compiler-rt/test/fuzzer/ShallowOOMDeepCrash.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-exception
   4
   5 // Simple test for a fuzzer.
   6 // Here the target has a shallow OOM bug and a deeper crash.
   7 // Make sure we can find the crash while ignoring OOMs.
   8 #include <cstddef>
   9 #include <cstdint>
  10
  11 static volatile int *Sink;
  12 static volatile int *Zero;
  13
  14 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  15   if (Size >= 3 && Data[0] == 'O' && Data[1] == 'O' && Data[2] == 'M')
  16     Sink = new int[1 << 28]; // instant OOM with -rss_limit_mb=128.
  17   if (Size >= 4 && Data[0] == 'F' && Data[1] == 'U' && Data[2] == 'Z' &&
  18       Data[3] == 'Z')  // a bit deeper crash.
  19     *Zero = 42;
  20   return 0;
  21 }
  22