linux-cve-announce - Re: CVE-2023-52575: x86/srso: Fix SBPB enablement for spec_rstack

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2024042413-cartridge-caption-c667@gregkh>
Date: Wed, 24 Apr 2024 14:50:36 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Nikolay Borisov <nik.borisov@...e.com>
Cc: cve@...nel.org, linux-kernel@...r.kernel.org,
	linux-cve-announce@...r.kernel.org, Michal Hocko <mhocko@...e.com>
Subject: Re: CVE-2023-52575: x86/srso: Fix SBPB enablement for
 spec_rstack_overflow=off

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