llvm-project/compiler-rt/test/fuzzer/ShallowOOMDeepCrash.cpp

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C++

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Simple test for a fuzzer.
// Here the target has a shallow OOM bug and a deeper crash.
// Make sure we can find the crash while ignoring OOMs.
#include <cstddef>
#include <cstdint>
static volatile int *Sink;
static volatile int *Zero;
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
if (Size >= 3 && Data[0] == 'O' && Data[1] == 'O' && Data[2] == 'M')
Sink = new int[1 << 28]; // instant OOM with -rss_limit_mb=128.
if (Size >= 4 && Data[0] == 'F' && Data[1] == 'U' && Data[2] == 'Z' &&
Data[3] == 'Z') // a bit deeper crash.
*Zero = 42;
return 0;
}