| 1 | #!/bin/bash |
| 2 | progname="${0##*/}" |
| 3 | progname="${progname%.sh}" |
| 4 | |
| 5 | # usage: check_elf_alignment.sh [path to *.so files|path to *.apk] |
| 6 | |
| 7 | cleanup_trap() { |
| 8 | if [ -n "${tmp}" -a -d "${tmp}" ]; then |
| 9 | rm -rf ${tmp} |
| 10 | fi |
| 11 | exit $1 |
| 12 | } |
| 13 | |
| 14 | usage() { |
| 15 | echo "Host side script to check the ELF alignment of shared libraries." |
| 16 | echo "Shared libraries are reported ALIGNED when their ELF regions are" |
| 17 | echo "16 KB or 64 KB aligned. Otherwise they are reported as UNALIGNED." |
| 18 | echo |
| 19 | echo "Usage: ${progname} [input-path|input-APK|input-APEX]" |
| 20 | } |
| 21 | |
| 22 | if [ ${#} -ne 1 ]; then |
| 23 | cd $(dirname $0)/../.. |
| 24 | usage |
| 25 | cd build/app/outputs/flutter-apk |
| 26 | bash ../../../../scripts/android/check_16kb_align.sh app-release.apk |
| 27 | exit |
| 28 | fi |
| 29 | |
| 30 | case ${1} in |
| 31 | --help | -h | -\?) |
| 32 | usage |
| 33 | exit |
| 34 | ;; |
| 35 | |
| 36 | *) |
| 37 | dir="${1}" |
| 38 | ;; |
| 39 | esac |
| 40 | |
| 41 | if ! [ -f "${dir}" -o -d "${dir}" ]; then |
| 42 | echo "Invalid file: ${dir}" >&2 |
| 43 | exit 1 |
| 44 | fi |
| 45 | |
| 46 | if [[ "${dir}" == *.apk ]]; then |
| 47 | trap 'cleanup_trap' EXIT |
| 48 | |
| 49 | echo |
| 50 | echo "Recursively analyzing $dir" |
| 51 | echo |
| 52 | |
| 53 | if { zipalign --help 2>&1 | grep -q "\-P <pagesize_kb>"; }; then |
| 54 | echo "=== APK zip-alignment ===" |
| 55 | zipalign -v -c -P 16 4 "${dir}" | egrep 'lib/arm64-v8a|lib/x86_64|Verification' |
| 56 | echo "=========================" |
| 57 | else |
| 58 | echo "NOTICE: Zip alignment check requires build-tools version 35.0.0-rc3 or higher." |
| 59 | echo " You can install the latest build-tools by running the below command" |
| 60 | echo " and updating your \$PATH:" |
| 61 | echo |
| 62 | echo " sdkmanager \"build-tools;35.0.0-rc3\"" |
| 63 | fi |
| 64 | |
| 65 | dir_filename=$(basename "${dir}") |
| 66 | tmp=$(mktemp -d -t "${dir_filename%.apk}_out_XXXXX") |
| 67 | unzip "${dir}" lib/* -d "${tmp}" >/dev/null 2>&1 |
| 68 | dir="${tmp}" |
| 69 | fi |
| 70 | |
| 71 | if [[ "${dir}" == *.apex ]]; then |
| 72 | trap 'cleanup_trap' EXIT |
| 73 | |
| 74 | echo |
| 75 | echo "Recursively analyzing $dir" |
| 76 | echo |
| 77 | |
| 78 | dir_filename=$(basename "${dir}") |
| 79 | tmp=$(mktemp -d -t "${dir_filename%.apex}_out_XXXXX") |
| 80 | deapexer extract "${dir}" "${tmp}" || { echo "Failed to deapex." && exit 1; } |
| 81 | dir="${tmp}" |
| 82 | fi |
| 83 | |
| 84 | RED="\e[31m" |
| 85 | GREEN="\e[32m" |
| 86 | ENDCOLOR="\e[0m" |
| 87 | |
| 88 | unaligned_libs=() |
| 89 | |
| 90 | echo |
| 91 | echo "=== ELF alignment ===" |
| 92 | |
| 93 | matches="$(find "${dir}" -type f | grep -E '/(arm64-v8a|x86_64)/')" |
| 94 | IFS=$'\n' |
| 95 | for match in $matches; do |
| 96 | # We could recursively call this script or rewrite it to though. |
| 97 | [[ "${match}" == *".apk" ]] && echo "WARNING: doesn't recursively inspect .apk file: ${match}" |
| 98 | [[ "${match}" == *".apex" ]] && echo "WARNING: doesn't recursively inspect .apex file: ${match}" |
| 99 | |
| 100 | [[ $(file "${match}") == *"ELF"* ]] || continue |
| 101 | |
| 102 | res="$(objdump -p "${match}" | grep LOAD | awk '{ print $NF }' | head -1)" |
| 103 | if [[ $res =~ 2\*\*(1[4-9]|[2-9][0-9]|[1-9][0-9]{2,}) ]]; then |
| 104 | echo -e "${match}: ${GREEN}ALIGNED${ENDCOLOR} ($res)" |
| 105 | else |
| 106 | echo -e "${match}: ${RED}UNALIGNED${ENDCOLOR} ($res)" |
| 107 | unaligned_libs+=("${match}") |
| 108 | fi |
| 109 | done |
| 110 | |
| 111 | if [ ${#unaligned_libs[@]} -gt 0 ]; then |
| 112 | echo -e "${RED}Found ${#unaligned_libs[@]} unaligned libs (only arm64-v8a/x86_64 libs need to be aligned).${ENDCOLOR}" |
| 113 | exit ${#unaligned_libs[@]} |
| 114 | elif [ -n "${dir_filename}" ]; then |
| 115 | echo -e "ELF Verification Successful" |
| 116 | fi |
| 117 | echo "=====================" |