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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 "components/gwp_asan/common/allocator_state.h"
#include <limits>
#include "base/memory/page_size.h"
#include "base/test/gtest_util.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace gwp_asan {
namespace internal {
using GetMetadataReturnType = AllocatorState::GetMetadataReturnType;
static constexpr size_t kMaxMetadata = AllocatorState::kMaxMetadata;
static constexpr size_t kMaxRequestedSlots = AllocatorState::kMaxRequestedSlots;
static constexpr size_t kMaxReservedSlots = AllocatorState::kMaxReservedSlots;
class AllocatorStateTest : public testing::Test {
protected:
void InitializeState(size_t page_size,
size_t num_metadata,
size_t total_requested_pages,
size_t total_reserved_pages,
int base_addr_offset = 0,
int first_page_offset = 0,
int end_addr_offset = 0) {
state_.page_size = page_size;
state_.num_metadata = num_metadata;
state_.total_requested_pages = total_requested_pages;
state_.total_reserved_pages = total_reserved_pages;
// Some arbitrary page-aligned address
const uintptr_t base = page_size * 10;
state_.pages_base_addr = base_addr_offset + base;
state_.first_page_addr = first_page_offset + base + page_size;
state_.pages_end_addr =
end_addr_offset + base + page_size * (total_reserved_pages * 2 + 1);
// An invalid address, but it's never dereferenced in AllocatorState.
state_.metadata_addr = 0x1234;
state_.slot_to_metadata_addr = 0x1234;
}
AllocatorState state_;
};
TEST_F(AllocatorStateTest, Valid) {
InitializeState(base::GetPageSize(), 1, 1, 1);
EXPECT_TRUE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, kMaxRequestedSlots,
kMaxRequestedSlots);
EXPECT_TRUE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, kMaxRequestedSlots,
kMaxReservedSlots);
EXPECT_TRUE(state_.IsValid());
InitializeState(base::GetPageSize(), kMaxMetadata, kMaxRequestedSlots,
kMaxRequestedSlots);
EXPECT_TRUE(state_.IsValid());
InitializeState(base::GetPageSize(), kMaxMetadata, kMaxRequestedSlots,
kMaxReservedSlots);
EXPECT_TRUE(state_.IsValid());
}
TEST_F(AllocatorStateTest, InvalidNumMetadata) {
InitializeState(base::GetPageSize(), 0, kMaxRequestedSlots,
kMaxReservedSlots);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), kMaxMetadata + 1, kMaxRequestedSlots,
kMaxReservedSlots);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 2, 1, 1);
EXPECT_FALSE(state_.IsValid());
}
TEST_F(AllocatorStateTest, InvalidNumPages) {
InitializeState(base::GetPageSize(), 1, 0, 0);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, 0, 1);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, 1, 0);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, kMaxRequestedSlots + 1,
kMaxReservedSlots);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, kMaxRequestedSlots,
kMaxReservedSlots + 1);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, kMaxRequestedSlots + 1,
kMaxReservedSlots + 1);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, std::numeric_limits<size_t>::max(),
std::numeric_limits<size_t>::max());
EXPECT_FALSE(state_.IsValid());
}
TEST_F(AllocatorStateTest, InvalidPageSize) {
InitializeState(0, 1, 1, 1);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize() + 1, 1, 1, 1);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize() * 2, 1, 1, 1);
EXPECT_FALSE(state_.IsValid());
}
TEST_F(AllocatorStateTest, InvalidAddresses) {
// Invalid [pages_base_addr, first_page_addr, pages_end_addr]
InitializeState(base::GetPageSize(), 1, 1, 1, 1, 1, 1);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, 1, 1, 1, 0, 0);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, 1, 1, 0, 1, 0);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, 1, 1, 0, 0, 1);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, 1, 1, base::GetPageSize(), 0, 0);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, 1, 1, 0, base::GetPageSize(), 0);
EXPECT_FALSE(state_.IsValid());
InitializeState(base::GetPageSize(), 1, 1, 1, 0, 0, base::GetPageSize());
EXPECT_FALSE(state_.IsValid());
}
TEST_F(AllocatorStateTest, GetNearestValidPageEdgeCases) {
InitializeState(base::GetPageSize(), kMaxMetadata, kMaxRequestedSlots,
kMaxReservedSlots);
EXPECT_TRUE(state_.IsValid());
EXPECT_EQ(
state_.GetPageAddr(state_.GetNearestValidPage(state_.pages_base_addr)),
state_.first_page_addr);
EXPECT_EQ(
state_.GetPageAddr(state_.GetNearestValidPage(state_.pages_end_addr - 1)),
state_.pages_end_addr - (2 * state_.page_size));
}
TEST_F(AllocatorStateTest, GetErrorTypeEdgeCases) {
InitializeState(base::GetPageSize(), kMaxMetadata, kMaxRequestedSlots,
kMaxReservedSlots);
EXPECT_TRUE(state_.IsValid());
EXPECT_EQ(state_.GetErrorType(state_.pages_base_addr, true, false),
AllocatorState::ErrorType::kBufferUnderflow);
EXPECT_EQ(state_.GetErrorType(state_.pages_end_addr - 1, true, false),
AllocatorState::ErrorType::kBufferOverflow);
}
// Correctly handle the edge case when a free() occurs on a page that has never
// been allocated.
TEST_F(AllocatorStateTest, GetErrorTypeFreeInvalidAddressEdgeCase) {
InitializeState(base::GetPageSize(), kMaxMetadata, kMaxRequestedSlots,
kMaxReservedSlots);
EXPECT_TRUE(state_.IsValid());
state_.free_invalid_address = state_.first_page_addr;
EXPECT_EQ(state_.GetErrorType(state_.first_page_addr, false, false),
AllocatorState::ErrorType::kFreeInvalidAddress);
}
TEST_F(AllocatorStateTest, GetMetadataForAddress) {
constexpr size_t kTestSlots = 10;
InitializeState(base::GetPageSize(), 2, kTestSlots, kTestSlots);
AllocatorState::SlotMetadata md[2];
md[0].alloc_ptr = state_.first_page_addr;
AllocatorState::MetadataIdx slot_to_metadata[kTestSlots];
AllocatorState::MetadataIdx idx;
std::string error;
#if defined(GTEST_HAS_DEATH_TEST)
EXPECT_DEATH(
{
state_.GetMetadataForAddress(state_.pages_base_addr - 1, md,
slot_to_metadata, &idx, &error);
},
"");
#endif
slot_to_metadata[0] = AllocatorState::kInvalidMetadataIdx;
EXPECT_EQ(state_.GetMetadataForAddress(state_.first_page_addr, md,
slot_to_metadata, &idx, &error),
GetMetadataReturnType::kGwpAsanCrashWithMissingMetadata);
slot_to_metadata[0] = 0;
ASSERT_EQ(state_.GetMetadataForAddress(state_.first_page_addr, md,
slot_to_metadata, &idx, &error),
GetMetadataReturnType::kGwpAsanCrash);
EXPECT_EQ(idx, 0);
slot_to_metadata[0] = kTestSlots;
EXPECT_EQ(state_.GetMetadataForAddress(state_.first_page_addr, md,
slot_to_metadata, &idx, &error),
GetMetadataReturnType::kErrorBadMetadataIndex);
// Metadata[0] is for slot 1, slot_to_metadata_idx[0] point to metadata 0.
md[0].alloc_ptr = state_.first_page_addr + state_.page_size * 2;
slot_to_metadata[0] = 0;
EXPECT_EQ(state_.GetMetadataForAddress(state_.first_page_addr, md,
slot_to_metadata, &idx, &error),
GetMetadataReturnType::kErrorOutdatedMetadataIndex);
// It's impossible to trigger kErrorBadSlotIndex.
}
} // namespace internal
} // namespace gwp_asan
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