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Open Source and information security mailing list archives
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Date: Sat, 4 Nov 2006 21:02:12 +0100 From: Andi Kleen <ak@...e.de> To: Zachary Amsden <zach@...are.com> Cc: Chuck Ebbert <76306.1226@...puserve.com>, Andrew Morton <akpm@...l.org>, Linus Torvalds <torvalds@...l.org>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: [patch] i386: remove IOPL check on task switch > Ok, checking shows Linus put it back to stop NT leakage. It is also needed to stop AC 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. If it's worth it... If it's worth for the context switch i think it would make more sense to do it for the normal restore_flags() etc. which are much more common (and could be actually handled in most cases with test + jump + sti) -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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