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Allow for easy reproducable builds with afl++ (#6889) 

* update afl++ commit id

* update afl++ commit id

* fix for afl++

* attempt fix for curl

* allow easy reproducable afl++ builds
This commit is contained in:
van Hauser 2021-11-30 14:13:58 +01:00 committed by GitHub
parent bb1bb30db1
commit cfa0a24958
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1 changed files with 55 additions and 42 deletions
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97
infra/base-images/base-builder/compile_afl
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@ -15,20 +15,10 @@
#
################################################################################
# afl++ configuration options.
# The 'env|grep' setup ensures we do not trigger the linter.
# The variables need to be set to "1" here - or before running this script.
# AFL++ setup
echo "Copying precompiled AFL++"
# AFL++ settings.
export AFL_LLVM_MODE_WORKAROUND=0
export AFL_ENABLE_DICTIONARY=0
export AFL_ENABLE_CMPLOG=1
export AFL_LAF_CHANCE=3
# Start compiling afl++.
echo "Copying precompiled afl++"
# Copy afl++ tools necessary for fuzzing.
# Copy AFL++ tools necessary for fuzzing.
pushd $SRC/aflplusplus > /dev/null
cp -f libAFLDriver.a $LIB_FUZZING_ENGINE
@ -39,42 +29,65 @@ ls afl-* *.txt *.a *.o *.so | sort -u | xargs cp -t $OUT
export CC="$SRC/aflplusplus/afl-clang-fast"
export CXX="$SRC/aflplusplus/afl-clang-fast++"
# Set sane afl++ environment defaults:
# Set sane AFL++ environment defaults:
# Be quiet, otherwise this can break some builds.
export AFL_QUIET=1
# No leak errors during builds.
export ASAN_OPTIONS="detect_leaks=0:symbolize=0:detect_odr_violation=0:abort_on_error=1"
# No complain on unknown AFL environment variables
export AFL_IGNORE_UNKNOWN_ENVS=1
# AFL compile option roulette. It is OK if they all happen together.
# To analyze build failures and set specific AFL++ settings, set
# `export AFL_SKIP_OSSFUZZ=1`
# The 'env|grep' setup ensures we do not trigger the linter.
env | egrep -q '^AFL_SKIP_OSSFUZZ=' || {
# 20% chance for CTX-2 coverage instrumentation (Caller conTeXt sensitive
# edge coverage).
test $(($RANDOM % 100)) -lt 20 && {
export AFL_LLVM_INSTRUMENT=CLASSIC,CTX-2
export AFL_ENABLE_CMPLOG=0
export AFL_LAF_CHANCE=30
}
# The variables need to be set to "1" here - or before running this script.
# AFL++ configuration options.
export AFL_LLVM_MODE_WORKAROUND=0
export AFL_ENABLE_DICTIONARY=0
export AFL_ENABLE_CMPLOG=1
export AFL_LAF_CHANCE=5
# 40% chance to create a dictionary.
test $(($RANDOM % 100)) -lt 40 && {
export AFL_ENABLE_DICTIONARY=1
}
#
# AFL++ compile option roulette. It is OK if they all happen together.
#
# 60% chance to perform CMPLOG/REDQUEEN.
rm -f "$OUT/afl_cmplog.txt"
test "$AFL_ENABLE_CMPLOG" = "1" -a $(($RANDOM % 100)) -lt 60 && {
export AFL_LLVM_CMPLOG=1
touch "$OUT/afl_cmplog.txt"
}
# 20% chance for CTX-2 coverage instrumentation (Caller conTeXt sensitive
# edge coverage).
test $(($RANDOM % 100)) -lt 20 && {
export AFL_LLVM_INSTRUMENT=CLASSIC,CTX-2
export AFL_ENABLE_CMPLOG=0
# we increase the chance for LAF because we do not do CMPLOG with CTX
export AFL_LAF_CHANCE=30
}
# 3% chance to perform COMPCOV/LAF_INTEL.
test $(($RANDOM % 100)) -lt $AFL_LAF_CHANCE && {
export AFL_LLVM_LAF_ALL=1
}
# 40% chance to create a dictionary.
test $(($RANDOM % 100)) -lt 40 && {
export AFL_ENABLE_DICTIONARY=1
}
# 60% chance to perform CMPLOG/REDQUEEN.
rm -f "$OUT/afl_cmplog.txt"
test "$AFL_ENABLE_CMPLOG" = "1" -a $(($RANDOM % 100)) -lt 60 && {
export AFL_LLVM_CMPLOG=1
touch "$OUT/afl_cmplog.txt"
}
# chance to perform COMPCOV/LAF_INTEL - if CMPLOG is not enabled.
test $(($RANDOM % 100)) -lt $AFL_LAF_CHANCE -a "$AFL_ENABLE_CMPLOG" = "0" && {
export AFL_LLVM_LAF_ALL=1
}
#
# End of AFL++ compile option roulette
#
# Create a dictionary if one is wanted.
test "$AFL_ENABLE_DICTIONARY" = "1" && {
export AFL_LLVM_DICT2FILE="$OUT/afl++.dict"
}
# Create a dictionary if one is wanted.
test "$AFL_ENABLE_DICTIONARY" = "1" && {
export AFL_LLVM_DICT2FILE="$OUT/afl++.dict"
}
# In case afl-clang-fast ever breaks, this is a workaround:
@ -96,10 +109,10 @@ test "$AFL_LLVM_MODE_WORKAROUND" = "1" && {
cp -f libAFLDrivernew.a $LIB_FUZZING_ENGINE
}
# Provide a way to document the afl++ options used in this build:
# Provide a way to document the AFL++ options used in this build:
echo
echo afl++ target compilation setup:
env | grep AFL_ | tee "$OUT/afl_options.txt"
echo AFL++ target compilation setup:
env | egrep '^AFL_' | tee "$OUT/afl_options.txt"
echo
popd > /dev/null