From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0FFBC433DF for ; Sat, 11 Jul 2020 00:29:15 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8DA3C207BB for ; Sat, 11 Jul 2020 00:29:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ufZajBMf"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="rcoEfIMj" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8DA3C207BB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=AfAqZMvogDvCXKLQWfvK4CqG1NpTS/bZw3XcYpxfbD4=; b=ufZajBMfElE6/uEMy5ztwk77n DFRZoJHE6Ave+MBZXUoy8s+SrMktkU+eqPIqQQRJjsx5Y1skmB4jXKare1v+fbiUI6E5NV/CdR/pF frTKCPn8ci8Ys+a1pL6CNRCwKT7jCggZHqeZ0rziSL5PIjeShVQm63imfS5CBsQPrprjxQ/zt0iZ5 lXOMlDNjgpdJVI5QA48p2oqTuGYIx5bW1lg5MYCydU/S7K5vA00xjrm36RNxtyeH9ZaWmDxP8hnMS /g2GOLa9uwSgT8tLxla1D3zBNVcBcNJb0sWBVBLUCPCoJqkgHDxUjQ/Df6vPIQYB3KQ/yNQjOklbW fVDmQB/lQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ju3N8-0002SJ-8C; Sat, 11 Jul 2020 00:28:06 +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 1ju3N5-0002Rc-HW for linux-arm-kernel@lists.infradead.org; Sat, 11 Jul 2020 00:28:04 +0000 Received: from localhost (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (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 928E32078B; Sat, 11 Jul 2020 00:28:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594427282; bh=BRp8sZxnMGB3vpZ0E+ioDMibR1SlBT/gKwtr/pLNEYo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=rcoEfIMjSYOscAN4dOPiRCIwgHLNfsr7WG33Xmy4XgKSPX9fNs3pkh0AaMgqZdLtc LssjVDTYv0uJJtzW6DQThgD3hoW9QztI7ZtFZvf178SFjx1tBiMW5qHGFPnzn80fn4 gl3ywItY31zXbbTGkHz3MQJEXwCvCnACTvLT8/rI= Date: Fri, 10 Jul 2020 20:28:01 -0400 From: Sasha Levin To: Florian Fainelli Subject: Re: [PATCH stable v4.9 v2] arm64: entry: Place an SB sequence following an ERET instruction Message-ID: <20200711002801.GE2722994@sasha-vm> References: <20200709195034.15185-1-f.fainelli@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200709195034.15185-1-f.fainelli@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200710_202803_660997_7B9353D8 X-CRM114-Status: UNSURE ( 9.47 ) X-CRM114-Notice: Please train this message. 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 , Catalin Marinas , 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 , Marc Zyngier , Kristina Martsenko , Will Deacon , Ard Biesheuvel , linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 I've queued it up, thanks! -- Thanks, Sasha _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel