linux/include/linux/binfmts.h
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   1#ifndef _LINUX_BINFMTS_H
   2#define _LINUX_BINFMTS_H
   3
   4#include <linux/sched.h>
   5#include <linux/unistd.h>
   6#include <asm/exec.h>
   7#include <uapi/linux/binfmts.h>
   8
   9#define CORENAME_MAX_SIZE 128
  10
  11/*
  12 * This structure is used to hold the arguments that are used when loading binaries.
  13 */
  14struct linux_binprm {
  15        char buf[BINPRM_BUF_SIZE];
  16#ifdef CONFIG_MMU
  17        struct vm_area_struct *vma;
  18        unsigned long vma_pages;
  19#else
  20# define MAX_ARG_PAGES  32
  21        struct page *page[MAX_ARG_PAGES];
  22#endif
  23        struct mm_struct *mm;
  24        unsigned long p; /* current top of mem */
  25        unsigned int
  26                cred_prepared:1,/* true if creds already prepared (multiple
  27                                 * preps happen for interpreters) */
  28                cap_effective:1;/* true if has elevated effective capabilities,
  29                                 * false if not; except for init which inherits
  30                                 * its parent's caps anyway */
  31#ifdef __alpha__
  32        unsigned int taso:1;
  33#endif
  34        unsigned int recursion_depth; /* only for search_binary_handler() */
  35        struct file * file;
  36        struct cred *cred;      /* new credentials */
  37        int unsafe;             /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
  38        unsigned int per_clear; /* bits to clear in current->personality */
  39        int argc, envc;
  40        const char * filename;  /* Name of binary as seen by procps */
  41        const char * interp;    /* Name of the binary really executed. Most
  42                                   of the time same as filename, but could be
  43                                   different for binfmt_{misc,script} */
  44        unsigned interp_flags;
  45        unsigned interp_data;
  46        unsigned long loader, exec;
  47};
  48
  49#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
  50#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
  51
  52/* fd of the binary should be passed to the interpreter */
  53#define BINPRM_FLAGS_EXECFD_BIT 1
  54#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
  55
  56/* filename of the binary will be inaccessible after exec */
  57#define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2
  58#define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT)
  59
  60/* Function parameter for binfmt->coredump */
  61struct coredump_params {
  62        const siginfo_t *siginfo;
  63        struct pt_regs *regs;
  64        struct file *file;
  65        unsigned long limit;
  66        unsigned long mm_flags;
  67        loff_t written;
  68};
  69
  70/*
  71 * This structure defines the functions that are used to load the binary formats that
  72 * linux accepts.
  73 */
  74struct linux_binfmt {
  75        struct list_head lh;
  76        struct module *module;
  77        int (*load_binary)(struct linux_binprm *);
  78        int (*load_shlib)(struct file *);
  79        int (*core_dump)(struct coredump_params *cprm);
  80        unsigned long min_coredump;     /* minimal dump size */
  81};
  82
  83extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
  84
  85/* Registration of default binfmt handlers */
  86static inline void register_binfmt(struct linux_binfmt *fmt)
  87{
  88        __register_binfmt(fmt, 0);
  89}
  90/* Same as above, but adds a new binfmt at the top of the list */
  91static inline void insert_binfmt(struct linux_binfmt *fmt)
  92{
  93        __register_binfmt(fmt, 1);
  94}
  95
  96extern void unregister_binfmt(struct linux_binfmt *);
  97
  98extern int prepare_binprm(struct linux_binprm *);
  99extern int __must_check remove_arg_zero(struct linux_binprm *);
 100extern int search_binary_handler(struct linux_binprm *);
 101extern int flush_old_exec(struct linux_binprm * bprm);
 102extern void setup_new_exec(struct linux_binprm * bprm);
 103extern void would_dump(struct linux_binprm *, struct file *);
 104
 105extern int suid_dumpable;
 106
 107/* Stack area protections */
 108#define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
 109#define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
 110#define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
 111
 112extern int setup_arg_pages(struct linux_binprm * bprm,
 113                           unsigned long stack_top,
 114                           int executable_stack);
 115extern int bprm_change_interp(char *interp, struct linux_binprm *bprm);
 116extern int copy_strings_kernel(int argc, const char *const *argv,
 117                               struct linux_binprm *bprm);
 118extern int prepare_bprm_creds(struct linux_binprm *bprm);
 119extern void install_exec_creds(struct linux_binprm *bprm);
 120extern void set_binfmt(struct linux_binfmt *new);
 121extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
 122
 123#endif /* _LINUX_BINFMTS_H */
 124
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