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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sandbox/policy/win/sandbox_warmup.h"
#include <windows.h>
#include <dwrite.h>
#include <wrl/client.h>
#include "base/rand_util.h"
#include "sandbox/win/src/sandbox.h"
#include "sandbox/win/src/sandbox_factory.h"
#include "sandbox/win/src/target_services.h"
#include "sandbox/win/src/win_utils.h"
#include "sandbox/win/tests/common/controller.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace sandbox {
SBOX_TESTS_COMMAND int WarmupRandomness(int argc, wchar_t** argv) {
static int state = BEFORE_INIT;
switch (state++) {
case BEFORE_INIT: {
// Warmup.
sandbox::policy::WarmupRandomnessInfrastructure();
return SBOX_TEST_SUCCEEDED;
}
case AFTER_REVERT: {
const auto bytes = base::RandBytesAsVector(23);
EXPECT_EQ(bytes.size(), 23u);
return SBOX_TEST_SUCCEEDED;
}
default: // Do nothing.
break;
}
return SBOX_TEST_SUCCEEDED;
}
// Do something with Dwrite.dll to validate that the IAT hook used for Csrss
// applies without crashing. The hooked call within dwrite.dll is not
// straightforward to trigger, so this test mainly validates that the import to
// hook is present.
SBOX_TESTS_COMMAND int HookDwrite(int argc, wchar_t** argv) {
static int state = BEFORE_INIT;
static HMODULE dwrite_mod = nullptr;
switch (state++) {
case BEFORE_INIT: {
// Load dwrite.dll so that the IATHook is applied, keep the handle.
dwrite_mod = ::LoadLibraryW(L"dwrite.dll");
CHECK(dwrite_mod);
// Apply the hook. This may fail if dwrite's imports change in future
// versions of Windows.
CHECK(sandbox::policy::HookDwriteGetUserDefaultLCID());
return SBOX_TEST_SUCCEEDED;
}
case AFTER_REVERT: {
// Use dwrite.dll.
decltype(DWriteCreateFactory)* DWriteCreateFactoryFn =
reinterpret_cast<decltype(DWriteCreateFactory)*>(
::GetProcAddress(dwrite_mod, "DWriteCreateFactory"));
CHECK(DWriteCreateFactoryFn);
{
Microsoft::WRL::ComPtr<IUnknown> dwrite_factory;
HRESULT hr =
DWriteCreateFactoryFn(DWRITE_FACTORY_TYPE_SHARED,
__uuidof(IDWriteFactory), &dwrite_factory);
CHECK(hr == S_OK);
}
// Should be safe to unload dwrite.dll without crashing.
::FreeLibrary(dwrite_mod);
return SBOX_TEST_SUCCEEDED;
}
default: // Do nothing.
break;
}
return SBOX_TEST_SUCCEEDED;
}
TEST(SandboxPolicyWarmup, Randomness) {
TestRunner runner;
runner.SetTimeout(2000);
runner.SetTestState(EVERY_STATE);
EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(L"WarmupRandomness"));
}
TEST(SandboxPolicyWarmup, HookDwrite) {
TestRunner runner;
runner.SetTimeout(2000);
runner.SetTestState(EVERY_STATE);
EXPECT_EQ(SBOX_TEST_SUCCEEDED, runner.RunTest(L"HookDwrite"));
}
} // namespace sandbox
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