108 lines
3.3 KiB
Bash
108 lines
3.3 KiB
Bash
#!/bin/bash -eu
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# Copyright 2016 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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################################################################################
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# afl++ configuration options.
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# The 'env|grep' setup ensures we do not trigger the linter.
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# The variables need to be set to "1" here - or before running this script.
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# AFL++ settings.
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export AFL_LLVM_MODE_WORKAROUND=0
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export AFL_ENABLE_DICTIONARY=0
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export AFL_ENABLE_CMPLOG=1
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export AFL_LAF_CHANCE=3
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# Start compiling afl++.
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echo "Copying precompiled afl++"
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# Copy afl++ tools necessary for fuzzing.
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pushd $SRC/aflplusplus > /dev/null
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cp -f libAFLDriver.a $LIB_FUZZING_ENGINE
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# Some important projects include libraries, copy those even when they don't
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# start with "afl-". Use "sort -u" to avoid a warning about duplicates.
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ls afl-* *.txt *.a *.o *.so | sort -u | xargs cp -t $OUT
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export CC="$SRC/aflplusplus/afl-clang-fast"
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export CXX="$SRC/aflplusplus/afl-clang-fast++"
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# Set sane afl++ environment defaults:
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# Be quiet, otherwise this can break some builds.
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export AFL_QUIET=1
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# No leak errors during builds.
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export ASAN_OPTIONS="detect_leaks=0:symbolize=0:detect_odr_violation=0:abort_on_error=1"
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# AFL compile option roulette. It is OK if they all happen together.
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# 20% chance for CTX-2 coverage instrumentation (Caller conTeXt sensitive
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# edge coverage).
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test $(($RANDOM % 100)) -lt 20 && {
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export AFL_LLVM_INSTRUMENT=CLASSIC,CTX-2
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export AFL_ENABLE_CMPLOG=0
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export AFL_LAF_CHANCE=30
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}
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# 40% chance to create a dictionary.
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test $(($RANDOM % 100)) -lt 40 && {
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export AFL_ENABLE_DICTIONARY=1
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}
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# 60% chance to perform CMPLOG/REDQUEEN.
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rm -f "$OUT/afl_cmplog.txt"
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test "$AFL_ENABLE_CMPLOG" = "1" -a $(($RANDOM % 100)) -lt 60 && {
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export AFL_LLVM_CMPLOG=1
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touch "$OUT/afl_cmplog.txt"
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}
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# 3% chance to perform COMPCOV/LAF_INTEL.
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test $(($RANDOM % 100)) -lt $AFL_LAF_CHANCE && {
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export AFL_LLVM_LAF_ALL=1
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}
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# Create a dictionary if one is wanted.
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test "$AFL_ENABLE_DICTIONARY" = "1" && {
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export AFL_LLVM_DICT2FILE="$OUT/afl++.dict"
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}
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# In case afl-clang-fast ever breaks, this is a workaround:
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test "$AFL_LLVM_MODE_WORKAROUND" = "1" && {
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export CC=clang
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export CXX=clang++
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WORKAROUND_FLAGS=-fsanitize-coverage=trace-pc-guard
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# We can still do CMPLOG light:
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test -e "$OUT/afl_cmplog.txt" && {
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WORKAROUND_FLAGS="$WORKAROUND_FLAGS",trace-cmp
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}
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export CFLAGS="$CFLAGS $WORKAROUND_FLAGS"
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export CXXFLAGS="$CXXFLAGS $WORKAROUND_FLAGS"
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unset AFL_LLVM_LAF_ALL
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unset AFL_LLVM_DICT2FILE
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unset AFL_ENABLE_DICTIONARY
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# We need to create a new fuzzer lib however.
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ar ru libAFLDrivernew.a afl-compiler-rt.o utils/aflpp_driver/aflpp_driver.o
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cp -f libAFLDrivernew.a $LIB_FUZZING_ENGINE
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}
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# Provide a way to document the afl++ options used in this build:
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echo
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echo afl++ target compilation setup:
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env | grep AFL_ | tee "$OUT/afl_options.txt"
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echo
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popd > /dev/null
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echo " done."
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