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 #define CORENAME_MAX_SIZE 128
  10
  11 /*
  12  * This structure is used to hold the arguments that are used when loading binaries.
  13  */
  14 struct 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;
  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 #define BINPRM_MAX_RECURSION 4
  58
  59 /* Function parameter for binfmt->coredump */
  60 struct coredump_params {
  61         siginfo_t *siginfo;
  62         struct pt_regs *regs;
  63         struct file *file;
  64         unsigned long limit;
  65         unsigned long mm_flags;
  66 };
  67
  68 /*
  69  * This structure defines the functions that are used to load the binary formats that
  70  * linux accepts.
  71  */
  72 struct linux_binfmt {
  73         struct list_head lh;
  74         struct module *module;
  75         int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
  76         int (*load_shlib)(struct file *);
  77         int (*core_dump)(struct coredump_params *cprm);
  78         unsigned long min_coredump;     /* minimal dump size */
  79 };
  80
  81 extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
  82
  83 /* Registration of default binfmt handlers */
  84 static inline void register_binfmt(struct linux_binfmt *fmt)
  85 {
  86         __register_binfmt(fmt, 0);
  87 }
  88 /* Same as above, but adds a new binfmt at the top of the list */
  89 static inline void insert_binfmt(struct linux_binfmt *fmt)
  90 {
  91         __register_binfmt(fmt, 1);
  92 }
  93
  94 extern void unregister_binfmt(struct linux_binfmt *);
  95
  96 extern int prepare_binprm(struct linux_binprm *);
  97 extern int __must_check remove_arg_zero(struct linux_binprm *);
  98 extern int search_binary_handler(struct linux_binprm *, struct pt_regs *);
  99 extern int flush_old_exec(struct linux_binprm * bprm);
 100 extern void setup_new_exec(struct linux_binprm * bprm);
 101 extern void would_dump(struct linux_binprm *, struct file *);
 102
 103 extern int suid_dumpable;
 104 #define SUID_DUMP_DISABLE       0       /* No setuid dumping */
 105 #define SUID_DUMP_USER          1       /* Dump as user of process */
 106 #define SUID_DUMP_ROOT          2       /* Dump as root */
 107
 108 /* Stack area protections */
 109 #define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
 110 #define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
 111 #define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
 112
 113 extern int setup_arg_pages(struct linux_binprm * bprm,
 114                            unsigned long stack_top,
 115                            int executable_stack);
 116 extern int bprm_mm_init(struct linux_binprm *bprm);
 117 extern int copy_strings_kernel(int argc, const char *const *argv,
 118                                struct linux_binprm *bprm);
 119 extern int prepare_bprm_creds(struct linux_binprm *bprm);
 120 extern void install_exec_creds(struct linux_binprm *bprm);
 121 extern void set_binfmt(struct linux_binfmt *new);
 122 extern void free_bprm(struct linux_binprm *);
 123
 124 #ifdef __ARCH_WANT_KERNEL_EXECVE
 125 extern void ret_from_kernel_execve(struct pt_regs *normal) __noreturn;
 126 #endif
 127
 128 #endif /* _LINUX_BINFMTS_H */