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 * These are the maximum length and maximum number of strings passed to the
  10 * execve() system call.  MAX_ARG_STRLEN is essentially random but serves to
  11 * prevent the kernel from being unduly impacted by misaddressed pointers.
  12 * MAX_ARG_STRINGS is chosen to fit in a signed 32-bit integer.
  13 */
  14#define MAX_ARG_STRLEN (PAGE_SIZE * 32)
  15#define MAX_ARG_STRINGS 0x7FFFFFFF
  16
  17/* sizeof(linux_binprm->buf) */
  18#define BINPRM_BUF_SIZE 128
  19
  20#ifdef __KERNEL__
  21
  22#define CORENAME_MAX_SIZE 128
  23
  24/*
  25 * This structure is used to hold the arguments that are used when loading binaries.
  26 */
  27struct linux_binprm{
  28        char buf[BINPRM_BUF_SIZE];
  29#ifdef CONFIG_MMU
  30        struct vm_area_struct *vma;
  31#else
  32# define MAX_ARG_PAGES  32
  33        struct page *page[MAX_ARG_PAGES];
  34#endif
  35        struct mm_struct *mm;
  36        unsigned long p; /* current top of mem */
  37        int sh_bang;
  38        struct file * file;
  39        int e_uid, e_gid;
  40        kernel_cap_t cap_inheritable, cap_permitted;
  41        bool cap_effective;
  42        void *security;
  43        int argc, envc;
  44        char * filename;        /* Name of binary as seen by procps */
  45        char * interp;          /* Name of the binary really executed. Most
  46                                   of the time same as filename, but could be
  47                                   different for binfmt_{misc,script} */
  48        unsigned interp_flags;
  49        unsigned interp_data;
  50        unsigned long loader, exec;
  51        unsigned long argv_len;
  52};
  53
  54#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
  55#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
  56
  57/* fd of the binary should be passed to the interpreter */
  58#define BINPRM_FLAGS_EXECFD_BIT 1
  59#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
  60
  61
  62/*
  63 * This structure defines the functions that are used to load the binary formats that
  64 * linux accepts.
  65 */
  66struct linux_binfmt {
  67        struct list_head lh;
  68        struct module *module;
  69        int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
  70        int (*load_shlib)(struct file *);
  71        int (*core_dump)(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
  72        unsigned long min_coredump;     /* minimal dump size */
  73        int hasvdso;
  74};
  75
  76extern int register_binfmt(struct linux_binfmt *);
  77extern void unregister_binfmt(struct linux_binfmt *);
  78
  79extern int prepare_binprm(struct linux_binprm *);
  80extern int __must_check remove_arg_zero(struct linux_binprm *);
  81extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
  82extern int flush_old_exec(struct linux_binprm * bprm);
  83
  84extern int suid_dumpable;
  85#define SUID_DUMP_DISABLE       0       /* No setuid dumping */
  86#define SUID_DUMP_USER          1       /* Dump as user of process */
  87#define SUID_DUMP_ROOT          2       /* Dump as root */
  88
  89/* Stack area protections */
  90#define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
  91#define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
  92#define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
  93
  94extern int setup_arg_pages(struct linux_binprm * bprm,
  95                           unsigned long stack_top,
  96                           int executable_stack);
  97extern int bprm_mm_init(struct linux_binprm *bprm);
  98extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
  99extern void compute_creds(struct linux_binprm *binprm);
 100extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
 101extern int set_binfmt(struct linux_binfmt *new);
 102
 103#endif /* __KERNEL__ */
 104#endif /* _LINUX_BINFMTS_H */
 105