36 lines · cpp
1// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.2// See https://llvm.org/LICENSE.txt for license information.3// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception4 5// Tests that deadlocks do not occur when an OOM occurs during symbolization.6 7#include <cassert>8#include <cstdint>9#include <cstdio>10#include <cstdlib>11#include <cstring>12 13#include "Bingo.h"14 15volatile unsigned Sink = 0;16 17// Do not inline this function. We want to trigger NEW_FUNC symbolization when18// libFuzzer finds this function. We use a macro to make the name as long19// possible, hoping to increase the time spent in symbolization and increase the20// chances of triggering a deadlock.21__attribute__((noinline)) void BINGO() {22 // Busy work. Inserts a delay here so the deadlock is more likely to trigger.23 for (unsigned i = 0; i < 330000000; i++) Sink += i;24}25 26extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {27 assert(Data);28 if (Size < 3) return 0;29 if (Data[0] == 'F' &&30 Data[1] == 'U' &&31 Data[2] == 'Z')32 BINGO();33 return 0;34}35 36