forked from OSchip/llvm-project
37 lines
1.4 KiB
C++
37 lines
1.4 KiB
C++
// 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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// Tests whether scaling the Entropic scheduling weight based on input execution
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// time is effective or not. Inputs of size 10 will take at least 100
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// microseconds more than any input of size 1-9. The input of size 2 in the
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// corpus should be favored by the exec-time-scaled Entropic scheduling policy
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// than the input of size 10 in the corpus, eventually finding the crashing
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// input {0xab, 0xcd} with less executions.
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#include <chrono>
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#include <cstdint>
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#include <thread>
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static volatile int Sink;
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static volatile int *Nil = nullptr;
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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if (Size > 10)
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return 0; // To make the test quicker.
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if (Size != 2) {
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// execute a lot slower than the crashing input below.
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size_t ExecTimeUSec = 100;
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std::this_thread::sleep_for(std::chrono::microseconds(ExecTimeUSec));
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if (Size > 0 && Data[0] == 0xaa && Size > 1 && Data[1] == 0xbb &&
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Size > 2 && Data[2] == 0xcc && Size > 3 && Data[3] == 0xdd &&
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Size > 4 && Data[4] == 0xee && Size > 5 && Data[5] == 0xff)
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Sink += 7;
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}
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if (Size == 2 && Data[0] == 0xab && Data[1] == 0xcd)
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*Nil = 42; // crash.
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return 0;
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}
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