From: Amit Shah <shahamit@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: ck@vds.kolivas.org
Subject: Re: [PATCH] Sample fix for hyperthread exploit
Date: Thu, 02 Jun 2005 11:58:45 +0530 [thread overview]
Message-ID: <d7m8u0$ivc$1@sea.gmane.org> (raw)
In-Reply-To: 20050602024924.GD27174@elte.hu
Ingo Molnar wrote:
>
> * 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.
Can this be not limited to just not running any other process on the same
(SMT-enabled) processor (precondition being ability to ptrace)?
Amit.
--
Amit Shah
http://amitshah.net/
prev parent reply other threads:[~2005-06-02 6:32 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
2005-06-02 2:57 ` Con Kolivas
2005-06-02 6:28 ` Amit Shah [this message]
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