From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4B65015747E; Wed, 24 Apr 2024 21:50:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713995445; cv=none; b=ZhT5pKjtYkz3s+aFIobIvysgYyJw6qqvaewHtRltEQPbg1K6kUaF8sx0a5kF6K3wcgEVW/o5cjxn1XmS0mKjex+IP+rhfs9aEfZG9uhMZl80WGuFvb2B+1H12OBfQR1XkVtCgf8d2EokxCF36ctqMmM3CXl3CdXO21500Fn7VzU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713995445; c=relaxed/simple; bh=V1amWpZY8vykBiXYDi7oosr0+oJ0Di6hNW14BZEqcdI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=BRPqummhN+Q1RdqNrkkNJinPnqv/lH6SGTS1CMCGr3GpKP03In8JqHOL/teFtG5JpiPxE9JV16XnePz62rofK2uBme0vZb5aNdS3Lp0hAy8AGywmR6/dvlTwzOx34z5nQim6j4Td2eGXHrND0tZqOIv33vvvBVkdu1uFMobjHxY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=dFrygewd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="dFrygewd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 155DFC2BD11; Wed, 24 Apr 2024 21:50:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1713995445; bh=V1amWpZY8vykBiXYDi7oosr0+oJ0Di6hNW14BZEqcdI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=dFrygewdaAl+dA9kc9noio0QC9oJBMJiPRHGUN82W0m8iahrZQq651uWNbtpnR2UX xV3Ijb8cRMqTqYA9XGm7cpdjOopd8U3TFKNsmNAeGZ3wE0caPhgSp4XeBfSco25NRh FRQ7YhOVVBEqQL5MsTyYJMOrjwts1fp8bruf2eXA= Date: Wed, 24 Apr 2024 14:50:36 -0700 From: Greg Kroah-Hartman To: Nikolay Borisov Cc: cve@kernel.org, linux-kernel@vger.kernel.org, linux-cve-announce@vger.kernel.org, Michal Hocko Subject: Re: CVE-2023-52575: x86/srso: Fix SBPB enablement for spec_rstack_overflow=off Message-ID: <2024042413-cartridge-caption-c667@gregkh> References: <2024030256-CVE-2023-52575-34bf@gregkh> <7c1dda50-2155-4b3c-8a87-b8669b077b30@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <7c1dda50-2155-4b3c-8a87-b8669b077b30@suse.com> On Mon, Apr 22, 2024 at 01:00:18PM +0200, Nikolay Borisov wrote: > > > On 2.03.24 г. 23:00 ч., Greg Kroah-Hartman wrote: > > Description > > =========== > > > > In the Linux kernel, the following vulnerability has been resolved: > > > > x86/srso: Fix SBPB enablement for spec_rstack_overflow=off > > > > If the user has requested no SRSO mitigation, other mitigations can use > > the lighter-weight SBPB instead of IBPB. > > > > The Linux kernel CVE team has assigned CVE-2023-52575 to this issue. > > I'd like to dispute this as this isn't a CVE but a mere performance > optimization in case spec_rstack_overflow is disabled. Without this patch in > case spec_rstack_overflow is disabled the kernel will simply use the heavier > ibpb but that won't have effect on correctness. You are right, our fault. I'll go reject this CVE now, thanks for the review! greg k-h