linux-kernel - Re: [tip: x86/urgent] x86/uaccess: Improve performance by aligning writes to 8 bytes in copy_user

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

Message-ID: <Z-cemg4nGQDI3LXI@gmail.com>
Date: Fri, 28 Mar 2025 23:11:38 +0100
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-tip-commits@...r.kernel.org,
	Ondrej Lichtner <olichtne@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Herton R. Krzesinski" <herton@...hat.com>, x86@...nel.org
Subject: Re: [tip: x86/urgent] x86/uaccess: Improve performance by aligning
 writes to 8 bytes in copy_user_generic(), on non-FSRM/ERMS CPUs


Linus,

* tip-bot2 for Herton R. Krzesinski <tip-bot2@...utronix.de> wrote:

> The following commit has been merged into the x86/urgent branch of tip:
> 
> Commit-ID:     b5322b6ec06a6c58650f52abcd2492000396363b
> Gitweb:        https://git.kernel.org/tip/b5322b6ec06a6c58650f52abcd2492000396363b
> Author:        Herton R. Krzesinski <herton@...hat.com>
> AuthorDate:    Thu, 20 Mar 2025 11:22:13 -03:00
> Committer:     Ingo Molnar <mingo@...nel.org>
> CommitterDate: Fri, 28 Mar 2025 22:57:44 +01:00
> 
> x86/uaccess: Improve performance by aligning writes to 8 bytes in copy_user_generic(), on non-FSRM/ERMS CPUs
...

> [ mingo: Updated the changelog. ]
> 
> Fixes: ca96b162bfd2 ("x86: bring back rep movsq for user access on CPUs without ERMS")
> Fixes: 034ff37d3407 ("x86: rewrite '__copy_user_nocache' function")
> Reported-by: Ondrej Lichtner <olichtne@...hat.com>
> Co-developed-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Herton R. Krzesinski <herton@...hat.com>
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> Link: https://lore.kernel.org/r/20250320142213.2623518-1-herton@redhat.com

I have added in Linus's Signed-off-by tag, to make this SOB chain 
valid. Let me know if that's not OK.

Thanks,

	Ingo