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#!/bin/bash
progname="${0##*/}"
progname="${progname%.sh}"
# usage: check_elf_alignment.sh [path to *.so files|path to *.apk]
cleanup_trap() {
if [ -n "${tmp}" -a -d "${tmp}" ]; then
rm -rf ${tmp}
fi
exit $1
}
usage() {
echo "Host side script to check the ELF alignment of shared libraries."
echo "Shared libraries are reported ALIGNED when their ELF regions are"
echo "16 KB or 64 KB aligned. Otherwise they are reported as UNALIGNED."
echo
echo "Usage: ${progname} [input-path|input-APK]"
}
if [ ${#} -ne 1 ]; then
usage
exit
fi
case ${1} in
--help | -h | -\?)
usage
exit
;;
*)
dir="${1}"
;;
esac
if ! [ -f "${dir}" -o -d "${dir}" ]; then
echo "Invalid file: ${dir}" >&2
exit 1
fi
if [[ "${dir}" == *.apk ]]; then
trap 'cleanup_trap' EXIT
if { zipalign --help 2>&1 | grep -q "\-P <pagesize_kb>"; }; then
echo "=== APK zip-alignment ==="
zipalign -v -c -P 16 4 "${dir}" | egrep 'lib/arm64-v8a|lib/x86_64|Verification'
echo "========================="
else
echo "NOTICE: Zip alignment check requires build-tools version 35.0.0-rc3 or higher."
echo " You can install the latest build-tools by running the below command"
echo " and updating your \$PATH:"
echo
echo " sdkmanager \"build-tools;35.0.0-rc3\""
fi
dir_filename=$(basename "${dir}")
tmp=$(mktemp -d -t "${dir_filename%.apk}_out_XXXXX")
unzip "${dir}" lib/* -d "${tmp}" >/dev/null 2>&1
dir="${tmp}"
fi
RED="\e[31m"
GREEN="\e[32m"
ENDCOLOR="\e[0m"
unaligned_libs=()
echo
echo "=== ELF alignment ==="
matches="$(find "${dir}" -name "*.so" -type f)"
IFS=$'\n'
for match in $matches; do
res="$(objdump -p ${match} | grep LOAD | awk '{ print $NF }' | head -1)"
if [[ $res =~ "2**14" ]] || [[ $res =~ "2**16" ]]; then
echo -e "${match}: ${GREEN}ALIGNED${ENDCOLOR} ($res)"
else
echo -e "${match}: ${RED}UNALIGNED${ENDCOLOR} ($res)"
unaligned_libs+=("${match}")
fi
done
if [ ${#unaligned_libs[@]} -gt 0 ]; then
echo -e "${RED}Found ${#unaligned_libs[@]} unaligned libs (only arm64-v8a/x86_64 libs need to be aligned).${ENDCOLOR}"
elif [ -n "${dir_filename}" ]; then
echo -e "ELF Verification Successful"
fi
echo "====================="
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