21 files changed, 514 insertions, 156 deletions

diff --git a/test/syscalls/linux/32bit.cc b/test/syscalls/linux/32bit.cc
index c47a05181..3c825477c 100644
--- a/test/syscalls/linux/32bit.cc
+++ b/test/syscalls/linux/32bit.cc
@@ -74,7 +74,7 @@ void ExitGroup32(const char instruction[2], int code) {
       "int $3\n"
       :
       : [ code ] "m"(code), [ ip ] "d"(m.ptr())
-      : "rax", "rbx", "rsp");
+      : "rax", "rbx");
 }
 
 constexpr int kExitCode = 42;
diff --git a/test/syscalls/linux/BUILD b/test/syscalls/linux/BUILD
index 704bae17b..636e5db12 100644
--- a/test/syscalls/linux/BUILD
+++ b/test/syscalls/linux/BUILD
@@ -167,11 +167,6 @@ cc_library(
 )
 
 cc_library(
-    name = "temp_umask",
-    hdrs = ["temp_umask.h"],
-)
-
-cc_library(
     name = "unix_domain_socket_test_util",
     testonly = 1,
     srcs = ["unix_domain_socket_test_util.cc"],
@@ -608,7 +603,10 @@ cc_binary(
 cc_binary(
     name = "exceptions_test",
     testonly = 1,
-    srcs = ["exceptions.cc"],
+    srcs = select_arch(
+        amd64 = ["exceptions.cc"],
+        arm64 = [],
+    ),
     linkstatic = 1,
     deps = [
         gtest,
@@ -1140,11 +1138,11 @@ cc_binary(
     srcs = ["mkdir.cc"],
     linkstatic = 1,
     deps = [
-        ":temp_umask",
         "//test/util:capability_util",
         "//test/util:fs_util",
         gtest,
         "//test/util:temp_path",
+        "//test/util:temp_umask",
         "//test/util:test_main",
         "//test/util:test_util",
     ],
@@ -1299,12 +1297,12 @@ cc_binary(
     srcs = ["open_create.cc"],
     linkstatic = 1,
     deps = [
-        ":temp_umask",
         "//test/util:capability_util",
         "//test/util:file_descriptor",
         "//test/util:fs_util",
         gtest,
         "//test/util:temp_path",
+        "//test/util:temp_umask",
         "//test/util:test_main",
         "//test/util:test_util",
     ],
@@ -1475,7 +1473,10 @@ cc_binary(
 cc_binary(
     name = "arch_prctl_test",
     testonly = 1,
-    srcs = ["arch_prctl.cc"],
+    srcs = select_arch(
+        amd64 = ["arch_prctl.cc"],
+        arm64 = [],
+    ),
     linkstatic = 1,
     deps = [
         "//test/util:file_descriptor",
@@ -1631,6 +1632,19 @@ cc_binary(
 )
 
 cc_binary(
+    name = "proc_pid_oomscore_test",
+    testonly = 1,
+    srcs = ["proc_pid_oomscore.cc"],
+    linkstatic = 1,
+    deps = [
+        "//test/util:fs_util",
+        "//test/util:test_main",
+        "//test/util:test_util",
+        "@com_google_absl//absl/strings",
+    ],
+)
+
+cc_binary(
     name = "proc_pid_smaps_test",
     testonly = 1,
     srcs = ["proc_pid_smaps.cc"],
@@ -3322,7 +3336,10 @@ cc_binary(
 cc_binary(
     name = "sysret_test",
     testonly = 1,
-    srcs = ["sysret.cc"],
+    srcs = select_arch(
+        amd64 = ["sysret.cc"],
+        arm64 = [],
+    ),
     linkstatic = 1,
     deps = [
         gtest,
@@ -3460,6 +3477,18 @@ cc_binary(
     ],
 )
 
+cc_binary(
+    name = "tuntap_hostinet_test",
+    testonly = 1,
+    srcs = ["tuntap_hostinet.cc"],
+    linkstatic = 1,
+    deps = [
+        gtest,
+        "//test/util:test_main",
+        "//test/util:test_util",
+    ],
+)
+
 cc_library(
     name = "udp_socket_test_cases",
     testonly = 1,
@@ -3678,11 +3707,10 @@ cc_binary(
         ":socket_test_util",
         gtest,
         "//test/util:capability_util",
-        "//test/util:memory_util",
+        "//test/util:posix_error",
         "//test/util:test_main",
         "//test/util:test_util",
         "//test/util:thread_util",
-        "@com_google_absl//absl/synchronization",
     ],
 )
 
diff --git a/test/syscalls/linux/bad.cc b/test/syscalls/linux/bad.cc
index adfb149df..a26fc6af3 100644
--- a/test/syscalls/linux/bad.cc
+++ b/test/syscalls/linux/bad.cc
@@ -28,7 +28,7 @@ namespace {
 constexpr uint32_t kNotImplementedSyscall = SYS_get_kernel_syms;
 #elif __aarch64__
 // Use the last of arch_specific_syscalls which are not implemented on arm64.
-constexpr uint32_t kNotImplementedSyscall = SYS_arch_specific_syscall + 15;
+constexpr uint32_t kNotImplementedSyscall = __NR_arch_specific_syscall + 15;
 #endif
 
 TEST(BadSyscallTest, NotImplemented) {
diff --git a/test/syscalls/linux/dev.cc b/test/syscalls/linux/dev.cc
index 4e473268c..4dd302eed 100644
--- a/test/syscalls/linux/dev.cc
+++ b/test/syscalls/linux/dev.cc
@@ -153,13 +153,6 @@ TEST(DevTest, TTYExists) {
   EXPECT_EQ(statbuf.st_mode, S_IFCHR | 0666);
 }
 
-TEST(DevTest, NetTunExists) {
-  struct stat statbuf = {};
-  ASSERT_THAT(stat("/dev/net/tun", &statbuf), SyscallSucceeds());
-  // Check that it's a character device with rw-rw-rw- permissions.
-  EXPECT_EQ(statbuf.st_mode, S_IFCHR | 0666);
-}
-
 }  // namespace
 }  // namespace testing
 
diff --git a/test/syscalls/linux/mkdir.cc b/test/syscalls/linux/mkdir.cc
index cf138d328..def4c50a4 100644
--- a/test/syscalls/linux/mkdir.cc
+++ b/test/syscalls/linux/mkdir.cc
@@ -18,10 +18,10 @@
 #include <unistd.h>
 
 #include "gtest/gtest.h"
-#include "test/syscalls/linux/temp_umask.h"
 #include "test/util/capability_util.h"
 #include "test/util/fs_util.h"
 #include "test/util/temp_path.h"
+#include "test/util/temp_umask.h"
 #include "test/util/test_util.h"
 
 namespace gvisor {
diff --git a/test/syscalls/linux/network_namespace.cc b/test/syscalls/linux/network_namespace.cc
index 6ea48c263..133fdecf0 100644
--- a/test/syscalls/linux/network_namespace.cc
+++ b/test/syscalls/linux/network_namespace.cc
@@ -20,102 +20,33 @@
 
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
-#include "absl/synchronization/notification.h"
 #include "test/syscalls/linux/socket_test_util.h"
 #include "test/util/capability_util.h"
-#include "test/util/memory_util.h"
+#include "test/util/posix_error.h"
 #include "test/util/test_util.h"
 #include "test/util/thread_util.h"
 
 namespace gvisor {
 namespace testing {
-
 namespace {
 
-using TestFunc = std::function<PosixError()>;
-using RunFunc = std::function<PosixError(TestFunc)>;
-
-struct NamespaceStrategy {
-  RunFunc run;
-
-  static NamespaceStrategy Of(RunFunc run) {
-    NamespaceStrategy s;
-    s.run = run;
-    return s;
-  }
-};
+TEST(NetworkNamespaceTest, LoopbackExists) {
+  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)));
 
-PosixError RunWithUnshare(TestFunc fn) {
-  PosixError err = PosixError(-1, "function did not return a value");
   ScopedThread t([&] {
-    if (unshare(CLONE_NEWNET) != 0) {
-      err = PosixError(errno);
-      return;
-    }
-    err = fn();
-  });
-  t.Join();
-  return err;
-}
+    ASSERT_THAT(unshare(CLONE_NEWNET), SyscallSucceedsWithValue(0));
 
-PosixError RunWithClone(TestFunc fn) {
-  struct Args {
-    absl::Notification n;
-    TestFunc fn;
-    PosixError err;
-  };
-  Args args;
-  args.fn = fn;
-  args.err = PosixError(-1, "function did not return a value");
-
-  ASSIGN_OR_RETURN_ERRNO(
-      Mapping child_stack,
-      MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE));
-  pid_t child = clone(
-      +[](void *arg) {
-        Args *args = reinterpret_cast<Args *>(arg);
-        args->err = args->fn();
-        args->n.Notify();
-        syscall(SYS_exit, 0);  // Exit manually. No return address on stack.
-        return 0;
-      },
-      reinterpret_cast<void *>(child_stack.addr() + kPageSize),
-      CLONE_NEWNET | CLONE_THREAD | CLONE_SIGHAND | CLONE_VM, &args);
-  if (child < 0) {
-    return PosixError(errno, "clone() failed");
-  }
-  args.n.WaitForNotification();
-  return args.err;
-}
-
-class NetworkNamespaceTest
-    : public ::testing::TestWithParam<NamespaceStrategy> {};
-
-TEST_P(NetworkNamespaceTest, LoopbackExists) {
-  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)));
-
-  EXPECT_NO_ERRNO(GetParam().run([]() {
     // TODO(gvisor.dev/issue/1833): Update this to test that only "lo" exists.
     // Check loopback device exists.
     int sock = socket(AF_INET, SOCK_DGRAM, 0);
-    if (sock < 0) {
-      return PosixError(errno, "socket() failed");
-    }
+    ASSERT_THAT(sock, SyscallSucceeds());
     struct ifreq ifr;
-    snprintf(ifr.ifr_name, IFNAMSIZ, "lo");
-    if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0) {
-      return PosixError(errno, "ioctl() failed, lo cannot be found");
-    }
-    return NoError();
-  }));
+    strncpy(ifr.ifr_name, "lo", IFNAMSIZ);
+    EXPECT_THAT(ioctl(sock, SIOCGIFINDEX, &ifr), SyscallSucceeds())
+        << "lo cannot be found";
+  });
 }
 
-INSTANTIATE_TEST_SUITE_P(
-    AllNetworkNamespaceTest, NetworkNamespaceTest,
-    ::testing::Values(NamespaceStrategy::Of(RunWithUnshare),
-                      NamespaceStrategy::Of(RunWithClone)));
-
 }  // namespace
-
 }  // namespace testing
 }  // namespace gvisor
diff --git a/test/syscalls/linux/open_create.cc b/test/syscalls/linux/open_create.cc
index 902d0a0dc..51eacf3f2 100644
--- a/test/syscalls/linux/open_create.cc
+++ b/test/syscalls/linux/open_create.cc
@@ -19,11 +19,11 @@
 #include <unistd.h>
 
 #include "gtest/gtest.h"
-#include "test/syscalls/linux/temp_umask.h"
 #include "test/util/capability_util.h"
 #include "test/util/file_descriptor.h"
 #include "test/util/fs_util.h"
 #include "test/util/temp_path.h"
+#include "test/util/temp_umask.h"
 #include "test/util/test_util.h"
 
 namespace gvisor {
diff --git a/test/syscalls/linux/packet_socket.cc b/test/syscalls/linux/packet_socket.cc
index 92ae55eec..5ac68feb4 100644
--- a/test/syscalls/linux/packet_socket.cc
+++ b/test/syscalls/linux/packet_socket.cc
@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #include <arpa/inet.h>
+#include <ifaddrs.h>
 #include <linux/capability.h>
 #include <linux/if_arp.h>
 #include <linux/if_packet.h>
@@ -163,16 +164,11 @@ int CookedPacketTest::GetLoopbackIndex() {
   return ifr.ifr_ifindex;
 }
 
-// Receive via a packet socket.
-TEST_P(CookedPacketTest, Receive) {
-  // Let's use a simple IP payload: a UDP datagram.
-  FileDescriptor udp_sock =
-      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0));
-  SendUDPMessage(udp_sock.get());
-
+// Receive and verify the message via packet socket on interface.
+void ReceiveMessage(int sock, int ifindex) {
   // Wait for the socket to become readable.
   struct pollfd pfd = {};
-  pfd.fd = socket_;
+  pfd.fd = sock;
   pfd.events = POLLIN;
   EXPECT_THAT(RetryEINTR(poll)(&pfd, 1, 2000), SyscallSucceedsWithValue(1));
 
@@ -182,9 +178,10 @@ TEST_P(CookedPacketTest, Receive) {
   char buf[64];
   struct sockaddr_ll src = {};
   socklen_t src_len = sizeof(src);
-  ASSERT_THAT(recvfrom(socket_, buf, sizeof(buf), 0,
+  ASSERT_THAT(recvfrom(sock, buf, sizeof(buf), 0,
                        reinterpret_cast<struct sockaddr*>(&src), &src_len),
               SyscallSucceedsWithValue(packet_size));
+
   // sockaddr_ll ends with an 8 byte physical address field, but ethernet
   // addresses only use 6 bytes.  Linux used to return sizeof(sockaddr_ll)-2
   // here, but since commit b2cf86e1563e33a14a1c69b3e508d15dc12f804c returns
@@ -194,7 +191,7 @@ TEST_P(CookedPacketTest, Receive) {
   // TODO(b/129292371): Verify protocol once we return it.
   // Verify the source address.
   EXPECT_EQ(src.sll_family, AF_PACKET);
-  EXPECT_EQ(src.sll_ifindex, GetLoopbackIndex());
+  EXPECT_EQ(src.sll_ifindex, ifindex);
   EXPECT_EQ(src.sll_halen, ETH_ALEN);
   // This came from the loopback device, so the address is all 0s.
   for (int i = 0; i < src.sll_halen; i++) {
@@ -222,6 +219,18 @@ TEST_P(CookedPacketTest, Receive) {
   EXPECT_EQ(strncmp(payload, kMessage, sizeof(kMessage)), 0);
 }
 
+// Receive via a packet socket.
+TEST_P(CookedPacketTest, Receive) {
+  // Let's use a simple IP payload: a UDP datagram.
+  FileDescriptor udp_sock =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0));
+  SendUDPMessage(udp_sock.get());
+
+  // Receive and verify the data.
+  int loopback_index = GetLoopbackIndex();
+  ReceiveMessage(socket_, loopback_index);
+}
+
 // Send via a packet socket.
 TEST_P(CookedPacketTest, Send) {
   // TODO(b/129292371): Remove once we support packet socket writing.
@@ -313,6 +322,115 @@ TEST_P(CookedPacketTest, Send) {
   EXPECT_EQ(src.sin_addr.s_addr, htonl(INADDR_LOOPBACK));
 }
 
+// Bind and receive via packet socket.
+TEST_P(CookedPacketTest, BindReceive) {
+  struct sockaddr_ll bind_addr = {};
+  bind_addr.sll_family = AF_PACKET;
+  bind_addr.sll_protocol = htons(GetParam());
+  bind_addr.sll_ifindex = GetLoopbackIndex();
+
+  ASSERT_THAT(bind(socket_, reinterpret_cast<struct sockaddr*>(&bind_addr),
+                   sizeof(bind_addr)),
+              SyscallSucceeds());
+
+  // Let's use a simple IP payload: a UDP datagram.
+  FileDescriptor udp_sock =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0));
+  SendUDPMessage(udp_sock.get());
+
+  // Receive and verify the data.
+  ReceiveMessage(socket_, bind_addr.sll_ifindex);
+}
+
+// Double Bind socket.
+TEST_P(CookedPacketTest, DoubleBind) {
+  struct sockaddr_ll bind_addr = {};
+  bind_addr.sll_family = AF_PACKET;
+  bind_addr.sll_protocol = htons(GetParam());
+  bind_addr.sll_ifindex = GetLoopbackIndex();
+
+  ASSERT_THAT(bind(socket_, reinterpret_cast<struct sockaddr*>(&bind_addr),
+                   sizeof(bind_addr)),
+              SyscallSucceeds());
+
+  // Binding socket again should fail.
+  ASSERT_THAT(
+      bind(socket_, reinterpret_cast<struct sockaddr*>(&bind_addr),
+           sizeof(bind_addr)),
+      // Linux 4.09 returns EINVAL here, but some time before 4.19 it switched
+      // to EADDRINUSE.
+      AnyOf(SyscallFailsWithErrno(EADDRINUSE), SyscallFailsWithErrno(EINVAL)));
+}
+
+// Bind and verify we do not receive data on interface which is not bound
+TEST_P(CookedPacketTest, BindDrop) {
+  // Let's use a simple IP payload: a UDP datagram.
+  FileDescriptor udp_sock =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0));
+
+  struct ifaddrs* if_addr_list = nullptr;
+  auto cleanup = Cleanup([&if_addr_list]() { freeifaddrs(if_addr_list); });
+
+  ASSERT_THAT(getifaddrs(&if_addr_list), SyscallSucceeds());
+
+  // Get interface other than loopback.
+  struct ifreq ifr = {};
+  for (struct ifaddrs* i = if_addr_list; i; i = i->ifa_next) {
+    if (strcmp(i->ifa_name, "lo") != 0) {
+      strncpy(ifr.ifr_name, i->ifa_name, sizeof(ifr.ifr_name));
+      break;
+    }
+  }
+
+  // Skip if no interface is available other than loopback.
+  if (strlen(ifr.ifr_name) == 0) {
+    GTEST_SKIP();
+  }
+
+  // Get interface index.
+  EXPECT_THAT(ioctl(socket_, SIOCGIFINDEX, &ifr), SyscallSucceeds());
+  EXPECT_NE(ifr.ifr_ifindex, 0);
+
+  // Bind to packet socket requires only family, protocol and ifindex.
+  struct sockaddr_ll bind_addr = {};
+  bind_addr.sll_family = AF_PACKET;
+  bind_addr.sll_protocol = htons(GetParam());
+  bind_addr.sll_ifindex = ifr.ifr_ifindex;
+
+  ASSERT_THAT(bind(socket_, reinterpret_cast<struct sockaddr*>(&bind_addr),
+                   sizeof(bind_addr)),
+              SyscallSucceeds());
+
+  // Send to loopback interface.
+  struct sockaddr_in dest = {};
+  dest.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+  dest.sin_family = AF_INET;
+  dest.sin_port = kPort;
+  EXPECT_THAT(sendto(udp_sock.get(), kMessage, sizeof(kMessage), 0,
+                     reinterpret_cast<struct sockaddr*>(&dest), sizeof(dest)),
+              SyscallSucceedsWithValue(sizeof(kMessage)));
+
+  // Wait and make sure the socket never receives any data.
+  struct pollfd pfd = {};
+  pfd.fd = socket_;
+  pfd.events = POLLIN;
+  EXPECT_THAT(RetryEINTR(poll)(&pfd, 1, 1000), SyscallSucceedsWithValue(0));
+}
+
+// Bind with invalid address.
+TEST_P(CookedPacketTest, BindFail) {
+  // Null address.
+  ASSERT_THAT(
+      bind(socket_, nullptr, sizeof(struct sockaddr)),
+      AnyOf(SyscallFailsWithErrno(EFAULT), SyscallFailsWithErrno(EINVAL)));
+
+  // Address of size 1.
+  uint8_t addr = 0;
+  ASSERT_THAT(
+      bind(socket_, reinterpret_cast<struct sockaddr*>(&addr), sizeof(addr)),
+      SyscallFailsWithErrno(EINVAL));
+}
+
 INSTANTIATE_TEST_SUITE_P(AllInetTests, CookedPacketTest,
                          ::testing::Values(ETH_P_IP, ETH_P_ALL));
 
diff --git a/test/syscalls/linux/proc.cc b/test/syscalls/linux/proc.cc
index f91187e75..5a70f6c3b 100644
--- a/test/syscalls/linux/proc.cc
+++ b/test/syscalls/linux/proc.cc
@@ -1431,6 +1431,12 @@ TEST(ProcPidFile, SubprocessRunning) {
 
   EXPECT_THAT(ReadWhileRunning("uid_map", buf, sizeof(buf)),
               SyscallSucceedsWithValue(sizeof(buf)));
+
+  EXPECT_THAT(ReadWhileRunning("oom_score", buf, sizeof(buf)),
+              SyscallSucceedsWithValue(sizeof(buf)));
+
+  EXPECT_THAT(ReadWhileRunning("oom_score_adj", buf, sizeof(buf)),
+              SyscallSucceedsWithValue(sizeof(buf)));
 }
 
 // Test whether /proc/PID/ files can be read for a zombie process.
@@ -1466,6 +1472,12 @@ TEST(ProcPidFile, SubprocessZombie) {
   EXPECT_THAT(ReadWhileZombied("uid_map", buf, sizeof(buf)),
               SyscallSucceedsWithValue(sizeof(buf)));
 
+  EXPECT_THAT(ReadWhileZombied("oom_score", buf, sizeof(buf)),
+              SyscallSucceedsWithValue(sizeof(buf)));
+
+  EXPECT_THAT(ReadWhileZombied("oom_score_adj", buf, sizeof(buf)),
+              SyscallSucceedsWithValue(sizeof(buf)));
+
   // FIXME(gvisor.dev/issue/164): Inconsistent behavior between gVisor and linux
   // on proc files.
   //
@@ -1527,6 +1539,15 @@ TEST(ProcPidFile, SubprocessExited) {
 
   EXPECT_THAT(ReadWhileExited("uid_map", buf, sizeof(buf)),
               SyscallSucceedsWithValue(sizeof(buf)));
+
+  if (!IsRunningOnGvisor()) {
+    // FIXME(gvisor.dev/issue/164): Succeeds on gVisor.
+    EXPECT_THAT(ReadWhileExited("oom_score", buf, sizeof(buf)),
+                SyscallFailsWithErrno(ESRCH));
+  }
+
+  EXPECT_THAT(ReadWhileExited("oom_score_adj", buf, sizeof(buf)),
+              SyscallFailsWithErrno(ESRCH));
 }
 
 PosixError DirContainsImpl(absl::string_view path,
diff --git a/test/syscalls/linux/proc_net.cc b/test/syscalls/linux/proc_net.cc
index 3a611a86f..05c952b99 100644
--- a/test/syscalls/linux/proc_net.cc
+++ b/test/syscalls/linux/proc_net.cc
@@ -33,6 +33,31 @@ namespace gvisor {
 namespace testing {
 namespace {
 
+constexpr const char kProcNet[] = "/proc/net";
+
+TEST(ProcNetSymlinkTarget, FileMode) {
+  struct stat s;
+  ASSERT_THAT(stat(kProcNet, &s), SyscallSucceeds());
+  EXPECT_EQ(s.st_mode & S_IFMT, S_IFDIR);
+  EXPECT_EQ(s.st_mode & 0777, 0555);
+}
+
+TEST(ProcNetSymlink, FileMode) {
+  struct stat s;
+  ASSERT_THAT(lstat(kProcNet, &s), SyscallSucceeds());
+  EXPECT_EQ(s.st_mode & S_IFMT, S_IFLNK);
+  EXPECT_EQ(s.st_mode & 0777, 0777);
+}
+
+TEST(ProcNetSymlink, Contents) {
+  char buf[40] = {};
+  int n = readlink(kProcNet, buf, sizeof(buf));
+  ASSERT_THAT(n, SyscallSucceeds());
+
+  buf[n] = 0;
+  EXPECT_STREQ(buf, "self/net");
+}
+
 TEST(ProcNetIfInet6, Format) {
   auto ifinet6 = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/if_inet6"));
   EXPECT_THAT(ifinet6,
diff --git a/test/syscalls/linux/proc_pid_oomscore.cc b/test/syscalls/linux/proc_pid_oomscore.cc
new file mode 100644
index 000000000..707821a3f
--- /dev/null
+++ b/test/syscalls/linux/proc_pid_oomscore.cc
@@ -0,0 +1,72 @@
+// Copyright 2020 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <errno.h>
+
+#include <exception>
+#include <iostream>
+#include <string>
+
+#include "test/util/fs_util.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+PosixErrorOr<int> ReadProcNumber(std::string path) {
+  ASSIGN_OR_RETURN_ERRNO(std::string contents, GetContents(path));
+  EXPECT_EQ(contents[contents.length() - 1], '\n');
+
+  int num;
+  if (!absl::SimpleAtoi(contents, &num)) {
+    return PosixError(EINVAL, "invalid value: " + contents);
+  }
+
+  return num;
+}
+
+TEST(ProcPidOomscoreTest, BasicRead) {
+  auto const oom_score =
+      ASSERT_NO_ERRNO_AND_VALUE(ReadProcNumber("/proc/self/oom_score"));
+  EXPECT_LE(oom_score, 1000);
+  EXPECT_GE(oom_score, -1000);
+}
+
+TEST(ProcPidOomscoreAdjTest, BasicRead) {
+  auto const oom_score =
+      ASSERT_NO_ERRNO_AND_VALUE(ReadProcNumber("/proc/self/oom_score_adj"));
+
+  // oom_score_adj defaults to 0.
+  EXPECT_EQ(oom_score, 0);
+}
+
+TEST(ProcPidOomscoreAdjTest, BasicWrite) {
+  constexpr int test_value = 7;
+  FileDescriptor fd =
+      ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/self/oom_score_adj", O_WRONLY));
+  ASSERT_THAT(
+      RetryEINTR(write)(fd.get(), std::to_string(test_value).c_str(), 1),
+      SyscallSucceeds());
+
+  auto const oom_score =
+      ASSERT_NO_ERRNO_AND_VALUE(ReadProcNumber("/proc/self/oom_score_adj"));
+  EXPECT_EQ(oom_score, test_value);
+}
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor
diff --git a/test/syscalls/linux/rseq/uapi.h b/test/syscalls/linux/rseq/uapi.h
index e3ff0579a..ca1d67691 100644
--- a/test/syscalls/linux/rseq/uapi.h
+++ b/test/syscalls/linux/rseq/uapi.h
@@ -15,14 +15,9 @@
 #ifndef GVISOR_TEST_SYSCALLS_LINUX_RSEQ_UAPI_H_
 #define GVISOR_TEST_SYSCALLS_LINUX_RSEQ_UAPI_H_
 
-// User-kernel ABI for restartable sequences.
+#include <stdint.h>
 
-// Standard types.
-//
-// N.B. This header will be included in targets that do have the standard
-// library, so we can't shadow the standard type names.
-using __u32 = __UINT32_TYPE__;
-using __u64 = __UINT64_TYPE__;
+// User-kernel ABI for restartable sequences.
 
 #ifdef __x86_64__
 // Syscall numbers.
@@ -32,20 +27,20 @@ constexpr int kRseqSyscall = 334;
 #endif  // __x86_64__
 
 struct rseq_cs {
-  __u32 version;
-  __u32 flags;
-  __u64 start_ip;
-  __u64 post_commit_offset;
-  __u64 abort_ip;
-} __attribute__((aligned(4 * sizeof(__u64))));
+  uint32_t version;
+  uint32_t flags;
+  uint64_t start_ip;
+  uint64_t post_commit_offset;
+  uint64_t abort_ip;
+} __attribute__((aligned(4 * sizeof(uint64_t))));
 
 // N.B. alignment is enforced by the kernel.
 struct rseq {
-  __u32 cpu_id_start;
-  __u32 cpu_id;
+  uint32_t cpu_id_start;
+  uint32_t cpu_id;
   struct rseq_cs* rseq_cs;
-  __u32 flags;
-} __attribute__((aligned(4 * sizeof(__u64))));
+  uint32_t flags;
+} __attribute__((aligned(4 * sizeof(uint64_t))));
 
 constexpr int kRseqFlagUnregister = 1 << 0;
 
diff --git a/test/syscalls/linux/seccomp.cc b/test/syscalls/linux/seccomp.cc
index cf6499f8b..8e0fc9acc 100644
--- a/test/syscalls/linux/seccomp.cc
+++ b/test/syscalls/linux/seccomp.cc
@@ -53,7 +53,7 @@ namespace {
 constexpr uint32_t kFilteredSyscall = SYS_vserver;
 #elif __aarch64__
 // Use the last of arch_specific_syscalls which are not implemented on arm64.
-constexpr uint32_t kFilteredSyscall = SYS_arch_specific_syscall + 15;
+constexpr uint32_t kFilteredSyscall = __NR_arch_specific_syscall + 15;
 #endif
 
 // Applies a seccomp-bpf filter that returns `filtered_result` for
diff --git a/test/syscalls/linux/socket_generic.cc b/test/syscalls/linux/socket_generic.cc
index e8f24a59e..f7d6139f1 100644
--- a/test/syscalls/linux/socket_generic.cc
+++ b/test/syscalls/linux/socket_generic.cc
@@ -447,6 +447,60 @@ TEST_P(AllSocketPairTest, RecvTimeoutRecvmsgSucceeds) {
               SyscallFailsWithErrno(EAGAIN));
 }
 
+TEST_P(AllSocketPairTest, SendTimeoutDefault) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+
+  timeval actual_tv = {.tv_sec = -1, .tv_usec = -1};
+  socklen_t len = sizeof(actual_tv);
+  EXPECT_THAT(getsockopt(sockets->first_fd(), SOL_SOCKET, SO_SNDTIMEO,
+                         &actual_tv, &len),
+              SyscallSucceeds());
+  EXPECT_EQ(actual_tv.tv_sec, 0);
+  EXPECT_EQ(actual_tv.tv_usec, 0);
+}
+
+TEST_P(AllSocketPairTest, SetGetSendTimeout) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+
+  timeval tv = {.tv_sec = 89, .tv_usec = 42000};
+  EXPECT_THAT(
+      setsockopt(sockets->first_fd(), SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)),
+      SyscallSucceeds());
+
+  timeval actual_tv = {};
+  socklen_t len = sizeof(actual_tv);
+  EXPECT_THAT(getsockopt(sockets->first_fd(), SOL_SOCKET, SO_SNDTIMEO,
+                         &actual_tv, &len),
+              SyscallSucceeds());
+  EXPECT_EQ(actual_tv.tv_sec, 89);
+  EXPECT_EQ(actual_tv.tv_usec, 42000);
+}
+
+TEST_P(AllSocketPairTest, SetGetSendTimeoutLargerArg) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+
+  struct timeval_with_extra {
+    struct timeval tv;
+    int64_t extra_data;
+  } ABSL_ATTRIBUTE_PACKED;
+
+  timeval_with_extra tv_extra = {
+      .tv = {.tv_sec = 0, .tv_usec = 123000},
+  };
+
+  EXPECT_THAT(setsockopt(sockets->first_fd(), SOL_SOCKET, SO_SNDTIMEO,
+                         &tv_extra, sizeof(tv_extra)),
+              SyscallSucceeds());
+
+  timeval_with_extra actual_tv = {};
+  socklen_t len = sizeof(actual_tv);
+  EXPECT_THAT(getsockopt(sockets->first_fd(), SOL_SOCKET, SO_SNDTIMEO,
+                         &actual_tv, &len),
+              SyscallSucceeds());
+  EXPECT_EQ(actual_tv.tv.tv_sec, 0);
+  EXPECT_EQ(actual_tv.tv.tv_usec, 123000);
+}
+
 TEST_P(AllSocketPairTest, SendTimeoutAllowsWrite) {
   auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
 
@@ -491,18 +545,36 @@ TEST_P(AllSocketPairTest, SendTimeoutAllowsSendmsg) {
   ASSERT_NO_FATAL_FAILURE(SendNullCmsg(sockets->first_fd(), buf, sizeof(buf)));
 }
 
-TEST_P(AllSocketPairTest, SoRcvTimeoIsSet) {
+TEST_P(AllSocketPairTest, RecvTimeoutDefault) {
   auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
 
-  struct timeval tv {
-    .tv_sec = 0, .tv_usec = 35
-  };
+  timeval actual_tv = {.tv_sec = -1, .tv_usec = -1};
+  socklen_t len = sizeof(actual_tv);
+  EXPECT_THAT(getsockopt(sockets->first_fd(), SOL_SOCKET, SO_RCVTIMEO,
+                         &actual_tv, &len),
+              SyscallSucceeds());
+  EXPECT_EQ(actual_tv.tv_sec, 0);
+  EXPECT_EQ(actual_tv.tv_usec, 0);
+}
+
+TEST_P(AllSocketPairTest, SetGetRecvTimeout) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+
+  timeval tv = {.tv_sec = 123, .tv_usec = 456000};
   EXPECT_THAT(
       setsockopt(sockets->first_fd(), SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)),
       SyscallSucceeds());
+
+  timeval actual_tv = {};
+  socklen_t len = sizeof(actual_tv);
+  EXPECT_THAT(getsockopt(sockets->first_fd(), SOL_SOCKET, SO_RCVTIMEO,
+                         &actual_tv, &len),
+              SyscallSucceeds());
+  EXPECT_EQ(actual_tv.tv_sec, 123);
+  EXPECT_EQ(actual_tv.tv_usec, 456000);
 }
 
-TEST_P(AllSocketPairTest, SoRcvTimeoIsSetLargerArg) {
+TEST_P(AllSocketPairTest, SetGetRecvTimeoutLargerArg) {
   auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
 
   struct timeval_with_extra {
@@ -510,13 +582,21 @@ TEST_P(AllSocketPairTest, SoRcvTimeoIsSetLargerArg) {
     int64_t extra_data;
   } ABSL_ATTRIBUTE_PACKED;
 
-  timeval_with_extra tv_extra;
-  tv_extra.tv.tv_sec = 0;
-  tv_extra.tv.tv_usec = 25;
+  timeval_with_extra tv_extra = {
+      .tv = {.tv_sec = 0, .tv_usec = 432000},
+  };
 
   EXPECT_THAT(setsockopt(sockets->first_fd(), SOL_SOCKET, SO_RCVTIMEO,
                          &tv_extra, sizeof(tv_extra)),
               SyscallSucceeds());
+
+  timeval_with_extra actual_tv = {};
+  socklen_t len = sizeof(actual_tv);
+  EXPECT_THAT(getsockopt(sockets->first_fd(), SOL_SOCKET, SO_RCVTIMEO,
+                         &actual_tv, &len),
+              SyscallSucceeds());
+  EXPECT_EQ(actual_tv.tv.tv_sec, 0);
+  EXPECT_EQ(actual_tv.tv.tv_usec, 432000);
 }
 
 TEST_P(AllSocketPairTest, RecvTimeoutRecvmsgOneSecondSucceeds) {
diff --git a/test/syscalls/linux/stat.cc b/test/syscalls/linux/stat.cc
index c951ac3b3..513b9cd1c 100644
--- a/test/syscalls/linux/stat.cc
+++ b/test/syscalls/linux/stat.cc
@@ -607,7 +607,7 @@ int statx(int dirfd, const char* pathname, int flags, unsigned int mask,
 }
 
 TEST_F(StatTest, StatxAbsPath) {
-  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, 0) < 0 &&
+  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, nullptr) < 0 &&
           errno == ENOSYS);
 
   struct kernel_statx stx;
@@ -617,7 +617,7 @@ TEST_F(StatTest, StatxAbsPath) {
 }
 
 TEST_F(StatTest, StatxRelPathDirFD) {
-  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, 0) < 0 &&
+  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, nullptr) < 0 &&
           errno == ENOSYS);
 
   struct kernel_statx stx;
@@ -631,7 +631,7 @@ TEST_F(StatTest, StatxRelPathDirFD) {
 }
 
 TEST_F(StatTest, StatxRelPathCwd) {
-  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, 0) < 0 &&
+  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, nullptr) < 0 &&
           errno == ENOSYS);
 
   ASSERT_THAT(chdir(GetAbsoluteTestTmpdir().c_str()), SyscallSucceeds());
@@ -643,7 +643,7 @@ TEST_F(StatTest, StatxRelPathCwd) {
 }
 
 TEST_F(StatTest, StatxEmptyPath) {
-  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, 0) < 0 &&
+  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, nullptr) < 0 &&
           errno == ENOSYS);
 
   const auto fd = ASSERT_NO_ERRNO_AND_VALUE(Open(test_file_name_, O_RDONLY));
@@ -653,6 +653,58 @@ TEST_F(StatTest, StatxEmptyPath) {
   EXPECT_TRUE(S_ISREG(stx.stx_mode));
 }
 
+TEST_F(StatTest, StatxDoesNotRejectExtraneousMaskBits) {
+  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, nullptr) < 0 &&
+          errno == ENOSYS);
+
+  struct kernel_statx stx;
+  // Set all mask bits except for STATX__RESERVED.
+  uint mask = 0xffffffff & ~0x80000000;
+  EXPECT_THAT(statx(-1, test_file_name_.c_str(), 0, mask, &stx),
+              SyscallSucceeds());
+  EXPECT_TRUE(S_ISREG(stx.stx_mode));
+}
+
+TEST_F(StatTest, StatxRejectsReservedMaskBit) {
+  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, nullptr) < 0 &&
+          errno == ENOSYS);
+
+  struct kernel_statx stx;
+  // Set STATX__RESERVED in the mask.
+  EXPECT_THAT(statx(-1, test_file_name_.c_str(), 0, 0x80000000, &stx),
+              SyscallFailsWithErrno(EINVAL));
+}
+
+TEST_F(StatTest, StatxSymlink) {
+  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, nullptr) < 0 &&
+          errno == ENOSYS);
+
+  std::string parent_dir = "/tmp";
+  TempPath link = ASSERT_NO_ERRNO_AND_VALUE(
+      TempPath::CreateSymlinkTo(parent_dir, test_file_name_));
+  std::string p = link.path();
+
+  struct kernel_statx stx;
+  EXPECT_THAT(statx(AT_FDCWD, p.c_str(), AT_SYMLINK_NOFOLLOW, STATX_ALL, &stx),
+              SyscallSucceeds());
+  EXPECT_TRUE(S_ISLNK(stx.stx_mode));
+  EXPECT_THAT(statx(AT_FDCWD, p.c_str(), 0, STATX_ALL, &stx),
+              SyscallSucceeds());
+  EXPECT_TRUE(S_ISREG(stx.stx_mode));
+}
+
+TEST_F(StatTest, StatxInvalidFlags) {
+  SKIP_IF(!IsRunningOnGvisor() && statx(-1, nullptr, 0, 0, nullptr) < 0 &&
+          errno == ENOSYS);
+
+  struct kernel_statx stx;
+  EXPECT_THAT(statx(AT_FDCWD, test_file_name_.c_str(), 12345, 0, &stx),
+              SyscallFailsWithErrno(EINVAL));
+  EXPECT_THAT(statx(AT_FDCWD, test_file_name_.c_str(),
+                    0x6000 /* AT_STATX_SYNC_TYPE */, 0, &stx),
+              SyscallFailsWithErrno(EINVAL));
+}
+
 }  // namespace
 
 }  // namespace testing
diff --git a/test/syscalls/linux/tcp_socket.cc b/test/syscalls/linux/tcp_socket.cc
index c4591a3b9..d9c1ac0e1 100644
--- a/test/syscalls/linux/tcp_socket.cc
+++ b/test/syscalls/linux/tcp_socket.cc
@@ -143,6 +143,20 @@ TEST_P(TcpSocketTest, ConnectOnEstablishedConnection) {
       SyscallFailsWithErrno(EISCONN));
 }
 
+TEST_P(TcpSocketTest, ShutdownWriteInTimeWait) {
+  EXPECT_THAT(shutdown(t_, SHUT_WR), SyscallSucceeds());
+  EXPECT_THAT(shutdown(s_, SHUT_RDWR), SyscallSucceeds());
+  absl::SleepFor(absl::Seconds(1));  // Wait to enter TIME_WAIT.
+  EXPECT_THAT(shutdown(t_, SHUT_WR), SyscallFailsWithErrno(ENOTCONN));
+}
+
+TEST_P(TcpSocketTest, ShutdownWriteInFinWait1) {
+  EXPECT_THAT(shutdown(t_, SHUT_WR), SyscallSucceeds());
+  EXPECT_THAT(shutdown(t_, SHUT_WR), SyscallSucceeds());
+  absl::SleepFor(absl::Seconds(1));  // Wait to enter FIN-WAIT2.
+  EXPECT_THAT(shutdown(t_, SHUT_WR), SyscallSucceeds());
+}
+
 TEST_P(TcpSocketTest, DataCoalesced) {
   char buf[10];
 
@@ -1349,6 +1363,21 @@ TEST_P(SimpleTcpSocketTest, RecvOnClosedSocket) {
               SyscallFailsWithErrno(ENOTCONN));
 }
 
+TEST_P(SimpleTcpSocketTest, TCPConnectSoRcvBufRace) {
+  auto s = ASSERT_NO_ERRNO_AND_VALUE(
+      Socket(GetParam(), SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP));
+  sockaddr_storage addr =
+      ASSERT_NO_ERRNO_AND_VALUE(InetLoopbackAddr(GetParam()));
+  socklen_t addrlen = sizeof(addr);
+
+  RetryEINTR(connect)(s.get(), reinterpret_cast<struct sockaddr*>(&addr),
+                      addrlen);
+  int buf_sz = 1 << 18;
+  EXPECT_THAT(
+      setsockopt(s.get(), SOL_SOCKET, SO_RCVBUF, &buf_sz, sizeof(buf_sz)),
+      SyscallSucceedsWithValue(0));
+}
+
 INSTANTIATE_TEST_SUITE_P(AllInetTests, SimpleTcpSocketTest,
                          ::testing::Values(AF_INET, AF_INET6));
 
diff --git a/test/syscalls/linux/time.cc b/test/syscalls/linux/time.cc
index 1ccb95733..e75bba669 100644
--- a/test/syscalls/linux/time.cc
+++ b/test/syscalls/linux/time.cc
@@ -26,6 +26,7 @@ namespace {
 
 constexpr long kFudgeSeconds = 5;
 
+#if defined(__x86_64__) || defined(__i386__)
 // Mimics the time(2) wrapper from glibc prior to 2.15.
 time_t vsyscall_time(time_t* t) {
   constexpr uint64_t kVsyscallTimeEntry = 0xffffffffff600400;
@@ -98,6 +99,7 @@ TEST(TimeTest, VsyscallGettimeofday_InvalidAddressSIGSEGV) {
                                     reinterpret_cast<struct timezone*>(0x1)),
               ::testing::KilledBySignal(SIGSEGV), "");
 }
+#endif
 
 }  // namespace
 
diff --git a/test/syscalls/linux/tuntap.cc b/test/syscalls/linux/tuntap.cc
index f6ac9d7b8..f734511d6 100644
--- a/test/syscalls/linux/tuntap.cc
+++ b/test/syscalls/linux/tuntap.cc
@@ -153,6 +153,13 @@ std::string CreateArpPacket(const uint8_t srcmac[ETH_ALEN], const char* srcip,
 
 }  // namespace
 
+TEST(TuntapStaticTest, NetTunExists) {
+  struct stat statbuf;
+  ASSERT_THAT(stat(kDevNetTun, &statbuf), SyscallSucceeds());
+  // Check that it's a character device with rw-rw-rw- permissions.
+  EXPECT_EQ(statbuf.st_mode, S_IFCHR | 0666);
+}
+
 class TuntapTest : public ::testing::Test {
  protected:
   void TearDown() override {
diff --git a/test/syscalls/linux/temp_umask.h b/test/syscalls/linux/tuntap_hostinet.cc
index 81a25440c..1513fb9d5 100644
--- a/test/syscalls/linux/temp_umask.h
+++ b/test/syscalls/linux/tuntap_hostinet.cc
@@ -1,4 +1,4 @@
-// Copyright 2018 The gVisor Authors.
+// Copyright 2020 The gVisor Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,28 +12,27 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef GVISOR_TEST_SYSCALLS_TEMP_UMASK_H_
-#define GVISOR_TEST_SYSCALLS_TEMP_UMASK_H_
-
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <unistd.h>
+
+#include "gtest/gtest.h"
+#include "test/util/test_util.h"
 
 namespace gvisor {
 namespace testing {
 
-class TempUmask {
- public:
-  // Sets the process umask to `mask`.
-  explicit TempUmask(mode_t mask) : old_mask_(umask(mask)) {}
+namespace {
 
-  // Sets the process umask to its previous value.
-  ~TempUmask() { umask(old_mask_); }
+TEST(TuntapHostInetTest, NoNetTun) {
+  SKIP_IF(!IsRunningOnGvisor());
+  SKIP_IF(!IsRunningWithHostinet());
 
- private:
-  mode_t old_mask_;
-};
+  struct stat statbuf;
+  ASSERT_THAT(stat("/dev/net/tun", &statbuf), SyscallFailsWithErrno(ENOENT));
+}
 
+}  // namespace
 }  // namespace testing
-}  // namespace gvisor
 
-#endif  // GVISOR_TEST_SYSCALLS_TEMP_UMASK_H_
+}  // namespace gvisor
diff --git a/test/syscalls/linux/udp_socket_test_cases.cc b/test/syscalls/linux/udp_socket_test_cases.cc
index 57b1a357c..740c7986d 100644
--- a/test/syscalls/linux/udp_socket_test_cases.cc
+++ b/test/syscalls/linux/udp_socket_test_cases.cc
@@ -21,6 +21,10 @@
 #include <sys/socket.h>
 #include <sys/types.h>
 
+#ifndef SIOCGSTAMP
+#include <linux/sockios.h>
+#endif
+
 #include "gtest/gtest.h"
 #include "absl/base/macros.h"
 #include "absl/time/clock.h"
diff --git a/test/syscalls/linux/vsyscall.cc b/test/syscalls/linux/vsyscall.cc
index 2c2303358..ae4377108 100644
--- a/test/syscalls/linux/vsyscall.cc
+++ b/test/syscalls/linux/vsyscall.cc
@@ -24,6 +24,7 @@ namespace testing {
 
 namespace {
 
+#if defined(__x86_64__) || defined(__i386__)
 time_t vsyscall_time(time_t* t) {
   constexpr uint64_t kVsyscallTimeEntry = 0xffffffffff600400;
   return reinterpret_cast<time_t (*)(time_t*)>(kVsyscallTimeEntry)(t);
@@ -37,6 +38,7 @@ TEST(VsyscallTest, VsyscallAlwaysAvailableOnGvisor) {
   time_t t;
   EXPECT_THAT(vsyscall_time(&t), SyscallSucceeds());
 }
+#endif
 
 }  // namespace