mm: variable length argument support

[karo-tx-linux.git] / include / linux / binfmts.h

diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index c1e82c51444320f0970162fa76b2065ab3727bf7..91c8c07fe8b73fbf365cd7e4c67dd33a8e349a54 100644 (file)
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -6,23 +6,32 @@
 struct pt_regs;
 
 /*
- * MAX_ARG_PAGES defines the number of pages allocated for arguments
- * and envelope for the new program. 32 should suffice, this gives
- * a maximum env+arg of 128kB w/4KB pages!
+ * These are the maximum length and maximum number of strings passed to the
+ * execve() system call.  MAX_ARG_STRLEN is essentially random but serves to
+ * prevent the kernel from being unduly impacted by misaddressed pointers.
+ * MAX_ARG_STRINGS is chosen to fit in a signed 32-bit integer.
  */
-#define MAX_ARG_PAGES 32
+#define MAX_ARG_STRLEN (PAGE_SIZE * 32)
+#define MAX_ARG_STRINGS 0x7FFFFFFF
 
 /* sizeof(linux_binprm->buf) */
 #define BINPRM_BUF_SIZE 128
 
 #ifdef __KERNEL__
 
+#define CORENAME_MAX_SIZE 128
+
 /*
  * This structure is used to hold the arguments that are used when loading binaries.
  */
 struct linux_binprm{
        char buf[BINPRM_BUF_SIZE];
+#ifdef CONFIG_MMU
+       struct vm_area_struct *vma;
+#else
+# define MAX_ARG_PAGES 32
        struct page *page[MAX_ARG_PAGES];
+#endif
        struct mm_struct *mm;
        unsigned long p; /* current top of mem */
        int sh_bang;
@@ -38,6 +47,7 @@ struct linux_binprm{
        unsigned interp_flags;
        unsigned interp_data;
        unsigned long loader, exec;
+       unsigned long argv_len;
 };
 
 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
@@ -59,13 +69,14 @@ struct linux_binfmt {
        int (*load_shlib)(struct file *);
        int (*core_dump)(long signr, struct pt_regs * regs, struct file * file);
        unsigned long min_coredump;     /* minimal dump size */
+       int hasvdso;
 };
 
 extern int register_binfmt(struct linux_binfmt *);
 extern int unregister_binfmt(struct linux_binfmt *);
 
 extern int prepare_binprm(struct linux_binprm *);
-extern void remove_arg_zero(struct linux_binprm *);
+extern int __must_check remove_arg_zero(struct linux_binprm *);
 extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
 extern int flush_old_exec(struct linux_binprm * bprm);
 
@@ -82,6 +93,7 @@ extern int suid_dumpable;
 extern int setup_arg_pages(struct linux_binprm * bprm,
                           unsigned long stack_top,
                           int executable_stack);
+extern int bprm_mm_init(struct linux_binprm *bprm);
 extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
 extern void compute_creds(struct linux_binprm *binprm);
 extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);