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/sched.h>
22 #include <linux/unistd.h>
25 #define CORENAME_MAX_SIZE 128
28 * This structure is used to hold the arguments that are used when loading binaries.
31 char buf[BINPRM_BUF_SIZE];
33 struct vm_area_struct *vma;
34 unsigned long vma_pages;
36 # define MAX_ARG_PAGES 32
37 struct page *page[MAX_ARG_PAGES];
40 unsigned long p; /* current top of mem */
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 */
50 unsigned int recursion_depth;
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 */
56 const char * filename; /* Name of binary as seen by procps */
57 const char * interp; /* Name of the binary really executed. Most
58 of the time same as filename, but could be
59 different for binfmt_{misc,script} */
60 unsigned interp_flags;
62 unsigned long loader, exec;
63 char tcomm[TASK_COMM_LEN];
66 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
67 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
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)
73 #define BINPRM_MAX_RECURSION 4
75 /* Function parameter for binfmt->coredump */
76 struct coredump_params {
81 unsigned long mm_flags;
85 * This structure defines the functions that are used to load the binary formats that
90 struct module *module;
91 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs);
92 int (*load_shlib)(struct file *);
93 int (*core_dump)(struct coredump_params *cprm);
94 unsigned long min_coredump; /* minimal dump size */
97 extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
99 /* Registration of default binfmt handlers */
100 static inline void register_binfmt(struct linux_binfmt *fmt)
102 __register_binfmt(fmt, 0);
104 /* Same as above, but adds a new binfmt at the top of the list */
105 static inline void insert_binfmt(struct linux_binfmt *fmt)
107 __register_binfmt(fmt, 1);
110 extern void unregister_binfmt(struct linux_binfmt *);
112 extern int prepare_binprm(struct linux_binprm *);
113 extern int __must_check remove_arg_zero(struct linux_binprm *);
114 extern int search_binary_handler(struct linux_binprm *, struct pt_regs *);
115 extern int flush_old_exec(struct linux_binprm * bprm);
116 extern void setup_new_exec(struct linux_binprm * bprm);
117 extern void would_dump(struct linux_binprm *, struct file *);
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 */
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 */
129 extern int setup_arg_pages(struct linux_binprm * bprm,
130 unsigned long stack_top,
131 int executable_stack);
132 extern int bprm_mm_init(struct linux_binprm *bprm);
133 extern int copy_strings_kernel(int argc, const char *const *argv,
134 struct linux_binprm *bprm);
135 extern int prepare_bprm_creds(struct linux_binprm *bprm);
136 extern void install_exec_creds(struct linux_binprm *bprm);
137 extern void set_binfmt(struct linux_binfmt *new);
138 extern void free_bprm(struct linux_binprm *);
140 #ifdef __ARCH_WANT_KERNEL_EXECVE
141 extern void ret_from_kernel_execve(struct pt_regs *normal) __noreturn;
144 #endif /* __KERNEL__ */
145 #endif /* _LINUX_BINFMTS_H */