Fix tests which fail in kokoro

* open_create_test_runsc_ptrace_shared doesn't expect the write access to /
* exec_test_runsc_ptrace_shared could not find /usr/share/zoneinfo/
* clock_gettime_test_runsc_ptrace_shared didn't expect that
  a thread cpu time can be zero.
* affinity_test_runsc_ptrace_shared expected minimum 3 cpus

PiperOrigin-RevId: 237509429
Change-Id: I477937e5d2cdf3f8720836bfa972abd35d8220a3

kokoro/run_tests.sh

@@ -177,16 +177,10 @@ run_root_tests() {
 # Run syscall unit tests.
 run_syscall_tests() {
   cd ${WORKSPACE_DIR}
-  # TODO: Exclude tests which fail.
   bazel \
     "${BAZEL_RBE_FLAGS[@]}" \
     test "${BAZEL_BUILD_RBE_FLAGS[@]}" \
-    `bazel query //test/syscalls/... |
-      grep runsc_ptrace |
-      grep -v affinity_test_runsc_ptrace |
-      grep -v exec_test_runsc_ptrace |
-      grep -v open_create_test_runsc_ptrace |
-      grep -v clock_gettime_test_runsc_ptrace`
+    --test_tag_filters=runsc_ptrace //test/syscalls/...
 }
 
 # Find and rename all test xml and log files so that Sponge can pick them up.

test/BUILD

@@ -34,10 +34,6 @@ platform(
           name: "dockerPrivileged"
           value: "true"
         }
-        properties: {
-          name: "dockerRunAsRoot"
-          value: "true"
-        }
     """,
 )
 

test/syscalls/BUILD

@@ -49,7 +49,10 @@ syscall_test(test = "//test/syscalls/linux:chroot_test")
 
 syscall_test(test = "//test/syscalls/linux:clock_getres_test")
 
-syscall_test(test = "//test/syscalls/linux:clock_gettime_test")
+syscall_test(
+    size = "medium",
+    test = "//test/syscalls/linux:clock_gettime_test",
+)
 
 syscall_test(test = "//test/syscalls/linux:clock_nanosleep_test")
 

test/syscalls/linux/affinity.cc

@@ -155,6 +155,7 @@ TEST_F(AffinityTest, Sanity) {
 }
 
 TEST_F(AffinityTest, NewThread) {
+  SKIP_IF(CPU_COUNT(&mask_) < 3);
   ASSERT_NO_ERRNO(ClearLowestBit());
   ASSERT_NO_ERRNO(ClearLowestBit());
   EXPECT_THAT(sched_setaffinity(/*pid=*/0, sizeof(cpu_set_t), &mask_),

test/syscalls/linux/clock_gettime.cc

@@ -87,7 +87,12 @@ TEST(ClockGettime, JavaThreadTime) {
   ASSERT_EQ(0, pthread_getcpuclockid(pthread_self(), &clockid));
   struct timespec tp;
   ASSERT_THAT(clock_getres(clockid, &tp), SyscallSucceeds());
-  ASSERT_THAT(clock_gettime(clockid, &tp), SyscallSucceeds());
+  EXPECT_TRUE(tp.tv_sec > 0 || tp.tv_nsec > 0);
+  // A thread cputime is updated each 10msec and there is no approximation
+  // if a task is running.
+  do {
+    ASSERT_THAT(clock_gettime(clockid, &tp), SyscallSucceeds());
+  } while (tp.tv_sec == 0 && tp.tv_nsec == 0);
   EXPECT_TRUE(tp.tv_sec > 0 || tp.tv_nsec > 0);
 }
 

test/syscalls/linux/exec.cc

@@ -476,8 +476,10 @@ TEST(ProcSelfExe, ChangesAcrossExecve) {
 }
 
 TEST(ExecTest, CloexecNormalFile) {
-  const FileDescriptor fd_closed_on_exec = ASSERT_NO_ERRNO_AND_VALUE(
-      Open("/usr/share/zoneinfo", O_RDONLY | O_CLOEXEC));
+  TempPath tempFile = ASSERT_NO_ERRNO_AND_VALUE(
+      TempPath::CreateFileWith(GetAbsoluteTestTmpdir(), "bar", 0755));
+  const FileDescriptor fd_closed_on_exec =
+      ASSERT_NO_ERRNO_AND_VALUE(Open(tempFile.path(), O_RDONLY | O_CLOEXEC));
 
   CheckOutput(WorkloadPath(kAssertClosedWorkload),
               {WorkloadPath(kAssertClosedWorkload),
@@ -487,7 +489,7 @@ TEST(ExecTest, CloexecNormalFile) {
   // The assert closed workload exits with code 2 if the file still exists.  We
   // can use this to do a negative test.
   const FileDescriptor fd_open_on_exec =
-      ASSERT_NO_ERRNO_AND_VALUE(Open("/usr/share/zoneinfo", O_RDONLY));
+      ASSERT_NO_ERRNO_AND_VALUE(Open(tempFile.path(), O_RDONLY));
 
   CheckOutput(WorkloadPath(kAssertClosedWorkload),
               {WorkloadPath(kAssertClosedWorkload),