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         int sh_bang;
  38         struct file * file;
  39         int e_uid, e_gid;
  40         kernel_cap_t cap_inheritable, cap_permitted, cap_effective;
  41         void *security;
  42         int argc, envc;
  43         char * filename;        /* Name of binary as seen by procps */
  44         char * interp;          /* Name of the binary really executed. Most
  45                                    of the time same as filename, but could be
  46                                    different for binfmt_{misc,script} */
  47         unsigned interp_flags;
  48         unsigned interp_data;
  49         unsigned long loader, exec;
  50         unsigned long argv_len;
  51 };
  52
  53 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
  54 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
  55
  56 /* fd of the binary should be passed to the interpreter */
  57 #define BINPRM_FLAGS_EXECFD_BIT 1
  58 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
  59
  60
  61 /*
  62  * This structure defines the functions that are used to load the binary formats that
  63  * linux accepts.
  64  */
  65 struct linux_binfmt {
  66         struct linux_binfmt * next;
  67         struct module *module;
  68         int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
  69         int (*load_shlib)(struct file *);
  70         int (*core_dump)(long signr, struct pt_regs * regs, struct file * file);
  71         unsigned long min_coredump;     /* minimal dump size */
  72         int hasvdso;
  73 };
  74
  75 extern int register_binfmt(struct linux_binfmt *);
  76 extern int unregister_binfmt(struct linux_binfmt *);
  77
  78 extern int prepare_binprm(struct linux_binprm *);
  79 extern int __must_check remove_arg_zero(struct linux_binprm *);
  80 extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
  81 extern int flush_old_exec(struct linux_binprm * bprm);
  82
  83 extern int suid_dumpable;
  84 #define SUID_DUMP_DISABLE       0       /* No setuid dumping */
  85 #define SUID_DUMP_USER          1       /* Dump as user of process */
  86 #define SUID_DUMP_ROOT          2       /* Dump as root */
  87
  88 /* Stack area protections */
  89 #define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
  90 #define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
  91 #define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
  92
  93 extern int setup_arg_pages(struct linux_binprm * bprm,
  94                            unsigned long stack_top,
  95                            int executable_stack);
  96 extern int bprm_mm_init(struct linux_binprm *bprm);
  97 extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
  98 extern void compute_creds(struct linux_binprm *binprm);
  99 extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
 100 extern int set_binfmt(struct linux_binfmt *new);
 101
 102 #endif /* __KERNEL__ */
 103 #endif /* _LINUX_BINFMTS_H */