Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _LINUX_BINFMTS_H
2#define _LINUX_BINFMTS_H
3
4#include <linux/sched.h>
5#include <linux/unistd.h>
6#include <asm/exec.h>
7#include <uapi/linux/binfmts.h>
8
9struct filename;
10
11#define CORENAME_MAX_SIZE 128
12
13/*
14 * This structure is used to hold the arguments that are used when loading binaries.
15 */
16struct linux_binprm {
17 char buf[BINPRM_BUF_SIZE];
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 int
28 /*
29 * True after the bprm_set_creds hook has been called once
30 * (multiple calls can be made via prepare_binprm() for
31 * binfmt_script/misc).
32 */
33 called_set_creds:1,
34 /*
35 * True if most recent call to the commoncaps bprm_set_creds
36 * hook (due to multiple prepare_binprm() calls from the
37 * binfmt_script/misc handlers) resulted in elevated
38 * privileges.
39 */
40 cap_elevated:1,
41 /*
42 * Set by bprm_set_creds hook to indicate a privilege-gaining
43 * exec has happened. Used to sanitize execution environment
44 * and to set AT_SECURE auxv for glibc.
45 */
46 secureexec:1;
47#ifdef __alpha__
48 unsigned int taso:1;
49#endif
50 unsigned int recursion_depth; /* only for search_binary_handler() */
51 struct file * file;
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 */
55 int argc, envc;
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;
61 unsigned interp_data;
62 unsigned long loader, exec;
63} __randomize_layout;
64
65#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
66#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
67
68/* fd of the binary should be passed to the interpreter */
69#define BINPRM_FLAGS_EXECFD_BIT 1
70#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_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/* Function parameter for binfmt->coredump */
77struct coredump_params {
78 const siginfo_t *siginfo;
79 struct pt_regs *regs;
80 struct file *file;
81 unsigned long limit;
82 unsigned long mm_flags;
83 loff_t written;
84 loff_t pos;
85};
86
87/*
88 * This structure defines the functions that are used to load the binary formats that
89 * linux accepts.
90 */
91struct linux_binfmt {
92 struct list_head lh;
93 struct module *module;
94 int (*load_binary)(struct linux_binprm *);
95 int (*load_shlib)(struct file *);
96 int (*core_dump)(struct coredump_params *cprm);
97 unsigned long min_coredump; /* minimal dump size */
98} __randomize_layout;
99
100extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
101
102/* Registration of default binfmt handlers */
103static inline void register_binfmt(struct linux_binfmt *fmt)
104{
105 __register_binfmt(fmt, 0);
106}
107/* Same as above, but adds a new binfmt at the top of the list */
108static inline void insert_binfmt(struct linux_binfmt *fmt)
109{
110 __register_binfmt(fmt, 1);
111}
112
113extern void unregister_binfmt(struct linux_binfmt *);
114
115extern int prepare_binprm(struct linux_binprm *);
116extern int __must_check remove_arg_zero(struct linux_binprm *);
117extern int search_binary_handler(struct linux_binprm *);
118extern int flush_old_exec(struct linux_binprm * bprm);
119extern void setup_new_exec(struct linux_binprm * bprm);
120extern void would_dump(struct linux_binprm *, struct file *);
121
122extern int suid_dumpable;
123
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 */
128
129extern int setup_arg_pages(struct linux_binprm * bprm,
130 unsigned long stack_top,
131 int executable_stack);
132extern int transfer_args_to_stack(struct linux_binprm *bprm,
133 unsigned long *sp_location);
134extern int bprm_change_interp(char *interp, struct linux_binprm *bprm);
135extern int copy_strings_kernel(int argc, const char *const *argv,
136 struct linux_binprm *bprm);
137extern int prepare_bprm_creds(struct linux_binprm *bprm);
138extern void install_exec_creds(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
142extern int do_execve(struct filename *,
143 const char __user * const __user *,
144 const char __user * const __user *);
145extern int do_execveat(int, struct filename *,
146 const char __user * const __user *,
147 const char __user * const __user *,
148 int);
149
150#endif /* _LINUX_BINFMTS_H */