Linux sandbox: move system call sets to sandbox/

Extract system call sets from content/ and move them to sandbox.

This is a re-land of https://codereview.chromium.org/103323003/.

BUG=325535
TBR=jorgelo@chromium.org

Review URL: https://codereview.chromium.org/105913002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238842 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 1094 insertions, 0 deletions

diff --git a/sandbox/linux/sandbox_linux.gypi b/sandbox/linux/sandbox_linux.gypi
index abbf32e..097df5b 100644
--- a/sandbox/linux/sandbox_linux.gypi
+++ b/sandbox/linux/sandbox_linux.gypi
@@ -58,6 +58,7 @@
         [ 'compile_seccomp_bpf==1', {
           'dependencies': [
             'seccomp_bpf',
+            'seccomp_bpf_helpers',
           ],
         }],
       ],
@@ -127,6 +128,19 @@
       ],
     },
     {
+      'target_name': 'seccomp_bpf_helpers',
+      'type': 'static_library',
+      'sources': [
+        'seccomp-bpf-helpers/syscall_sets.cc',
+        'seccomp-bpf-helpers/syscall_sets.h',
+      ],
+      'dependencies': [
+      ],
+      'include_dirs': [
+        '../..',
+      ],
+    },
+    {
       # A demonstration program for the seccomp-bpf sandbox.
       'target_name': 'seccomp_bpf_demo',
       'conditions': [
diff --git a/sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc b/sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc
new file mode 100644
index 0000000..98fe8bb
--- /dev/null
+++ b/sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc
@@ -0,0 +1,982 @@
+// Copyright (c) 2013 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.
+
+#include "sandbox/linux/seccomp-bpf-helpers/syscall_sets.h"
+
+#include "build/build_config.h"
+#include "sandbox/linux/services/linux_syscalls.h"
+
+namespace sandbox {
+
+// The functions below cover all existing i386, x86_64, and ARM system calls;
+// excluding syscalls made obsolete in ARM EABI.
+// The implicitly defined sets form a partition of the sets of
+// system calls.
+
+// TODO(jln) we need to restrict the first parameter!
+bool IsKill(int sysno) {
+  switch (sysno) {
+    case __NR_kill:
+    case __NR_tkill:
+    case __NR_tgkill:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsAllowedGettime(int sysno) {
+  switch (sysno) {
+    case __NR_clock_gettime:
+    case __NR_gettimeofday:
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_time:
+#endif
+      return true;
+    case __NR_adjtimex:         // Privileged.
+    case __NR_clock_adjtime:    // Privileged.
+    case __NR_clock_getres:     // Could be allowed.
+    case __NR_clock_nanosleep:  // Could be allowed.
+    case __NR_clock_settime:    // Privileged.
+#if defined(__i386__)
+    case __NR_ftime:            // Obsolete.
+#endif
+    case __NR_settimeofday:     // Privileged.
+#if defined(__i386__)
+    case __NR_stime:
+#endif
+    default:
+      return false;
+  }
+}
+
+bool IsCurrentDirectory(int sysno) {
+  switch (sysno)  {
+    case __NR_getcwd:
+    case __NR_chdir:
+    case __NR_fchdir:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsUmask(int sysno) {
+  switch (sysno) {
+    case __NR_umask:
+      return true;
+    default:
+      return false;
+  }
+}
+
+// System calls that directly access the file system. They might acquire
+// a new file descriptor or otherwise perform an operation directly
+// via a path.
+// Both EPERM and ENOENT are valid errno unless otherwise noted in comment.
+bool IsFileSystem(int sysno) {
+  switch (sysno) {
+    case __NR_access:          // EPERM not a valid errno.
+    case __NR_chmod:
+    case __NR_chown:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_chown32:
+#endif
+    case __NR_creat:
+    case __NR_execve:
+    case __NR_faccessat:       // EPERM not a valid errno.
+    case __NR_fchmodat:
+    case __NR_fchownat:        // Should be called chownat ?
+#if defined(__x86_64__)
+    case __NR_newfstatat:      // fstatat(). EPERM not a valid errno.
+#elif defined(__i386__) || defined(__arm__)
+    case __NR_fstatat64:
+#endif
+    case __NR_futimesat:       // Should be called utimesat ?
+    case __NR_lchown:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_lchown32:
+#endif
+    case __NR_link:
+    case __NR_linkat:
+    case __NR_lookup_dcookie:  // ENOENT not a valid errno.
+    case __NR_lstat:           // EPERM not a valid errno.
+#if defined(__i386__)
+    case __NR_oldlstat:
+#endif
+#if defined(__i386__) || defined(__arm__)
+    case __NR_lstat64:
+#endif
+    case __NR_mkdir:
+    case __NR_mkdirat:
+    case __NR_mknod:
+    case __NR_mknodat:
+    case __NR_open:
+    case __NR_openat:
+    case __NR_readlink:        // EPERM not a valid errno.
+    case __NR_readlinkat:
+    case __NR_rename:
+    case __NR_renameat:
+    case __NR_rmdir:
+    case __NR_stat:            // EPERM not a valid errno.
+#if defined(__i386__)
+    case __NR_oldstat:
+#endif
+#if defined(__i386__) || defined(__arm__)
+    case __NR_stat64:
+#endif
+    case __NR_statfs:          // EPERM not a valid errno.
+#if defined(__i386__) || defined(__arm__)
+    case __NR_statfs64:
+#endif
+    case __NR_symlink:
+    case __NR_symlinkat:
+    case __NR_truncate:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_truncate64:
+#endif
+    case __NR_unlink:
+    case __NR_unlinkat:
+    case __NR_uselib:          // Neither EPERM, nor ENOENT are valid errno.
+    case __NR_ustat:           // Same as above. Deprecated.
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_utime:
+#endif
+    case __NR_utimensat:       // New.
+    case __NR_utimes:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsAllowedFileSystemAccessViaFd(int sysno) {
+  switch (sysno) {
+    case __NR_fstat:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_fstat64:
+#endif
+      return true;
+    // TODO(jln): these should be denied gracefully as well (moved below).
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_fadvise64:        // EPERM not a valid errno.
+#endif
+#if defined(__i386__)
+    case __NR_fadvise64_64:
+#endif
+#if defined(__arm__)
+    case __NR_arm_fadvise64_64:
+#endif
+    case __NR_fdatasync:        // EPERM not a valid errno.
+    case __NR_flock:            // EPERM not a valid errno.
+    case __NR_fstatfs:          // Give information about the whole filesystem.
+#if defined(__i386__) || defined(__arm__)
+    case __NR_fstatfs64:
+#endif
+    case __NR_fsync:            // EPERM not a valid errno.
+#if defined(__i386__)
+    case __NR_oldfstat:
+#endif
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_sync_file_range:      // EPERM not a valid errno.
+#elif defined(__arm__)
+    case __NR_arm_sync_file_range:  // EPERM not a valid errno.
+#endif
+    default:
+      return false;
+  }
+}
+
+// EPERM is a good errno for any of these.
+bool IsDeniedFileSystemAccessViaFd(int sysno) {
+  switch (sysno) {
+    case __NR_fallocate:
+    case __NR_fchmod:
+    case __NR_fchown:
+    case __NR_ftruncate:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_fchown32:
+    case __NR_ftruncate64:
+#endif
+    case __NR_getdents:         // EPERM not a valid errno.
+    case __NR_getdents64:       // EPERM not a valid errno.
+#if defined(__i386__)
+    case __NR_readdir:
+#endif
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsGetSimpleId(int sysno) {
+  switch (sysno) {
+    case __NR_capget:
+    case __NR_getegid:
+    case __NR_geteuid:
+    case __NR_getgid:
+    case __NR_getgroups:
+    case __NR_getpid:
+    case __NR_getppid:
+    case __NR_getresgid:
+    case __NR_getsid:
+    case __NR_gettid:
+    case __NR_getuid:
+    case __NR_getresuid:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_getegid32:
+    case __NR_geteuid32:
+    case __NR_getgid32:
+    case __NR_getgroups32:
+    case __NR_getresgid32:
+    case __NR_getresuid32:
+    case __NR_getuid32:
+#endif
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsProcessPrivilegeChange(int sysno) {
+  switch (sysno) {
+    case __NR_capset:
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_ioperm:  // Intel privilege.
+    case __NR_iopl:    // Intel privilege.
+#endif
+    case __NR_setfsgid:
+    case __NR_setfsuid:
+    case __NR_setgid:
+    case __NR_setgroups:
+    case __NR_setregid:
+    case __NR_setresgid:
+    case __NR_setresuid:
+    case __NR_setreuid:
+    case __NR_setuid:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_setfsgid32:
+    case __NR_setfsuid32:
+    case __NR_setgid32:
+    case __NR_setgroups32:
+    case __NR_setregid32:
+    case __NR_setresgid32:
+    case __NR_setresuid32:
+    case __NR_setreuid32:
+    case __NR_setuid32:
+#endif
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsProcessGroupOrSession(int sysno) {
+  switch (sysno) {
+    case __NR_setpgid:
+    case __NR_getpgrp:
+    case __NR_setsid:
+    case __NR_getpgid:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsAllowedSignalHandling(int sysno) {
+  switch (sysno) {
+    case __NR_rt_sigaction:
+    case __NR_rt_sigprocmask:
+    case __NR_rt_sigreturn:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_sigaction:
+    case __NR_sigprocmask:
+    case __NR_sigreturn:
+#endif
+      return true;
+    case __NR_rt_sigpending:
+    case __NR_rt_sigqueueinfo:
+    case __NR_rt_sigsuspend:
+    case __NR_rt_sigtimedwait:
+    case __NR_rt_tgsigqueueinfo:
+    case __NR_sigaltstack:
+    case __NR_signalfd:
+    case __NR_signalfd4:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_sigpending:
+    case __NR_sigsuspend:
+#endif
+#if defined(__i386__)
+    case __NR_signal:
+    case __NR_sgetmask:  // Obsolete.
+    case __NR_ssetmask:
+#endif
+    default:
+      return false;
+  }
+}
+
+bool IsAllowedOperationOnFd(int sysno) {
+  switch (sysno) {
+    case __NR_close:
+    case __NR_dup:
+    case __NR_dup2:
+    case __NR_dup3:
+#if defined(__x86_64__) || defined(__arm__)
+    case __NR_shutdown:
+#endif
+      return true;
+    case __NR_fcntl:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_fcntl64:
+#endif
+    default:
+      return false;
+  }
+}
+
+bool IsKernelInternalApi(int sysno) {
+  switch (sysno) {
+    case __NR_restart_syscall:
+#if defined(__arm__)
+    case __ARM_NR_cmpxchg:
+#endif
+      return true;
+    default:
+      return false;
+  }
+}
+
+// This should be thought through in conjunction with IsFutex().
+bool IsAllowedProcessStartOrDeath(int sysno) {
+  switch (sysno) {
+    case __NR_clone:  // TODO(jln): restrict flags.
+    case __NR_exit:
+    case __NR_exit_group:
+    case __NR_wait4:
+    case __NR_waitid:
+#if defined(__i386__)
+    case __NR_waitpid:
+#endif
+      return true;
+    case __NR_setns:  // Privileged.
+    case __NR_fork:
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_get_thread_area:
+    case __NR_set_thread_area:
+#endif
+    case __NR_set_tid_address:
+    case __NR_unshare:
+    case __NR_vfork:
+    default:
+      return false;
+  }
+}
+
+// It's difficult to restrict those, but there is attack surface here.
+bool IsFutex(int sysno) {
+  switch (sysno) {
+    case __NR_futex:
+    case __NR_get_robust_list:
+    case __NR_set_robust_list:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsAllowedEpoll(int sysno) {
+  switch (sysno) {
+    case __NR_epoll_create:
+    case __NR_epoll_create1:
+    case __NR_epoll_ctl:
+    case __NR_epoll_wait:
+      return true;
+    default:
+#if defined(__x86_64__)
+    case __NR_epoll_ctl_old:
+#endif
+    case __NR_epoll_pwait:
+#if defined(__x86_64__)
+    case __NR_epoll_wait_old:
+#endif
+      return false;
+  }
+}
+
+bool IsAllowedGetOrModifySocket(int sysno) {
+  switch (sysno) {
+    case __NR_pipe:
+    case __NR_pipe2:
+      return true;
+    default:
+#if defined(__x86_64__) || defined(__arm__)
+    case __NR_socketpair:  // We will want to inspect its argument.
+#endif
+      return false;
+  }
+}
+
+bool IsDeniedGetOrModifySocket(int sysno) {
+  switch (sysno) {
+#if defined(__x86_64__) || defined(__arm__)
+    case __NR_accept:
+    case __NR_accept4:
+    case __NR_bind:
+    case __NR_connect:
+    case __NR_socket:
+    case __NR_listen:
+      return true;
+#endif
+    default:
+      return false;
+  }
+}
+
+#if defined(__i386__)
+// Big multiplexing system call for sockets.
+bool IsSocketCall(int sysno) {
+  switch (sysno) {
+    case __NR_socketcall:
+      return true;
+    default:
+      return false;
+  }
+}
+#endif
+
+#if defined(__x86_64__) || defined(__arm__)
+bool IsNetworkSocketInformation(int sysno) {
+  switch (sysno) {
+    case __NR_getpeername:
+    case __NR_getsockname:
+    case __NR_getsockopt:
+    case __NR_setsockopt:
+      return true;
+    default:
+      return false;
+  }
+}
+#endif
+
+bool IsAllowedAddressSpaceAccess(int sysno) {
+  switch (sysno) {
+    case __NR_brk:
+    case __NR_mlock:
+    case __NR_munlock:
+    case __NR_munmap:
+      return true;
+    case __NR_madvise:
+    case __NR_mincore:
+    case __NR_mlockall:
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_mmap:
+#endif
+#if defined(__i386__) || defined(__arm__)
+    case __NR_mmap2:
+#endif
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_modify_ldt:
+#endif
+    case __NR_mprotect:
+    case __NR_mremap:
+    case __NR_msync:
+    case __NR_munlockall:
+    case __NR_readahead:
+    case __NR_remap_file_pages:
+#if defined(__i386__)
+    case __NR_vm86:
+    case __NR_vm86old:
+#endif
+    default:
+      return false;
+  }
+}
+
+bool IsAllowedGeneralIo(int sysno) {
+  switch (sysno) {
+    case __NR_lseek:
+#if defined(__i386__) || defined(__arm__)
+    case __NR__llseek:
+#endif
+    case __NR_poll:
+    case __NR_ppoll:
+    case __NR_pselect6:
+    case __NR_read:
+    case __NR_readv:
+#if defined(__arm__)
+    case __NR_recv:
+#endif
+#if defined(__x86_64__) || defined(__arm__)
+    case __NR_recvfrom:  // Could specify source.
+    case __NR_recvmsg:   // Could specify source.
+#endif
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_select:
+#endif
+#if defined(__i386__) || defined(__arm__)
+    case __NR__newselect:
+#endif
+#if defined(__arm__)
+    case __NR_send:
+#endif
+#if defined(__x86_64__) || defined(__arm__)
+    case __NR_sendmsg:   // Could specify destination.
+    case __NR_sendto:    // Could specify destination.
+#endif
+    case __NR_write:
+    case __NR_writev:
+      return true;
+    case __NR_ioctl:     // Can be very powerful.
+    case __NR_pread64:
+    case __NR_preadv:
+    case __NR_pwrite64:
+    case __NR_pwritev:
+    case __NR_recvmmsg:  // Could specify source.
+    case __NR_sendfile:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_sendfile64:
+#endif
+    case __NR_sendmmsg:  // Could specify destination.
+    case __NR_splice:
+    case __NR_tee:
+    case __NR_vmsplice:
+    default:
+      return false;
+  }
+}
+
+bool IsAllowedPrctl(int sysno) {
+  switch (sysno) {
+    case __NR_prctl:
+      return true;
+    default:
+#if defined(__x86_64__)
+    case __NR_arch_prctl:
+#endif
+      return false;
+  }
+}
+
+bool IsAllowedBasicScheduler(int sysno) {
+  switch (sysno) {
+    case __NR_sched_yield:
+    case __NR_pause:
+    case __NR_nanosleep:
+      return true;
+    case __NR_getpriority:
+#if defined(__i386__) || defined(__arm__)
+    case __NR_nice:
+#endif
+    case __NR_setpriority:
+    default:
+      return false;
+  }
+}
+
+bool IsAdminOperation(int sysno) {
+  switch (sysno) {
+#if defined(__i386__) || defined(__arm__)
+    case __NR_bdflush:
+#endif
+    case __NR_kexec_load:
+    case __NR_reboot:
+    case __NR_setdomainname:
+    case __NR_sethostname:
+    case __NR_syslog:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsKernelModule(int sysno) {
+  switch (sysno) {
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_create_module:
+    case __NR_get_kernel_syms:  // Should ENOSYS.
+    case __NR_query_module:
+#endif
+    case __NR_delete_module:
+    case __NR_init_module:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsGlobalFSViewChange(int sysno) {
+  switch (sysno) {
+    case __NR_pivot_root:
+    case __NR_chroot:
+    case __NR_sync:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsFsControl(int sysno) {
+  switch (sysno) {
+    case __NR_mount:
+    case __NR_nfsservctl:
+    case __NR_quotactl:
+    case __NR_swapoff:
+    case __NR_swapon:
+#if defined(__i386__)
+    case __NR_umount:
+#endif
+    case __NR_umount2:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsNuma(int sysno) {
+  switch (sysno) {
+    case __NR_get_mempolicy:
+    case __NR_getcpu:
+    case __NR_mbind:
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_migrate_pages:
+#endif
+    case __NR_move_pages:
+    case __NR_set_mempolicy:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsMessageQueue(int sysno) {
+  switch (sysno) {
+    case __NR_mq_getsetattr:
+    case __NR_mq_notify:
+    case __NR_mq_open:
+    case __NR_mq_timedreceive:
+    case __NR_mq_timedsend:
+    case __NR_mq_unlink:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsGlobalProcessEnvironment(int sysno) {
+  switch (sysno) {
+    case __NR_acct:         // Privileged.
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_getrlimit:
+#endif
+#if defined(__i386__) || defined(__arm__)
+    case __NR_ugetrlimit:
+#endif
+#if defined(__i386__)
+    case __NR_ulimit:
+#endif
+    case __NR_getrusage:
+    case __NR_personality:  // Can change its personality as well.
+    case __NR_prlimit64:    // Like setrlimit / getrlimit.
+    case __NR_setrlimit:
+    case __NR_times:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsDebug(int sysno) {
+  switch (sysno) {
+    case __NR_ptrace:
+    case __NR_process_vm_readv:
+    case __NR_process_vm_writev:
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_kcmp:
+#endif
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsGlobalSystemStatus(int sysno) {
+  switch (sysno) {
+    case __NR__sysctl:
+    case __NR_sysfs:
+    case __NR_sysinfo:
+    case __NR_uname:
+#if defined(__i386__)
+    case __NR_olduname:
+    case __NR_oldolduname:
+#endif
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsEventFd(int sysno) {
+  switch (sysno) {
+    case __NR_eventfd:
+    case __NR_eventfd2:
+      return true;
+    default:
+      return false;
+  }
+}
+
+// Asynchronous I/O API.
+bool IsAsyncIo(int sysno) {
+  switch (sysno) {
+    case __NR_io_cancel:
+    case __NR_io_destroy:
+    case __NR_io_getevents:
+    case __NR_io_setup:
+    case __NR_io_submit:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsKeyManagement(int sysno) {
+  switch (sysno) {
+    case __NR_add_key:
+    case __NR_keyctl:
+    case __NR_request_key:
+      return true;
+    default:
+      return false;
+  }
+}
+
+#if defined(__x86_64__) || defined(__arm__)
+bool IsSystemVSemaphores(int sysno) {
+  switch (sysno) {
+    case __NR_semctl:
+    case __NR_semget:
+    case __NR_semop:
+    case __NR_semtimedop:
+      return true;
+    default:
+      return false;
+  }
+}
+#endif
+
+#if defined(__x86_64__) || defined(__arm__)
+// These give a lot of ambient authority and bypass the setuid sandbox.
+bool IsSystemVSharedMemory(int sysno) {
+  switch (sysno) {
+    case __NR_shmat:
+    case __NR_shmctl:
+    case __NR_shmdt:
+    case __NR_shmget:
+      return true;
+    default:
+      return false;
+  }
+}
+#endif
+
+#if defined(__x86_64__) || defined(__arm__)
+bool IsSystemVMessageQueue(int sysno) {
+  switch (sysno) {
+    case __NR_msgctl:
+    case __NR_msgget:
+    case __NR_msgrcv:
+    case __NR_msgsnd:
+      return true;
+    default:
+      return false;
+  }
+}
+#endif
+
+#if defined(__i386__)
+// Big system V multiplexing system call.
+bool IsSystemVIpc(int sysno) {
+  switch (sysno) {
+    case __NR_ipc:
+      return true;
+    default:
+      return false;
+  }
+}
+#endif
+
+bool IsAnySystemV(int sysno) {
+#if defined(__x86_64__) || defined(__arm__)
+  return IsSystemVMessageQueue(sysno) ||
+         IsSystemVSemaphores(sysno) ||
+         IsSystemVSharedMemory(sysno);
+#elif defined(__i386__)
+  return IsSystemVIpc(sysno);
+#endif
+}
+
+bool IsAdvancedScheduler(int sysno) {
+  switch (sysno) {
+    case __NR_ioprio_get:  // IO scheduler.
+    case __NR_ioprio_set:
+    case __NR_sched_get_priority_max:
+    case __NR_sched_get_priority_min:
+    case __NR_sched_getaffinity:
+    case __NR_sched_getparam:
+    case __NR_sched_getscheduler:
+    case __NR_sched_rr_get_interval:
+    case __NR_sched_setaffinity:
+    case __NR_sched_setparam:
+    case __NR_sched_setscheduler:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsInotify(int sysno) {
+  switch (sysno) {
+    case __NR_inotify_add_watch:
+    case __NR_inotify_init:
+    case __NR_inotify_init1:
+    case __NR_inotify_rm_watch:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsFaNotify(int sysno) {
+  switch (sysno) {
+    case __NR_fanotify_init:
+    case __NR_fanotify_mark:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsTimer(int sysno) {
+  switch (sysno) {
+    case __NR_getitimer:
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_alarm:
+#endif
+    case __NR_setitimer:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsAdvancedTimer(int sysno) {
+  switch (sysno) {
+    case __NR_timer_create:
+    case __NR_timer_delete:
+    case __NR_timer_getoverrun:
+    case __NR_timer_gettime:
+    case __NR_timer_settime:
+    case __NR_timerfd_create:
+    case __NR_timerfd_gettime:
+    case __NR_timerfd_settime:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsExtendedAttributes(int sysno) {
+  switch (sysno) {
+    case __NR_fgetxattr:
+    case __NR_flistxattr:
+    case __NR_fremovexattr:
+    case __NR_fsetxattr:
+    case __NR_getxattr:
+    case __NR_lgetxattr:
+    case __NR_listxattr:
+    case __NR_llistxattr:
+    case __NR_lremovexattr:
+    case __NR_lsetxattr:
+    case __NR_removexattr:
+    case __NR_setxattr:
+      return true;
+    default:
+      return false;
+  }
+}
+
+// Various system calls that need to be researched.
+// TODO(jln): classify this better.
+bool IsMisc(int sysno) {
+  switch (sysno) {
+    case __NR_name_to_handle_at:
+    case __NR_open_by_handle_at:
+    case __NR_perf_event_open:
+    case __NR_syncfs:
+    case __NR_vhangup:
+    // The system calls below are not implemented.
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_afs_syscall:
+#endif
+#if defined(__i386__)
+    case __NR_break:
+#endif
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_getpmsg:
+#endif
+#if defined(__i386__)
+    case __NR_gtty:
+    case __NR_idle:
+    case __NR_lock:
+    case __NR_mpx:
+    case __NR_prof:
+    case __NR_profil:
+#endif
+#if defined(__i386__) || defined(__x86_64__)
+    case __NR_putpmsg:
+#endif
+#if defined(__x86_64__)
+    case __NR_security:
+#endif
+#if defined(__i386__)
+    case __NR_stty:
+#endif
+#if defined(__x86_64__)
+    case __NR_tuxcall:
+#endif
+    case __NR_vserver:
+      return true;
+    default:
+      return false;
+  }
+}
+
+#if defined(__arm__)
+bool IsArmPciConfig(int sysno) {
+  switch (sysno) {
+    case __NR_pciconfig_iobase:
+    case __NR_pciconfig_read:
+    case __NR_pciconfig_write:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool IsArmPrivate(int sysno) {
+  switch (sysno) {
+    case __ARM_NR_breakpoint:
+    case __ARM_NR_cacheflush:
+    case __ARM_NR_set_tls:
+    case __ARM_NR_usr26:
+    case __ARM_NR_usr32:
+      return true;
+    default:
+      return false;
+  }
+}
+#endif  // defined(__arm__)
+
+}  // namespace sandbox.
diff --git a/sandbox/linux/seccomp-bpf-helpers/syscall_sets.h b/sandbox/linux/seccomp-bpf-helpers/syscall_sets.h
new file mode 100644
index 0000000..dd1fc01
--- /dev/null
+++ b/sandbox/linux/seccomp-bpf-helpers/syscall_sets.h
@@ -0,0 +1,98 @@
+// Copyright (c) 2013 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_HELPERS_H_
+#define SANDBOX_LINUX_SECCOMP_BPF_HELPERS_H_
+
+#include "build/build_config.h"
+
+// These are helpers to build seccomp-bpf policies, i.e. policies for a
+// sandbox that reduces the Linux kernel's attack surface. Given their
+// nature, they don't have any clear semantics and are completely
+// "implementation-defined".
+
+namespace sandbox {
+
+bool IsKill(int sysno);
+bool IsAllowedGettime(int sysno);
+bool IsCurrentDirectory(int sysno);
+bool IsUmask(int sysno);
+// System calls that directly access the file system. They might acquire
+// a new file descriptor or otherwise perform an operation directly
+// via a path.
+bool IsFileSystem(int sysno);
+bool IsAllowedFileSystemAccessViaFd(int sysno);
+bool IsDeniedFileSystemAccessViaFd(int sysno);
+bool IsGetSimpleId(int sysno);
+bool IsProcessPrivilegeChange(int sysno);
+bool IsProcessGroupOrSession(int sysno);
+bool IsAllowedSignalHandling(int sysno);
+bool IsAllowedOperationOnFd(int sysno);
+bool IsKernelInternalApi(int sysno);
+// This should be thought through in conjunction with IsFutex().
+bool IsAllowedProcessStartOrDeath(int sysno);
+// It's difficult to restrict those, but there is attack surface here.
+bool IsFutex(int sysno);
+bool IsAllowedEpoll(int sysno);
+bool IsAllowedGetOrModifySocket(int sysno);
+bool IsDeniedGetOrModifySocket(int sysno);
+
+#if defined(__i386__)
+// Big multiplexing system call for sockets.
+bool IsSocketCall(int sysno);
+#endif
+
+#if defined(__x86_64__) || defined(__arm__)
+bool IsNetworkSocketInformation(int sysno);
+#endif
+
+bool IsAllowedAddressSpaceAccess(int sysno);
+bool IsAllowedGeneralIo(int sysno);
+bool IsAllowedPrctl(int sysno);
+bool IsAllowedBasicScheduler(int sysno);
+bool IsAdminOperation(int sysno);
+bool IsKernelModule(int sysno);
+bool IsGlobalFSViewChange(int sysno);
+bool IsFsControl(int sysno);
+bool IsNuma(int sysno);
+bool IsMessageQueue(int sysno);
+bool IsGlobalProcessEnvironment(int sysno);
+bool IsDebug(int sysno);
+bool IsGlobalSystemStatus(int sysno);
+bool IsEventFd(int sysno);
+// Asynchronous I/O API.
+bool IsAsyncIo(int sysno);
+bool IsKeyManagement(int sysno);
+#if defined(__x86_64__) || defined(__arm__)
+bool IsSystemVSemaphores(int sysno);
+#endif
+#if defined(__x86_64__) || defined(__arm__)
+// These give a lot of ambient authority and bypass the setuid sandbox.
+bool IsSystemVSharedMemory(int sysno);
+#endif
+
+#if defined(__x86_64__) || defined(__arm__)
+#endif
+
+#if defined(__i386__)
+// Big system V multiplexing system call.
+bool IsSystemVIpc(int sysno);
+#endif
+
+bool IsAnySystemV(int sysno);
+bool IsAdvancedScheduler(int sysno);
+bool IsInotify(int sysno);
+bool IsFaNotify(int sysno);
+bool IsTimer(int sysno);
+bool IsAdvancedTimer(int sysno);
+bool IsExtendedAttributes(int sysno);
+bool IsMisc(int sysno);
+#if defined(__arm__)
+bool IsArmPciConfig(int sysno);
+bool IsArmPrivate(int sysno);
+#endif  // defined(__arm__)
+
+}  // namespace sandbox.
+
+#endif  // SANDBOX_LINUX_SECCOMP_BPF_HELPERS_H_