Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_BINFMTS_H
3#define _LINUX_BINFMTS_H
4
5#include <linux/sched.h>
6#include <linux/unistd.h>
7#include <asm/exec.h>
8#include <uapi/linux/binfmts.h>
9
10struct filename;
11
12#define CORENAME_MAX_SIZE 128
13
14/*
15 * This structure is used to hold the arguments that are used when loading binaries.
16 */
17struct linux_binprm {
18#ifdef CONFIG_MMU
19 struct vm_area_struct *vma;
20 unsigned long vma_pages;
21#else
22# define MAX_ARG_PAGES 32
23 struct page *page[MAX_ARG_PAGES];
24#endif
25 struct mm_struct *mm;
26 unsigned long p; /* current top of mem */
27 unsigned long argmin; /* rlimit marker for copy_strings() */
28 unsigned int
29 /* Should an execfd be passed to userspace? */
30 have_execfd:1,
31
32 /* Use the creds of a script (see binfmt_misc) */
33 execfd_creds:1,
34 /*
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.
38 */
39 secureexec:1,
40 /*
41 * Set when errors can no longer be returned to the
42 * original userspace.
43 */
44 point_of_no_return:1;
45#ifdef __alpha__
46 unsigned int taso:1;
47#endif
48 struct file *executable; /* Executable to pass to the interpreter */
49 struct file *interpreter;
50 struct file *file;
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 */
54 int argc, envc;
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 const char *fdpath; /* generated filename for execveat */
60 unsigned interp_flags;
61 int execfd; /* File descriptor of the executable */
62 unsigned long loader, exec;
63
64 struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */
65
66 char buf[BINPRM_BUF_SIZE];
67} __randomize_layout;
68
69#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
70#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
71
72/* filename of the binary will be inaccessible after exec */
73#define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2
74#define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT)
75
76/* preserve argv0 for the interpreter */
77#define BINPRM_FLAGS_PRESERVE_ARGV0_BIT 3
78#define BINPRM_FLAGS_PRESERVE_ARGV0 (1 << BINPRM_FLAGS_PRESERVE_ARGV0_BIT)
79
80/* Function parameter for binfmt->coredump */
81struct coredump_params {
82 const kernel_siginfo_t *siginfo;
83 struct pt_regs *regs;
84 struct file *file;
85 unsigned long limit;
86 unsigned long mm_flags;
87 loff_t written;
88 loff_t pos;
89};
90
91/*
92 * This structure defines the functions that are used to load the binary formats that
93 * linux accepts.
94 */
95struct linux_binfmt {
96 struct list_head lh;
97 struct module *module;
98 int (*load_binary)(struct linux_binprm *);
99 int (*load_shlib)(struct file *);
100 int (*core_dump)(struct coredump_params *cprm);
101 unsigned long min_coredump; /* minimal dump size */
102} __randomize_layout;
103
104extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
105
106/* Registration of default binfmt handlers */
107static inline void register_binfmt(struct linux_binfmt *fmt)
108{
109 __register_binfmt(fmt, 0);
110}
111/* Same as above, but adds a new binfmt at the top of the list */
112static inline void insert_binfmt(struct linux_binfmt *fmt)
113{
114 __register_binfmt(fmt, 1);
115}
116
117extern void unregister_binfmt(struct linux_binfmt *);
118
119extern int __must_check remove_arg_zero(struct linux_binprm *);
120extern int begin_new_exec(struct linux_binprm * bprm);
121extern void setup_new_exec(struct linux_binprm * bprm);
122extern void finalize_exec(struct linux_binprm *bprm);
123extern void would_dump(struct linux_binprm *, struct file *);
124
125extern int suid_dumpable;
126
127/* Stack area protections */
128#define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */
129#define EXSTACK_DISABLE_X 1 /* Disable executable stacks */
130#define EXSTACK_ENABLE_X 2 /* Enable executable stacks */
131
132extern int setup_arg_pages(struct linux_binprm * bprm,
133 unsigned long stack_top,
134 int executable_stack);
135extern int transfer_args_to_stack(struct linux_binprm *bprm,
136 unsigned long *sp_location);
137extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm);
138int copy_string_kernel(const char *arg, struct linux_binprm *bprm);
139extern void set_binfmt(struct linux_binfmt *new);
140extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
141
142int kernel_execve(const char *filename,
143 const char *const *argv, const char *const *envp);
144
145#endif /* _LINUX_BINFMTS_H */