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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 <string.h>
#include <sys/mman.h>
#include <algorithm>
#include "gtest/gtest.h"
#include "test/util/fs_util.h"
#include "test/util/posix_error.h"
#include "test/util/proc_util.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
// Ensure that the vvar page cannot be made writable.
TEST(VvarTest, WriteVvar) {
auto contents = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/self/maps"));
auto maps = ASSERT_NO_ERRNO_AND_VALUE(ParseProcMaps(contents));
auto it = std::find_if(maps.begin(), maps.end(), [](const ProcMapsEntry& e) {
return e.filename == "[vvar]";
});
SKIP_IF(it == maps.end());
EXPECT_THAT(mprotect(reinterpret_cast<void*>(it->start), kPageSize,
PROT_READ | PROT_WRITE),
SyscallFailsWithErrno(EACCES));
}
} // namespace
} // namespace testing
} // namespace gvisor
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