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