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 /* Function parameter for binfmt->coredump */
71 struct coredump_params {
76 unsigned long mm_flags;
80 * This structure defines the functions that are used to load the binary formats that
85 struct module *module;
86 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs);
87 int (*load_shlib)(struct file *);
88 int (*core_dump)(struct coredump_params *cprm);
89 unsigned long min_coredump; /* minimal dump size */
92 extern int __register_binfmt(struct linux_binfmt *fmt, int insert);
94 /* Registration of default binfmt handlers */
95 static inline int register_binfmt(struct linux_binfmt *fmt)
97 return __register_binfmt(fmt, 0);
99 /* Same as above, but adds a new binfmt at the top of the list */
100 static inline int insert_binfmt(struct linux_binfmt *fmt)
102 return __register_binfmt(fmt, 1);
105 extern void unregister_binfmt(struct linux_binfmt *);
107 extern int prepare_binprm(struct linux_binprm *);
108 extern int __must_check remove_arg_zero(struct linux_binprm *);
109 extern int search_binary_handler(struct linux_binprm *, struct pt_regs *);
110 extern int flush_old_exec(struct linux_binprm * bprm);
111 extern void setup_new_exec(struct linux_binprm * bprm);
112 extern void would_dump(struct linux_binprm *, struct file *);
114 extern int suid_dumpable;
116 /* Stack area protections */
117 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */
118 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */
119 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */
121 extern int setup_arg_pages(struct linux_binprm * bprm,
122 unsigned long stack_top,
123 int executable_stack);
124 extern int bprm_mm_init(struct linux_binprm *bprm);
125 extern int bprm_change_interp(char *interp, struct linux_binprm *bprm);
126 extern int copy_strings_kernel(int argc, const char *const *argv,
127 struct linux_binprm *bprm);
128 extern int prepare_bprm_creds(struct linux_binprm *bprm);
129 extern void install_exec_creds(struct linux_binprm *bprm);
130 extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
131 extern void set_binfmt(struct linux_binfmt *new);
132 extern void free_bprm(struct linux_binprm *);
134 #endif /* __KERNEL__ */
135 #endif /* _LINUX_BINFMTS_H */