最近翻出来一个老旧的nuxus 6手机，准备烧个系统玩玩，烧个带su的user版本的android 7.1，烧出来之后，出现一个奇葩的问题，root用户竟然不能访问/data/目录（selinux也关了）
shamu:/ # cd /data
shamu:/data # ls
ls: .: Permission denied
1|shamu:/data # ls
ls: .: Permission denied
1|shamu:/data # whoami
root
shamu:/data # ls -al
ls: .: Permission denied
1|shamu:/data # cd ..
shamu:/ # getenforce
Permissive
shamu:/ # ls -al
total 2570
drwxr-xr-x 19 root root 0 1970-01-09 10:50 .
drwxr-xr-x 19 root root 0 1970-01-09 10:50 ..
drwxr-xr-x 29 root root 0 1970-01-09 10:50 acct
lrwxrwxrwx 1 root root 50 1970-01-01 00:00 bugreports -> /data/user_de/0/com.android.shell/files/bugreports
drwxrwx--- 6 system cache 4096 1970-01-09 10:50 cache
lrwxrwxrwx 1 root root 13 1970-01-01 00:00 charger -> /sbin/healthd
drwxr-xr-x 4 root root 0 1970-01-01 00:00 config
lrwxrwxrwx 1 root root 17 1970-01-01 00:00 d -> /sys/kernel/debug
drwxrwx--x 43 system system 4096 1970-01-09 10:50 data
-rw-r--r-- 1 root root 1076 1970-01-01 00:00 default.prop
drwxr-xr-x 17 root root 4220 1970-01-09 10:50 dev
lrwxrwxrwx 1 root root 11 1970-01-01 00:00 etc -> /system/etc
-rw-r--r-- 1 root root 102517 1970-01-01 00:00 file_contexts.bin

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