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authorDimitry Andric <dim@FreeBSD.org>2019-08-20 18:00:15 +0000
committerDimitry Andric <dim@FreeBSD.org>2019-08-20 18:00:15 +0000
commit63714eb5809e39666dec2454c354195e76f916ba (patch)
treee3714cd783c265396c2ef3c117047e7c0ea41619 /test/fuzzer/SimpleHashTest.cpp
parent0646903fc1f75f6e605754621119473ee083f4a4 (diff)
Notes
Diffstat (limited to 'test/fuzzer/SimpleHashTest.cpp')
-rw-r--r--test/fuzzer/SimpleHashTest.cpp40
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;
-}