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=-10.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 6ED2AC433DB for ; Mon, 22 Feb 2021 11:59:56 +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 0996A64E09 for ; Mon, 22 Feb 2021 11:59:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0996A64E09 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-Transfer-Encoding: Content-Type: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=3tvOx78e4UcVT245dUMgs3CjsPbTi/wPztjN0LeqeXc=; b=gBQPVPy88dskbSgtV1ktUHLEW FE5XUOhKddX7HiQuG37u8WUxRp1yyhU8sLu7nK2XqsttOYjulThkZaMmE+rMmwttOXouut0VI4Hhb TWyBi8EUCFSKvMEUBf/6tK+N/fAeO9mFD1NmuBIQ9rJKvZv+bP1R/yxSGg4MTgZoUXYbxZV9Y+c1M 7EohttzjpfdW13dGDWuzYzg+tuSHCwlbF/YbWLHL4LVjjp8uYuubbcCnoVfOW7ChxDYGGWB656nzU VvDjT4gg+dLkc6AZ3wYLKEemRyEV2sX5lxqQCTUOkcMcmTbkj70CZWhLaM2s+/LDcIf/VUXEwnVMi wkwTIVEBA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1lE9rE-0000Pd-0q; Mon, 22 Feb 2021 11:58:32 +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 1lE9r9-0000P9-Q0 for linux-arm-kernel@lists.infradead.org; Mon, 22 Feb 2021 11:58:30 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4914A64E15; Mon, 22 Feb 2021 11:58:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1613995104; bh=cX6+zcAFvYLB9KQP4npgFv9p/Y9T3UFAefLKaAVJ7cA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=MEtBdS+pzZVBPR9ZfrHvwUbU8LRoQz7FCSZ16Ws+XJQEGovFiXQj0n6bcaFJadohy QzV37B4gnkaa1wRZY0DBHM2Y9vYSwdb9ITEyVkeDkTnC/xPn9uextV4FkzGIcKWJR+ dJrUhg8x7sR8Okocjn0cLzGuy1nMW0YOTn2YiADr5DEtzNVlUiFi/dppws4uCUpbCr 2oQ/u39Uwjm1LWPZEISNNeZ7XtAZWPhrUdMINVz5qmj3v/mokXgde1++ClEeRllpdX YOJCy+1h9hqYCONnAjuzHHCJTgqWY14/Zep5CfTvo/Tlo1tyLMY22L1dG1zxP5RRR9 43oHdPbH9KTyQ== Date: Mon, 22 Feb 2021 11:58:16 +0000 From: Will Deacon To: Jian Cai Subject: Re: [PATCH v4] ARM: Implement SLS mitigation Message-ID: <20210222115816.GA8605@willie-the-truck> References: <20210219201852.3213914-1-jiancai@google.com> <20210219230841.875875-1-jiancai@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210219230841.875875-1-jiancai@google.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210222_065827_939539_B70FF649 X-CRM114-Status: GOOD ( 15.66 ) 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 , Catalin Marinas , Linus Walleij , James Morris , manojgupta@google.com, Ingo Molnar , Marc Zyngier , Masahiro Yamada , Russell King , Ard Biesheuvel , clang-built-linux@googlegroups.com, llozano@google.com, David Brazdil , "Serge E. Hallyn" , Kees Cook , Arnd Bergmann , Nathan Chancellor , linux-arm-kernel@lists.infradead.org, ndesaulniers@google.com, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, David Laight , James Morse , Andrew Morton , Andreas =?iso-8859-1?Q?F=E4rber?= , Mike Rapoport 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 Fri, Feb 19, 2021 at 03:08:13PM -0800, Jian Cai wrote: > This patch adds CONFIG_HARDEN_SLS_ALL that can be used to turn on > -mharden-sls=all, which mitigates the straight-line speculation > vulnerability, speculative execution of the instruction following some > unconditional jumps. Notice -mharden-sls= has other options as below, > and this config turns on the strongest option. > > all: enable all mitigations against Straight Line Speculation that are implemented. > none: disable all mitigations against Straight Line Speculation. > retbr: enable the mitigation against Straight Line Speculation for RET and BR instructions. > blr: enable the mitigation against Straight Line Speculation for BLR instructions. > > Links: > https://reviews.llvm.org/D93221 > https://reviews.llvm.org/D81404 > https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/downloads/straight-line-speculation > https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/frequently-asked-questions#SLS2 > > Suggested-by: Manoj Gupta > Suggested-by: Nick Desaulniers > Suggested-by: Nathan Chancellor > Suggested-by: David Laight > Suggested-by: Will Deacon > Reviewed-by: Nathan Chancellor > Signed-off-by: Jian Cai > --- Please can you reply to my previous questions? https://lore.kernel.org/linux-arm-kernel/20210217094859.GA3706@willie-the-truck/ (apologies if you did, but I don't see them in the archive or my inbox) Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel