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#!/usr/bin/env sh
#
# honggfuzz stackhash blocklist file create script
# -----------------------------------------
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
set -e # fail on unhandled error
set -u # fail on undefined variable
#set -x # debug
readonly tmpFile=$(pwd)/.hf.bl.txt
declare -a sysTools=("perl" "cut" "sort" "paste" "wc" "tr" "cat")
usage() {
cat <<_EOF
Usage: $(basename $0) [options]
OPTIONS:
-i|--input : input crash(es) directory / file
-B|--bl-file : output file to save found hashes (merge if exists)
-e|--ext : file extension of fuzzer files (e.g. fuzz)
-a|--arch : arch fuzzer have run against ('MAC' or 'LINUX')
INFO:
* Blacklist file sort mode only requires [-B/--bl-file] argument
* Hashes gather mode requires all argument to be set
_EOF
exit 1
}
command_exists () {
type "$1" &> /dev/null ;
}
# Check that system tools exist
for i in "${sysTools[@]}"
do
if ! command_exists $i; then
echo "[-] '$i' command not found"
exit 1
fi
done
INPUT_DIR=""
BL_FILE=""
FILE_EXT=""
ARCH=""
nArgs=$#
while [[ $# > 1 ]]
do
arg="$1"
case $arg in
-i|--input)
INPUT_DIR="$2"
shift
;;
-B|--bl-file)
BL_FILE="$2"
shift
;;
-e|--ext)
FILE_EXT="$2"
shift
;;
-a|--arch)
ARCH="$2"
shift
;;
*)
echo "[-] Invalid argument '$1'"
usage
;;
esac
shift
done
gatherMode=false
# Sort only mode
if [[ "$BL_FILE" == "" ]]; then
echo "[-] Missing blocklist file"
usage
fi
# Hashes gather mode
if [ $nArgs -gt 2 ]; then
if [[ "$INPUT_DIR" == "" || ! -e "$INPUT_DIR" ]]; then
echo "[-] Missing or invalid input directory"
usage
fi
if [[ "$FILE_EXT" == "" ]]; then
echo "[-] Missing file extension"
usage
fi
if [[ "$ARCH" != "MAC" && "$ARCH" != "LINUX" ]]; then
echo "[-] Invalid architecture, expecting 'MAC' or 'LINUX'"
usage
fi
if [[ "$ARCH" == "LINUX" ]]; then
STACKHASH_FIELD=5
elif [[ "$ARCH" == "MAC" ]]; then
STACKHASH_FIELD=6
else
echo "[-] Unsupported architecture"
exit 1
fi
gatherMode=true
fi
# save old data
if [ -f $BL_FILE ]; then
cat $BL_FILE > $tmpFile
oldCount=$(cat $BL_FILE | wc -l | tr -d " ")
else
oldCount=0
fi
if $gatherMode; then
echo "[*] Processing files from '$INPUT_DIR' ..."
find $INPUT_DIR -type f -iname "*.$FILE_EXT" | while read -r FILE
do
fileName=$(basename $FILE)
if ! echo $fileName | grep -qF ".STACK."; then
echo "[!] Skipping '$FILE'"
continue
fi
stackHash=$(echo $fileName | cut -d '.' -f$STACKHASH_FIELD)
# We don't want to lose crashes where unwinder failed
if [[ "$stackHash" != "0" && ! "$stackHash" =~ ^badbad.* ]]; then
echo $stackHash >> $tmpFile
fi
done
fi
# sort hex values
echo "[*] Sorting blocklist file entries"
perl -lpe '$_=hex' $tmpFile | \
paste -d" " - $tmpFile | sort -nu | cut -d" " -f 2- \
> $BL_FILE
entries=$(cat $BL_FILE | wc -l | tr -d " ")
echo "[*] $BL_FILE contains $entries blocklisted stack hashes"
rm $tmpFile
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