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#include <library/cpp/coroutine/engine/stack/stack_common.h>
#include <library/cpp/coroutine/engine/stack/stack_guards.h>
#include <library/cpp/coroutine/engine/stack/stack_utils.h>
#include <library/cpp/testing/gtest/gtest.h>
using namespace testing;
namespace NCoro::NStack::Tests {
template <class TGuard>
class TGuardFixture : public Test {
protected:
TGuardFixture() : Guard_(GetGuard<TGuard>()) {}
const TGuard& Guard_;
};
typedef Types<TCanaryGuard, TPageGuard> Implementations;
TYPED_TEST_SUITE(TGuardFixture, Implementations);
TYPED_TEST(TGuardFixture, GuardSize) {
const auto size = this->Guard_.GetSize();
EXPECT_GE(size, 64ul);
EXPECT_FALSE(size & 63ul); // check 64-byte alignment
}
TYPED_TEST(TGuardFixture, GuardAlignedSize) {
const auto size = this->Guard_.GetPageAlignedSize();
EXPECT_GE(size, PageSize);
EXPECT_FALSE(size & PageSizeMask); // check page-alignment
}
TYPED_TEST(TGuardFixture, StackWorkspace) {
for (size_t sizeInPages : {2, 5, 12}) {
char *rawPtr, *alignedPtr = nullptr;
ASSERT_TRUE(GetAlignedMemory(sizeInPages, rawPtr, alignedPtr));
auto workspace = this->Guard_.GetWorkspace(alignedPtr, sizeInPages * PageSize);
EXPECT_EQ(workspace.size(), sizeInPages * PageSize - this->Guard_.GetSize()) << " size in pages " << sizeInPages;
this->Guard_.Protect(alignedPtr, sizeInPages * PageSize, false);
workspace = this->Guard_.GetWorkspace(alignedPtr, sizeInPages * PageSize);
EXPECT_EQ(workspace.size(), sizeInPages * PageSize - this->Guard_.GetSize()) << " size in pages " << sizeInPages;
this->Guard_.RemoveProtection(alignedPtr, sizeInPages * PageSize);
workspace = this->Guard_.GetWorkspace(alignedPtr, sizeInPages * PageSize);
EXPECT_EQ(workspace.size(), sizeInPages * PageSize - this->Guard_.GetSize()) << " size in pages " << sizeInPages;
free(rawPtr);
}
}
TYPED_TEST(TGuardFixture, SetRemoveProtectionWorks) {
char *rawPtr, *alignedPtr = nullptr;
constexpr size_t sizeInPages = 4;
ASSERT_TRUE(GetAlignedMemory(sizeInPages + 1, rawPtr, alignedPtr));
this->Guard_.Protect(alignedPtr, PageSize, false); // set previous guard
alignedPtr += PageSize; // leave first page for previous guard
this->Guard_.Protect(alignedPtr, sizeInPages * PageSize, true);
EXPECT_TRUE(this->Guard_.CheckOverflow(alignedPtr));
EXPECT_TRUE(this->Guard_.CheckOverride(alignedPtr, sizeInPages * PageSize));
this->Guard_.RemoveProtection(alignedPtr, sizeInPages * PageSize);
this->Guard_.RemoveProtection(alignedPtr - PageSize, PageSize); // remove previous guard
free(rawPtr);
}
TEST(StackGuardTest, CanaryGuardTestOverflow) {
const auto& guard = GetGuard<TCanaryGuard>();
char *rawPtr, *alignedPtr = nullptr;
constexpr size_t sizeInPages = 4;
ASSERT_TRUE(GetAlignedMemory(sizeInPages + 1, rawPtr, alignedPtr));
guard.Protect(alignedPtr, PageSize, false); // set previous guard
alignedPtr += PageSize; // leave first page for previous guard
guard.Protect(alignedPtr, sizeInPages * PageSize, true);
EXPECT_TRUE(guard.CheckOverflow(alignedPtr));
EXPECT_TRUE(guard.CheckOverride(alignedPtr, sizeInPages * PageSize));
// Overwrite previous guard
*(alignedPtr - 1) = 42;
EXPECT_FALSE(guard.CheckOverflow(alignedPtr));
free(rawPtr);
}
TEST(StackGuardTest, CanaryGuardTestOverride) {
const auto& guard = GetGuard<TCanaryGuard>();
char *rawPtr, *alignedPtr = nullptr;
constexpr size_t sizeInPages = 4;
ASSERT_TRUE(GetAlignedMemory(sizeInPages + 1, rawPtr, alignedPtr));
guard.Protect(alignedPtr, PageSize, false); // set previous guard
alignedPtr += PageSize; // leave first page for previous guard
guard.Protect(alignedPtr, sizeInPages * PageSize, true);
EXPECT_TRUE(guard.CheckOverflow(alignedPtr));
EXPECT_TRUE(guard.CheckOverride(alignedPtr, sizeInPages * PageSize));
// Overwrite guard
*(alignedPtr + sizeInPages * PageSize - 1) = 42;
EXPECT_FALSE(guard.CheckOverride(alignedPtr, sizeInPages * PageSize));
free(rawPtr);
}
TEST(StackGuardDeathTest, PageGuardTestOverflow) {
ASSERT_DEATH({
const auto &guard = GetGuard<TPageGuard>();
char* rawPtr = nullptr;
char* alignedPtr = nullptr;
constexpr size_t sizeInPages = 4;
ASSERT_TRUE(GetAlignedMemory(sizeInPages + 1, rawPtr, alignedPtr));
guard.Protect(alignedPtr, PageSize, false); // set previous guard
alignedPtr += PageSize; // leave first page for previous guard
guard.Protect(alignedPtr, sizeInPages * PageSize, true);
// Overwrite previous guard, crash is here
*(alignedPtr - 1) = 42;
guard.RemoveProtection(alignedPtr, sizeInPages * PageSize);
guard.RemoveProtection(alignedPtr - PageSize, PageSize); // remove previous guard
free(rawPtr);
}, "");
}
TEST(StackGuardDeathTest, PageGuardTestOverride) {
ASSERT_DEATH({
const auto &guard = GetGuard<TPageGuard>();
char* rawPtr = nullptr;
char* alignedPtr = nullptr;
constexpr size_t sizeInPages = 4;
ASSERT_TRUE(GetAlignedMemory(sizeInPages + 1, rawPtr, alignedPtr));
guard.Protect(alignedPtr, PageSize, false); // set previous guard
alignedPtr += PageSize; // leave first page for previous guard
guard.Protect(alignedPtr, sizeInPages * PageSize, true);
// Overwrite guard, crash is here
*(alignedPtr + sizeInPages * PageSize - 1) = 42;
guard.RemoveProtection(alignedPtr, sizeInPages * PageSize);
guard.RemoveProtection(alignedPtr - PageSize, PageSize); // remove previous guard
free(rawPtr);
}, "");
}
}
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