1599 #define NUM_NOTES       6
1600         int has_dumped = 0;
1601         mm_segment_t fs;
1602         int segs;
1603         size_t size = 0;
1604         int i;
1605         struct vm_area_struct *vma;
1606         struct elfhdr *elf = NULL;
1607         loff_t offset = 0, dataoff;
1608         int numnote;
1609         struct memelfnote *notes = NULL;
1610         struct elf_prstatus *prstatus = NULL;   /* NT_PRSTATUS */
1611         struct elf_prpsinfo *psinfo = NULL;     /* NT_PRPSINFO */
1612         LIST_HEAD(thread_list);
1613         struct list_head *t;
1614         elf_fpregset_t *fpu = NULL;
1615 #ifdef ELF_CORE_COPY_XFPREGS
1616         elf_fpxregset_t *xfpu = NULL;
1617 #endif
1618         int thread_status_size = 0;
1619         elf_addr_t *auxv;
1620         unsigned long mm_flags;
1621
1622         /*
1623          * We no longer stop all VM operations.
1624          *
1625          * This is because those proceses that could possibly change map_count
1626          * or the mmap / vma pages are now blocked in do_exit on current
1627          * finishing this core dump.
1628          *
1629          * Only ptrace can touch these memory addresses, but it doesn't change
1630          * the map_count or the pages allocated. So no possibility of crashing
1631          * exists while dumping the mm->vm_next areas to the core file.
1632          */
1633
1634         /* alloc memory for large data structures: too large to be on stack */
1635         elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1636         if (!elf)
1637                 goto cleanup;
1638         prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
1639         if (!prstatus)
1640                 goto cleanup;
1641         psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1642         if (!psinfo)
1643                 goto cleanup;
1644         notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1645         if (!notes)
1646                 goto cleanup;
1647         fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1648         if (!fpu)
1649                 goto cleanup;
1650 #ifdef ELF_CORE_COPY_XFPREGS
1651         xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1652         if (!xfpu)
1653                 goto cleanup;
1654 #endif
1655
1656         if (signr) {
1657                 struct core_thread *ct;
1658                 struct elf_thread_status *tmp;
1659
1660                 for (ct = current->mm->core_state->dumper.next;
1661                                                 ct; ct = ct->next) {
1662                         tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
1663                         if (!tmp)
1664                                 goto cleanup;
1665
1666                         tmp->thread = ct->task;
1667                         list_add(&tmp->list, &thread_list);
1668                 }
1669
1670                 list_for_each(t, &thread_list) {
1671                         struct elf_thread_status *tmp;
1672                         int sz;
1673
1674                         tmp = list_entry(t, struct elf_thread_status, list);
1675                         sz = elf_dump_thread_status(signr, tmp);
1676                         thread_status_size += sz;
1677                 }
1678         }
1679
1680         /* now collect the dump for the current */
1681         fill_prstatus(prstatus, current, signr);
1682         elf_core_copy_regs(&prstatus->pr_reg, regs);
1683
1684         segs = current->mm->map_count;
1685 #ifdef ELF_CORE_EXTRA_PHDRS
1686         segs += ELF_CORE_EXTRA_PHDRS;
1687 #endif
1688
1689         /* Set up header */
1690         fill_elf_fdpic_header(elf, segs + 1);   /* including notes section */
1691
1692         has_dumped = 1;
1693         current->flags |= PF_DUMPCORE;
1694
1695         /*
1696          * Set up the notes in similar form to SVR4 core dumps made
1697          * with info from their /proc.
1698          */
1699
1700         fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1701         fill_psinfo(psinfo, current->group_leader, current->mm);
1702         fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1703
1704         numnote = 2;
1705
1706         auxv = (elf_addr_t *) current->mm->saved_auxv;
1707
1708         i = 0;
1709         do
1710                 i += 2;
1711         while (auxv[i - 2] != AT_NULL);
1712         fill_note(&notes[numnote++], "CORE", NT_AUXV,
1713                   i * sizeof(elf_addr_t), auxv);
1714
1715         /* Try to dump the FPU. */
1716         if ((prstatus->pr_fpvalid =
1717              elf_core_copy_task_fpregs(current, regs, fpu)))
1718                 fill_note(notes + numnote++,
1719                           "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1720 #ifdef ELF_CORE_COPY_XFPREGS
1721         if (elf_core_copy_task_xfpregs(current, xfpu))
1722                 fill_note(notes + numnote++,
1723                           "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu);
1724 #endif
1725
1726         fs = get_fs();
1727         set_fs(KERNEL_DS);
1728
1729         DUMP_WRITE(elf, sizeof(*elf));
1730         offset += sizeof(*elf);                         /* Elf header */
1731         offset += (segs+1) * sizeof(struct elf_phdr);   /* Program headers */
1732
1733         /* Write notes phdr entry */
1734         {
1735                 struct elf_phdr phdr;
1736                 int sz = 0;
1737
1738                 for (i = 0; i < numnote; i++)
1739                         sz += notesize(notes + i);
1740
1741                 sz += thread_status_size;
1742
1743                 fill_elf_note_phdr(&phdr, sz, offset);
1744                 offset += sz;
1745                 DUMP_WRITE(&phdr, sizeof(phdr));
1746         }
1747
1748         /* Page-align dumped data */
1749         dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1750
1751         /*
1752          * We must use the same mm->flags while dumping core to avoid
1753          * inconsistency between the program headers and bodies, otherwise an
1754          * unusable core file can be generated.
1755          */
1756         mm_flags = current->mm->flags;
1757
1758         /* write program headers for segments dump */
1759         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1760                 struct elf_phdr phdr;
1761                 size_t sz;
1762
1763                 sz = vma->vm_end - vma->vm_start;
1764
1765                 phdr.p_type = PT_LOAD;
1766                 phdr.p_offset = offset;
1767                 phdr.p_vaddr = vma->vm_start;
1768                 phdr.p_paddr = 0;
1769                 phdr.p_filesz = maydump(vma, mm_flags) ? sz : 0;
1770                 phdr.p_memsz = sz;
1771                 offset += phdr.p_filesz;
1772                 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1773                 if (vma->vm_flags & VM_WRITE)
1774                         phdr.p_flags |= PF_W;
1775                 if (vma->vm_flags & VM_EXEC)
1776                         phdr.p_flags |= PF_X;
1777                 phdr.p_align = ELF_EXEC_PAGESIZE;
1778
1779                 DUMP_WRITE(&phdr, sizeof(phdr));
1780         }
1781
1782 #ifdef ELF_CORE_WRITE_EXTRA_PHDRS
1783         ELF_CORE_WRITE_EXTRA_PHDRS;
1784 #endif
1785
1786         /* write out the notes section */
1787         for (i = 0; i < numnote; i++)
1788                 if (!writenote(notes + i, file))
1789                         goto end_coredump;
1790
1791         /* write out the thread status notes section */
1792         list_for_each(t, &thread_list) {
1793                 struct elf_thread_status *tmp =
1794                                 list_entry(t, struct elf_thread_status, list);
1795
1796                 for (i = 0; i < tmp->num_notes; i++)
1797                         if (!writenote(&tmp->notes[i], file))
1798                                 goto end_coredump;
1799         }
1800
1801         if (!dump_seek(file, dataoff))
1802                 goto end_coredump;
1803
1804         if (elf_fdpic_dump_segments(file, &size, &limit, mm_flags) < 0)
1805                 goto end_coredump;
1806
1807 #ifdef ELF_CORE_WRITE_EXTRA_DATA
1808         ELF_CORE_WRITE_EXTRA_DATA;
1809 #endif
1810
1811         if (file->f_pos != offset) {
1812                 /* Sanity check */
1813                 printk(KERN_WARNING
1814                        "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
1815                        file->f_pos, offset);
1816         }
1817
1818 end_coredump:
1819         set_fs(fs);
1820
1821 cleanup:
1822         while (!list_empty(&thread_list)) {
1823                 struct list_head *tmp = thread_list.next;
1824                 list_del(tmp);
1825                 kfree(list_entry(tmp, struct elf_thread_status, list));
1826         }
1827
1828         kfree(elf);
1829         kfree(prstatus);
1830         kfree(psinfo);
1831         kfree(notes);
1832         kfree(fpu);
1833 #ifdef ELF_CORE_COPY_XFPREGS
1834         kfree(xfpu);
1835 #endif
1836         return has_dumped;
1837 #undef NUM_NOTES
1838 }
1839
1840 #endif          /* USE_ELF_CORE_DUMP */