HI, ALL

I want to run su command from an Application(the AndroidTerm application)
which is specified to run with the shell user, but I found it failed to the
su command because the euid is not change to the owner of the su command.

Here is the output:
shell@flounder:/ $ ls -Z /system/xbin/s
sane_schedstat showmap        showslab       simpleperf     sqlite3
 strace         stringbench    stringbench64  su
shell@flounder:/ $ ls -Z /system/xbin/su
-rwsr-x--- root     shell             u:object_r:su_exec:s0 su
shell@flounder:/ $ ls -l /system/xbin/su
-rwsr-x--- root     shell       10232 2016-02-14 17:05 su
shell@flounder:/ $ id
uid=2000(shell) gid=2000(shell)
groups=2000(shell),1015(sdcard_rw),1023(media_rw),3002(net_bt),3003(inet),3008(net_bt_stack),9997(everybody),42000(u0_a32000)
context=u:r:shell:s0
shell@flounder:/ $ su
current_uid=2000, current_euid=2000, current_gid=2000, current_egid=2000
su: setgid failed: Operation not permitted
1|shell@flounder:/ $

from the above, you can see the euid output from su command is shell user
id, not the root user id.

If I run su from adb shell, it will work, The output is like following:
shell@flounder:/ $ id
uid=2000(shell) gid=2000(shell)
groups=2000(shell),1004(input),1007(log),1011(adb),1015(sdcard_rw),1028(sdcard_r),3001(net_bt_admin),3002(net_bt),3003(inet),3006(net_bw_stats)
context=u:r:su:s0
shell@flounder:/ $ su
current_uid=2000, current_euid=0, current_gid=2000, current_egid=2000
root@flounder:/ #

I guess the failure from APP has something related SELinux, but I can not
find out where makes the euid not chnaged.
I tried from APP with Permissive mode, it still fails.

Anyone has any idea why the euid is not change when I run from APP?
Which source should I check?


Thanks in advance!
-- 
Best Regards,
Yongqin Liu
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