linux-kernel - Re: [PATCH] x86, AMD: Correct F15h IC aliasing issue

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 25 Jul 2011 22:58:43 -0700
From:	Ray Lee <ray-lk@...rabbit.org>
To:	Borislav Petkov <bp@...64.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"Przywara, Andre" <Andre.Przywara@....com>,
	"Pohlack, Martin" <Martin.Pohlack@....com>
Subject: Re: [PATCH] x86, AMD: Correct F15h IC aliasing issue

On Mon, Jul 25, 2011 at 2:53 PM, Borislav Petkov <bp@...64.org> wrote:
>
> On Mon, Jul 25, 2011 at 04:06:45PM -0400, Ingo Molnar wrote:
> >
> > * Borislav Petkov <bp@...64.org> wrote:
> >
> > > So yeah, the simpler fix works for processes mapping libraries in
> > > the same order but not for processes mapping a subset of libraries
> > > in a different order.
> >
> > but what is the proportion of 'good' versus bad alignment of
> > libraries, could you collect some stats on a representative enough,
> > fully booted up Linux system?
> >
> > Are only 1% of mappings 'bad'? 5%? 10%? 50%? We have no idea and the
> > actual number matters a lot.
>
> Actually, it's hard to say what is a 'good' and 'bad' allocation. If
> they don't alias, they're always good :).

Count the number of aliases per total mappings, and report that as a
failure percentage? It doesn't have to be a perfect metric, it just
needs to be a meaningful and repeatable one.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/