Hello, I would like to report a problem of recent cygwin.
If a user logs in via ssh, the user aqcuires the elevated privilege if the user belongs to Administrators group. The following log is the example of the behaviour. [yano@Express5800-S70 ~]$ touch /cygdrive/c/windows/testfile touch: cannot touch '/cygdrive/c/windows/testfile': Permission denied [yano@Express5800-S70 ~]$ ssh localhost yano@localhost's password: Last login: Thu Mar 7 00:06:21 2019 from ::1 CYGWIN_NT-10.0-WOW Express5800-S70 3.0.2(0.338/5/3) 2019-03-05 19:01 i686 Cygwin [yano@Express5800-S70 ~]$ touch /cygdrive/c/windows/testfile [yano@Express5800-S70 ~]$ rm /cygdrive/c/windows/testfile [yano@Express5800-S70 ~]$ exit logout Connection to localhost closed. [yano@Express5800-S70 ~]$ Because of this behaviour, the process started in a ssh session cannot be killed from a normal mintty session. This also causes gnu screen to freeze. To reproduce this: (1) Start screen in mintty window. (2) Detatch from the screen (Ctrl-A d). (3) Login via ssh. (4) Attach screen by 'screen -r' in ssh session. (5) Detach from the screen (Ctrl-A d). (6) screen freezes and is not terminated normally. This does not occur if the user does not belong to Administrators group. I guess this is a problem of setuid codes. -- Takashi Yano <takashi.y...@nifty.ne.jp> -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
