1 files changed, 78 insertions, 0 deletions
diff --git a/test/syscalls/linux/proc_defaults.cc b/test/syscalls/linux/proc_defaults.cc
new file mode 100644
index 000000000..9b9a85efc
--- /dev/null
+++ b/test/syscalls/linux/proc_defaults.cc
@@ -0,0 +1,78 @@
+// Copyright 2021 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 <linux/sem.h>
+#include <linux/shm.h>
+
+#include "absl/strings/numbers.h"
+#include "absl/strings/str_split.h"
+#include "gtest/gtest.h"
+#include "test/util/fs_util.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+namespace {
+
+TEST(ProcDefaults, PresenceOfShmMaxMniAll) {
+  uint64_t shmmax = 0;
+  uint64_t shmall = 0;
+  uint64_t shmmni = 0;
+  std::string proc_file;
+  proc_file = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/sys/kernel/shmmax"));
+  ASSERT_FALSE(proc_file.empty());
+  ASSERT_TRUE(absl::SimpleAtoi(proc_file, &shmmax));
+  proc_file = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/sys/kernel/shmall"));
+  ASSERT_FALSE(proc_file.empty());
+  ASSERT_TRUE(absl::SimpleAtoi(proc_file, &shmall));
+  proc_file = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/sys/kernel/shmmni"));
+  ASSERT_FALSE(proc_file.empty());
+  ASSERT_TRUE(absl::SimpleAtoi(proc_file, &shmmni));
+
+  ASSERT_EQ(shmmax, SHMMAX);
+  ASSERT_EQ(shmall, SHMALL);
+  ASSERT_EQ(shmmni, SHMMNI);
+  ASSERT_LE(shmall, shmmax);
+
+  // These values should never be higher than this by default, for more
+  // information see uapi/linux/shm.h
+  ASSERT_LE(shmmax, ULONG_MAX - (1UL << 24));
+  ASSERT_LE(shmall, ULONG_MAX - (1UL << 24));
+}
+
+TEST(ProcDefaults, PresenceOfSem) {
+  uint32_t semmsl = 0;
+  uint32_t semmns = 0;
+  uint32_t semopm = 0;
+  uint32_t semmni = 0;
+  std::string proc_file;
+  proc_file = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/sys/kernel/sem"));
+  ASSERT_FALSE(proc_file.empty());
+  std::vector<absl::string_view> sem_limits =
+      absl::StrSplit(proc_file, absl::ByAnyChar("\t"), absl::SkipWhitespace());
+  ASSERT_EQ(sem_limits.size(), 4);
+  ASSERT_TRUE(absl::SimpleAtoi(sem_limits[0], &semmsl));
+  ASSERT_TRUE(absl::SimpleAtoi(sem_limits[1], &semmns));
+  ASSERT_TRUE(absl::SimpleAtoi(sem_limits[2], &semopm));
+  ASSERT_TRUE(absl::SimpleAtoi(sem_limits[3], &semmni));
+
+  ASSERT_EQ(semmsl, SEMMSL);
+  ASSERT_EQ(semmns, SEMMNS);
+  ASSERT_EQ(semopm, SEMOPM);
+  ASSERT_EQ(semmni, SEMMNI);
+}
+
+}  // namespace
+}  // namespace testing
+}  // namespace gvisor