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// 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/mman.h>
#include <unistd.h>
#include <functional>
#include <string>
#include <utility>
#include <vector>
#include "test/util/file_descriptor.h"
#include "test/util/memory_util.h"
#include "test/util/posix_error.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
// Parameters for msync tests. Use a std::tuple so we can use
// ::testing::Combine.
using MsyncTestParam =
std::tuple<int, // msync flags
std::function<PosixErrorOr<Mapping>()> // returns mapping to
// msync
>;
class MsyncParameterizedTest : public ::testing::TestWithParam<MsyncTestParam> {
protected:
int msync_flags() const { return std::get<0>(GetParam()); }
PosixErrorOr<Mapping> GetMapping() const { return std::get<1>(GetParam())(); }
};
// All valid msync(2) flag combinations, not including MS_INVALIDATE. ("Linux
// permits a call to msync() that specifies neither [MS_SYNC or MS_ASYNC], with
// semantics that are (currently) equivalent to specifying MS_ASYNC." -
// msync(2))
constexpr std::initializer_list<int> kMsyncFlags = {MS_SYNC, MS_ASYNC, 0};
// Returns functions that return mappings that should be successfully
// msync()able.
std::vector<std::function<PosixErrorOr<Mapping>()>> SyncableMappings() {
std::vector<std::function<PosixErrorOr<Mapping>()>> funcs;
for (bool const writable : {false, true}) {
for (int const mflags : {MAP_PRIVATE, MAP_SHARED}) {
int const prot = PROT_READ | (writable ? PROT_WRITE : 0);
int const oflags = O_CREAT | (writable ? O_RDWR : O_RDONLY);
funcs.push_back([=] { return MmapAnon(kPageSize, prot, mflags); });
funcs.push_back([=]() -> PosixErrorOr<Mapping> {
std::string const path = NewTempAbsPath();
ASSIGN_OR_RETURN_ERRNO(auto fd, Open(path, oflags, 0644));
// Don't unlink the file since that breaks save/restore. Just let the
// test infrastructure clean up all of our temporary files when we're
// done.
return Mmap(nullptr, kPageSize, prot, mflags, fd.get(), 0);
});
}
}
return funcs;
}
PosixErrorOr<Mapping> NoMappings() {
return PosixError(EINVAL, "unexpected attempt to create a mapping");
}
// "Fixture" for msync tests that hold for all valid flags, but do not create
// mappings.
using MsyncNoMappingTest = MsyncParameterizedTest;
TEST_P(MsyncNoMappingTest, UnmappedAddressWithZeroLengthSucceeds) {
EXPECT_THAT(msync(nullptr, 0, msync_flags()), SyscallSucceeds());
}
TEST_P(MsyncNoMappingTest, UnmappedAddressWithNonzeroLengthFails) {
EXPECT_THAT(msync(nullptr, kPageSize, msync_flags()),
SyscallFailsWithErrno(ENOMEM));
}
INSTANTIATE_TEST_SUITE_P(All, MsyncNoMappingTest,
::testing::Combine(::testing::ValuesIn(kMsyncFlags),
::testing::Values(NoMappings)));
// "Fixture" for msync tests that are not parameterized by msync flags, but do
// create mappings.
using MsyncNoFlagsTest = MsyncParameterizedTest;
TEST_P(MsyncNoFlagsTest, BothSyncAndAsyncFails) {
auto m = ASSERT_NO_ERRNO_AND_VALUE(GetMapping());
EXPECT_THAT(msync(m.ptr(), m.len(), MS_SYNC | MS_ASYNC),
SyscallFailsWithErrno(EINVAL));
}
INSTANTIATE_TEST_SUITE_P(
All, MsyncNoFlagsTest,
::testing::Combine(::testing::Values(0), // ignored
::testing::ValuesIn(SyncableMappings())));
// "Fixture" for msync tests parameterized by both msync flags and sources of
// mappings.
using MsyncFullParamTest = MsyncParameterizedTest;
TEST_P(MsyncFullParamTest, NormallySucceeds) {
auto m = ASSERT_NO_ERRNO_AND_VALUE(GetMapping());
EXPECT_THAT(msync(m.ptr(), m.len(), msync_flags()), SyscallSucceeds());
}
TEST_P(MsyncFullParamTest, UnalignedLengthSucceeds) {
auto m = ASSERT_NO_ERRNO_AND_VALUE(GetMapping());
EXPECT_THAT(msync(m.ptr(), m.len() - 1, msync_flags()), SyscallSucceeds());
}
TEST_P(MsyncFullParamTest, UnalignedAddressFails) {
auto m = ASSERT_NO_ERRNO_AND_VALUE(GetMapping());
EXPECT_THAT(
msync(reinterpret_cast<void*>(m.addr() + 1), m.len() - 1, msync_flags()),
SyscallFailsWithErrno(EINVAL));
}
TEST_P(MsyncFullParamTest, InvalidateUnlockedSucceeds) {
auto m = ASSERT_NO_ERRNO_AND_VALUE(GetMapping());
EXPECT_THAT(msync(m.ptr(), m.len(), msync_flags() | MS_INVALIDATE),
SyscallSucceeds());
}
// The test for MS_INVALIDATE on mlocked pages is in mlock.cc since it requires
// probing for mlock support.
INSTANTIATE_TEST_SUITE_P(
All, MsyncFullParamTest,
::testing::Combine(::testing::ValuesIn(kMsyncFlags),
::testing::ValuesIn(SyncableMappings())));
} // namespace
} // namespace testing
} // namespace gvisor
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