1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_BINFMTS_H
3 #define _LINUX_BINFMTS_H
5 #include <linux/sched.h>
6 #include <linux/unistd.h>
8 #include <uapi/linux/binfmts.h>
11 struct coredump_params;
13 #define CORENAME_MAX_SIZE 128
16 * This structure is used to hold the arguments that are used when loading binaries.
20 struct vm_area_struct *vma;
21 unsigned long vma_pages;
23 # define MAX_ARG_PAGES 32
24 struct page *page[MAX_ARG_PAGES];
27 unsigned long p; /* current top of mem */
28 unsigned long argmin; /* rlimit marker for copy_strings() */
30 /* Should an execfd be passed to userspace? */
33 /* Use the creds of a script (see binfmt_misc) */
36 * Set by bprm_creds_for_exec hook to indicate a
37 * privilege-gaining exec has happened. Used to set
38 * AT_SECURE auxv for glibc.
42 * Set when errors can no longer be returned to the
49 struct file *executable; /* Executable to pass to the interpreter */
50 struct file *interpreter;
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 const char *fdpath; /* generated filename for execveat */
61 unsigned interp_flags;
62 int execfd; /* File descriptor of the executable */
63 unsigned long loader, exec;
65 struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */
67 char buf[BINPRM_BUF_SIZE];
70 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
71 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
73 /* filename of the binary will be inaccessible after exec */
74 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2
75 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT)
77 /* preserve argv0 for the interpreter */
78 #define BINPRM_FLAGS_PRESERVE_ARGV0_BIT 3
79 #define BINPRM_FLAGS_PRESERVE_ARGV0 (1 << BINPRM_FLAGS_PRESERVE_ARGV0_BIT)
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 *);
89 int (*load_shlib)(struct file *);
90 #ifdef CONFIG_COREDUMP
91 int (*core_dump)(struct coredump_params *cprm);
92 unsigned long min_coredump; /* minimal dump size */
96 extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
98 /* Registration of default binfmt handlers */
99 static inline void register_binfmt(struct linux_binfmt *fmt)
101 __register_binfmt(fmt, 0);
103 /* Same as above, but adds a new binfmt at the top of the list */
104 static inline void insert_binfmt(struct linux_binfmt *fmt)
106 __register_binfmt(fmt, 1);
109 extern void unregister_binfmt(struct linux_binfmt *);
111 extern int __must_check remove_arg_zero(struct linux_binprm *);
112 extern int begin_new_exec(struct linux_binprm * bprm);
113 extern void setup_new_exec(struct linux_binprm * bprm);
114 extern void finalize_exec(struct linux_binprm *bprm);
115 extern void would_dump(struct linux_binprm *, struct file *);
117 extern int suid_dumpable;
119 /* Stack area protections */
120 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */
121 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */
122 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */
124 extern int setup_arg_pages(struct linux_binprm * bprm,
125 unsigned long stack_top,
126 int executable_stack);
127 extern int transfer_args_to_stack(struct linux_binprm *bprm,
128 unsigned long *sp_location);
129 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm);
130 int copy_string_kernel(const char *arg, struct linux_binprm *bprm);
131 extern void set_binfmt(struct linux_binfmt *new);
132 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
134 int kernel_execve(const char *filename,
135 const char *const *argv, const char *const *envp);
137 #endif /* _LINUX_BINFMTS_H */