LXR linux/include/linux/binfmts.h

   1#ifndef _LINUX_BINFMTS_H
   2#define _LINUX_BINFMTS_H
   3
   4#include <linux/capability.h>
   5
   6struct 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#include <linux/list.h>
  22
  23#define CORENAME_MAX_SIZE 128
  24
  25/*
  26 * This structure is used to hold the arguments that are used when loading binaries.
  27 */
  28struct linux_binprm{
  29        char buf[BINPRM_BUF_SIZE];
  30#ifdef CONFIG_MMU
  31        struct vm_area_struct *vma;
  32#else
  33# define MAX_ARG_PAGES  32
  34        struct page *page[MAX_ARG_PAGES];
  35#endif
  36        struct mm_struct *mm;
  37        unsigned long p; /* current top of mem */
  38        unsigned int
  39                cred_prepared:1,/* true if creds already prepared (multiple
  40                                 * preps happen for interpreters) */
  41                cap_effective:1;/* true if has elevated effective capabilities,
  42                                 * false if not; except for init which inherits
  43                                 * its parent's caps anyway */
  44#ifdef __alpha__
  45        unsigned int taso:1;
  46#endif
  47        unsigned int recursion_depth;
  48        struct file * file;
  49        struct cred *cred;      /* new credentials */
  50        int unsafe;             /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
  51        unsigned int per_clear; /* bits to clear in current->personality */
  52        int argc, envc;
  53        char * filename;        /* Name of binary as seen by procps */
  54        char * interp;          /* Name of the binary really executed. Most
  55                                   of the time same as filename, but could be
  56                                   different for binfmt_{misc,script} */
  57        unsigned interp_flags;
  58        unsigned interp_data;
  59        unsigned long loader, exec;
  60};
  61
  62#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
  63#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
  64
  65/* fd of the binary should be passed to the interpreter */
  66#define BINPRM_FLAGS_EXECFD_BIT 1
  67#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
  68
  69#define BINPRM_MAX_RECURSION 4
  70
  71/*
  72 * This structure defines the functions that are used to load the binary formats that
  73 * linux accepts.
  74 */
  75struct linux_binfmt {
  76        struct list_head lh;
  77        struct module *module;
  78        int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
  79        int (*load_shlib)(struct file *);
  80        int (*core_dump)(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
  81        unsigned long min_coredump;     /* minimal dump size */
  82        int hasvdso;
  83};
  84
  85extern int __register_binfmt(struct linux_binfmt *fmt, int insert);
  86
  87/* Registration of default binfmt handlers */
  88static inline int register_binfmt(struct linux_binfmt *fmt)
  89{
  90        return __register_binfmt(fmt, 0);
  91}
  92/* Same as above, but adds a new binfmt at the top of the list */
  93static inline int insert_binfmt(struct linux_binfmt *fmt)
  94{
  95        return __register_binfmt(fmt, 1);
  96}
  97
  98extern void unregister_binfmt(struct linux_binfmt *);
  99
 100extern int prepare_binprm(struct linux_binprm *);
 101extern int __must_check remove_arg_zero(struct linux_binprm *);
 102extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
 103extern int flush_old_exec(struct linux_binprm * bprm);
 104
 105extern int suid_dumpable;
 106#define SUID_DUMP_DISABLE       0       /* No setuid dumping */
 107#define SUID_DUMP_USER          1       /* Dump as user of process */
 108#define SUID_DUMP_ROOT          2       /* Dump as root */
 109
 110/* Stack area protections */
 111#define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
 112#define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
 113#define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
 114
 115extern int setup_arg_pages(struct linux_binprm * bprm,
 116                           unsigned long stack_top,
 117                           int executable_stack);
 118extern int bprm_mm_init(struct linux_binprm *bprm);
 119extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
 120extern void install_exec_creds(struct linux_binprm *bprm);
 121extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
 122extern int set_binfmt(struct linux_binfmt *new);
 123extern void free_bprm(struct linux_binprm *);
 124
 125#endif /* __KERNEL__ */
 126#endif /* _LINUX_BINFMTS_H */
 127