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123 lines
4.1 KiB
123 lines
4.1 KiB
//===-- backtrace.cpp -------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include <string>
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#include "gwp_asan/common.h"
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#include "gwp_asan/crash_handler.h"
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#include "gwp_asan/tests/harness.h"
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// Optnone to ensure that the calls to these functions are not optimized away,
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// as we're looking for them in the backtraces.
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__attribute((optnone)) void *
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AllocateMemory(gwp_asan::GuardedPoolAllocator &GPA) {
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return GPA.allocate(1);
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}
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__attribute((optnone)) void
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DeallocateMemory(gwp_asan::GuardedPoolAllocator &GPA, void *Ptr) {
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GPA.deallocate(Ptr);
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}
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__attribute((optnone)) void
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DeallocateMemory2(gwp_asan::GuardedPoolAllocator &GPA, void *Ptr) {
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GPA.deallocate(Ptr);
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}
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__attribute__((optnone)) void TouchMemory(void *Ptr) {
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*(reinterpret_cast<volatile char *>(Ptr)) = 7;
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}
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TEST_F(BacktraceGuardedPoolAllocator, DoubleFree) {
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void *Ptr = AllocateMemory(GPA);
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DeallocateMemory(GPA, Ptr);
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std::string DeathRegex = "Double Free.*";
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DeathRegex.append("DeallocateMemory2.*");
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DeathRegex.append("was deallocated.*");
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DeathRegex.append("DeallocateMemory.*");
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DeathRegex.append("was allocated.*");
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DeathRegex.append("AllocateMemory.*");
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ASSERT_DEATH(DeallocateMemory2(GPA, Ptr), DeathRegex);
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}
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TEST_F(BacktraceGuardedPoolAllocator, UseAfterFree) {
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void *Ptr = AllocateMemory(GPA);
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DeallocateMemory(GPA, Ptr);
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std::string DeathRegex = "Use After Free.*";
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DeathRegex.append("TouchMemory.*");
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DeathRegex.append("was deallocated.*");
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DeathRegex.append("DeallocateMemory.*");
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DeathRegex.append("was allocated.*");
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DeathRegex.append("AllocateMemory.*");
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ASSERT_DEATH(TouchMemory(Ptr), DeathRegex);
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}
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TEST(Backtrace, Short) {
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gwp_asan::AllocationMetadata Meta;
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Meta.AllocationTrace.RecordBacktrace(
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[](uintptr_t *TraceBuffer, size_t /* Size */) -> size_t {
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TraceBuffer[0] = 123u;
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TraceBuffer[1] = 321u;
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return 2u;
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});
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uintptr_t TraceOutput[2] = {};
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EXPECT_EQ(2u, __gwp_asan_get_allocation_trace(&Meta, TraceOutput, 2));
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EXPECT_EQ(TraceOutput[0], 123u);
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EXPECT_EQ(TraceOutput[1], 321u);
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}
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TEST(Backtrace, ExceedsStorableLength) {
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gwp_asan::AllocationMetadata Meta;
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Meta.AllocationTrace.RecordBacktrace(
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[](uintptr_t *TraceBuffer, size_t Size) -> size_t {
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// Need to inintialise the elements that will be packed.
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memset(TraceBuffer, 0u, Size * sizeof(*TraceBuffer));
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// Indicate that there were more frames, and we just didn't have enough
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// room to store them.
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return Size * 2;
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});
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// Retrieve a frame from the collected backtrace, make sure it works E2E.
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uintptr_t TraceOutput;
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EXPECT_EQ(gwp_asan::AllocationMetadata::kMaxTraceLengthToCollect,
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__gwp_asan_get_allocation_trace(&Meta, &TraceOutput, 1));
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}
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TEST(Backtrace, ExceedsRetrievableAllocLength) {
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gwp_asan::AllocationMetadata Meta;
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constexpr size_t kNumFramesToStore = 3u;
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Meta.AllocationTrace.RecordBacktrace(
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[](uintptr_t *TraceBuffer, size_t /* Size */) -> size_t {
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memset(TraceBuffer, kNumFramesToStore,
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kNumFramesToStore * sizeof(*TraceBuffer));
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return kNumFramesToStore;
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});
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uintptr_t TraceOutput;
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// Ask for one element, get told that there's `kNumFramesToStore` available.
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EXPECT_EQ(kNumFramesToStore,
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__gwp_asan_get_allocation_trace(&Meta, &TraceOutput, 1));
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}
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TEST(Backtrace, ExceedsRetrievableDeallocLength) {
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gwp_asan::AllocationMetadata Meta;
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constexpr size_t kNumFramesToStore = 3u;
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Meta.DeallocationTrace.RecordBacktrace(
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[](uintptr_t *TraceBuffer, size_t /* Size */) -> size_t {
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memset(TraceBuffer, kNumFramesToStore,
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kNumFramesToStore * sizeof(*TraceBuffer));
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return kNumFramesToStore;
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});
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uintptr_t TraceOutput;
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// Ask for one element, get told that there's `kNumFramesToStore` available.
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EXPECT_EQ(kNumFramesToStore,
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__gwp_asan_get_deallocation_trace(&Meta, &TraceOutput, 1));
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}
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