include/linux/binfmts.h

   1 #ifndef _LINUX_BINFMTS_H
   2 #define _LINUX_BINFMTS_H
   3
   4 #include <linux/capability.h>
   5
   6 struct pt_regs;
   7
   8 /*
   9  * These are the maximum length and maximum number of strings passed to the
  10  * execve() system call.  MAX_ARG_STRLEN is essentially random but serves to
  11  * prevent the kernel from being unduly impacted by misaddressed pointers.
  12  * MAX_ARG_STRINGS is chosen to fit in a signed 32-bit integer.
  13  */
  14 #define MAX_ARG_STRLEN (PAGE_SIZE * 32)
  15 #define MAX_ARG_STRINGS 0x7FFFFFFF
  16
  17 /* sizeof(linux_binprm->buf) */
  18 #define BINPRM_BUF_SIZE 128
  19
  20 #ifdef __KERNEL__
  21
  22 #define CORENAME_MAX_SIZE 128
  23
  24 /*
  25  * This structure is used to hold the arguments that are used when loading binaries.
  26  */
  27 struct linux_binprm{
  28         char buf[BINPRM_BUF_SIZE];
  29 #ifdef CONFIG_MMU
  30         struct vm_area_struct *vma;
  31 #else
  32 # define MAX_ARG_PAGES  32
  33         struct page *page[MAX_ARG_PAGES];
  34 #endif
  35         struct mm_struct *mm;
  36         unsigned long p; /* current top of mem */
  37         unsigned int sh_bang:1,
  38                      misc_bang:1;
  39 #ifdef __alpha__
  40         unsigned int taso:1;
  41 #endif
  42         unsigned int recursion_depth;
  43         struct file * file;
  44         int e_uid, e_gid;
  45         kernel_cap_t cap_post_exec_permitted;
  46         bool cap_effective;
  47         void *security;
  48         int argc, envc;
  49         char * filename;        /* Name of binary as seen by procps */
  50         char * interp;          /* Name of the binary really executed. Most
  51                                    of the time same as filename, but could be
  52                                    different for binfmt_{misc,script} */
  53         unsigned interp_flags;
  54         unsigned interp_data;
  55         unsigned long loader, exec;
  56 };
  57
  58 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
  59 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
  60
  61 /* fd of the binary should be passed to the interpreter */
  62 #define BINPRM_FLAGS_EXECFD_BIT 1
  63 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
  64
  65 #define BINPRM_MAX_RECURSION 4
  66
  67 /*
  68  * This structure defines the functions that are used to load the binary formats that
  69  * linux accepts.
  70  */
  71 struct linux_binfmt {
  72         struct list_head lh;
  73         struct module *module;
  74         int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
  75         int (*load_shlib)(struct file *);
  76         int (*core_dump)(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
  77         unsigned long min_coredump;     /* minimal dump size */
  78         int hasvdso;
  79 };
  80
  81 extern int register_binfmt(struct linux_binfmt *);
  82 extern void unregister_binfmt(struct linux_binfmt *);
  83
  84 extern int prepare_binprm(struct linux_binprm *);
  85 extern int __must_check remove_arg_zero(struct linux_binprm *);
  86 extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
  87 extern int flush_old_exec(struct linux_binprm * bprm);
  88
  89 extern int suid_dumpable;
  90 #define SUID_DUMP_DISABLE       0       /* No setuid dumping */
  91 #define SUID_DUMP_USER          1       /* Dump as user of process */
  92 #define SUID_DUMP_ROOT          2       /* Dump as root */
  93
  94 /* Stack area protections */
  95 #define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
  96 #define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
  97 #define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
  98
  99 extern int setup_arg_pages(struct linux_binprm * bprm,
 100                            unsigned long stack_top,
 101                            int executable_stack);
 102 extern int bprm_mm_init(struct linux_binprm *bprm);
 103 extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
 104 extern void compute_creds(struct linux_binprm *binprm);
 105 extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
 106 extern int set_binfmt(struct linux_binfmt *new);
 107 extern void free_bprm(struct linux_binprm *);
 108
 109 #endif /* __KERNEL__ */
 110 #endif /* _LINUX_BINFMTS_H */