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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/memory/shared_memory_mapping.h"
#include <stdint.h>
#include <limits>
#include "base/containers/span.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/writable_shared_memory_region.h"
#include "base/ranges/algorithm.h"
#include "build/build_config.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
class SharedMemoryMappingTest : public ::testing::Test {
protected:
void CreateMapping(size_t size) {
auto result = ReadOnlySharedMemoryRegion::Create(size);
ASSERT_TRUE(result.IsValid());
write_mapping_ = std::move(result.mapping);
read_mapping_ = result.region.Map();
ASSERT_TRUE(read_mapping_.IsValid());
}
WritableSharedMemoryMapping write_mapping_;
ReadOnlySharedMemoryMapping read_mapping_;
};
TEST_F(SharedMemoryMappingTest, Invalid) {
EXPECT_EQ(nullptr, write_mapping_.GetMemoryAs<uint8_t>());
EXPECT_EQ(nullptr, read_mapping_.GetMemoryAs<uint8_t>());
EXPECT_TRUE(write_mapping_.GetMemoryAsSpan<uint8_t>().empty());
EXPECT_TRUE(read_mapping_.GetMemoryAsSpan<uint8_t>().empty());
EXPECT_TRUE(write_mapping_.GetMemoryAsSpan<uint8_t>(1).empty());
EXPECT_TRUE(read_mapping_.GetMemoryAsSpan<uint8_t>(1).empty());
}
TEST_F(SharedMemoryMappingTest, Scalar) {
CreateMapping(sizeof(uint32_t));
uint32_t* write_ptr = write_mapping_.GetMemoryAs<uint32_t>();
EXPECT_NE(nullptr, write_ptr);
const uint32_t* read_ptr = read_mapping_.GetMemoryAs<uint32_t>();
EXPECT_NE(nullptr, read_ptr);
*write_ptr = 0u;
EXPECT_EQ(0u, *read_ptr);
*write_ptr = 0x12345678u;
EXPECT_EQ(0x12345678u, *read_ptr);
}
TEST_F(SharedMemoryMappingTest, SpanWithAutoDeducedElementCount) {
CreateMapping(sizeof(uint8_t) * 8);
span<uint8_t> write_span = write_mapping_.GetMemoryAsSpan<uint8_t>();
ASSERT_EQ(8u, write_span.size());
span<const uint32_t> read_span = read_mapping_.GetMemoryAsSpan<uint32_t>();
ASSERT_EQ(2u, read_span.size());
ranges::fill(write_span, 0);
EXPECT_EQ(0u, read_span[0]);
EXPECT_EQ(0u, read_span[1]);
for (size_t i = 0; i < write_span.size(); ++i)
write_span[i] = i + 1;
EXPECT_EQ(0x04030201u, read_span[0]);
EXPECT_EQ(0x08070605u, read_span[1]);
}
TEST_F(SharedMemoryMappingTest, SpanWithExplicitElementCount) {
CreateMapping(sizeof(uint8_t) * 8);
span<uint8_t> write_span = write_mapping_.GetMemoryAsSpan<uint8_t>(8);
ASSERT_EQ(8u, write_span.size());
span<uint8_t> write_span_2 = write_mapping_.GetMemoryAsSpan<uint8_t>(4);
ASSERT_EQ(4u, write_span_2.size());
span<const uint32_t> read_span = read_mapping_.GetMemoryAsSpan<uint32_t>(2);
ASSERT_EQ(2u, read_span.size());
span<const uint32_t> read_span_2 = read_mapping_.GetMemoryAsSpan<uint32_t>(1);
ASSERT_EQ(1u, read_span_2.size());
ranges::fill(write_span, 0);
EXPECT_EQ(0u, read_span[0]);
EXPECT_EQ(0u, read_span[1]);
EXPECT_EQ(0u, read_span_2[0]);
for (size_t i = 0; i < write_span.size(); ++i)
write_span[i] = i + 1;
EXPECT_EQ(0x04030201u, read_span[0]);
EXPECT_EQ(0x08070605u, read_span[1]);
EXPECT_EQ(0x04030201u, read_span_2[0]);
ranges::fill(write_span_2, 0);
EXPECT_EQ(0u, read_span[0]);
EXPECT_EQ(0x08070605u, read_span[1]);
EXPECT_EQ(0u, read_span_2[0]);
}
TEST_F(SharedMemoryMappingTest, SpanWithZeroElementCount) {
CreateMapping(sizeof(uint8_t) * 8);
EXPECT_TRUE(write_mapping_.GetMemoryAsSpan<uint8_t>(0).empty());
EXPECT_TRUE(read_mapping_.GetMemoryAsSpan<uint8_t>(0).empty());
}
TEST_F(SharedMemoryMappingTest, TooBigScalar) {
CreateMapping(sizeof(uint8_t));
EXPECT_EQ(nullptr, write_mapping_.GetMemoryAs<uint32_t>());
EXPECT_EQ(nullptr, read_mapping_.GetMemoryAs<uint32_t>());
}
TEST_F(SharedMemoryMappingTest, TooBigSpanWithAutoDeducedElementCount) {
CreateMapping(sizeof(uint8_t));
EXPECT_TRUE(write_mapping_.GetMemoryAsSpan<uint32_t>().empty());
EXPECT_TRUE(read_mapping_.GetMemoryAsSpan<uint32_t>().empty());
}
TEST_F(SharedMemoryMappingTest, TooBigSpanWithExplicitElementCount) {
CreateMapping(sizeof(uint8_t));
// Deliberately pick element counts such that a naive bounds calculation would
// overflow.
EXPECT_TRUE(write_mapping_
.GetMemoryAsSpan<uint32_t>(std::numeric_limits<size_t>::max())
.empty());
EXPECT_TRUE(read_mapping_
.GetMemoryAsSpan<uint32_t>(std::numeric_limits<size_t>::max())
.empty());
}
// TODO(dcheng): This test is temporarily disabled on iOS. iOS devices allow
// the creation of a 1GB shared memory region, but don't allow the region to be
// mapped.
#if !BUILDFLAG(IS_IOS)
// TODO(crbug.com/1334079) Fix flakiness and re-enable on Linux and ChromeOS.
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
#define MAYBE_TotalMappedSizeLimit DISABLED_TotalMappedSizeLimit
#else
#define MAYBE_TotalMappedSizeLimit TotalMappedSizeLimit
#endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
TEST_F(SharedMemoryMappingTest, MAYBE_TotalMappedSizeLimit) {
// Nothing interesting to test if the address space isn't 64 bits, since
// there's no real limit enforced on 32 bits other than complete address
// space exhaustion.
// Also exclude NaCl since pointers are 32 bits on all architectures:
// https://bugs.chromium.org/p/nativeclient/issues/detail?id=1162
#if defined(ARCH_CPU_64_BITS) && !BUILDFLAG(IS_NACL)
auto region = WritableSharedMemoryRegion::Create(1024 * 1024 * 1024);
ASSERT_TRUE(region.IsValid());
// The limit is 32GB of mappings on 64-bit platforms, so the final mapping
// should fail.
std::vector<WritableSharedMemoryMapping> mappings(32);
for (size_t i = 0; i < mappings.size(); ++i) {
SCOPED_TRACE(i);
auto& mapping = mappings[i];
mapping = region.Map();
EXPECT_EQ(&mapping != &mappings.back(), mapping.IsValid());
}
#endif // defined(ARCH_CPU_64_BITS)
}
#endif // !BUILDFLAG(IS_IOS)
} // namespace base
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