97 lines
3.3 KiB
C++
97 lines
3.3 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 <errno.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <algorithm>
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#include <vector>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "test/util/memory_util.h"
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#include "test/util/posix_error.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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size_t CountSetLSBs(std::vector<unsigned char> const& vec) {
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return std::count_if(begin(vec), end(vec),
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[](unsigned char c) { return (c & 1) != 0; });
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}
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TEST(MincoreTest, DirtyAnonPagesAreResident) {
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constexpr size_t kTestPageCount = 10;
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auto const kTestMappingBytes = kTestPageCount * kPageSize;
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auto m = ASSERT_NO_ERRNO_AND_VALUE(
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MmapAnon(kTestMappingBytes, PROT_READ | PROT_WRITE, MAP_PRIVATE));
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memset(m.ptr(), 0, m.len());
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std::vector<unsigned char> vec(kTestPageCount, 0);
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ASSERT_THAT(mincore(m.ptr(), kTestMappingBytes, vec.data()),
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SyscallSucceeds());
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EXPECT_EQ(kTestPageCount, CountSetLSBs(vec));
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}
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TEST(MincoreTest, UnalignedAddressFails) {
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// Map and touch two pages, then try to mincore the second half of the first
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// page + the first half of the second page. Both pages are mapped, but
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// mincore should return EINVAL due to the misaligned start address.
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constexpr size_t kTestPageCount = 2;
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auto const kTestMappingBytes = kTestPageCount * kPageSize;
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auto m = ASSERT_NO_ERRNO_AND_VALUE(
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MmapAnon(kTestMappingBytes, PROT_READ | PROT_WRITE, MAP_PRIVATE));
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memset(m.ptr(), 0, m.len());
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std::vector<unsigned char> vec(kTestPageCount, 0);
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EXPECT_THAT(mincore(reinterpret_cast<void*>(m.addr() + kPageSize / 2),
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kPageSize, vec.data()),
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SyscallFailsWithErrno(EINVAL));
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}
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TEST(MincoreTest, UnalignedLengthSucceedsAndIsRoundedUp) {
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// Map and touch two pages, then try to mincore the first page + the first
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// half of the second page. mincore should silently round up the length to
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// include both pages.
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constexpr size_t kTestPageCount = 2;
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auto const kTestMappingBytes = kTestPageCount * kPageSize;
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auto m = ASSERT_NO_ERRNO_AND_VALUE(
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MmapAnon(kTestMappingBytes, PROT_READ | PROT_WRITE, MAP_PRIVATE));
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memset(m.ptr(), 0, m.len());
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std::vector<unsigned char> vec(kTestPageCount, 0);
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ASSERT_THAT(mincore(m.ptr(), kPageSize + kPageSize / 2, vec.data()),
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SyscallSucceeds());
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EXPECT_EQ(kTestPageCount, CountSetLSBs(vec));
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}
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TEST(MincoreTest, ZeroLengthSucceedsAndAllowsAnyVecBelowTaskSize) {
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EXPECT_THAT(mincore(nullptr, 0, nullptr), SyscallSucceeds());
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}
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TEST(MincoreTest, InvalidLengthFails) {
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EXPECT_THAT(mincore(nullptr, -1, nullptr), SyscallFailsWithErrno(ENOMEM));
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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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