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Message-ID: <4C65EA99.5010109@redhat.com>
Date: Sat, 14 Aug 2010 09:00:09 +0800
From: Eugene Teo <eugene@...hat.com>
To: oss-security@...ts.openwall.com
CC: dann frazier <dannf@...ian.org>,
"Steven M. Christey" <coley@...us.mitre.org>, ben@...adent.org.uk
Subject: Re: kernel: [PARISC] led.c - fix potential stack overflow
in led_proc_write()
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())."
Eugene
--
main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i); }
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