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Description of problem: "write", "who" do mistakes when determining users' message status. These utils only check "group writable" bit on tty, but not "group tty" ownership. Version-Release number of selected component (if applicable): util-linux-ng-2.13.1-2.fc8 How reproducible: Change group on tty and check: who -wu write This bug does hit when user logs in with gdm (look at the status of /dev/tty7): root - tty1 2008-07-07 11:08 00:17 2443 user_a + tty7 2008-07-07 11:13 . 15676 (:0) user_a + pts/0 2008-07-07 11:13 . 15748 user_a + pts/1 2008-07-07 11:15 00:10 16002 user_a + pts/2 2008-07-07 11:17 00:11 16132 user_b + pts/6 2008-07-07 09:32 01:55 8453 (xxx.xxx.x.xx) then: $ ls -l /dev/tty7 crw--w---- 1 root root 4, 7 lip 7 08:12 /dev/tty7 $ write user_a write: user_a is logged in more than once; writing to tty7 write: /dev/tty7: Permission denied
Created attachment 311135 [details] Added check of tty gid against process egid in write
Thanks a lot. The patch (with a minor change) has been committed ( bf09b61a3283ddce337700e791c0c02aa2265aae) to the upstream repository. I'm going to backport the patch to F8 and F9 ASAP.
The patch applied to F9.
util-linux-ng-2.13.1-8.3.fc9 has been submitted as an update for Fedora 9
util-linux-ng-2.13.1-8.3.fc9 has been pushed to the Fedora 9 stable repository. If problems still persist, please make note of it in this bug report.