Android modified su binary errors on setgid

Question

I created a custom su file for testing.

I copied the binary to / system / xbin / mod _su

I changed the file permissions using chmod 6755 / system / xbin / mod_su,

but still, when I run the binary as a non-root user, I fail in setgid (0) with "Operation not allowed1"

Any ideas why this might happen?

6755 permmisons is not enough?

+3

jacob Feb 06 '14 at 12:17

2 answers

skoperst · Answer 1 · 2014-02-06T14:16:16+0000

You chown root.root it before chmod?

Apriori · Answer 2 · 2014-02-06T17:48:47+0000

Besides chown, you can also try

chmod 4755

4 indicates the specified user ID, which may be the cause of the error.