oss-security - Re: CVE request: kernel: watchdog: ib700wdt.c

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Message-ID: <28fa9c5e0812211745l67725a78od3bc6e1b9d6b6cd8@mail.gmail.com>
Date: Mon, 22 Dec 2008 09:45:07 +0800
From: "Eugene Teo" <eugeneteo@...nel.sg>
To: oss-security@...ts.openwall.com
Cc: "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request: kernel: watchdog: ib700wdt.c - buffer_underflow bug

On Wed, Dec 17, 2008 at 11:36 PM, Marcus Meissner <meissner@...e.de> wrote:
> On Wed, Dec 17, 2008 at 10:14:27AM +0800, Eugene Teo wrote:
>> On Wed, Dec 17, 2008 at 10:00 AM, Steven M. Christey
>> <coley@...us.mitre.org> wrote:
>> >
>> > On Wed, 10 Dec 2008, Eugene Teo wrote:
>> >
>> >> Steve, here's another one that needs a CVE name. Thanks!
>> >>
>> >> http://bugzilla.kernel.org/show_bug.cgi?id=11399
>> >
>> > Similar to the other issue, is this IOCTL reachable by anyone malicious?
>>
>> From what I can see in ibwdt_ioctl(), it does not restrict access to
>> unprivileged users.
>
> Again, depends on how the device node is created I think. Not sure
> what mode udev hands out for those.

I discussed this with Wim, and it depends on the permissions for the
miscdev device, /dev/watchdog. On Fedora, it's accessible by root user
only.

Thanks, Eugene

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