Open source system call tests.

PiperOrigin-RevId: 224886231
Change-Id: I0fccb4d994601739d8b16b1d4e6b31f40297fb22

1 files changed, 103 insertions, 0 deletions

diff --git a/test/syscalls/linux/time.cc b/test/syscalls/linux/time.cc
new file mode 100644
index 000000000..3abcd8098
--- /dev/null
+++ b/test/syscalls/linux/time.cc
@@ -0,0 +1,103 @@
+// Copyright 2018 Google LLC
+//
+// 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 <time.h>
+
+#include "gtest/gtest.h"
+#include "test/util/proc_util.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+constexpr long kFudgeSeconds = 5;
+
+// Mimics the time(2) wrapper from glibc prior to 2.15.
+time_t vsyscall_time(time_t* t) {
+  constexpr uint64_t kVsyscallTimeEntry = 0xffffffffff600400;
+  return reinterpret_cast<time_t (*)(time_t*)>(kVsyscallTimeEntry)(t);
+}
+
+TEST(TimeTest, VsyscallTime_Succeeds) {
+  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(IsVsyscallEnabled()));
+
+  time_t t1, t2;
+
+  {
+    const DisableSave ds;  // Timing assertions.
+    EXPECT_THAT(time(&t1), SyscallSucceeds());
+    EXPECT_THAT(vsyscall_time(&t2), SyscallSucceeds());
+  }
+
+  // Time should be monotonic.
+  EXPECT_LE(static_cast<long>(t1), static_cast<long>(t2));
+
+  // Check that it's within kFudge seconds.
+  EXPECT_LE(static_cast<long>(t2), static_cast<long>(t1) + kFudgeSeconds);
+
+  // Redo with save.
+  EXPECT_THAT(time(&t1), SyscallSucceeds());
+  EXPECT_THAT(vsyscall_time(&t2), SyscallSucceeds());
+
+  // Time should be monotonic.
+  EXPECT_LE(static_cast<long>(t1), static_cast<long>(t2));
+}
+
+TEST(TimeTest, VsyscallTime_InvalidAddressSIGSEGV) {
+  EXPECT_EXIT(vsyscall_time(reinterpret_cast<time_t*>(0x1)),
+              ::testing::KilledBySignal(SIGSEGV), "");
+}
+int vsyscall_gettimeofday(struct timeval* tv, struct timezone* tz) {
+  constexpr uint64_t kVsyscallGettimeofdayEntry = 0xffffffffff600000;
+  return reinterpret_cast<int (*)(struct timeval*, struct timezone*)>(
+      kVsyscallGettimeofdayEntry)(tv, tz);
+}
+
+TEST(TimeTest, VsyscallGettimeofday_Succeeds) {
+  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(IsVsyscallEnabled()));
+
+  struct timeval tv1, tv2;
+  struct timezone tz1, tz2;
+
+  {
+    const DisableSave ds;  // Timing assertions.
+    EXPECT_THAT(gettimeofday(&tv1, &tz1), SyscallSucceeds());
+    EXPECT_THAT(vsyscall_gettimeofday(&tv2, &tz2), SyscallSucceeds());
+  }
+
+  // See above.
+  EXPECT_LE(static_cast<long>(tv1.tv_sec), static_cast<long>(tv2.tv_sec));
+  EXPECT_LE(static_cast<long>(tv2.tv_sec),
+            static_cast<long>(tv1.tv_sec) + kFudgeSeconds);
+
+  // Redo with save.
+  EXPECT_THAT(gettimeofday(&tv1, &tz1), SyscallSucceeds());
+  EXPECT_THAT(vsyscall_gettimeofday(&tv2, &tz2), SyscallSucceeds());
+}
+
+TEST(TimeTest, VsyscallGettimeofday_InvalidAddressSIGSEGV) {
+  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(IsVsyscallEnabled()));
+
+  EXPECT_EXIT(vsyscall_gettimeofday(reinterpret_cast<struct timeval*>(0x1),
+                                    reinterpret_cast<struct timezone*>(0x1)),
+              ::testing::KilledBySignal(SIGSEGV), "");
+}
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor