1 #!/bin/bash 2 3 # Copyright (c) 2012 The Chromium Authors. All rights reserved. 4 # Use of this source code is governed by a BSD-style license that can be 5 # found in the LICENSE file. 6 7 # Usage: make_more_helpers.sh <directory_within_contents> <app_name> 8 # 9 # This script creates additional helper .app bundles for Chromium, based on 10 # the existing helper .app bundle, changing their Mach-O header's flags to 11 # enable and disable various features. Based on Chromium Helper.app, it will 12 # create Chromium Helper EH.app, which has the MH_NO_HEAP_EXECUTION bit 13 # cleared to support Chromium child processes that require an executable heap, 14 # and Chromium Helper NP.app, which has the MH_PIE bit cleared to support 15 # Chromium child processes that cannot tolerate ASLR. 16 # 17 # This script expects to be called from the chrome_exe target as a postbuild, 18 # and operates directly within the built-up browser app's versioned directory. 19 # 20 # Each helper is adjusted by giving it the proper bundle name, renaming the 21 # executable, adjusting several Info.plist keys, and changing the executable's 22 # Mach-O flags. 23 24 set -eu 25 26 make_helper() { 27 local containing_dir="${1}" 28 local app_name="${2}" 29 local feature="${3}" 30 local flags="${4}" 31 32 local helper_name="${app_name} Helper" 33 local helper_stem="${containing_dir}/${helper_name}" 34 local original_helper="${helper_stem}.app" 35 if [[ ! -d "${original_helper}" ]]; then 36 echo "${0}: error: ${original_helper} is a required directory" >& 2 37 exit 1 38 fi 39 local original_helper_exe="${original_helper}/Contents/MacOS/${helper_name}" 40 if [[ ! -f "${original_helper_exe}" ]]; then 41 echo "${0}: error: ${original_helper_exe} is a required file" >& 2 42 exit 1 43 fi 44 45 local feature_helper="${helper_stem} ${feature}.app" 46 47 rsync -acC --delete --include '*.so' "${original_helper}/" "${feature_helper}" 48 49 local helper_feature="${helper_name} ${feature}" 50 local helper_feature_exe="${feature_helper}/Contents/MacOS/${helper_feature}" 51 mv "${feature_helper}/Contents/MacOS/${helper_name}" "${helper_feature_exe}" 52 53 local change_flags="$(dirname "${0}")/change_mach_o_flags.py" 54 "${change_flags}" ${flags} "${helper_feature_exe}" 55 56 local feature_info="${feature_helper}/Contents/Info" 57 local feature_info_plist="${feature_info}.plist" 58 59 defaults write "${feature_info}" "CFBundleDisplayName" "${helper_feature}" 60 defaults write "${feature_info}" "CFBundleExecutable" "${helper_feature}" 61 62 cfbundleid="$(defaults read "${feature_info}" "CFBundleIdentifier")" 63 feature_cfbundleid="${cfbundleid}.${feature}" 64 defaults write "${feature_info}" "CFBundleIdentifier" "${feature_cfbundleid}" 65 66 cfbundlename="$(defaults read "${feature_info}" "CFBundleName")" 67 feature_cfbundlename="${cfbundlename} ${feature}" 68 defaults write "${feature_info}" "CFBundleName" "${feature_cfbundlename}" 69 70 # As usual, defaults might have put the plist into whatever format excites 71 # it, but Info.plists get converted back to the expected XML format. 72 plutil -convert xml1 "${feature_info_plist}" 73 74 # `defaults` also changes the file permissions, so make the file 75 # world-readable again. 76 chmod a+r "${feature_info_plist}" 77 } 78 79 if [[ ${#} -ne 2 ]]; then 80 echo "usage: ${0} <directory_within_contents> <app_name>" >& 2 81 exit 1 82 fi 83 84 DIRECTORY_WITHIN_CONTENTS="${1}" 85 APP_NAME="${2}" 86 87 CONTENTS_DIR="${BUILT_PRODUCTS_DIR}/${CONTENTS_FOLDER_PATH}" 88 CONTAINING_DIR="${CONTENTS_DIR}/${DIRECTORY_WITHIN_CONTENTS}" 89 90 make_helper "${CONTAINING_DIR}" "${APP_NAME}" "EH" "--executable-heap" 91 make_helper "${CONTAINING_DIR}" "${APP_NAME}" "NP" "--no-pie" 92
