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Re: [suse-security] ulimit -v workaround for the do_brk() bug does not work
From: Erik Hensema (erikhensema.net)
Date: Thu Dec 04 2003 - 03:55:42 CST
On Wed, Dec 03, 2003 at 05:22:36PM -0500, GarUlbricht7netscape.net wrote:
> Erik Hensema <erikhensema.net> wrote:
> > Hi,
> > Maybe this has been discussed earlier today on this list,
> > but I've just joined it.
> > I was told that doing a 'limit -v 2097151' would work around
> > the do_brk() bug. Unfortunately it does not :-(
> > The sample exploit posted on bugtraq manages to reboot
> > my SuSE 8.2 machine (standard kernel) despite the ulimit.
> Roman in hiw original post suggested two other things
> needed to be done to install this work around:
> Add the line
> ulimit -v 2097151
> It would be best to Read, the entire thread
> "RE: [suse-security] Bugs on Kernel 2.4" at:
Thanks, I've read it.
Setting a ulimit unfortunately only fixes one of three possible attacks on
do_brk(). I must warn everybody NOT to rely on this workaround! It simply
does not protect your system at all.
Installing a patched kernel and rebooting is the only option.
Erik Hensema (erikhensema.net)
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