sandbox: Add support for the new seccomp() system call in kernel 3.17.

sandbox/linux/seccomp-bpf/linux_seccomp.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__
 #define SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__
 
 // The Seccomp2 kernel ABI is not part of older versions of glibc.
 // As we can't break compilation with these versions of the library,
 // we explicitly define all missing symbols.
@@ skipping 73 matching lines @@
 
 // In order to build will older tool chains, we currently have to avoid
 // including <linux/seccomp.h>. Until that can be fixed (if ever). Rely on
 // our own definitions of the seccomp kernel ABI.
 #ifndef SECCOMP_MODE_FILTER
 #define SECCOMP_MODE_DISABLED         0
 #define SECCOMP_MODE_STRICT           1
 #define SECCOMP_MODE_FILTER           2  // User user-supplied filter
 #endif
 
+#ifndef SECCOMP_SET_MODE_STRICT
+#define SECCOMP_SET_MODE_STRICT 0
+#endif
+#ifndef SECCOMP_SET_MODE_FILTER
+#define SECCOMP_SET_MODE_FILTER 1
+#endif
+#ifndef SECCOMP_FILTER_FLAG_TSYNC
+#define SECCOMP_FILTER_FLAG_TSYNC 1
+#endif
+
 #ifndef SECCOMP_RET_KILL
 // Return values supported for BPF filter programs. Please note that the
 // "illegal" SECCOMP_RET_INVALID is not supported by the kernel, should only
 // ever be used internally, and would result in the kernel killing our process.
 #define SECCOMP_RET_KILL    0x00000000U  // Kill the task immediately
 #define SECCOMP_RET_INVALID 0x00010000U  // Illegal return value
 #define SECCOMP_RET_TRAP    0x00030000U  // Disallow and force a SIGSYS
 #define SECCOMP_RET_ERRNO   0x00050000U  // Returns an errno
 #define SECCOMP_RET_TRACE   0x7ff00000U  // Pass to a tracer or disallow
 #define SECCOMP_RET_ALLOW   0x7fff0000U  // Allow
@@ skipping 249 matching lines @@
 #define SECCOMP_PT_PARM2(_regs)   (_regs).REG_a1
 #define SECCOMP_PT_PARM3(_regs)   (_regs).REG_a2
 #define SECCOMP_PT_PARM4(_regs)   (_regs).REG_a3
 
 #else
 #error Unsupported target platform
 
 #endif
 
 #endif  // SANDBOX_LINUX_SECCOMP_BPF_LINUX_SECCOMP_H__