diff options
author | Dimitry Andric <dim@FreeBSD.org> | 2019-08-20 18:00:15 +0000 |
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committer | Dimitry Andric <dim@FreeBSD.org> | 2019-08-20 18:00:15 +0000 |
commit | 63714eb5809e39666dec2454c354195e76f916ba (patch) | |
tree | e3714cd783c265396c2ef3c117047e7c0ea41619 /test/fuzzer/SimpleHashTest.cpp | |
parent | 0646903fc1f75f6e605754621119473ee083f4a4 (diff) |
Notes
Diffstat (limited to 'test/fuzzer/SimpleHashTest.cpp')
-rw-r--r-- | test/fuzzer/SimpleHashTest.cpp | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/test/fuzzer/SimpleHashTest.cpp b/test/fuzzer/SimpleHashTest.cpp deleted file mode 100644 index 99e96cb25dcd5..0000000000000 --- a/test/fuzzer/SimpleHashTest.cpp +++ /dev/null @@ -1,40 +0,0 @@ -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. - -// This test computes a checksum of the data (all but the last 4 bytes), -// and then compares the last 4 bytes with the computed value. -// A fuzzer with cmp traces is expected to defeat this check. -#include <cstdint> -#include <cstdio> -#include <cstdlib> -#include <cstring> - -// A modified jenkins_one_at_a_time_hash initialized by non-zero, -// so that simple_hash(0) != 0. See also -// https://en.wikipedia.org/wiki/Jenkins_hash_function -static uint32_t simple_hash(const uint8_t *Data, size_t Size) { - uint32_t Hash = 0x12039854; - for (uint32_t i = 0; i < Size; i++) { - Hash += Data[i]; - Hash += (Hash << 10); - Hash ^= (Hash >> 6); - } - Hash += (Hash << 3); - Hash ^= (Hash >> 11); - Hash += (Hash << 15); - return Hash; -} - -extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { - if (Size < 14) - return 0; - - uint32_t Hash = simple_hash(&Data[0], Size - 4); - uint32_t Want = reinterpret_cast<const uint32_t *>(&Data[Size - 4])[0]; - if (Hash != Want) - return 0; - fprintf(stderr, "BINGO; simple_hash defeated: %x == %x\n", (unsigned int)Hash, - (unsigned int)Want); - exit(1); - return 0; -} |