LXR linux/include/linux/binfmts.h

   1#ifndef _LINUX_BINFMTS_H
   2#define _LINUX_BINFMTS_H
   3
   4#include <linux/capability.h>
   5
   6struct pt_regs;
   7
   8/*
   9 * MAX_ARG_PAGES defines the number of pages allocated for arguments
  10 * and envelope for the new program. 32 should suffice, this gives
  11 * a maximum env+arg of 128kB w/4KB pages!
  12 */
  13#define MAX_ARG_PAGES 32
  14
  15/* sizeof(linux_binprm->buf) */
  16#define BINPRM_BUF_SIZE 128
  17
  18#ifdef __KERNEL__
  19
  20/*
  21 * This structure is used to hold the arguments that are used when loading binaries.
  22 */
  23struct linux_binprm{
  24        char buf[BINPRM_BUF_SIZE];
  25        struct page *page[MAX_ARG_PAGES];
  26        struct mm_struct *mm;
  27        unsigned long p; /* current top of mem */
  28        int sh_bang;
  29        struct file * file;
  30        int e_uid, e_gid;
  31        kernel_cap_t cap_inheritable, cap_permitted, cap_effective;
  32        void *security;
  33        int argc, envc;
  34        char * filename;        /* Name of binary as seen by procps */
  35        char * interp;          /* Name of the binary really executed. Most
  36                                   of the time same as filename, but could be
  37                                   different for binfmt_{misc,script} */
  38        unsigned interp_flags;
  39        unsigned interp_data;
  40        unsigned long loader, exec;
  41};
  42
  43#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
  44#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
  45
  46/* fd of the binary should be passed to the interpreter */
  47#define BINPRM_FLAGS_EXECFD_BIT 1
  48#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
  49
  50
  51/*
  52 * This structure defines the functions that are used to load the binary formats that
  53 * linux accepts.
  54 */
  55struct linux_binfmt {
  56        struct linux_binfmt * next;
  57        struct module *module;
  58        int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
  59        int (*load_shlib)(struct file *);
  60        int (*core_dump)(long signr, struct pt_regs * regs, struct file * file);
  61        unsigned long min_coredump;     /* minimal dump size */
  62};
  63
  64extern int register_binfmt(struct linux_binfmt *);
  65extern int unregister_binfmt(struct linux_binfmt *);
  66
  67extern int prepare_binprm(struct linux_binprm *);
  68extern void remove_arg_zero(struct linux_binprm *);
  69extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
  70extern int flush_old_exec(struct linux_binprm * bprm);
  71
  72extern int suid_dumpable;
  73#define SUID_DUMP_DISABLE       0       /* No setuid dumping */
  74#define SUID_DUMP_USER          1       /* Dump as user of process */
  75#define SUID_DUMP_ROOT          2       /* Dump as root */
  76
  77/* Stack area protections */
  78#define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
  79#define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
  80#define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
  81
  82extern int setup_arg_pages(struct linux_binprm * bprm,
  83                           unsigned long stack_top,
  84                           int executable_stack);
  85extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
  86extern void compute_creds(struct linux_binprm *binprm);
  87extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
  88extern int set_binfmt(struct linux_binfmt *new);
  89
  90#endif /* __KERNEL__ */
  91#endif /* _LINUX_BINFMTS_H */
  92