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128 lines
3.3 KiB
Bash
Executable File
128 lines
3.3 KiB
Bash
Executable File
#!/bin/bash
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progname="${0##*/}"
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progname="${progname%.sh}"
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# usage: check_elf_alignment.sh [path to *.so files|path to *.apk]
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cleanup_trap() {
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if [ -n "${tmp}" -a -d "${tmp}" ]; then
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rm -rf ${tmp}
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fi
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exit $1
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}
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usage() {
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echo "Host side script to check the ELF alignment of shared libraries."
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echo "Shared libraries are reported ALIGNED when their ELF regions are"
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echo "16 KB or 64 KB aligned. Otherwise they are reported as UNALIGNED."
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echo
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echo "Usage: ${progname} [input-path|input-APK|input-APEX]"
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}
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if [ ${#} -ne 1 ]; then
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usage
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exit
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fi
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case ${1} in
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--help | -h | -\?)
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usage
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exit
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;;
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*)
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dir="${1}"
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;;
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esac
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if ! [ -f "${dir}" -o -d "${dir}" ]; then
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echo "Invalid file: ${dir}" >&2
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exit 1
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fi
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if [[ "${dir}" == *.apk ]]; then
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trap 'cleanup_trap' EXIT
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echo
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echo "Recursively analyzing $dir"
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echo
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if { zipalign --help 2>&1 | grep -q "\-P <pagesize_kb>"; }; then
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echo "=== APK zip-alignment ==="
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zipalign -v -c -P 16 4 "${dir}" | egrep 'lib/arm64-v8a|lib/x86_64|Verification'
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echo "========================="
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else
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echo "NOTICE: Zip alignment check requires build-tools version 35.0.0-rc3 or higher."
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echo " You can install the latest build-tools by running the below command"
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echo " and updating your \$PATH:"
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echo
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echo " sdkmanager \"build-tools;35.0.0-rc3\""
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fi
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dir_filename=$(basename "${dir}")
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tmp=$(mktemp -d -t "${dir_filename%.apk}_out_XXXXX")
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unzip "${dir}" lib/* -d "${tmp}" >/dev/null 2>&1
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dir="${tmp}"
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fi
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if [[ "${dir}" == *.apex ]]; then
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trap 'cleanup_trap' EXIT
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echo
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echo "Recursively analyzing $dir"
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echo
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dir_filename=$(basename "${dir}")
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tmp=$(mktemp -d -t "${dir_filename%.apex}_out_XXXXX")
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deapexer extract "${dir}" "${tmp}" || { echo "Failed to deapex." && exit 1; }
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dir="${tmp}"
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fi
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RED="\e[31m"
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GREEN="\e[32m"
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ENDCOLOR="\e[0m"
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unaligned_libs=()
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unaligned_critical_libs=()
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echo
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echo "=== ELF alignment ==="
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matches="$(find "${dir}" -type f)"
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IFS=$'\n'
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for match in $matches; do
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# We could recursively call this script or rewrite it to though.
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[[ "${match}" == *".apk" ]] && echo "WARNING: doesn't recursively inspect .apk file: ${match}"
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[[ "${match}" == *".apex" ]] && echo "WARNING: doesn't recursively inspect .apex file: ${match}"
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[[ $(file "${match}") == *"ELF"* ]] || continue
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res="$(objdump -p "${match}" | grep LOAD | awk '{ print $NF }' | head -1)"
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if [[ $res =~ 2\*\*(1[4-9]|[2-9][0-9]|[1-9][0-9]{2,}) ]]; then
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echo -e "${match}: ${GREEN}ALIGNED${ENDCOLOR} ($res)"
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else
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unaligned_libs+=("${match}")
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# Check if this is a critical architecture (arm64-v8a or x86_64)
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if [[ "${match}" == *"arm64-v8a"* ]] || [[ "${match}" == *"x86_64"* ]]; then
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unaligned_critical_libs+=("${match}")
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echo -e "${match}: ${RED}UNALIGNED${ENDCOLOR} ($res)"
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else
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echo -e "${match}: UNALIGNED ($res)"
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fi
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fi
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done
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if [ ${#unaligned_libs[@]} -gt 0 ]; then
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echo -e "Found ${#unaligned_libs[@]} unaligned libs (only arm64-v8a/x86_64 libs need to be aligned).${ENDCOLOR}"
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fi
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echo "====================="
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# Exit with appropriate code: 1 if critical unaligned libs found, 0 otherwise
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if [ ${#unaligned_critical_libs[@]} -gt 0 ]; then
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echo -e "${RED}Found ${#unaligned_critical_libs[@]} critical unaligned libs.${ENDCOLOR}"
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exit 1
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else
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echo -e "${GREEN}ELF Verification Successful${ENDCOLOR}"
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exit 0
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fi
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