include/linux/binfmts.h

   1 #ifndef _LINUX_BINFMTS_H
   2 #define _LINUX_BINFMTS_H
   3
   4 #include <linux/capability.h>
   5
   6 struct 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  */
  23 struct 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  */
  55 struct 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
  64 extern int register_binfmt(struct linux_binfmt *);
  65 extern int unregister_binfmt(struct linux_binfmt *);
  66
  67 extern int prepare_binprm(struct linux_binprm *);
  68 extern void remove_arg_zero(struct linux_binprm *);
  69 extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
  70 extern int flush_old_exec(struct linux_binprm * bprm);
  71
  72 extern 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
  82 extern int setup_arg_pages(struct linux_binprm * bprm,
  83                            unsigned long stack_top,
  84                            int executable_stack);
  85 extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
  86 extern void compute_creds(struct linux_binprm *binprm);
  87 extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
  88 extern int set_binfmt(struct linux_binfmt *new);
  89
  90 #endif /* __KERNEL__ */
  91 #endif /* _LINUX_BINFMTS_H */