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1da177e4 LT |
1 | #ifndef _LINUX_BINFMTS_H |
2 | #define _LINUX_BINFMTS_H | |
3 | ||
4 | #include <linux/capability.h> | |
5 | ||
6 | struct pt_regs; | |
7 | ||
8 | /* | |
b6a2fea3 OW |
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. | |
1da177e4 | 13 | */ |
b6a2fea3 OW |
14 | #define MAX_ARG_STRLEN (PAGE_SIZE * 32) |
15 | #define MAX_ARG_STRINGS 0x7FFFFFFF | |
1da177e4 LT |
16 | |
17 | /* sizeof(linux_binprm->buf) */ | |
18 | #define BINPRM_BUF_SIZE 128 | |
19 | ||
20 | #ifdef __KERNEL__ | |
96e02d15 | 21 | #include <linux/sched.h> |
282124d1 | 22 | #include <linux/unistd.h> |
826eba4d | 23 | #include <asm/exec.h> |
1da177e4 | 24 | |
71ce92f3 DA |
25 | #define CORENAME_MAX_SIZE 128 |
26 | ||
1da177e4 LT |
27 | /* |
28 | * This structure is used to hold the arguments that are used when loading binaries. | |
29 | */ | |
f670d0ec | 30 | struct linux_binprm { |
1da177e4 | 31 | char buf[BINPRM_BUF_SIZE]; |
b6a2fea3 OW |
32 | #ifdef CONFIG_MMU |
33 | struct vm_area_struct *vma; | |
3c77f845 | 34 | unsigned long vma_pages; |
b6a2fea3 OW |
35 | #else |
36 | # define MAX_ARG_PAGES 32 | |
1da177e4 | 37 | struct page *page[MAX_ARG_PAGES]; |
b6a2fea3 | 38 | #endif |
1da177e4 LT |
39 | struct mm_struct *mm; |
40 | unsigned long p; /* current top of mem */ | |
a50b0aa4 | 41 | unsigned int |
a6f76f23 DH |
42 | cred_prepared:1,/* true if creds already prepared (multiple |
43 | * preps happen for interpreters) */ | |
44 | cap_effective:1;/* true if has elevated effective capabilities, | |
45 | * false if not; except for init which inherits | |
46 | * its parent's caps anyway */ | |
53112488 KS |
47 | #ifdef __alpha__ |
48 | unsigned int taso:1; | |
49 | #endif | |
bf2a9a39 | 50 | unsigned int recursion_depth; |
1da177e4 | 51 | struct file * file; |
a6f76f23 DH |
52 | struct cred *cred; /* new credentials */ |
53 | int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ | |
54 | unsigned int per_clear; /* bits to clear in current->personality */ | |
1da177e4 | 55 | int argc, envc; |
d7627467 DH |
56 | const char * filename; /* Name of binary as seen by procps */ |
57 | const char * interp; /* Name of the binary really executed. Most | |
1da177e4 LT |
58 | of the time same as filename, but could be |
59 | different for binfmt_{misc,script} */ | |
60 | unsigned interp_flags; | |
61 | unsigned interp_data; | |
62 | unsigned long loader, exec; | |
96e02d15 | 63 | char tcomm[TASK_COMM_LEN]; |
1da177e4 LT |
64 | }; |
65 | ||
66 | #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 | |
67 | #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) | |
68 | ||
69 | /* fd of the binary should be passed to the interpreter */ | |
70 | #define BINPRM_FLAGS_EXECFD_BIT 1 | |
71 | #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) | |
72 | ||
bf2a9a39 | 73 | #define BINPRM_MAX_RECURSION 4 |
1da177e4 | 74 | |
f6151dfe MH |
75 | /* Function parameter for binfmt->coredump */ |
76 | struct coredump_params { | |
5ab1c309 | 77 | siginfo_t *siginfo; |
f6151dfe MH |
78 | struct pt_regs *regs; |
79 | struct file *file; | |
80 | unsigned long limit; | |
30736a4d | 81 | unsigned long mm_flags; |
f6151dfe MH |
82 | }; |
83 | ||
1da177e4 LT |
84 | /* |
85 | * This structure defines the functions that are used to load the binary formats that | |
86 | * linux accepts. | |
87 | */ | |
88 | struct linux_binfmt { | |
e4dc1b14 | 89 | struct list_head lh; |
1da177e4 LT |
90 | struct module *module; |
91 | int (*load_binary)(struct linux_binprm *, struct pt_regs * regs); | |
92 | int (*load_shlib)(struct file *); | |
f6151dfe | 93 | int (*core_dump)(struct coredump_params *cprm); |
1da177e4 LT |
94 | unsigned long min_coredump; /* minimal dump size */ |
95 | }; | |
96 | ||
8fc3dc5a | 97 | extern void __register_binfmt(struct linux_binfmt *fmt, int insert); |
74641f58 IK |
98 | |
99 | /* Registration of default binfmt handlers */ | |
8fc3dc5a | 100 | static inline void register_binfmt(struct linux_binfmt *fmt) |
74641f58 | 101 | { |
8fc3dc5a | 102 | __register_binfmt(fmt, 0); |
74641f58 IK |
103 | } |
104 | /* Same as above, but adds a new binfmt at the top of the list */ | |
8fc3dc5a | 105 | static inline void insert_binfmt(struct linux_binfmt *fmt) |
74641f58 | 106 | { |
8fc3dc5a | 107 | __register_binfmt(fmt, 1); |
74641f58 IK |
108 | } |
109 | ||
f6b450d4 | 110 | extern void unregister_binfmt(struct linux_binfmt *); |
1da177e4 LT |
111 | |
112 | extern int prepare_binprm(struct linux_binprm *); | |
b6a2fea3 | 113 | extern int __must_check remove_arg_zero(struct linux_binprm *); |
f670d0ec | 114 | extern int search_binary_handler(struct linux_binprm *, struct pt_regs *); |
1da177e4 | 115 | extern int flush_old_exec(struct linux_binprm * bprm); |
221af7f8 | 116 | extern void setup_new_exec(struct linux_binprm * bprm); |
1b5d783c | 117 | extern void would_dump(struct linux_binprm *, struct file *); |
1da177e4 | 118 | |
d6e71144 AC |
119 | extern int suid_dumpable; |
120 | #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ | |
121 | #define SUID_DUMP_USER 1 /* Dump as user of process */ | |
122 | #define SUID_DUMP_ROOT 2 /* Dump as root */ | |
123 | ||
1da177e4 LT |
124 | /* Stack area protections */ |
125 | #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ | |
126 | #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ | |
127 | #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ | |
128 | ||
129 | extern int setup_arg_pages(struct linux_binprm * bprm, | |
130 | unsigned long stack_top, | |
131 | int executable_stack); | |
b6a2fea3 | 132 | extern int bprm_mm_init(struct linux_binprm *bprm); |
d7627467 DH |
133 | extern int copy_strings_kernel(int argc, const char *const *argv, |
134 | struct linux_binprm *bprm); | |
a2a8474c | 135 | extern int prepare_bprm_creds(struct linux_binprm *bprm); |
a6f76f23 | 136 | extern void install_exec_creds(struct linux_binprm *bprm); |
964ee7df | 137 | extern void set_binfmt(struct linux_binfmt *new); |
08a6fac1 | 138 | extern void free_bprm(struct linux_binprm *); |
1da177e4 | 139 | |
282124d1 AV |
140 | #ifdef __ARCH_WANT_KERNEL_EXECVE |
141 | extern void ret_from_kernel_execve(struct pt_regs *normal) __noreturn; | |
142 | #endif | |
143 | ||
1da177e4 LT |
144 | #endif /* __KERNEL__ */ |
145 | #endif /* _LINUX_BINFMTS_H */ |