by Bucksch2Pa » Sun, 22 Apr 2001 19:56:29
What do I have to change, and why does it occur after restoring the backup?
Thanks and greetings,
Georg
1. /dev/ttyp# & /dev/pts permissions
Recently there was a post to the linux-security list indicating a problem
with permissions on the /dev/pts filesystem. It had something to do with
incorrect permissions on the /dev/pts directory, and the fact that the
entries were being created as "world-writeable", such that another logged in
user could potentially flood a tty with garbage (i.e. cat /dev/urandom >
/dev/pts/0). This was very intriguing, so I went and looked into what
permissions were being used on my box. First I discovered that I had not
correctly updated the dev RPM, do I didn't even have the /dev/pts
filesystem. My stuff still works because I use wterm-6.2.6, which
apparently doesn't support the new UNIX98 pty system. This leads to my
first question. Since wterm still uses the /dev/ttyp# devices, why are
_all_ 256 of my /dev/ttyp "world-writeable" AND "world-readable"? If I
change it (i.e.. chmod 600 /dev/ttyp0), the when I wterm as a normal user it
skips this tty and will use /dev/ttyp1 (ie. it uses the first available full
access (666) tty)...Thus, it would appear that my term is wide-open to
anyone else on my box (fortunately, I am the only one, but I want to know
what the heck is going on here). When I telnet to a FreeBSD box at work,
the /dev/ttyp# entries are correctly mode 600, so perhaps its a compile
option or configuration setting somewhere?
I have now updated my dev files, and I am trying to move towards using only
/dev/pts enabled servers, but wterm is such a cool term that I don't want to
get rid of it just yet. The latest rxvt release (www.rxvt.org) _does_
support the /dev/pts stuff, _and_ has transparency and next-scroll, but no
side menu or transparent scroll gutter (yeah, yeah, I'm a sucker for bells
and whistles). If anyone can point me in the direction of information about
tty's and permissions, I would be most appreciative, as I haven't been able
to find much of anything on this topic, and it seems to be a very important
issue to understand.
Thanks for reading all of this!!
- Dardo
3. diff between /dev/tty and /dev/pts
4. slip + mgetty, where is the username ?
5. tty-dev-number <-> /dev/pts
6. HELP! - Strange message when running preinst.sh, for installing Xfree86 3.3.3.1
7. help on upgrade /dev/pts from /dev/ttyp
9. RedHat 6.0, /dev/pts permissions bug when using xterm
10. /dev/pts permissions problem
11. /dev/pts/ permissions problem
12. dump pts output to other pts
13. Why all the pts/0, pts/1, ... on RedHat 7.1 ?