From: Ingo Molnar <mingo@elte.hu>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Chris Wright <chrisw@osdl.org>, Con Kolivas <kernel@kolivas.org>,
linux kernel mailing list <linux-kernel@vger.kernel.org>,
ck list <ck@vds.kolivas.org>
Subject: Re: [PATCH] Sample fix for hyperthread exploit
Date: Thu, 2 Jun 2005 04:49:24 +0200 [thread overview]
Message-ID: <20050602024924.GD27174@elte.hu> (raw)
In-Reply-To: <1117654147.6271.38.camel@laptopd505.fenrus.org>
* Arjan van de Ven <arjan@infradead.org> wrote:
> > Also, uid is not sufficient. Something more comprehensive (like ability
> > to ptrace) would be appropriate.
>
> I would go a lot simpler. App says "I want exclusivity" via pctl and
> NOTHING runs on the other half. Well maybe with exceptions of
> processes that share the mm with the exclusive one (in practice
> "threads") since those could just read the memory anyway.
this has the disadvantage of needing changes in the security apps.
Basing this off the uid (or the ability to ptrace) makes it at least
automatic - but introduces a permanent penalty not only on multiuser
boxes, but on basically any server box that runs multiple services.
Ingo
next prev parent reply other threads:[~2005-06-02 2:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-01 11:58 [PATCH] Sample fix for hyperthread exploit Con Kolivas
2005-06-01 12:06 ` Arjan van de Ven
2005-06-01 12:13 ` Con Kolivas
2005-06-01 17:25 ` Chris Wright
2005-06-01 19:29 ` Arjan van de Ven
2005-06-02 2:49 ` Ingo Molnar [this message]
2005-06-02 2:57 ` Con Kolivas
2005-06-02 6:28 ` Amit Shah
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