1#ifndef _LINUX_BINFMTS_H
2#define _LINUX_BINFMTS_H
3
4#include <linux/capability.h>
5
6struct pt_regs;
7
8/*
9 * MAX_ARG_PAGES defines the number of pages allocated for arguments
10 * and envelope for the new program. 32 should suffice, this gives
11 * a maximum env+arg of 128kB w/4KB pages!
12 */
13#define MAX_ARG_PAGES 32
14
15/* sizeof(linux_binprm->buf) */
16#define BINPRM_BUF_SIZE 128
17
18#ifdef __KERNEL__
19
20/*
21 * This structure is used to hold the arguments that are used when loading binaries.
22 */
23struct linux_binprm{
24	char buf[BINPRM_BUF_SIZE];
25	struct page *page[MAX_ARG_PAGES];
26	struct mm_struct *mm;
27	unsigned long p; /* current top of mem */
28	int sh_bang;
29	struct file * file;
30	int e_uid, e_gid;
31	kernel_cap_t cap_inheritable, cap_permitted, cap_effective;
32	void *security;
33	int argc, envc;
34	char * filename;	/* Name of binary as seen by procps */
35	char * interp;		/* Name of the binary really executed. Most
36				   of the time same as filename, but could be
37				   different for binfmt_{misc,script} */
38	unsigned interp_flags;
39	unsigned interp_data;
40	unsigned long loader, exec;
41};
42
43#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
44#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
45
46/* fd of the binary should be passed to the interpreter */
47#define BINPRM_FLAGS_EXECFD_BIT 1
48#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
49
50
51/*
52 * This structure defines the functions that are used to load the binary formats that
53 * linux accepts.
54 */
55struct linux_binfmt {
56	struct linux_binfmt * next;
57	struct module *module;
58	int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
59	int (*load_shlib)(struct file *);
60	int (*core_dump)(long signr, struct pt_regs * regs, struct file * file);
61	unsigned long min_coredump;	/* minimal dump size */
62};
63
64extern int register_binfmt(struct linux_binfmt *);
65extern int unregister_binfmt(struct linux_binfmt *);
66
67extern int prepare_binprm(struct linux_binprm *);
68extern void remove_arg_zero(struct linux_binprm *);
69extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
70extern int flush_old_exec(struct linux_binprm * bprm);
71
72extern int suid_dumpable;
73#define SUID_DUMP_DISABLE	0	/* No setuid dumping */
74#define SUID_DUMP_USER		1	/* Dump as user of process */
75#define SUID_DUMP_ROOT		2	/* Dump as root */
76
77/* Stack area protections */
78#define EXSTACK_DEFAULT   0	/* Whatever the arch defaults to */
79#define EXSTACK_DISABLE_X 1	/* Disable executable stacks */
80#define EXSTACK_ENABLE_X  2	/* Enable executable stacks */
81
82extern int setup_arg_pages(struct linux_binprm * bprm,
83			   unsigned long stack_top,
84			   int executable_stack);
85extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
86extern void compute_creds(struct linux_binprm *binprm);
87extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
88extern int set_binfmt(struct linux_binfmt *new);
89
90#endif /* __KERNEL__ */
91#endif /* _LINUX_BINFMTS_H */
92