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Use binary write mode in WriteToFile function to avoid appended \r ch…
…aracters on Windows Summary: When using libfuzzer on Windows, in the contents of a crash sample, bytes that can be mistaken for a \n are replaced by a \r\n sequence. As a consequence, crashes are not reproducible. This patch will open files in binary mode to fix this issue. The patch does not affect POSIX systems. Patch by tuktuk Reviewers: kcc, vitalybuka Reviewed By: vitalybuka Subscribers: dexonsmith, jdoerfert, llvm-commits, #sanitizers Tags: #llvm, #sanitizers Differential Revision: https://reviews.llvm.org/D60008 llvm-svn: 357807
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
// See https://llvm.org/LICENSE.txt for license information. | ||
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
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// Test that fuzzer we can reload artifacts with any bytes inside. | ||
#include <algorithm> | ||
#include <cstdint> | ||
#include <numeric> | ||
#include <set> | ||
#include <stdio.h> | ||
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extern "C" size_t LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size, | ||
size_t MaxSize, unsigned int Seed) { | ||
std::srand(Seed); | ||
std::generate(Data, Data + MaxSize, std::rand); | ||
return MaxSize; | ||
} | ||
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { | ||
if (Size > 5000 && std::set<uint8_t>(Data, Data + Size).size() > 255 && | ||
(uint8_t)std::accumulate(Data, Data + Size, uint8_t(Size)) == 0) | ||
__builtin_trap(); | ||
return 0; | ||
} |
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RUN: %cpp_compiler %S/ReloadTest.cpp -o %t-ReloadTest | ||
RUN: not %run %t-ReloadTest -max_len=10000 -seed=1 -timeout=15 -len_control=0 -exact_artifact_path=%t.crash 2>&1 | FileCheck %s | ||
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CHECK: Test unit written to {{.*}}reload.test.tmp.crash | ||
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RUN: not %run %t-ReloadTest %t.crash 2>&1 | FileCheck %s --check-prefix=ARTIFACT | ||
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ARTIFACT: Running: {{.*}}reload.test.tmp.crash | ||
ARTIFACT: ERROR: libFuzzer: deadly signal | ||
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# Sanity check that altered artifact is not going to crash | ||
RUN: echo z >> %t.crash | ||
RUN: %run %t-ReloadTest %t.crash |