1/* 2 * seccomp example for x86 (32-bit and 64-bit) with BPF macros 3 * 4 * Copyright (c) 2012 The Chromium OS Authors <chromium-os-dev@chromium.org> 5 * Authors: 6 * Will Drewry <wad@chromium.org> 7 * Kees Cook <keescook@chromium.org> 8 * 9 * Use of this source code is governed by a BSD-style license that can be 10 * found in the LICENSE file. 11 * 12 * A stripped down version of the file found in this tutorial: http://outflux.net/teach-seccomp/. 13 */ 14#ifndef _SECCOMP_BPF_H_ 15#define _SECCOMP_BPF_H_ 16 17#define _GNU_SOURCE 1 18#include <stdio.h> 19#include <stddef.h> 20#include <stdlib.h> 21#include <errno.h> 22#include <signal.h> 23#include <string.h> 24#include <unistd.h> 25 26#include <sys/prctl.h> 27#ifndef PR_SET_NO_NEW_PRIVS 28# define PR_SET_NO_NEW_PRIVS 38 29#endif 30 31#include <linux/unistd.h> 32#include <linux/audit.h> 33#include <linux/filter.h> 34#ifdef HAVE_LINUX_SECCOMP_H 35# include <linux/seccomp.h> 36#endif 37#ifndef SECCOMP_MODE_FILTER 38# define SECCOMP_MODE_FILTER 2 /* uses user-supplied filter. */ 39# define SECCOMP_RET_KILL 0x00000000U /* kill the task immediately */ 40# define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */ 41# define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */ 42struct seccomp_data { 43 int nr; 44 __u32 arch; 45 __u64 instruction_pointer; 46 __u64 args[6]; 47}; 48#endif 49#ifndef SYS_SECCOMP 50# define SYS_SECCOMP 1 51#endif 52 53#define syscall_nr (offsetof(struct seccomp_data, nr)) 54 55#define EXAMINE_SYSCALL \ 56 BPF_STMT(BPF_LD+BPF_W+BPF_ABS, syscall_nr) 57 58#define ALLOW_SYSCALL(name) \ 59 BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \ 60 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW) 61 62#define KILL_PROCESS \ 63 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL) 64 65#endif /* _SECCOMP_BPF_H_ */ 66