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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_SECCOMP_H
2#define _LINUX_SECCOMP_H
3
Will Drewrye2cfabdf2012-04-12 16:47:57 -05004#include <linux/compiler.h>
5#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
Will Drewrye2cfabdf2012-04-12 16:47:57 -05007
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.
Will Drewryacf3b2c2012-04-12 16:47:59 -050015 * The bottom 16-bits are for optional return data.
Will Drewrye2cfabdf2012-04-12 16:47:57 -050016 * 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 */
Will Drewrybb6ea432012-04-12 16:48:01 -050022#define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */
Will Drewryacf3b2c2012-04-12 16:47:59 -050023#define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */
Will Drewryfb0fadf2012-04-12 16:48:02 -050024#define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */
Will Drewrye2cfabdf2012-04-12 16:47:57 -050025#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__
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#ifdef CONFIG_SECCOMP
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/thread_info.h>
51#include <asm/seccomp.h>
52
Will Drewrye2cfabdf2012-04-12 16:47:57 -050053struct seccomp_filter;
54/**
55 * struct seccomp - the state of a seccomp'ed process
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 */
Will Drewry932eceb2012-04-12 16:47:54 -050065struct seccomp {
66 int mode;
Will Drewrye2cfabdf2012-04-12 16:47:57 -050067 struct seccomp_filter *filter;
Will Drewry932eceb2012-04-12 16:47:54 -050068};
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Will Drewryacf3b2c2012-04-12 16:47:59 -050070extern int __secure_computing(int);
71static inline int secure_computing(int this_syscall)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072{
73 if (unlikely(test_thread_flag(TIF_SECCOMP)))
Will Drewryacf3b2c2012-04-12 16:47:59 -050074 return __secure_computing(this_syscall);
75 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77
Andrea Arcangeli1d9d02f2007-07-15 23:41:32 -070078extern long prctl_get_seccomp(void);
Will Drewrye2cfabdf2012-04-12 16:47:57 -050079extern long prctl_set_seccomp(unsigned long, char __user *);
Andrea Arcangeli1d9d02f2007-07-15 23:41:32 -070080
Will Drewry932eceb2012-04-12 16:47:54 -050081static inline int seccomp_mode(struct seccomp *s)
Andy Lutomirski5cec93c2011-06-05 13:50:24 -040082{
83 return s->mode;
84}
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086#else /* CONFIG_SECCOMP */
87
Ralf Baechle42a17ad2009-04-18 11:30:56 +020088#include <linux/errno.h>
89
Will Drewry932eceb2012-04-12 16:47:54 -050090struct seccomp { };
Will Drewrye2cfabdf2012-04-12 16:47:57 -050091struct seccomp_filter { };
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Stephen Rothwellb1fa6502012-04-17 12:08:48 +100093static inline int secure_computing(int this_syscall) { return 0; }
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Andrea Arcangeli1d9d02f2007-07-15 23:41:32 -070095static inline long prctl_get_seccomp(void)
96{
97 return -EINVAL;
98}
99
Will Drewrye2cfabdf2012-04-12 16:47:57 -0500100static inline long prctl_set_seccomp(unsigned long arg2, char __user *arg3)
Andrea Arcangeli1d9d02f2007-07-15 23:41:32 -0700101{
102 return -EINVAL;
103}
104
Will Drewry932eceb2012-04-12 16:47:54 -0500105static inline int seccomp_mode(struct seccomp *s)
Andy Lutomirski5cec93c2011-06-05 13:50:24 -0400106{
107 return 0;
108}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#endif /* CONFIG_SECCOMP */
110
Will Drewrye2cfabdf2012-04-12 16:47:57 -0500111#ifdef CONFIG_SECCOMP_FILTER
112extern void put_seccomp_filter(struct task_struct *tsk);
113extern void get_seccomp_filter(struct task_struct *tsk);
114extern u32 seccomp_bpf_load(int off);
115#else /* CONFIG_SECCOMP_FILTER */
116static inline void put_seccomp_filter(struct task_struct *tsk)
117{
118 return;
119}
120static inline void get_seccomp_filter(struct task_struct *tsk)
121{
122 return;
123}
124#endif /* CONFIG_SECCOMP_FILTER */
125#endif /* __KERNEL__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126#endif /* _LINUX_SECCOMP_H */