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        char tcomm[TASK_COMM_LEN];
  48};
  49
  50#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
  51#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
  52
  53/* fd of the binary should be passed to the interpreter */
  54#define BINPRM_FLAGS_EXECFD_BIT 1
  55#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
  56
  57/* Function parameter for binfmt->coredump */
  58struct coredump_params {
  59        const siginfo_t *siginfo;
  60        struct pt_regs *regs;
  61        struct file *file;
  62        unsigned long limit;
  63        unsigned long mm_flags;
  64        loff_t written;
  65};
  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 *);
  75        int (*load_shlib)(struct file *);
  76        int (*core_dump)(struct coredump_params *cprm);
  77        unsigned long min_coredump;     /* minimal dump size */
  78};
  79
  80extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
  81
  82/* Registration of default binfmt handlers */
  83static inline void register_binfmt(struct linux_binfmt *fmt)
  84{
  85        __register_binfmt(fmt, 0);
  86}
  87/* Same as above, but adds a new binfmt at the top of the list */
  88static inline void insert_binfmt(struct linux_binfmt *fmt)
  89{
  90        __register_binfmt(fmt, 1);
  91}
  92
  93extern void unregister_binfmt(struct linux_binfmt *);
  94
  95extern int prepare_binprm(struct linux_binprm *);
  96extern int __must_check remove_arg_zero(struct linux_binprm *);
  97extern int search_binary_handler(struct linux_binprm *);
  98extern int flush_old_exec(struct linux_binprm * bprm);
  99extern void setup_new_exec(struct linux_binprm * bprm);
 100extern void would_dump(struct linux_binprm *, struct file *);
 101
 102extern int suid_dumpable;
 103
 104/* Stack area protections */
 105#define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
 106#define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
 107#define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
 108
 109extern int setup_arg_pages(struct linux_binprm * bprm,
 110                           unsigned long stack_top,
 111                           int executable_stack);
 112extern int bprm_change_interp(char *interp, struct linux_binprm *bprm);
 113extern int copy_strings_kernel(int argc, const char *const *argv,
 114                               struct linux_binprm *bprm);
 115extern int prepare_bprm_creds(struct linux_binprm *bprm);
 116extern void install_exec_creds(struct linux_binprm *bprm);
 117extern void set_binfmt(struct linux_binfmt *new);
 118extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
 119
 120#endif /* _LINUX_BINFMTS_H */
 121
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