1 files changed, 75 insertions, 0 deletions
diff --git a/test/syscalls/linux/rlimits.cc b/test/syscalls/linux/rlimits.cc
new file mode 100644
index 000000000..860f0f688
--- /dev/null
+++ b/test/syscalls/linux/rlimits.cc
@@ -0,0 +1,75 @@
+// Copyright 2018 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 <sys/resource.h>
+#include <sys/time.h>
+
+#include "test/util/capability_util.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+TEST(RlimitTest, SetRlimitHigher) {
+  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_RESOURCE)));
+
+  struct rlimit rl = {};
+  EXPECT_THAT(getrlimit(RLIMIT_NOFILE, &rl), SyscallSucceeds());
+
+  // Lower the rlimit first, as it may be equal to /proc/sys/fs/nr_open, in
+  // which case even users with CAP_SYS_RESOURCE can't raise it.
+  rl.rlim_cur--;
+  rl.rlim_max--;
+  ASSERT_THAT(setrlimit(RLIMIT_NOFILE, &rl), SyscallSucceeds());
+
+  rl.rlim_max++;
+  EXPECT_THAT(setrlimit(RLIMIT_NOFILE, &rl), SyscallSucceeds());
+}
+
+TEST(RlimitTest, UnprivilegedSetRlimit) {
+  // Drop privileges if necessary.
+  if (ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_RESOURCE))) {
+    EXPECT_NO_ERRNO(SetCapability(CAP_SYS_RESOURCE, false));
+  }
+
+  struct rlimit rl = {};
+  rl.rlim_cur = 1000;
+  rl.rlim_max = 20000;
+  EXPECT_THAT(setrlimit(RLIMIT_NOFILE, &rl), SyscallSucceeds());
+
+  struct rlimit rl2 = {};
+  EXPECT_THAT(getrlimit(RLIMIT_NOFILE, &rl2), SyscallSucceeds());
+  EXPECT_EQ(rl.rlim_cur, rl2.rlim_cur);
+  EXPECT_EQ(rl.rlim_max, rl2.rlim_max);
+
+  rl.rlim_max = 100000;
+  EXPECT_THAT(setrlimit(RLIMIT_NOFILE, &rl), SyscallFailsWithErrno(EPERM));
+}
+
+TEST(RlimitTest, SetSoftRlimitAboveHard) {
+  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_RESOURCE)));
+
+  struct rlimit rl = {};
+  EXPECT_THAT(getrlimit(RLIMIT_NOFILE, &rl), SyscallSucceeds());
+
+  rl.rlim_cur = rl.rlim_max + 1;
+  EXPECT_THAT(setrlimit(RLIMIT_NOFILE, &rl), SyscallFailsWithErrno(EINVAL));
+}
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor