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