On Sun 2007-12-16 15:34:58, H. Peter Anvin wrote:
> Pavel Machek wrote:
>> Hi!
>>> The process of safely making delicate changes here is beyond my
>>> responsibility as just a user - believe me, I'm not suggesting that a
>>> risky fix be put in .24. I can patch my own kernels, and I can even
>>> share an unofficial patch with others for now, or suggest that Fedora and
>>> Ubuntu add it to their downstream.
>>>
>>> May I make a small suggestion, though. If the decision is a DMI-keyed
>>> switch from out-80 to udelay(2) gets put in, perhaps there should also
>>> be a way for people to test their own configuration for the underlying
>>> problem made available as a script. Though it is a "hack", all you need
>>> to freeze a problem system is to run a loop doing about 1000 "cat
>>> /dev/nvram > /dev/null" commands. If that leads to a freeze, one might
>>> ask to have the motherboard added to the DMI-key list.
>> Can you freeze it by catting /dev/rtc, too? That may be significant,
>> because that is readable for group audio (at least on some
>> systems)... which would smell like "small security hole" to me.
>
> Heck, on my system (Fedora 7), it's mode 644...
Ok, time to CC security team, I'd say.
Problem is, that some AMD64x2 nVidia laptops crash on port 0x80
access... which is easily user-triggerable by using /dev/rtc. If it is
644 on Fedora, I guess we have a problem.
Otoh, it is "only" a denial of service, and it can probably be
attributed to "buggy hardware". Is that still relevant for security team?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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