1 #ifndef _LINUX_BINFMTS_H
2 #define _LINUX_BINFMTS_H
4 #include <linux/capability.h>
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.
14 #define MAX_ARG_STRLEN (PAGE_SIZE * 32)
15 #define MAX_ARG_STRINGS 0x7FFFFFFF
17 /* sizeof(linux_binprm->buf) */
18 #define BINPRM_BUF_SIZE 128
21 #include <linux/list.h>
23 #define CORENAME_MAX_SIZE 128
26 * This structure is used to hold the arguments that are used when loading binaries.
29 char buf
[BINPRM_BUF_SIZE
];
31 struct vm_area_struct
*vma
;
32 unsigned long vma_pages
;
34 # define MAX_ARG_PAGES 32
35 struct page
*page
[MAX_ARG_PAGES
];
38 unsigned long p
; /* current top of mem */
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 */
48 unsigned int recursion_depth
;
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 */
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
;
60 unsigned long loader
, exec
;
63 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
64 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
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)
70 #define BINPRM_MAX_RECURSION 4
72 /* Function parameter for binfmt->coredump */
73 struct coredump_params
{
78 unsigned long mm_flags
;
82 * This structure defines the functions that are used to load the binary formats that
87 struct module
*module
;
88 int (*load_binary
)(struct linux_binprm
*, struct pt_regs
* regs
);
89 int (*load_shlib
)(struct file
*);
90 int (*core_dump
)(struct coredump_params
*cprm
);
91 unsigned long min_coredump
; /* minimal dump size */
94 extern int __register_binfmt(struct linux_binfmt
*fmt
, int insert
);
96 /* Registration of default binfmt handlers */
97 static inline int register_binfmt(struct linux_binfmt
*fmt
)
99 return __register_binfmt(fmt
, 0);
101 /* Same as above, but adds a new binfmt at the top of the list */
102 static inline int insert_binfmt(struct linux_binfmt
*fmt
)
104 return __register_binfmt(fmt
, 1);
107 extern void unregister_binfmt(struct linux_binfmt
*);
109 extern int prepare_binprm(struct linux_binprm
*);
110 extern int __must_check
remove_arg_zero(struct linux_binprm
*);
111 extern int search_binary_handler(struct linux_binprm
*, struct pt_regs
*);
112 extern int flush_old_exec(struct linux_binprm
* bprm
);
113 extern void setup_new_exec(struct linux_binprm
* bprm
);
114 extern void would_dump(struct linux_binprm
*, struct file
*);
116 extern int suid_dumpable
;
117 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */
118 #define SUID_DUMP_USER 1 /* Dump as user of process */
119 #define SUID_DUMP_ROOT 2 /* Dump as root */
121 /* Stack area protections */
122 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */
123 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */
124 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */
126 extern int setup_arg_pages(struct linux_binprm
* bprm
,
127 unsigned long stack_top
,
128 int executable_stack
);
129 extern int bprm_mm_init(struct linux_binprm
*bprm
);
130 extern int copy_strings_kernel(int argc
, const char *const *argv
,
131 struct linux_binprm
*bprm
);
132 extern int prepare_bprm_creds(struct linux_binprm
*bprm
);
133 extern void install_exec_creds(struct linux_binprm
*bprm
);
134 extern void do_coredump(long signr
, int exit_code
, struct pt_regs
*regs
);
135 extern void set_binfmt(struct linux_binfmt
*new);
136 extern void free_bprm(struct linux_binprm
*);
138 #endif /* __KERNEL__ */
139 #endif /* _LINUX_BINFMTS_H */
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