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#!/system/bin/sh
#
# Copyright (C) 2017 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# This script will extract ASAN libraries from /system/asan.tar.gz to /data and then reboot.
# TODO:
# * Timestamp or something to know when to run this again. Right now take the existence of
# /data/lib as we're already done.
# * Need to distinguish pre- from post-decryption for FDE.
SRC=/system/asan.tar.bz2
MD5_FILE=/data/asan.md5sum
ASAN_DIR=/data/asan
# Minimum /data size in blocks. Arbitrarily 512M.
MIN_DATA_SIZE=131072
# Checks for FDE pre-decrypt state.
VOLD_STATUS=$(getprop vold.decrypt)
if [ "$VOLD_STATUS" = "trigger_restart_min_framework" ] ; then
log -p i -t asan_install "Pre-decrypt FDE detected (by vold property)!"
exit 1
fi
STATFS_BLOCKS=$(stat -f -c '%b' /data)
if [ "$STATFS_BLOCKS" -le "$MIN_DATA_SIZE" ] ; then
log -p i -t asan_install "Pre-decrypt FDE detected (by /data size)!"
exit 1
fi
# Check for ASAN source.
if ! test -f $SRC ; then
log -p i -t asan_install "Did not find $SRC!"
exit 1
fi
log -p i -t asan_install "Found $SRC, checking whether we need to apply it."
# Checksum check.
ASAN_TAR_MD5=$(md5sum $SRC)
if test -f $MD5_FILE ; then
INSTALLED_MD5=$(cat $MD5_FILE)
if [ "x$ASAN_TAR_MD5" = "x$INSTALLED_MD5" ] ; then
log -p i -t asan_install "Checksums match, nothing to be done here."
exit 0
fi
fi
# Actually apply the source.
# Just clean up, helps with restorecon.
rm -rf $ASAN_DIR
log -p i -t asan_install "Untarring $SRC..."
# Unzip from /system/asan.tar.gz into data. Need to pipe as gunzip is not on device.
bzip2 -c -d $SRC | tar -x -f - --no-same-owner -C / || exit 1
# Cannot log here, log would run with system_data_file.
# Set correct permission bits.
chmod -R 744 $ASAN_DIR
cd $ASAN_DIR ; find . -type d -exec chmod 755 {} \;
restorecon -R -F $ASAN_DIR/*/lib*
log -p i -t asan_install "Fixed selinux labels..."
# Now write down our checksum to mark the extraction complete.
echo "$ASAN_TAR_MD5" > $MD5_FILE
# We want to reboot now. It seems it is not possible to run "reboot" here, the device will
# just be stuck.
log -p i -t asan_install "Signaling init to reboot..."
setprop sys.powerctl reboot
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