linux-kernel - Re: [PATCH 5.4.y 0/3] Backport series: "permit write-sealed memfd read-only shared mappings"

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Message-ID: <aIl1AbmESlTruw7K@casper.infradead.org>
Date: Wed, 30 Jul 2025 02:27:29 +0100
From: Matthew Wilcox <willy@...radead.org>
To: "Isaac J. Manjarres" <isaacmanjarres@...gle.com>
Cc: lorenzo.stoakes@...cle.com, gregkh@...uxfoundation.org,
	Muchun Song <muchun.song@...ux.dev>,
	Oscar Salvador <osalvador@...e.de>,
	David Hildenbrand <david@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>, Kees Cook <kees@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Jann Horn <jannh@...gle.com>, Pedro Falcato <pfalcato@...e.de>,
	Hugh Dickins <hughd@...gle.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>, aliceryhl@...gle.com,
	stable@...r.kernel.org, kernel-team@...roid.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 5.4.y 0/3] Backport series: "permit write-sealed memfd
 read-only shared mappings"

On Tue, Jul 29, 2025 at 05:58:05PM -0700, Isaac J. Manjarres wrote:
> Lorenzo's series [2] fixed that issue and was merged in kernel version
> 6.7, but was not backported to older kernels. So, this issue is still
> present on kernels 5.4, 5.10, 5.15, 6.1, and 6.6.
> 
> This series backports Lorenzo's series to the 5.4 kernel.

That's not how this works.  First you do 6.6, then 6.1, then 5.15 ...

Otherwise somebody might upgrade from 5.4 to 6.1 and see a regression.