linux-kernel - Re: [patch] i386: remove IOPL check on task switch

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Message-ID: <Pine.LNX.4.64.0611041152060.25218@g5.osdl.org>
Date:	Sat, 4 Nov 2006 11:52:49 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Zachary Amsden <zach@...are.com>
cc:	Chuck Ebbert <76306.1226@...puserve.com>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...l.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch] i386: remove IOPL check on task switch



On Sat, 4 Nov 2006, Zachary Amsden wrote:
>
> Ok, checking shows Linus put it back to stop NT leakage.  This is correct, but
> unlikely.  Would be nice to avoid it unless absolutely necessary.  Perhaps xor
> eflags old and new and only set_system_eflags() if non-ALU bits have changed.

Not just NT. AC also leaked, and caused crashes in other programs (Wine) 
that didn't expect AC to be set and did unaligned accesses.

		Linus
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