linux-kernel - Re: Stable linux-5.10.x regression triggered by MDS mitigation

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 for Android: free password hash cracker in your pocket

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

Message-ID: <eK0mvc1FJknv3ZTg6opsYgeqRGgQCTFIQ-gdp5k0KdB3EsY-dL7cKmKvsG93qcTKvPQhrjkbRTrI32YK-AqMXcqiKqLetkLeDnn_b5qs7AA=@protonmail.com>
Date: Wed, 26 Jun 2024 13:02:35 +0000
From: Jari Ruusu <jariruusu@...tonmail.com>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Stable linux-5.10.x regression triggered by MDS mitigation

On Tuesday, June 25th, 2024 at 21:01, Pawan Gupta <pawan.kumar.gupta@...ux.intel.com> wrote:
> Thanks for pointing this out, CLEAR_CPU_BUFFERS should happen before POPFL.
> Below patch moves it before POPFL and also adds a safer version that
> switches to KERNEL_DS before executing VERW. This should ensure VERW works
> in all cases:

Your patch looks OK to me. Thanks.
Tested on linux-5.10.220 inside 32-bit VM.

--
Jari Ruusu  4096R/8132F189 12D6 4C3A DCDA 0AA4 27BD  ACDF F073 3C80 8132 F189