82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
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/*
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* seccomp example for x86 (32-bit and 64-bit) with BPF macros
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*
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* Copyright (c) 2012 The Chromium OS Authors <chromium-os-dev@chromium.org>
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* Authors:
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* Will Drewry <wad@chromium.org>
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* Kees Cook <keescook@chromium.org>
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*
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* The code may be used by anyone for any purpose, and can serve as a
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* starting point for developing applications using mode 2 seccomp.
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*/
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#ifndef _SECCOMP_BPF_H_
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#define _SECCOMP_BPF_H_
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#define _GNU_SOURCE 1
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/prctl.h>
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#ifndef PR_SET_NO_NEW_PRIVS
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# define PR_SET_NO_NEW_PRIVS 38
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#endif
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#include <linux/unistd.h>
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#include <linux/audit.h>
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#include <linux/filter.h>
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#ifdef HAVE_LINUX_SECCOMP_H
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# include <linux/seccomp.h>
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#endif
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#ifndef SECCOMP_MODE_FILTER
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# define SECCOMP_MODE_FILTER 2 /* uses user-supplied filter. */
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# define SECCOMP_RET_KILL 0x00000000U /* kill the task immediately */
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# define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */
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# define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */
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struct seccomp_data {
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int nr;
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__u32 arch;
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__u64 instruction_pointer;
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__u64 args[6];
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};
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#endif
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#ifndef SYS_SECCOMP
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# define SYS_SECCOMP 1
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#endif
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#define syscall_nr (offsetof(struct seccomp_data, nr))
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#define arch_nr (offsetof(struct seccomp_data, arch))
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#if defined(__i386__)
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# define REG_SYSCALL REG_EAX
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# define ARCH_NR AUDIT_ARCH_I386
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#elif defined(__x86_64__)
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# define REG_SYSCALL REG_RAX
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# define ARCH_NR AUDIT_ARCH_X86_64
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#else
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# warning "Platform does not support seccomp filter yet"
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# define REG_SYSCALL 0
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# define ARCH_NR 0
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#endif
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#define VALIDATE_ARCHITECTURE \
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BPF_STMT(BPF_LD+BPF_W+BPF_ABS, arch_nr), \
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BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, ARCH_NR, 1, 0), \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL)
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#define EXAMINE_SYSCALL \
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BPF_STMT(BPF_LD+BPF_W+BPF_ABS, syscall_nr)
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#define ALLOW_SYSCALL(name) \
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BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
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#define KILL_PROCESS \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL)
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#endif /* _SECCOMP_BPF_H_ */
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