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                 /*
  29                  * True after the bprm_set_creds hook has been called once
  30                  * (multiple calls can be made via prepare_binprm() for
  31                  * binfmt_script/misc).
  32                  */
  33                 called_set_creds:1,
  34                 /*
  35                  * True if most recent call to the commoncaps bprm_set_creds
  36                  * hook (due to multiple prepare_binprm() calls from the
  37                  * binfmt_script/misc handlers) resulted in elevated
  38                  * privileges.
  39                  */
  40                 cap_elevated:1,
  41                 /*
  42                  * Set by bprm_set_creds hook to indicate a privilege-gaining
  43                  * exec has happened. Used to sanitize execution environment
  44                  * and to set AT_SECURE auxv for glibc.
  45                  */
  46                 secureexec:1;
  47 #ifdef __alpha__
  48         unsigned int taso:1;
  49 #endif
  50         unsigned int recursion_depth; /* only for search_binary_handler() */
  51         struct file * file;
  52         struct cred *cred;      /* new credentials */
  53         int unsafe;             /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
  54         unsigned int per_clear; /* bits to clear in current->personality */
  55         int argc, envc;
  56         const char * filename;  /* Name of binary as seen by procps */
  57         const char * interp;    /* Name of the binary really executed. Most
  58                                    of the time same as filename, but could be
  59                                    different for binfmt_{misc,script} */
  60         unsigned interp_flags;
  61         unsigned interp_data;
  62         unsigned long loader, exec;
  63 } __randomize_layout;
  64
  65 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
  66 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
  67
  68 /* fd of the binary should be passed to the interpreter */
  69 #define BINPRM_FLAGS_EXECFD_BIT 1
  70 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
  71
  72 /* filename of the binary will be inaccessible after exec */
  73 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2
  74 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT)
  75
  76 /* Function parameter for binfmt->coredump */
  77 struct coredump_params {
  78         const siginfo_t *siginfo;
  79         struct pt_regs *regs;
  80         struct file *file;
  81         unsigned long limit;
  82         unsigned long mm_flags;
  83         loff_t written;
  84         loff_t pos;
  85 };
  86
  87 /*
  88  * This structure defines the functions that are used to load the binary formats that
  89  * linux accepts.
  90  */
  91 struct linux_binfmt {
  92         struct list_head lh;
  93         struct module *module;
  94         int (*load_binary)(struct linux_binprm *);
  95         int (*load_shlib)(struct file *);
  96         int (*core_dump)(struct coredump_params *cprm);
  97         unsigned long min_coredump;     /* minimal dump size */
  98 } __randomize_layout;
  99
 100 extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
 101
 102 /* Registration of default binfmt handlers */
 103 static inline void register_binfmt(struct linux_binfmt *fmt)
 104 {
 105         __register_binfmt(fmt, 0);
 106 }
 107 /* Same as above, but adds a new binfmt at the top of the list */
 108 static inline void insert_binfmt(struct linux_binfmt *fmt)
 109 {
 110         __register_binfmt(fmt, 1);
 111 }
 112
 113 extern void unregister_binfmt(struct linux_binfmt *);
 114
 115 extern int prepare_binprm(struct linux_binprm *);
 116 extern int __must_check remove_arg_zero(struct linux_binprm *);
 117 extern int search_binary_handler(struct linux_binprm *);
 118 extern int flush_old_exec(struct linux_binprm * bprm);
 119 extern void setup_new_exec(struct linux_binprm * bprm);
 120 extern void would_dump(struct linux_binprm *, struct file *);
 121
 122 extern int suid_dumpable;
 123
 124 /* Stack area protections */
 125 #define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
 126 #define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
 127 #define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
 128
 129 extern int setup_arg_pages(struct linux_binprm * bprm,
 130                            unsigned long stack_top,
 131                            int executable_stack);
 132 extern int transfer_args_to_stack(struct linux_binprm *bprm,
 133                                   unsigned long *sp_location);
 134 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm);
 135 extern int copy_strings_kernel(int argc, const char *const *argv,
 136                                struct linux_binprm *bprm);
 137 extern int prepare_bprm_creds(struct linux_binprm *bprm);
 138 extern void install_exec_creds(struct linux_binprm *bprm);
 139 extern void set_binfmt(struct linux_binfmt *new);
 140 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
 141
 142 extern int do_execve(struct filename *,
 143                      const char __user * const __user *,
 144                      const char __user * const __user *);
 145 extern int do_execveat(int, struct filename *,
 146                        const char __user * const __user *,
 147                        const char __user * const __user *,
 148                        int);
 149
 150 #endif /* _LINUX_BINFMTS_H */