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