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 unsigned interp_flags;
60 int execfd; /* File descriptor of the executable */
61 unsigned long loader, exec;
62
63 struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */
64
65 char buf[BINPRM_BUF_SIZE];
66} __randomize_layout;
67
68#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
69#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
70
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)
74
75/* Function parameter for binfmt->coredump */
76struct coredump_params {
77 const kernel_siginfo_t *siginfo;
78 struct pt_regs *regs;
79 struct file *file;
80 unsigned long limit;
81 unsigned long mm_flags;
82 loff_t written;
83 loff_t pos;
84};
85
86/*
87 * This structure defines the functions that are used to load the binary formats that
88 * linux accepts.
89 */
90struct linux_binfmt {
91 struct list_head lh;
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 */
97} __randomize_layout;
98
99extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
100
101/* Registration of default binfmt handlers */
102static inline void register_binfmt(struct linux_binfmt *fmt)
103{
104 __register_binfmt(fmt, 0);
105}
106/* Same as above, but adds a new binfmt at the top of the list */
107static inline void insert_binfmt(struct linux_binfmt *fmt)
108{
109 __register_binfmt(fmt, 1);
110}
111
112extern void unregister_binfmt(struct linux_binfmt *);
113
114extern int __must_check remove_arg_zero(struct linux_binprm *);
115extern int begin_new_exec(struct linux_binprm * bprm);
116extern void setup_new_exec(struct linux_binprm * bprm);
117extern void finalize_exec(struct linux_binprm *bprm);
118extern void would_dump(struct linux_binprm *, struct file *);
119
120extern int suid_dumpable;
121
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 */
126
127extern int setup_arg_pages(struct linux_binprm * bprm,
128 unsigned long stack_top,
129 int executable_stack);
130extern int transfer_args_to_stack(struct linux_binprm *bprm,
131 unsigned long *sp_location);
132extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm);
133int copy_string_kernel(const char *arg, struct linux_binprm *bprm);
134extern void set_binfmt(struct linux_binfmt *new);
135extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
136
137extern int do_execve(struct filename *,
138 const char __user * const __user *,
139 const char __user * const __user *);
140extern int do_execveat(int, struct filename *,
141 const char __user * const __user *,
142 const char __user * const __user *,
143 int);
144int do_execve_file(struct file *file, void *__argv, void *__envp);
145
146#endif /* _LINUX_BINFMTS_H */