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// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <vector>
#include "src/security/vm-cage.h"
#include "test/unittests/test-utils.h"
#ifdef V8_VIRTUAL_MEMORY_CAGE_IS_AVAILABLE
namespace v8 {
namespace internal {
TEST(VirtualMemoryCageTest, Initialization) {
base::PageAllocator page_allocator;
V8VirtualMemoryCage cage;
EXPECT_FALSE(cage.is_initialized());
EXPECT_FALSE(cage.is_disabled());
EXPECT_FALSE(cage.is_fake_cage());
EXPECT_EQ(cage.size(), 0UL);
EXPECT_TRUE(cage.Initialize(&page_allocator));
EXPECT_TRUE(cage.is_initialized());
EXPECT_NE(cage.base(), 0UL);
EXPECT_GT(cage.size(), 0UL);
cage.TearDown();
EXPECT_FALSE(cage.is_initialized());
}
TEST(VirtualMemoryCageTest, InitializationWithSize) {
base::PageAllocator page_allocator;
V8VirtualMemoryCage cage;
size_t size = kVirtualMemoryCageMinimumSize;
const bool use_guard_regions = false;
EXPECT_TRUE(cage.Initialize(&page_allocator, size, use_guard_regions));
EXPECT_TRUE(cage.is_initialized());
EXPECT_FALSE(cage.is_fake_cage());
EXPECT_EQ(cage.size(), size);
cage.TearDown();
}
TEST(VirtualMemoryCageTest, InitializationAsFakeCage) {
base::PageAllocator page_allocator;
V8VirtualMemoryCage cage;
// Total size of the fake cage.
size_t size = kVirtualMemoryCageSize;
// Size of the virtual memory that is actually reserved at the start of the
// cage.
size_t reserved_size = 2 * page_allocator.AllocatePageSize();
EXPECT_TRUE(cage.InitializeAsFakeCage(&page_allocator, size, reserved_size));
EXPECT_TRUE(cage.is_initialized());
EXPECT_TRUE(cage.is_fake_cage());
EXPECT_NE(cage.base(), 0UL);
EXPECT_EQ(cage.size(), size);
cage.TearDown();
EXPECT_FALSE(cage.is_initialized());
}
TEST(VirtualMemloryCageTest, Contains) {
base::PageAllocator page_allocator;
V8VirtualMemoryCage cage;
EXPECT_TRUE(cage.Initialize(&page_allocator));
Address base = cage.base();
size_t size = cage.size();
base::RandomNumberGenerator rng(::testing::FLAGS_gtest_random_seed);
EXPECT_TRUE(cage.Contains(base));
EXPECT_TRUE(cage.Contains(base + size - 1));
for (int i = 0; i < 10; i++) {
size_t offset = rng.NextInt64() % size;
EXPECT_TRUE(cage.Contains(base + offset));
}
EXPECT_FALSE(cage.Contains(base - 1));
EXPECT_FALSE(cage.Contains(base + size));
for (int i = 0; i < 10; i++) {
Address addr = rng.NextInt64();
if (addr < base || addr >= base + size) {
EXPECT_FALSE(cage.Contains(addr));
}
}
cage.TearDown();
}
void TestCagePageAllocation(V8VirtualMemoryCage& cage) {
const size_t kAllocatinSizesInPages[] = {1, 1, 2, 3, 5, 8, 13, 21, 34};
constexpr int kNumAllocations = arraysize(kAllocatinSizesInPages);
PageAllocator* allocator = cage.page_allocator();
size_t page_size = allocator->AllocatePageSize();
std::vector<void*> allocations;
for (int i = 0; i < kNumAllocations; i++) {
size_t length = page_size * kAllocatinSizesInPages[i];
size_t alignment = page_size;
void* ptr = allocator->AllocatePages(nullptr, length, alignment,
PageAllocator::kNoAccess);
EXPECT_NE(ptr, nullptr);
EXPECT_TRUE(cage.Contains(ptr));
allocations.push_back(ptr);
}
for (int i = 0; i < kNumAllocations; i++) {
size_t length = page_size * kAllocatinSizesInPages[i];
allocator->FreePages(allocations[i], length);
}
}
TEST(VirtualMemoryCageTest, PageAllocation) {
base::PageAllocator page_allocator;
V8VirtualMemoryCage cage;
EXPECT_TRUE(cage.Initialize(&page_allocator));
TestCagePageAllocation(cage);
cage.TearDown();
}
TEST(VirtualMemoryCageTest, FakeCagePageAllocation) {
base::PageAllocator page_allocator;
V8VirtualMemoryCage cage;
size_t size = kVirtualMemoryCageSize;
// Only reserve two pages so the test will allocate memory inside and outside
// of the reserved region.
size_t reserved_size = 2 * page_allocator.AllocatePageSize();
EXPECT_TRUE(cage.InitializeAsFakeCage(&page_allocator, size, reserved_size));
TestCagePageAllocation(cage);
cage.TearDown();
}
} // namespace internal
} // namespace v8
#endif // V8_VIRTUAL_MEMORY_CAGE_IS_AVAILABLE
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