49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <string.h>
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#include <sys/mman.h>
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#include <algorithm>
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#include "gtest/gtest.h"
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#include "test/util/fs_util.h"
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#include "test/util/posix_error.h"
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#include "test/util/proc_util.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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// Ensure that the vvar page cannot be made writable.
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TEST(VvarTest, WriteVvar) {
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auto contents = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/self/maps"));
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auto maps = ASSERT_NO_ERRNO_AND_VALUE(ParseProcMaps(contents));
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auto it = std::find_if(maps.begin(), maps.end(), [](const ProcMapsEntry& e) {
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return e.filename == "[vvar]";
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});
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SKIP_IF(it == maps.end());
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EXPECT_THAT(mprotect(reinterpret_cast<void*>(it->start), kPageSize,
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PROT_READ | PROT_WRITE),
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SyscallFailsWithErrno(EACCES));
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}
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} // namespace
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} // namespace testing
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} // namespace gvisor
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