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        unsigned int sh_bang:1,
  38                     misc_bang:1;
  39#ifdef __alpha__
  40        unsigned int taso:1;
  41#endif
  42        unsigned int recursion_depth;
  43        struct file * file;
  44        int e_uid, e_gid;
  45        kernel_cap_t cap_post_exec_permitted;
  46        bool cap_effective;
  47        void *security;
  48        int argc, envc;
  49        char * filename;        /* Name of binary as seen by procps */
  50        char * interp;          /* Name of the binary really executed. Most
  51                                   of the time same as filename, but could be
  52                                   different for binfmt_{misc,script} */
  53        unsigned interp_flags;
  54        unsigned interp_data;
  55        unsigned long loader, exec;
  56};
  57
  58#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
  59#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
  60
  61/* fd of the binary should be passed to the interpreter */
  62#define BINPRM_FLAGS_EXECFD_BIT 1
  63#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
  64
  65#define BINPRM_MAX_RECURSION 4
  66
  67/*
  68 * This structure defines the functions that are used to load the binary formats that
  69 * linux accepts.
  70 */
  71struct linux_binfmt {
  72        struct list_head lh;
  73        struct module *module;
  74        int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
  75        int (*load_shlib)(struct file *);
  76        int (*core_dump)(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
  77        unsigned long min_coredump;     /* minimal dump size */
  78        int hasvdso;
  79};
  80
  81extern int register_binfmt(struct linux_binfmt *);
  82extern void unregister_binfmt(struct linux_binfmt *);
  83
  84extern int prepare_binprm(struct linux_binprm *);
  85extern int __must_check remove_arg_zero(struct linux_binprm *);
  86extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
  87extern int flush_old_exec(struct linux_binprm * bprm);
  88
  89extern int suid_dumpable;
  90#define SUID_DUMP_DISABLE       0       /* No setuid dumping */
  91#define SUID_DUMP_USER          1       /* Dump as user of process */
  92#define SUID_DUMP_ROOT          2       /* Dump as root */
  93
  94/* Stack area protections */
  95#define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
  96#define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
  97#define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
  98
  99extern int setup_arg_pages(struct linux_binprm * bprm,
 100                           unsigned long stack_top,
 101                           int executable_stack);
 102extern int bprm_mm_init(struct linux_binprm *bprm);
 103extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
 104extern void compute_creds(struct linux_binprm *binprm);
 105extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
 106extern int set_binfmt(struct linux_binfmt *new);
 107extern void free_bprm(struct linux_binprm *);
 108
 109#endif /* __KERNEL__ */
 110#endif /* _LINUX_BINFMTS_H */
 111