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..serious bugs in Intel's Core 2 cpu

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m.aleks
Aleksandar Milošević
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icon ..serious bugs in Intel's Core 2 cpu30.06.2007. u 21:26 - pre 204 meseci
http://article.gmane.org/gmane.os.openbsd.misc/125708

Ova poruka može da se postavi u neki hardveraški forum, ali preporuke potiču od developera OpenBSD sistema i upućene su korisnicima tog sistema. Eto ove poruke ovde da ne smaramo druge...
---

From: Theo de Raadt <deraadt <at> cvs.openbsd.org>
Subject: Intel Core 2
Newsgroups: gmane.os.openbsd.misc
Date: 2007-06-27 17:08:16 GMT (3 days, 2 hours and 55 minutes ago)

Various developers are busy implimenting workarounds for serious bugs
in Intel's Core 2 cpu.

These processors are buggy as hell, and some of these bugs don't just
cause development/debugging problems, but will *ASSUREDLY* be
exploitable from userland code.

As is typical, BIOS vendors will be very late providing workarounds /
fixes for these processors bugs. Some bugs are unfixable and cannot
be worked around. Intel only provides detailed fixes to BIOS vendors
and large operating system groups. Open Source operating systems are
largely left in the cold.

Full (current) errata from Intel:

http://download.intel.com/design/processor/specupdt/31327914.pdf

- We bet there are many more errata not yet announced -- every month
this file gets larger.

- Intel understates the impact of these erraata very significantly.
Almost all operating systems will run into these bugs.

- Basically the MMU simply does not operate as specified/implimented
in previous generations of x86 hardware. It is not just buggy, but
Intel has gone further and defined "new ways to handle page tables"
(see page 58).

- Some of these bugs are along the lines of "buffer overflow"; where
a write-protect or non-execute bit for a page table entry is ignored.
Others are floating point instruction non-coherencies, or memory
corruptions -- outside of the range of permitted writing for the
process -- running common instruction sequences.

- All of this is just unbelievable to many of us.

An easier summary document for some people to read:

http://www.geek.com/images/gee...o_errata__2006_01_21__full.gif

Note that some errata like AI65, AI79, AI43, AI39, AI90, AI99 scare
the hell out of us. Some of these are things that cannot be fixed in
running code, and some are things that every operating system will do
until about mid-2008, because that is how the MMU has always been
managed on all generations of Intel/AMD/whoeverelse hardware. Now
Intel is telling people to manage the MMU's TLB flushes in a new and
different way. Yet even if we do so, some of the errata listed are
unaffected by doing so.

As I said before, hiding in this list are 20-30 bugs that cannot be
worked around by operating systems, and will be potentially
exploitable. I would bet a lot of money that at least 2-3 of them
are.

For instance, AI90 is exploitable on some operating systems (but not
OpenBSD running default binaries).

At this time, I cannot recommend purchase of any machines based on the
Intel Core 2 until these issues are dealt with (which I suspect will
take more than a year). Intel must be come more transparent.

(While here, I would like to say that AMD is becoming less helpful day
by day towards open source operating systems too, perhaps because
their serious errata lists are growing rapidly too).


--
Cancel my subscription to the resurrection
 
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3dd13
Bosnia & Hercegowina

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icon Re: ..serious bugs in Intel's Core 2 cpu01.07.2007. u 13:50 - pre 204 meseci
intel inside... mah... nikad ga nisam koristio niti planiram, e sad koliko je bugovit prikazuje ovo cudo, ja se drzim svog gentoo-a na athlonu... (freebsd mi je druga boot opcija, i zasad je za learning period)
I dont need netbsd on a toster...
 
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Mitrović Srđan
bloodzero
Freelance
Majur //: Šabac

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icon Re: ..serious bugs in Intel's Core 2 cpu01.07.2007. u 16:29 - pre 204 meseci
Hot tema ovih dana nema sta.
Sta ce to da izrodi videcemo :0
Tony Melendez:
http://video.google.com/videoplay?docid=-
3819862628517136815&q=tony+melendez

NIKADA NE UZIMATI HOSTING NA GO DADDY!


 
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cest
Stevan Cerovec
o.d. MediacoM - Bačka Palanka
duboka provincija

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icon Re: ..serious bugs in Intel's Core 2 cpu09.07.2007. u 11:12 - pre 204 meseci
Ne mogu da verujem...
Taman kad mislish da si bezbedan sa Open Source-om, oni naprave exploit na hardveru ???

Valjda se boje da nece moci da prislushkuju ili obore neki server ???
:: pljuje na pod ::
:-/

========================
Tko vrijedi leti
Tko leti vrijedi
Tko ne lijeti ne vredi
"Slackware"=="leteti"
========================
 
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Nic0
/root

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icon Re: ..serious bugs in Intel's Core 2 cpu11.07.2007. u 01:03 - pre 204 meseci
ma nista...i dalje sam ja vjeran intelu :D :D :D...pa sta bi bilo da cim se pronade neki vuln na nekom "hardweru" ili softweru da ga odmah prestanem koristiti ?... na cemu bi onda bio :D...zakopo bi kompa doma na vrtu i to je to...jer sve sto covjek napravi nije savrseno :D...iako je ovo zanimljiva tema i dalo bi se razglabat o tome :D
 
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Vladokv
Vladimir Knezevic
Svuda po gradu
Sopstvena Gewerbe
Berlin

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icon Re: ..serious bugs in Intel's Core 2 cpu11.07.2007. u 09:28 - pre 204 meseci
Pa koji je onda siguran CPU? Zar ne bi trebalo da se pravi bolje i sigurnije, a ne sve lošije?
 
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Braffe

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icon Re: ..serious bugs in Intel's Core 2 cpu22.11.2007. u 16:29 - pre 199 meseci
Citat:
3dd13: intel inside... mah... nikad ga nisam koristio niti planiram, e sad koliko je bugovit prikazuje ovo cudo, ja se drzim svog gentoo-a na athlonu... (freebsd mi je druga boot opcija, i zasad je za learning period)


Citat:
m.aleks: (While here, I would like to say that AMD is becoming less helpful day
by day towards open source operating systems too, perhaps because
their serious errata lists are growing rapidly
too).


 
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