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Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k42CS-0007gF-Ff; Fri, 07 Aug 2020 13:14:20 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1k42CP-0007fY-5u for linux-arm-kernel@lists.infradead.org; Fri, 07 Aug 2020 13:14:18 +0000 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7D31C22C9F; Fri, 7 Aug 2020 13:14:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596806056; bh=FtlvdFU0rYHu3NtmhLjOvAgzY9+CtYRM9ziRa0ODO0A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=gmZIGCEcgfuVdz+6J2O7xd/KbPIF8Kt0i6lVH1/0GwDcP4ahviudYfWt2hAY9j7B+ aWdmlsXly326kOqV/BPhToRn3VR8LfDF+AQAJNY0pdH7uq8FP5GpGuc8TV3OPPvqvs KY2003KRA8He4FRGu9xn2B11aFr5mnbTQA8dFXSc= Date: Fri, 7 Aug 2020 15:14:29 +0200 From: Greg KH To: Florian Fainelli Subject: Re: [PATCH stable v4.9 v2] arm64: entry: Place an SB sequence following an ERET instruction Message-ID: <20200807131429.GB664450@kroah.com> References: <20200709195034.15185-1-f.fainelli@gmail.com> <20200720130411.GB494210@kroah.com> <9c29080e-8b3a-571c-3296-e0487fa473fa@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <9c29080e-8b3a-571c-3296-e0487fa473fa@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200807_091417_340681_093B8800 X-CRM114-Status: GOOD ( 17.95 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Nick Desaulniers , Andrew Jones , Fangrui Song , Suzuki K Poulose , Marc Zyngier , Will Deacon , open list , stable@vger.kernel.org, "open list:KERNEL VIRTUAL MACHINE FOR ARM64 \(KVM/arm64\)" , Mark Brown , James Morse , Julien Thierry , Sami Tolvanen , Catalin Marinas , Kristina Martsenko , Will Deacon , Ard Biesheuvel , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Aug 06, 2020 at 01:00:54PM -0700, Florian Fainelli wrote: > > > On 7/20/2020 11:26 AM, Florian Fainelli wrote: > > On 7/20/20 6:04 AM, Greg KH wrote: > >> On Thu, Jul 09, 2020 at 12:50:23PM -0700, Florian Fainelli wrote: > >>> From: Will Deacon > >>> > >>> commit 679db70801da9fda91d26caf13bf5b5ccc74e8e8 upstream > >>> > >>> Some CPUs can speculate past an ERET instruction and potentially perform > >>> speculative accesses to memory before processing the exception return. > >>> Since the register state is often controlled by a lower privilege level > >>> at the point of an ERET, this could potentially be used as part of a > >>> side-channel attack. > >>> > >>> This patch emits an SB sequence after each ERET so that speculation is > >>> held up on exception return. > >>> > >>> Signed-off-by: Will Deacon > >>> [florian: Adjust hyp-entry.S to account for the label > >>> added change to hyp/entry.S] > >>> Signed-off-by: Florian Fainelli > >>> --- > >>> Changes in v2: > >>> > >>> - added missing hunk in hyp/entry.S per Will's feedback > >> > >> What about 4.19.y and 4.14.y trees? I can't take something for 4.9.y > >> and then have a regression if someone moves to a newer release, right? > > > > Sure, send you candidates for 4.14 and 4.19. > > Greg, did you have a chance to queue those changes for 4.9, 4.14 and 4.19? > > https://lore.kernel.org/linux-arm-kernel/20200720182538.13304-1-f.fainelli@gmail.com/ > https://lore.kernel.org/linux-arm-kernel/20200720182937.14099-1-f.fainelli@gmail.com/ > https://lore.kernel.org/linux-arm-kernel/20200709195034.15185-1-f.fainelli@gmail.com/ Nope, I was waiting for Will's "ack" for these. thanks, greg k-h _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel