** Changed in: util-linux (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/980835
Title:
tty[1-6] is now root:tty 0660 instead of root:root 0600
Status in Util-Linux-ng:
Fix Released
Status in util-linux package in Ubuntu:
Fix Released
Bug description:
As of precise (2.20.1-1ubuntu3 to be exact), /dev/tty[1-6] now has the
following permissions:
$ ls -l /dev/tty[1-6]
crw-rw---- 1 root tty 4, 1 Apr 12 13:06 /dev/tty1
crw-rw---- 1 root tty 4, 2 Apr 12 13:06 /dev/tty2
crw-rw---- 1 root tty 4, 3 Apr 12 13:06 /dev/tty3
crw-rw---- 1 root tty 4, 4 Apr 12 13:06 /dev/tty4
crw-rw---- 1 root tty 4, 5 Apr 12 13:06 /dev/tty5
crw-rw---- 1 root tty 4, 6 Apr 12 13:06 /dev/tty6
In 11.10 and earlier (I checked back to hardy), the permissions were:
$ ls -l /dev/tty[1-6]
crw------- 1 root root 4, 1 2012-03-25 09:18 /dev/tty1
crw------- 1 root root 4, 2 2012-03-25 09:17 /dev/tty2
crw------- 1 root root 4, 3 2012-03-25 09:17 /dev/tty3
crw------- 1 root root 4, 4 2012-03-25 09:17 /dev/tty4
crw------- 1 root root 4, 5 2012-03-25 09:17 /dev/tty5
crw------- 1 root root 4, 6 2012-03-25 09:17 /dev/tty6
This appears to be because of this util-linux commit:
http://git.kernel.org/?p=utils/util-linux/util-linux.git;a=commit;h=3aa6b68f7e19fa3e1c2bba75bee921a98b7b46af
I'm not sure if this is a problem, but it isn't clear why the change was made
and I'm having a hard time knowing why the group was changed. This is the bit
of code that I think is the cause:
+ /*
+ * There is always a race between this reset and the call to
+ * vhangup() that s.o. can use to get access to your tty.
+ * Linux login(1) will change tty permissions. Use root owner
and group
+ * with permission -rw------- for the period between getty
and login.
+ */
+ if (chown (buf, 0, gid) || chmod (buf, (gid ? 0660 : 0600))) {
+ if (errno == EROFS)
+ log_warn("%s: %m", buf);
+ else
+ log_err("%s: %m", buf);
+ }
There might not be anything to do with this, but I am filing it to get
other's opinions.
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