linux-kernel - Re: [RFC] x86: xsave/xrstor support, ucontext

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Date:	Tue, 20 May 2008 13:10:44 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mikael Pettersson <mikpe@...uu.se>, mingo@...e.hu,
	tglx@...utronix.de, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, drepper@...hat.com,
	Hongjiu.lu@...el.com, linux-kernel@...r.kernel.org,
	arjan@...ux.intel.com, rmk+lkml@....linux.org.uk, dan@...ian.org,
	asit.k.mallick@...el.com
Subject: Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions

> I don't think there is one. We never copy fxsave completely out of the
> kernel. x86-64 does FXSAVE directly in/out user space, but the
> only leak is what there was before.

ptrace/user_regset copies out and in the whole fxsave block from the ptrace
caller.  (Only the mxcsr word is constrained after copy-in.)


Thanks,
Roland
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