Reland: Add seccomp sandbox for non-SFI NaCl

components/nacl/loader/nonsfi/nonsfi_sandbox_unittest.cc

+// Copyright 2014 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 "components/nacl/loader/nonsfi/nonsfi_sandbox.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <sched.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/prctl.h>
+#include <sys/ptrace.h>
+#include <sys/socket.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "base/files/scoped_file.h"
+#include "base/logging.h"
+#include "base/posix/eintr_wrapper.h"
+#include "sandbox/linux/seccomp-bpf-helpers/sigsys_handlers.h"
+#include "sandbox/linux/seccomp-bpf/bpf_tests.h"
+
+namespace {
+
+void DoPipe(base::ScopedFD* fds) {
+  int tmp_fds[2];
+  BPF_ASSERT_EQ(0, pipe(tmp_fds));
+  fds[0].reset(tmp_fds[0]);
+  fds[1].reset(tmp_fds[1]);
+}
+
+void DoSocketpair(base::ScopedFD* fds) {
+  int tmp_fds[2];
+  BPF_ASSERT_EQ(0, socketpair(AF_UNIX, SOCK_STREAM, 0, tmp_fds));
+  fds[0].reset(tmp_fds[0]);
+  fds[1].reset(tmp_fds[1]);
+}
+
+TEST(NaClNonSfiSandboxTest, BPFIsSupported) {
+  bool seccomp_bpf_supported = false;
+  // Seccomp-BPF tests die under TSAN v2. See http://crbug.com/356588
+#if !defined(THREAD_SANITIZER)
+  seccomp_bpf_supported = (
+      sandbox::SandboxBPF::SupportsSeccompSandbox(-1) ==
+      sandbox::SandboxBPF::STATUS_AVAILABLE);
+#endif
+
+  if (!seccomp_bpf_supported) {
+    LOG(ERROR) << "Seccomp BPF is not supported, these tests "
+               << "will pass without running";
+  }
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, invalid_sysno,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  syscall(999);
+}
+
+// To make this test pass, we need to allow sched_getaffinity and
+// mmap. We just disable this test not to complicate the sandbox.
+#if !defined(ADDRESS_SANITIZER)
+const int kExpectedValue = 123;
+
+void* SetValueInThread(void* test_val_ptr) {
+  *reinterpret_cast<int*>(test_val_ptr) = kExpectedValue;
+  return NULL;
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, clone_by_pthread_create,

[jln (very slow on Chromium), 2014/04/17 18:34:17]

sandbox/linux/tests/unit_tests.h provides DISABLE_ON_TSAN().

You could create DISABLE_ON_ASAN and use that instead.

[hamaji, 2014/04/17 19:13:43]

Done.

+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  // clone call for thread creation is allowed.
+  pthread_t th;
+  int test_val = 42;
+  BPF_ASSERT_EQ(0, pthread_create(&th, NULL, &SetValueInThread, &test_val));
+  BPF_ASSERT_EQ(0, pthread_join(th, NULL));
+  BPF_ASSERT_EQ(kExpectedValue, test_val);
+}
+#endif
+
+int DoFork() {
+  // Call clone() to do a fork().
+  const int pid = syscall(__NR_clone, SIGCHLD, NULL);
+  if (pid == 0)
+    _exit(0);
+  return pid;
+}
+
+// The sanity check for DoFork without the sandbox.
+TEST(NaClNonSfiSandboxTest, DoFork) {
+  const int pid = DoFork();
+  ASSERT_LT(0, pid);
+  int status;
+  ASSERT_EQ(pid, HANDLE_EINTR(waitpid(pid, &status, 0)));
+  ASSERT_TRUE(WIFEXITED(status));
+  ASSERT_EQ(0, WEXITSTATUS(status));
+}
+
+// Then, try this in the sandbox.
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, clone_for_fork,
+               DEATH_MESSAGE(sandbox::GetCloneErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  DoFork();
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, prctl_SET_NAME,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_prctl, PR_SET_NAME, "foo"));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, prctl_SET_DUMPABLE,
+               DEATH_MESSAGE(sandbox::GetPrctlErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  syscall(__NR_prctl, PR_SET_DUMPABLE, 1UL);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, socketcall_allowed,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  base::ScopedFD fds[2];
+  struct msghdr msg = {};
+  struct iovec iov;
+  std::string payload("foo");
+  iov.iov_base = &payload[0];
+  iov.iov_len = payload.size();
+  msg.msg_iov = &iov;
+  msg.msg_iovlen = 1;
+  DoSocketpair(fds);
+  BPF_ASSERT_EQ(static_cast<int>(payload.size()),
+                HANDLE_EINTR(sendmsg(fds[1].get(), &msg, 0)));
+  BPF_ASSERT_EQ(static_cast<int>(payload.size()),
+                HANDLE_EINTR(recvmsg(fds[0].get(), &msg, 0)));
+  BPF_ASSERT_EQ(0, shutdown(fds[0].get(), SHUT_RDWR));
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, accept,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  accept(0, NULL, NULL);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, bind,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  bind(0, NULL, 0);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, connect,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  connect(0, NULL, 0);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, getpeername,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  getpeername(0, NULL, NULL);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, getsockname,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  socklen_t addrlen = 0;
+  getsockname(0, NULL, &addrlen);

[hamaji, 2014/04/17 18:25:36]

It seems ASan checks the memory the third argument points to. Passing a more
realistic value would harm nothing.

[jln (very slow on Chromium), 2014/04/17 18:34:17]

It probably doesn't hurt to make the second argument non NULL as well, in case
ASAN adds new improvements.

[hamaji, 2014/04/17 19:13:43]

Done.

+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, getsockopt,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  getsockopt(0, 0, 0, NULL, NULL);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, listen,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  listen(0, 0);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, recv,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  recv(0, NULL, 0, 0);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, recvfrom,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  recvfrom(0, NULL, 0, 0, NULL, NULL);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, send,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  send(0, NULL, 0, 0);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, sendto,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  sendto(0, NULL, 0, 0, NULL, 0);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, setsockopt,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  setsockopt(0, 0, 0, NULL, 0);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, socket,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  socket(0, 0, 0);
+}
+
+#if defined(__x86_64__) || defined(__arm__)
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, socketpair,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  int fds[2];
+  socketpair(AF_INET, SOCK_STREAM, 0, fds);
+}
+#endif
+
+BPF_TEST(NaClNonSfiSandboxTest, fcntl_SETFD_allowed,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  base::ScopedFD fds[2];
+  DoSocketpair(fds);
+  BPF_ASSERT_EQ(0, fcntl(fds[0].get(), F_SETFD, FD_CLOEXEC));
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, fcntl_SETFD,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  base::ScopedFD fds[2];
+  DoSocketpair(fds);
+  fcntl(fds[0].get(), F_SETFD, 99);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, fcntl_GETFL_SETFL_allowed,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  base::ScopedFD fds[2];
+  DoPipe(fds);
+  const int fd = fds[0].get();
+  BPF_ASSERT_EQ(0, fcntl(fd, F_GETFL));
+  BPF_ASSERT_EQ(0, fcntl(fd, F_SETFL, O_RDWR | O_NONBLOCK));
+  BPF_ASSERT_EQ(O_NONBLOCK, fcntl(fd, F_GETFL));
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, fcntl_GETFL_SETFL,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  base::ScopedFD fds[2];
+  DoSocketpair(fds);
+  fcntl(fds[0].get(), F_SETFL, O_APPEND);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, fcntl_DUPFD,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  fcntl(0, F_DUPFD);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, fcntl_DUPFD_CLOEXEC,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  fcntl(0, F_DUPFD_CLOEXEC);
+}
+
+void* DoAllowedAnonymousMmap() {
+  return mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE,
+              MAP_ANONYMOUS | MAP_SHARED, -1, 0);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, mmap_allowed,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  void* ptr = DoAllowedAnonymousMmap();
+  BPF_ASSERT_NE(MAP_FAILED, ptr);
+  BPF_ASSERT_EQ(0, munmap(ptr, getpagesize()));
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, mmap_unallowed_flag,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE,
+       MAP_ANONYMOUS | MAP_POPULATE, -1, 0);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, mmap_unallowed_prot,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  mmap(NULL, getpagesize(), PROT_READ | PROT_GROWSDOWN,
+       MAP_ANONYMOUS, -1, 0);
+}
+
+// TODO(hamaji): Disallow RWX mmap.
+#if 0
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, mmap_rwx,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE | PROT_EXEC,
+       MAP_ANONYMOUS, -1, 0);
+}
+#endif
+
+BPF_TEST(NaClNonSfiSandboxTest, mprotect_allowed,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  void* ptr = DoAllowedAnonymousMmap();
+  BPF_ASSERT_NE(MAP_FAILED, ptr);
+  BPF_ASSERT_EQ(0, mprotect(ptr, getpagesize(), PROT_READ));
+  BPF_ASSERT_EQ(0, munmap(ptr, getpagesize()));
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, mprotect_unallowed_prot,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  // We have tested DoAllowedAnonymousMmap is allowed in
+  // mmap_allowed, so we can make sure the following mprotect call
+  // kills the process.
+  void* ptr = DoAllowedAnonymousMmap();
+  BPF_ASSERT_NE(MAP_FAILED, ptr);
+  mprotect(ptr, getpagesize(), PROT_READ | PROT_GROWSDOWN);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, brk,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  char* next_brk = static_cast<char*>(sbrk(0)) + getpagesize();
+  // The kernel interface must return zero for brk.
+  BPF_ASSERT_EQ(0, syscall(__NR_brk, next_brk));
+  // The libc wrapper translates it to ENOMEM.
+  errno = 0;
+  BPF_ASSERT_EQ(-1, brk(next_brk));
+  BPF_ASSERT_EQ(ENOMEM, errno);
+}
+
+#if defined(__i386__) || defined(__arm__)
+BPF_TEST(NaClNonSfiSandboxTest, getegid32_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_getegid32));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, geteuid32_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_geteuid32));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, getgid32_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_getgid32));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, getuid32_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_getuid32));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, getegid_SIGSYS,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  syscall(__NR_getegid);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, geteuid_SIGSYS,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  syscall(__NR_geteuid);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, getgid_SIGSYS,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  syscall(__NR_getgid);
+}
+
+BPF_DEATH_TEST(NaClNonSfiSandboxTest, getuid_SIGSYS,
+               DEATH_MESSAGE(sandbox::GetErrorMessageContentForTests()),
+               nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  syscall(__NR_getuid);
+}
+#endif
+
+#if defined(__x86_64__)
+BPF_TEST(NaClNonSfiSandboxTest, getegid_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_getegid));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, geteuid_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_geteuid));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, getgid_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_getgid));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, getuid_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_getuid));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+#endif
+
+BPF_TEST(NaClNonSfiSandboxTest, madvise_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_madvise));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, open_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_open));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, ptrace_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_ptrace));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+BPF_TEST(NaClNonSfiSandboxTest, set_robust_list_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_set_robust_list));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+
+#if defined(__i386__) || defined(__x86_64__)
+BPF_TEST(NaClNonSfiSandboxTest, time_EPERM,
+         nacl::nonsfi::NaClNonSfiBPFSandboxPolicy::EvaluateSyscallImpl) {
+  errno = 0;
+  BPF_ASSERT_EQ(-1, syscall(__NR_time));
+  BPF_ASSERT_EQ(EPERM, errno);
+}
+#endif
+
+}  // namespace