linux-kernel - Re: [PATCH 4/7] x86: Add support for rd/wr fs/gs base

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Message-ID: <20140501221836.GI19657@tassilo.jf.intel.com>
Date:	Thu, 1 May 2014 15:18:36 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andy Lutomirski <luto@...capital.net>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/7] x86: Add support for rd/wr fs/gs base

> I haven't looked through the flows (I'm at LCE so I have limited screen
> bandwidth) to see how that would be handled in this case, but in the
> general paranoid case it comes down to the fact that in this particular
> subcase we don't necessarily know exactly how many SWAPGS are between us
> and userspace after we IRET.

There is none as far as I know. Certainly wasn't any when the code
was originally written.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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