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Create /data_mirror in init.rc

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Mount a tmpfs on top of it, and serve as a mirror of /data/data
and /data/user_de, which will be used when zygote forks and
overlay its CE and DE storage to prevent app can see other applications.

Also, changed /data/user/0 from symlink to bind mount, so
/data_mirror/data_ce/null can just bind to /data/user directly.

Bug: 143937733
Test: Directories are created and mounted
Change-Id: Ic72c47c9d3dc0ffc98510f5bb351eccf76524232
This commit is contained in:
Ricky Wai 2019-12-12 12:55:03 +00:00 committed by rickywai
parent b773897b01
commit 3cca270e95
2 changed files with 25 additions and 2 deletions
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2
rootdir/Android.mk
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@ -72,7 +72,7 @@ endif
#
# create some directories (some are mount points) and symlinks
LOCAL_POST_INSTALL_CMD := mkdir -p $(addprefix $(TARGET_ROOT_OUT)/, \
dev proc sys system data odm oem acct config storage mnt apex debug_ramdisk \
dev proc sys system data data_mirror odm oem acct config storage mnt apex debug_ramdisk \
linkerconfig $(BOARD_ROOT_EXTRA_FOLDERS)); \
ln -sf /system/bin $(TARGET_ROOT_OUT)/bin; \
ln -sf /system/etc $(TARGET_ROOT_OUT)/etc; \

25
rootdir/init.rc
View file

@ -650,12 +650,35 @@ on post-fs-data
mkdir /data/user 0711 system system encryption=None
mkdir /data/user_de 0711 system system encryption=None
symlink /data/data /data/user/0
# Unlink /data/user/0 if we previously symlink it to /data/data
rm /data/user/0
# Bind mount /data/user/0 to /data/data
mkdir /data/user/0 0700 system system encryption=None
mount none /data/data /data/user/0 bind rec
# Special-case /data/media/obb per b/64566063
mkdir /data/media 0770 media_rw media_rw encryption=None
mkdir /data/media/obb 0770 media_rw media_rw encryption=Attempt
# A tmpfs directory, which will contain all apps CE DE data directory that
# bind mount from the original source.
chown root root /data_mirror
chmod 0700 /data_mirror
mount tmpfs tmpfs /data_mirror mode=0700,uid=0,gid=1000 nodev noexec nosuid
restorecon /data_mirror
mkdir /data_mirror/data_ce 0700 root root
mkdir /data_mirror/data_de 0700 root root
# Create CE and DE data directory for default volume
mkdir /data_mirror/data_ce/null 0700 root root
mkdir /data_mirror/data_de/null 0700 root root
# Bind mount CE and DE data directory to mirror's default volume directory
mount none /data/user /data_mirror/data_ce/null bind rec
mount none /data/user_de /data_mirror/data_de/null bind rec
mkdir /data/cache 0770 system cache encryption=Require
mkdir /data/cache/recovery 0770 system cache
mkdir /data/cache/backup_stage 0700 system system