asan_extract.sh revision df5496aa65c3a890c6bb584f052c97324330b9ca 
1#!/system/bin/sh
2
3#
4# Copyright (C) 2017 The Android Open Source Project
5#
6# Licensed under the Apache License, Version 2.0 (the "License");
7# you may not use this file except in compliance with the License.
8# You may obtain a copy of the License at
9#
10#      http://www.apache.org/licenses/LICENSE-2.0
11#
12# Unless required by applicable law or agreed to in writing, software
13# distributed under the License is distributed on an "AS IS" BASIS,
14# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15# See the License for the specific language governing permissions and
16# limitations under the License.
17#
18
19# This script will extract ASAN libraries from /system/asan.tar.gz to /data and then reboot.
20
21# TODO:
22#   * Timestamp or something to know when to run this again. Right now take the existence of
23#     /data/lib as we're already done.
24#   * Need to distinguish pre- from post-decryption for FDE.
25
26SRC=/system/asan.tar.bz2
27MD5_FILE=/data/asan.md5sum
28
29if ! test -f $SRC ; then
30  log -p i -t asan_install "Did not find $SRC!"
31  exit 1
32fi
33
34log -p i -t asan_install "Found $SRC, checking whether we need to apply it."
35
36ASAN_TAR_MD5=$(md5sum $SRC)
37if test -f $MD5_FILE ; then
38  INSTALLED_MD5=$(cat $MD5_FILE)
39  if [ "x$ASAN_TAR_MD5" = "x$INSTALLED_MD5" ] ; then
40    log -p i -t asan_install "Checksums match, nothing to be done here."
41    exit 0
42  fi
43fi
44
45# Just clean up, helps with restorecon.
46rm -rf /data/lib /data/lib64 /data/vendor/lib*
47
48log -p i -t asan_install "Untarring $SRC..."
49
50# Unzip from /system/asan.tar.gz into data. Need to pipe as gunzip is not on device.
51bzip2 -c -d $SRC | tar -x -f - --no-same-owner -C / || exit 1
52
53# Cannot log here, log would run with system_data_file.
54
55restorecon -R -F /data/lib* /data/vendor/lib*
56
57log -p i -t asan_install "Fixed selinux labels..."
58
59echo "$ASAN_TAR_MD5" > $MD5_FILE
60
61# We want to reboot now. It seems it is not possible to run "reboot" here, the device will
62# just be stuck.
63
64log -p i -t asan_install "Signaling init to reboot..."
65
66setprop asan.restore_reboot 1
67