Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 sh_bang:1,
39 misc_bang:1,
40 cred_prepared:1,/* true if creds already prepared (multiple
41 * preps happen for interpreters) */
42 cap_effective:1;/* true if has elevated effective capabilities,
43 * false if not; except for init which inherits
44 * its parent's caps anyway */
45#ifdef __alpha__
46 unsigned int taso:1;
47#endif
48 unsigned int recursion_depth;
49 struct file * file;
50 struct cred *cred; /* new credentials */
51 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
52 unsigned int per_clear; /* bits to clear in current->personality */
53 int argc, envc;
54 char * filename; /* Name of binary as seen by procps */
55 char * interp; /* Name of the binary really executed. Most
56 of the time same as filename, but could be
57 different for binfmt_{misc,script} */
58 unsigned interp_flags;
59 unsigned interp_data;
60 unsigned long loader, exec;
61};
62
63#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
64#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
65
66/* fd of the binary should be passed to the interpreter */
67#define BINPRM_FLAGS_EXECFD_BIT 1
68#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
69
70#define BINPRM_MAX_RECURSION 4
71
72/*
73 * This structure defines the functions that are used to load the binary formats that
74 * linux accepts.
75 */
76struct linux_binfmt {
77 struct list_head lh;
78 struct module *module;
79 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs);
80 int (*load_shlib)(struct file *);
81 int (*core_dump)(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
82 unsigned long min_coredump; /* minimal dump size */
83 int hasvdso;
84};
85
86extern int register_binfmt(struct linux_binfmt *);
87extern void unregister_binfmt(struct linux_binfmt *);
88
89extern int prepare_binprm(struct linux_binprm *);
90extern int __must_check remove_arg_zero(struct linux_binprm *);
91extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
92extern int flush_old_exec(struct linux_binprm * bprm);
93
94extern int suid_dumpable;
95#define SUID_DUMP_DISABLE 0 /* No setuid dumping */
96#define SUID_DUMP_USER 1 /* Dump as user of process */
97#define SUID_DUMP_ROOT 2 /* Dump as root */
98
99/* Stack area protections */
100#define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */
101#define EXSTACK_DISABLE_X 1 /* Disable executable stacks */
102#define EXSTACK_ENABLE_X 2 /* Enable executable stacks */
103
104extern int setup_arg_pages(struct linux_binprm * bprm,
105 unsigned long stack_top,
106 int executable_stack);
107extern int bprm_mm_init(struct linux_binprm *bprm);
108extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
109extern void install_exec_creds(struct linux_binprm *bprm);
110extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
111extern int set_binfmt(struct linux_binfmt *new);
112extern void free_bprm(struct linux_binprm *);
113
114#endif /* __KERNEL__ */
115#endif /* _LINUX_BINFMTS_H */