Re: [gtk-list] Problem with Solaris 2.6/X86 and Imlib

[Erik Mouw <J A K Mouw its tudelft nl>]

On Fri, 28 Aug 1998 12:50:38 +0100, John.Looney@hos.horizon.ie (John Looney) wrote:
>  It seems that imlib has yet again been endowed with X server killing
> powers. If any app with a imlib 1.7 & crashes your X server (with only an
> "Invalid unmmap error") then disable MIT shared memory in your ~/.imrc
> file.

I'm not a SunOS/Solaris specialist, but I think I read somewhere that it
is possible to enlarge the maximum size of a shared memory segment to a
reasonable value. Seems to be a tunable kernel parameter.

>  I've logged this as a bug to Sun, but as usual, I got the "It's a 3rd
> party library. Don't expect much" speil. If this could be stuck into
> release notes/FAQ or whatever...

Speaking of which: IIRC the Gimp addresses this shared memory on Solaris
issue (sorry, I don't have the source available over here).

BTW: a crashing X server... if the X server runs suid root and fails with
a segfault, it is trivial to write an exploit that executes some standard
shellcode which gives you a root shell (see the BugTraq mailinglist at
http://www.geek-girl.com/bugtraq/ for examples). If it really segfaults,
contact Sun and tell them you found a potential securety hole, that will
speed things up.


Erik

-- 
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031,  2600 GA Delft, The Netherlands
Phone: +31-15-2785859  Fax: +31-15-2781843  Email J.A.K.Mouw@its.tudelft.nl
WWW: http://www-ict.its.tudelft.nl/~erik/