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From: Chris Wright <chrisw@osdl.org>
To: Zachary Amsden <zach@vmware.com>
Cc: Chuck Ebbert <76306.1226@compuserve.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	virtualization@lists.osdl.org, Chris Wright <chrisw@osdl.org>,
	Pratap Subrahmanyam <pratap@vmware.com>
Subject: Re: [PATCH 7/14] i386 / Add some descriptor convenience  functions
Date: Tue, 16 Aug 2005 11:56:02 -0700	[thread overview]
Message-ID: <20050816185602.GD7762@shell0.pdx.osdl.net> (raw)
In-Reply-To: <43022B0A.4030807@vmware.com>

* Zachary Amsden (zach@vmware.com) wrote:
> I think so too.  I merely moved the code here and didn't notice it in 
> all this excitement.
> 
> 0x00cf9a000xff306600  =>
> 
> Present CPL-0 32-bit code segment, base 0x0000ff30, limit 0xf6601 pages, 
> for which desc_empty(desc) is true.
> 
> Thankfully, this is not used as a security check, but it can falsely 
> overwrite TLS segments with carefully chosen base / limits.  I do not 
> believe this is an issue in practice, but it is a kernel bug.
> 
> Nice catch.  Looks like it affects all 2.6.X kernels.

Thanks, I added this to virt tree, and will push baseline fix up.

thanks,
-chris

  parent reply	other threads:[~2005-08-16 18:56 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-08-16 17:03 [PATCH 7/14] i386 / Add some descriptor convenience functions Chuck Ebbert
2005-08-16 18:06 ` Zachary Amsden
2005-08-16 18:14   ` Andi Kleen
2005-08-16 18:56   ` Chris Wright [this message]
  -- strict thread matches above, loose matches on Subject: below --
2005-08-11  4:56 zach

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