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 unsigned long vma_pages;
33#else
34# define MAX_ARG_PAGES 32
35 struct page *page[MAX_ARG_PAGES];
36#endif
37 struct mm_struct *mm;
38 unsigned long p; /* current top of mem */
39 unsigned int
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 const char * filename; /* Name of binary as seen by procps */
55 const 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
63extern void acct_arg_size(struct linux_binprm *bprm, unsigned long pages);
64extern struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
65 int write);
66
67#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
68#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
69
70/* fd of the binary should be passed to the interpreter */
71#define BINPRM_FLAGS_EXECFD_BIT 1
72#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
73
74#define BINPRM_MAX_RECURSION 4
75
76/* Function parameter for binfmt->coredump */
77struct coredump_params {
78 long signr;
79 struct pt_regs *regs;
80 struct file *file;
81 unsigned long limit;
82 unsigned long mm_flags;
83};
84
85/*
86 * This structure defines the functions that are used to load the binary formats that
87 * linux accepts.
88 */
89struct linux_binfmt {
90 struct list_head lh;
91 struct module *module;
92 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs);
93 int (*load_shlib)(struct file *);
94 int (*core_dump)(struct coredump_params *cprm);
95 unsigned long min_coredump; /* minimal dump size */
96 int hasvdso;
97};
98
99extern int __register_binfmt(struct linux_binfmt *fmt, int insert);
100
101/* Registration of default binfmt handlers */
102static inline int register_binfmt(struct linux_binfmt *fmt)
103{
104 return __register_binfmt(fmt, 0);
105}
106/* Same as above, but adds a new binfmt at the top of the list */
107static inline int insert_binfmt(struct linux_binfmt *fmt)
108{
109 return __register_binfmt(fmt, 1);
110}
111
112extern void unregister_binfmt(struct linux_binfmt *);
113
114extern int prepare_binprm(struct linux_binprm *);
115extern int __must_check remove_arg_zero(struct linux_binprm *);
116extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
117extern int flush_old_exec(struct linux_binprm * bprm);
118extern void setup_new_exec(struct linux_binprm * bprm);
119
120extern int suid_dumpable;
121#define SUID_DUMP_DISABLE 0 /* No setuid dumping */
122#define SUID_DUMP_USER 1 /* Dump as user of process */
123#define SUID_DUMP_ROOT 2 /* Dump as root */
124
125/* Stack area protections */
126#define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */
127#define EXSTACK_DISABLE_X 1 /* Disable executable stacks */
128#define EXSTACK_ENABLE_X 2 /* Enable executable stacks */
129
130extern int setup_arg_pages(struct linux_binprm * bprm,
131 unsigned long stack_top,
132 int executable_stack);
133extern int bprm_mm_init(struct linux_binprm *bprm);
134extern int copy_strings_kernel(int argc, const char *const *argv,
135 struct linux_binprm *bprm);
136extern int prepare_bprm_creds(struct linux_binprm *bprm);
137extern void install_exec_creds(struct linux_binprm *bprm);
138extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
139extern void set_binfmt(struct linux_binfmt *new);
140extern void free_bprm(struct linux_binprm *);
141
142#endif /* __KERNEL__ */
143#endif /* _LINUX_BINFMTS_H */