1#!/bin/bash -eu 2# Copyright 2016 Google Inc. 3# 4# Licensed under the Apache License, Version 2.0 (the "License"); 5# you may not use this file except in compliance with the License. 6# You may obtain a copy of the License at 7# 8# http://www.apache.org/licenses/LICENSE-2.0 9# 10# Unless required by applicable law or agreed to in writing, software 11# distributed under the License is distributed on an "AS IS" BASIS, 12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13# See the License for the specific language governing permissions and 14# limitations under the License. 15# 16################################################################################ 17 18# afl++ configuration options. 19# The 'env|grep' setup ensures we do not trigger the linter. 20# The variables need to be set to "1" here - or before running this script. 21 22# AFL++ settings. 23export AFL_LLVM_MODE_WORKAROUND=0 24export AFL_ENABLE_DICTIONARY=0 25 26# Start compiling afl++. 27echo "Copying precompiled afl++" 28 29# Copy afl++ tools necessary for fuzzing. 30pushd $SRC/aflplusplus > /dev/null 31 32cp -f libAFLDriver.a $LIB_FUZZING_ENGINE 33 34# Some important projects include libraries, copy those even when they don't 35# start with "afl-". Use "sort -u" to avoid a warning about duplicates. 36ls afl-* *.txt *.a *.o *.so | sort -u | xargs cp -t $OUT 37export CC="$SRC/aflplusplus/afl-clang-fast" 38export CXX="$SRC/aflplusplus/afl-clang-fast++" 39 40# Set sane afl++ environment defaults: 41# Be quiet, otherwise this can break some builds. 42export AFL_QUIET=1 43# No leak errors during builds. 44export ASAN_OPTIONS="detect_leaks=0:symbolize=0:detect_odr_violation=0:abort_on_error=1" 45 46# AFL compile option roulette. It is OK if they all happen together. 47 48# 40% chance to perform CMPLOG 49rm -f "$OUT/afl_cmplog.txt" 50test $(($RANDOM % 10)) -lt 4 && { 51 export AFL_LLVM_CMPLOG=1 52 touch "$OUT/afl_cmplog.txt" 53} 54 55# 10% chance to perform LAF_INTEL 56test $(($RANDOM % 10)) -lt 1 && { 57 export AFL_LLVM_LAF_ALL=1 58} 59 60# If the targets wants a dictionary - then create one. 61test "$AFL_ENABLE_DICTIONARY" = "1" && { 62 export AFL_LLVM_DICT2FILE="$OUT/afl++.dict" 63} 64 65# In case afl-clang-fast ever breaks, this is a workaround: 66test "$AFL_LLVM_MODE_WORKAROUND" = "1" && { 67 export CC=clang 68 export CXX=clang++ 69 WORKAROUND_FLAGS=-fsanitize-coverage=trace-pc-guard 70 # We can still do CMPLOG light: 71 test -e "$OUT/afl_cmplog.txt" && { 72 WORKAROUND_FLAGS="$WORKAROUND_FLAGS",trace-cmp 73 } 74 export CFLAGS="$CFLAGS $WORKAROUND_FLAGS" 75 export CXXFLAGS="$CXXFLAGS $WORKAROUND_FLAGS" 76 unset AFL_LLVM_LAF_ALL 77 unset AFL_LLVM_DICT2FILE 78 unset AFL_ENABLE_DICTIONARY 79 # We need to create a new fuzzer lib however. 80 ar ru libAFLDrivernew.a afl-compiler-rt.o utils/aflpp_driver/aflpp_driver.o 81 cp -f libAFLDrivernew.a $LIB_FUZZING_ENGINE 82} 83 84# Provide a way to document the afl++ options used in this build: 85echo 86echo afl++ target compilation setup: 87env | grep AFL_ | tee "$OUT/afl_options.txt" 88echo 89 90popd > /dev/null 91 92echo " done." 93