Linux kernel mirror (for testing)
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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
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/* Function parameter for binfmt->coredump */
72struct coredump_params {
73 long signr;
74 struct pt_regs *regs;
75 struct file *file;
76 unsigned long limit;
77 unsigned long mm_flags;
78};
79
80/*
81 * This structure defines the functions that are used to load the binary formats that
82 * linux accepts.
83 */
84struct linux_binfmt {
85 struct list_head lh;
86 struct module *module;
87 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs);
88 int (*load_shlib)(struct file *);
89 int (*core_dump)(struct coredump_params *cprm);
90 unsigned long min_coredump; /* minimal dump size */
91 int hasvdso;
92};
93
94extern int __register_binfmt(struct linux_binfmt *fmt, int insert);
95
96/* Registration of default binfmt handlers */
97static inline int register_binfmt(struct linux_binfmt *fmt)
98{
99 return __register_binfmt(fmt, 0);
100}
101/* Same as above, but adds a new binfmt at the top of the list */
102static inline int insert_binfmt(struct linux_binfmt *fmt)
103{
104 return __register_binfmt(fmt, 1);
105}
106
107extern void unregister_binfmt(struct linux_binfmt *);
108
109extern int prepare_binprm(struct linux_binprm *);
110extern int __must_check remove_arg_zero(struct linux_binprm *);
111extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
112extern int flush_old_exec(struct linux_binprm * bprm);
113extern void setup_new_exec(struct linux_binprm * bprm);
114
115extern int suid_dumpable;
116#define SUID_DUMP_DISABLE 0 /* No setuid dumping */
117#define SUID_DUMP_USER 1 /* Dump as user of process */
118#define SUID_DUMP_ROOT 2 /* Dump as root */
119
120/* Stack area protections */
121#define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */
122#define EXSTACK_DISABLE_X 1 /* Disable executable stacks */
123#define EXSTACK_ENABLE_X 2 /* Enable executable stacks */
124
125extern int setup_arg_pages(struct linux_binprm * bprm,
126 unsigned long stack_top,
127 int executable_stack);
128extern int bprm_mm_init(struct linux_binprm *bprm);
129extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
130extern int prepare_bprm_creds(struct linux_binprm *bprm);
131extern void install_exec_creds(struct linux_binprm *bprm);
132extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
133extern void set_binfmt(struct linux_binfmt *new);
134extern void free_bprm(struct linux_binprm *);
135
136#endif /* __KERNEL__ */
137#endif /* _LINUX_BINFMTS_H */