include/linux/binfmts.h

   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 struct filename;
  10
  11 #define CORENAME_MAX_SIZE 128
  12
  13 /*
  14  * This structure is used to hold the arguments that are used when loading binaries.
  15  */
  16 struct linux_binprm {
  17         char buf[BINPRM_BUF_SIZE];
  18 #ifdef CONFIG_MMU
  19         struct vm_area_struct *vma;
  20         unsigned long vma_pages;
  21 #else
  22 # define MAX_ARG_PAGES  32
  23         struct page *page[MAX_ARG_PAGES];
  24 #endif
  25         struct mm_struct *mm;
  26         unsigned long p; /* current top of mem */
  27         unsigned int
  28                 cred_prepared:1,/* true if creds already prepared (multiple
  29                                  * preps happen for interpreters) */
  30                 cap_effective:1;/* true if has elevated effective capabilities,
  31                                  * false if not; except for init which inherits
  32                                  * its parent's caps anyway */
  33 #ifdef __alpha__
  34         unsigned int taso:1;
  35 #endif
  36         unsigned int recursion_depth; /* only for search_binary_handler() */
  37         struct file * file;
  38         struct cred *cred;      /* new credentials */
  39         int unsafe;             /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
  40         unsigned int per_clear; /* bits to clear in current->personality */
  41         int argc, envc;
  42         const char * filename;  /* Name of binary as seen by procps */
  43         const char * interp;    /* Name of the binary really executed. Most
  44                                    of the time same as filename, but could be
  45                                    different for binfmt_{misc,script} */
  46         unsigned interp_flags;
  47         unsigned interp_data;
  48         unsigned long loader, exec;
  49 } __randomize_layout;
  50
  51 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
  52 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
  53
  54 /* fd of the binary should be passed to the interpreter */
  55 #define BINPRM_FLAGS_EXECFD_BIT 1
  56 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
  57
  58 /* filename of the binary will be inaccessible after exec */
  59 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2
  60 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT)
  61
  62 /* Function parameter for binfmt->coredump */
  63 struct coredump_params {
  64         const siginfo_t *siginfo;
  65         struct pt_regs *regs;
  66         struct file *file;
  67         unsigned long limit;
  68         unsigned long mm_flags;
  69         loff_t written;
  70         loff_t pos;
  71 };
  72
  73 /*
  74  * This structure defines the functions that are used to load the binary formats that
  75  * linux accepts.
  76  */
  77 struct linux_binfmt {
  78         struct list_head lh;
  79         struct module *module;
  80         int (*load_binary)(struct linux_binprm *);
  81         int (*load_shlib)(struct file *);
  82         int (*core_dump)(struct coredump_params *cprm);
  83         unsigned long min_coredump;     /* minimal dump size */
  84 } __randomize_layout;
  85
  86 extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
  87
  88 /* Registration of default binfmt handlers */
  89 static inline void register_binfmt(struct linux_binfmt *fmt)
  90 {
  91         __register_binfmt(fmt, 0);
  92 }
  93 /* Same as above, but adds a new binfmt at the top of the list */
  94 static inline void insert_binfmt(struct linux_binfmt *fmt)
  95 {
  96         __register_binfmt(fmt, 1);
  97 }
  98
  99 extern void unregister_binfmt(struct linux_binfmt *);
 100
 101 extern int prepare_binprm(struct linux_binprm *);
 102 extern int __must_check remove_arg_zero(struct linux_binprm *);
 103 extern int search_binary_handler(struct linux_binprm *);
 104 extern int flush_old_exec(struct linux_binprm * bprm);
 105 extern void setup_new_exec(struct linux_binprm * bprm);
 106 extern void would_dump(struct linux_binprm *, struct file *);
 107
 108 extern int suid_dumpable;
 109
 110 /* Stack area protections */
 111 #define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
 112 #define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
 113 #define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
 114
 115 extern int setup_arg_pages(struct linux_binprm * bprm,
 116                            unsigned long stack_top,
 117                            int executable_stack);
 118 extern int transfer_args_to_stack(struct linux_binprm *bprm,
 119                                   unsigned long *sp_location);
 120 extern int bprm_change_interp(char *interp, struct linux_binprm *bprm);
 121 extern int copy_strings_kernel(int argc, const char *const *argv,
 122                                struct linux_binprm *bprm);
 123 extern int prepare_bprm_creds(struct linux_binprm *bprm);
 124 extern void install_exec_creds(struct linux_binprm *bprm);
 125 extern void set_binfmt(struct linux_binfmt *new);
 126 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
 127
 128 extern int do_execve(struct filename *,
 129                      const char __user * const __user *,
 130                      const char __user * const __user *);
 131 extern int do_execveat(int, struct filename *,
 132                        const char __user * const __user *,
 133                        const char __user * const __user *,
 134                        int);
 135
 136 #endif /* _LINUX_BINFMTS_H */