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>
12 #define CORENAME_MAX_SIZE 128
15 * This structure is used to hold the arguments that are used when loading binaries.
19 struct vm_area_struct *vma;
20 unsigned long vma_pages;
22 # define MAX_ARG_PAGES 32
23 struct page *page[MAX_ARG_PAGES];
26 unsigned long p; /* current top of mem */
27 unsigned long argmin; /* rlimit marker for copy_strings() */
29 /* Should an execfd be passed to userspace? */
32 /* Use the creds of a script (see binfmt_misc) */
35 * Set by bprm_creds_for_exec hook to indicate a
36 * privilege-gaining exec has happened. Used to set
37 * AT_SECURE auxv for glibc.
41 * Set when errors can no longer be returned to the
48 struct file * executable; /* Executable to pass to the interpreter */
49 struct file * interpreter;
51 struct cred *cred; /* new credentials */
52 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
53 unsigned int per_clear; /* bits to clear in current->personality */
55 const char * filename; /* Name of binary as seen by procps */
56 const char * interp; /* Name of the binary really executed. Most
57 of the time same as filename, but could be
58 different for binfmt_{misc,script} */
59 unsigned interp_flags;
60 int execfd; /* File descriptor of the executable */
61 unsigned long loader, exec;
63 struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */
65 char buf[BINPRM_BUF_SIZE];
68 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
69 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
71 /* filename of the binary will be inaccessible after exec */
72 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2
73 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT)
75 /* Function parameter for binfmt->coredump */
76 struct coredump_params {
77 const kernel_siginfo_t *siginfo;
81 unsigned long mm_flags;
87 * This structure defines the functions that are used to load the binary formats that
92 struct module *module;
93 int (*load_binary)(struct linux_binprm *);
94 int (*load_shlib)(struct file *);
95 int (*core_dump)(struct coredump_params *cprm);
96 unsigned long min_coredump; /* minimal dump size */
99 extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
101 /* Registration of default binfmt handlers */
102 static inline void register_binfmt(struct linux_binfmt *fmt)
104 __register_binfmt(fmt, 0);
106 /* Same as above, but adds a new binfmt at the top of the list */
107 static inline void insert_binfmt(struct linux_binfmt *fmt)
109 __register_binfmt(fmt, 1);
112 extern void unregister_binfmt(struct linux_binfmt *);
114 extern int __must_check remove_arg_zero(struct linux_binprm *);
115 extern int begin_new_exec(struct linux_binprm * bprm);
116 extern void setup_new_exec(struct linux_binprm * bprm);
117 extern void finalize_exec(struct linux_binprm *bprm);
118 extern void would_dump(struct linux_binprm *, struct file *);
120 extern int suid_dumpable;
122 /* Stack area protections */
123 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */
124 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */
125 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */
127 extern int setup_arg_pages(struct linux_binprm * bprm,
128 unsigned long stack_top,
129 int executable_stack);
130 extern int transfer_args_to_stack(struct linux_binprm *bprm,
131 unsigned long *sp_location);
132 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm);
133 int copy_string_kernel(const char *arg, struct linux_binprm *bprm);
134 extern void set_binfmt(struct linux_binfmt *new);
135 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
137 extern int do_execve(struct filename *,
138 const char __user * const __user *,
139 const char __user * const __user *);
140 extern int do_execveat(int, struct filename *,
141 const char __user * const __user *,
142 const char __user * const __user *,
144 int do_execve_file(struct file *file, void *__argv, void *__envp);
146 #endif /* _LINUX_BINFMTS_H */