From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out2-smtp.messagingengine.com ([66.111.4.26]:52653 "EHLO out2-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752452AbcHNPyp (ORCPT ); Sun, 14 Aug 2016 11:54:45 -0400 Date: Sun, 14 Aug 2016 17:54:32 +0200 From: Greg KH To: James Morse Cc: linux-arm-kernel@lists.infradead.org, Will Deacon , Catalin Marinas , stable@vger.kernel.org Subject: Re: [stable:PATCH 1/2] arm64: kernel: Save and restore addr_limit on exception entry Message-ID: <20160814155432.GA27321@kroah.com> References: <1471025480-10394-1-git-send-email-james.morse@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1471025480-10394-1-git-send-email-james.morse@arm.com> Sender: stable-owner@vger.kernel.org List-ID: On Fri, Aug 12, 2016 at 07:11:19PM +0100, James Morse wrote: > commit e19a6ee2460bdd0d0055a6029383422773f9999a upstream. > > If we take an exception while at EL1, the exception handler inherits > the original context's addr_limit value. To be consistent always reset > addr_limit and PSTATE.UAO on (re-)entry to EL1. This prevents accidental > re-use of the original context's addr_limit. > > Based on a similar patch for arm from Russell King. > > Acked-by: Will Deacon > Reviewed-by: Mark Rutland > Signed-off-by: James Morse > Signed-off-by: Will Deacon > [ backport to stop perf misusing inherited addr_limit. > Removed code interacting with UAO and the irqstack ] > Link: https://bugs.chromium.org/p/project-zero/issues/detail?id=822 > Signed-off-by: James Morse > Cc: #4.1 Fails to apply to 4.4-stable, can you provide a backport for both of these to that tree if you want them there? thanks, greg k-h