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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A6D9C433EF for ; Fri, 25 Feb 2022 01:10:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236275AbiBYBLF (ORCPT ); Thu, 24 Feb 2022 20:11:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232721AbiBYBLA (ORCPT ); Thu, 24 Feb 2022 20:11:00 -0500 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 76EA01ED4EB for ; Thu, 24 Feb 2022 17:10:29 -0800 (PST) Received: by mail-pl1-x634.google.com with SMTP id i1so3427172plr.2 for ; Thu, 24 Feb 2022 17:10:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=+qukDu2hliG7ObjC0OWtuj1Lxplxl2zZJPxYHSP6F6c=; b=NcbmMKlf5mzoy5eA24tSSETHUbiV0toqmg6GeSmb9ki9Uc9qj+grdPgCN6tBTuAwCZ 0x3EkuKXFV/sSbRkntxRYjXHjRqSFgezI6AJE34PUysl1DaDaTi8lGob0+GuRURHvH62 s2vKrQZeFVBkiffRqWBjn1KMDlAQCvQITmzyM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=+qukDu2hliG7ObjC0OWtuj1Lxplxl2zZJPxYHSP6F6c=; b=CdV/6/q/CDvCfNGnhHPwEfignv4xfYyyRIrVHEqUPwGq9+IPXQis9jFVRHW3hWD/Ua 6dg+9a8S/gIzLPnCRpxEEW/8DkspDJ0TN/PIopupylJ/VXNlO0U6DsNHALpvA7WvKZPM bHt2aiMKfc6xzrY4sZ0mIWindk9RmY6dCHMvBnstqgZPF/+GNbodgXOvBQrahhDRfqoV HQ3GG0lh77f3bKZh7v8sMHJiVpK/b+Xs9sOsUWP2n3IAR/rOHwgLdIn53x+BccRbVWMV Omy3THlBbLDR6hDfC5TtCoQ47c0TYW+6HHVzZ9ze3d7X2Zy0blM2LkTpBR3N1CrB5ZNS nnXA== X-Gm-Message-State: AOAM533rBEB+2n2tuJ7YERRFNPFac4EgXZqMO/xbgOMhSGnyp8CYmFCs ithve3LKhB98MEhbi0Q4QJKbjhZUeQUB/A== X-Google-Smtp-Source: ABdhPJy+6f3iiQDuwfxf03qoIYkDcIrjYYJxMsbm/A+pvT0/Ns+/ZEoH2RQ9lFDByPu+yo77+9RopQ== X-Received: by 2002:a17:902:cccc:b0:14e:e89c:c669 with SMTP id z12-20020a170902cccc00b0014ee89cc669mr5090327ple.58.1645751429023; Thu, 24 Feb 2022 17:10:29 -0800 (PST) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id c9-20020a655a89000000b003747b9ed5a1sm682783pgt.49.2022.02.24.17.10.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Feb 2022 17:10:28 -0800 (PST) Date: Thu, 24 Feb 2022 17:10:28 -0800 From: Kees Cook To: Peter Zijlstra Cc: x86@kernel.org, joao@overdrivepizza.com, hjl.tools@gmail.com, jpoimboe@redhat.com, andrew.cooper3@citrix.com, linux-kernel@vger.kernel.org, ndesaulniers@google.com, samitolvanen@google.com, mark.rutland@arm.com, alyssa.milburn@intel.com, mbenes@suse.cz, rostedt@goodmis.org, mhiramat@kernel.org, alexei.starovoitov@gmail.com Subject: Re: [PATCH v2 19/39] x86: Disable IBT around firmware Message-ID: <202202241710.FCC4328@keescook> References: <20220224145138.952963315@infradead.org> <20220224151323.129392410@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220224151323.129392410@infradead.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 24, 2022 at 03:51:57PM +0100, Peter Zijlstra wrote: > Assume firmware isn't IBT clean and disable it across calls. > > Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Kees Cook -- Kees Cook