aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/seccomp.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/seccomp.h')
-rw-r--r--include/linux/seccomp.h107
1 files changed, 94 insertions, 13 deletions
diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h
index cc7a4e9cc7ad..84f6320da50f 100644
--- a/include/linux/seccomp.h
+++ b/include/linux/seccomp.h
@@ -1,25 +1,90 @@
1#ifndef _LINUX_SECCOMP_H 1#ifndef _LINUX_SECCOMP_H
2#define _LINUX_SECCOMP_H 2#define _LINUX_SECCOMP_H
3 3
4 4#include <linux/compiler.h>
5#include <linux/types.h>
6
7
8/* Valid values for seccomp.mode and prctl(PR_SET_SECCOMP, <mode>) */
9#define SECCOMP_MODE_DISABLED 0 /* seccomp is not in use. */
10#define SECCOMP_MODE_STRICT 1 /* uses hard-coded filter. */
11#define SECCOMP_MODE_FILTER 2 /* uses user-supplied filter. */
12
13/*
14 * All BPF programs must return a 32-bit value.
15 * The bottom 16-bits are for optional return data.
16 * The upper 16-bits are ordered from least permissive values to most.
17 *
18 * The ordering ensures that a min_t() over composed return values always
19 * selects the least permissive choice.
20 */
21#define SECCOMP_RET_KILL 0x00000000U /* kill the task immediately */
22#define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */
23#define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */
24#define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */
25#define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */
26
27/* Masks for the return value sections. */
28#define SECCOMP_RET_ACTION 0x7fff0000U
29#define SECCOMP_RET_DATA 0x0000ffffU
30
31/**
32 * struct seccomp_data - the format the BPF program executes over.
33 * @nr: the system call number
34 * @arch: indicates system call convention as an AUDIT_ARCH_* value
35 * as defined in <linux/audit.h>.
36 * @instruction_pointer: at the time of the system call.
37 * @args: up to 6 system call arguments always stored as 64-bit values
38 * regardless of the architecture.
39 */
40struct seccomp_data {
41 int nr;
42 __u32 arch;
43 __u64 instruction_pointer;
44 __u64 args[6];
45};
46
47#ifdef __KERNEL__
5#ifdef CONFIG_SECCOMP 48#ifdef CONFIG_SECCOMP
6 49
7#include <linux/thread_info.h> 50#include <linux/thread_info.h>
8#include <asm/seccomp.h> 51#include <asm/seccomp.h>
9 52
10typedef struct { int mode; } seccomp_t; 53struct seccomp_filter;
11 54/**
12extern void __secure_computing(int); 55 * struct seccomp - the state of a seccomp'ed process
13static inline void secure_computing(int this_syscall) 56 *
57 * @mode: indicates one of the valid values above for controlled
58 * system calls available to a process.
59 * @filter: The metadata and ruleset for determining what system calls
60 * are allowed for a task.
61 *
62 * @filter must only be accessed from the context of current as there
63 * is no locking.
64 */
65struct seccomp {
66 int mode;
67 struct seccomp_filter *filter;
68};
69
70extern int __secure_computing(int);
71static inline int secure_computing(int this_syscall)
14{ 72{
15 if (unlikely(test_thread_flag(TIF_SECCOMP))) 73 if (unlikely(test_thread_flag(TIF_SECCOMP)))
16 __secure_computing(this_syscall); 74 return __secure_computing(this_syscall);
75 return 0;
76}
77
78/* A wrapper for architectures supporting only SECCOMP_MODE_STRICT. */
79static inline void secure_computing_strict(int this_syscall)
80{
81 BUG_ON(secure_computing(this_syscall) != 0);
17} 82}
18 83
19extern long prctl_get_seccomp(void); 84extern long prctl_get_seccomp(void);
20extern long prctl_set_seccomp(unsigned long); 85extern long prctl_set_seccomp(unsigned long, char __user *);
21 86
22static inline int seccomp_mode(seccomp_t *s) 87static inline int seccomp_mode(struct seccomp *s)
23{ 88{
24 return s->mode; 89 return s->mode;
25} 90}
@@ -28,25 +93,41 @@ static inline int seccomp_mode(seccomp_t *s)
28 93
29#include <linux/errno.h> 94#include <linux/errno.h>
30 95
31typedef struct { } seccomp_t; 96struct seccomp { };
97struct seccomp_filter { };
32 98
33#define secure_computing(x) do { } while (0) 99static inline int secure_computing(int this_syscall) { return 0; }
100static inline void secure_computing_strict(int this_syscall) { return; }
34 101
35static inline long prctl_get_seccomp(void) 102static inline long prctl_get_seccomp(void)
36{ 103{
37 return -EINVAL; 104 return -EINVAL;
38} 105}
39 106
40static inline long prctl_set_seccomp(unsigned long arg2) 107static inline long prctl_set_seccomp(unsigned long arg2, char __user *arg3)
41{ 108{
42 return -EINVAL; 109 return -EINVAL;
43} 110}
44 111
45static inline int seccomp_mode(seccomp_t *s) 112static inline int seccomp_mode(struct seccomp *s)
46{ 113{
47 return 0; 114 return 0;
48} 115}
49
50#endif /* CONFIG_SECCOMP */ 116#endif /* CONFIG_SECCOMP */
51 117
118#ifdef CONFIG_SECCOMP_FILTER
119extern void put_seccomp_filter(struct task_struct *tsk);
120extern void get_seccomp_filter(struct task_struct *tsk);
121extern u32 seccomp_bpf_load(int off);
122#else /* CONFIG_SECCOMP_FILTER */
123static inline void put_seccomp_filter(struct task_struct *tsk)
124{
125 return;
126}
127static inline void get_seccomp_filter(struct task_struct *tsk)
128{
129 return;
130}
131#endif /* CONFIG_SECCOMP_FILTER */
132#endif /* __KERNEL__ */
52#endif /* _LINUX_SECCOMP_H */ 133#endif /* _LINUX_SECCOMP_H */