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Re: [suse-security] ulimit -v workaround for the do_brk() bug does not work



On Wed, Dec 03, 2003 at 05:22:36PM -0500, GarUlbricht7@xxxxxxxxxxxx wrote:
> Erik Hensema <erik@xxxxxxxxxxx> 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    

[snip]

> It would be best to Read, the entire thread 
> "RE: [suse-security] Bugs on Kernel 2.4" at:
> http://lists.suse.com/archive/suse-security/2003-Dec/ 

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 (erik@xxxxxxxxxxx)

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