linux-kernel - Re: [PATCH v1] fsnotify: Pass correct offset to fsnotify_mmap

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Message-ID: <edc832b4-5f4c-4f26-a306-954d65ec2e85@redhat.com>
Date: Mon, 6 Oct 2025 13:36:40 +0200
From: David Hildenbrand <david@...hat.com>
To: Ryan Roberts <ryan.roberts@....com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 "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>,
 Amir Goldstein <amir73il@...il.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v1] fsnotify: Pass correct offset to fsnotify_mmap_perm()

On 03.10.25 17:52, Ryan Roberts wrote:
> fsnotify_mmap_perm() requires a byte offset for the file about to be
> mmap'ed. But it is called from vm_mmap_pgoff(), which has a page offset.
> Previously the conversion was done incorrectly so let's fix it, being
> careful not to overflow on 32-bit platforms.
> 
> Discovered during code review.
> 
> Cc: <stable@...r.kernel.org>
> Fixes: 066e053fe208 ("fsnotify: add pre-content hooks on mmap()")
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>
> ---
> Applies against today's mm-unstable (aa05a436eca8).
>

Curious: is there some easy way to write a reproducer? Did you look into 
that?

LGTM, thanks

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers

David / dhildenb