92 lines
3.5 KiB
Bash
92 lines
3.5 KiB
Bash
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#!/bin/bash
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# Copyright (c) 2012 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE-CHROMIUM file.
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# Usage: make_more_helpers.sh <directory_within_contents> <app_name>
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#
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# This script creates additional helper .app bundles for Chromium, based on
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# the existing helper .app bundle, changing their Mach-O header's flags to
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# enable and disable various features. Based on Chromium Helper.app, it will
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# create Chromium Helper EH.app, which has the MH_NO_HEAP_EXECUTION bit
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# cleared to support Chromium child processes that require an executable heap,
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# and Chromium Helper NP.app, which has the MH_PIE bit cleared to support
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# Chromium child processes that cannot tolerate ASLR.
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#
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# This script expects to be called from the chrome_exe target as a postbuild,
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# and operates directly within the built-up browser app's versioned directory.
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#
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# Each helper is adjusted by giving it the proper bundle name, renaming the
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# executable, adjusting several Info.plist keys, and changing the executable's
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# Mach-O flags.
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set -eu
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make_helper() {
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local containing_dir="${1}"
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local app_name="${2}"
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local feature="${3}"
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local flags="${4}"
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local helper_name="${app_name} Helper"
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local helper_stem="${containing_dir}/${helper_name}"
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local original_helper="${helper_stem}.app"
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if [[ ! -d "${original_helper}" ]]; then
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echo "${0}: error: ${original_helper} is a required directory" >& 2
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exit 1
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fi
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local original_helper_exe="${original_helper}/Contents/MacOS/${helper_name}"
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if [[ ! -f "${original_helper_exe}" ]]; then
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echo "${0}: error: ${original_helper_exe} is a required file" >& 2
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exit 1
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fi
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local feature_helper="${helper_stem} ${feature}.app"
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rsync -acC --delete --include '*.so' "${original_helper}/" "${feature_helper}"
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local helper_feature="${helper_name} ${feature}"
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local helper_feature_exe="${feature_helper}/Contents/MacOS/${helper_feature}"
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mv "${feature_helper}/Contents/MacOS/${helper_name}" "${helper_feature_exe}"
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local change_flags="$(dirname "${0}")/change_mach_o_flags.py"
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"${change_flags}" ${flags} "${helper_feature_exe}"
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local feature_info="${feature_helper}/Contents/Info"
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local feature_info_plist="${feature_info}.plist"
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defaults write "${feature_info}" "CFBundleDisplayName" "${helper_feature}"
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defaults write "${feature_info}" "CFBundleExecutable" "${helper_feature}"
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cfbundleid="$(defaults read "${feature_info}" "CFBundleIdentifier")"
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feature_cfbundleid="${cfbundleid}.${feature}"
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defaults write "${feature_info}" "CFBundleIdentifier" "${feature_cfbundleid}"
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cfbundlename="$(defaults read "${feature_info}" "CFBundleName")"
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feature_cfbundlename="${cfbundlename} ${feature}"
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defaults write "${feature_info}" "CFBundleName" "${feature_cfbundlename}"
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# As usual, defaults might have put the plist into whatever format excites
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# it, but Info.plists get converted back to the expected XML format.
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plutil -convert xml1 "${feature_info_plist}"
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# `defaults` also changes the file permissions, so make the file
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# world-readable again.
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chmod a+r "${feature_info_plist}"
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}
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if [[ ${#} -ne 2 ]]; then
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echo "usage: ${0} <directory_within_contents> <app_name>" >& 2
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exit 1
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fi
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DIRECTORY_WITHIN_CONTENTS="${1}"
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APP_NAME="${2}"
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CONTENTS_DIR="${BUILT_PRODUCTS_DIR}/${CONTENTS_FOLDER_PATH}"
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CONTAINING_DIR="${CONTENTS_DIR}/${DIRECTORY_WITHIN_CONTENTS}"
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make_helper "${CONTAINING_DIR}" "${APP_NAME}" "EH" "--executable-heap"
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make_helper "${CONTAINING_DIR}" "${APP_NAME}" "NP" "--no-pie"
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