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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
42 lines
1.3 KiB
C++
42 lines
1.3 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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// This test computes a checksum of the data (all but the last 4 bytes),
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// and then compares the last 4 bytes with the computed value.
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// A fuzzer with cmp traces is expected to defeat this check.
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#include <cstdint>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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// A modified jenkins_one_at_a_time_hash initialized by non-zero,
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// so that simple_hash(0) != 0. See also
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// https://en.wikipedia.org/wiki/Jenkins_hash_function
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static uint32_t simple_hash(const uint8_t *Data, size_t Size) {
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uint32_t Hash = 0x12039854;
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for (uint32_t i = 0; i < Size; i++) {
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Hash += Data[i];
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Hash += (Hash << 10);
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Hash ^= (Hash >> 6);
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}
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Hash += (Hash << 3);
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Hash ^= (Hash >> 11);
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Hash += (Hash << 15);
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return Hash;
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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if (Size < 14)
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return 0;
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uint32_t Hash = simple_hash(&Data[0], Size - 4);
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uint32_t Want = reinterpret_cast<const uint32_t *>(&Data[Size - 4])[0];
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if (Hash != Want)
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return 0;
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fprintf(stderr, "BINGO; simple_hash defeated: %x == %x\n", (unsigned int)Hash,
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(unsigned int)Want);
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exit(1);
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return 0;
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}
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