Date: Sat, 14 Aug 2010 02:28:37 +0100 From: Ben Hutchings <ben@...adent.org.uk> To: Eugene Teo <eugene@...hat.com> Cc: oss-security@...ts.openwall.com, dann frazier <dannf@...ian.org>, "Steven M. Christey" <coley@...us.mitre.org> Subject: Re: kernel: [PARISC] led.c - fix potential stack overflow in led_proc_write() On Sat, 2010-08-14 at 09:00 +0800, Eugene Teo wrote: > On 08/14/2010 08:54 AM, dann frazier wrote: > > On Tue, Aug 03, 2010 at 01:51:15AM -0400, Moritz Muehlenhoff wrote: > >> On Tue, Aug 03, 2010 at 11:46:58AM +0800, Eugene Teo wrote: > >>> Ilja reported way back in Nov 2007. A writer to /proc/pdc/led(?) can > >>> cause the kernel to consume an unbounded amount of stack, and result > >>> in stack corruption. > >>> > >>> http://www.spinics.net/lists/linux-parisc/msg02960.html > >>> > >>> If you need a CVE name, change the subject to indicate that. We are > >>> not requesting one as we do not support the PA-RISC architecture in > >>> our distribution. > >> > >> Debian supports hppa. > >> > >> Steven, please assign a CVE ID. > > > > Ben Hutchings pointed out that this file is only writeable by root - > > can it therefore be considered a security issue? > > From the bug report: > "the problem being that the stack is limited and count is not (except > for the MAX_INT check done in sys_write() I guess). this could lead to > stack corruption (when for example calling capable())." But the file permissions are checked even before the function is called, are they not? Ben. -- Ben Hutchings Once a job is fouled up, anything done to improve it makes it worse. Download attachment "signature.asc" of type "application/pgp-signature" (829 bytes)
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