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-exception
4
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 when
18// libFuzzer finds this function. We use a macro to make the name as long
19// possible, hoping to increase the time spent in symbolization and increase the
20// 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