Re: [PATCH v3 09/10] mm/mremap: permit mremap() move of multiple VMAs

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To: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH v3 09/10] mm/mremap: permit mremap() move of multiple VMAs
From: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Date: Wed, 16 Jul 2025 20:36:24 +0100
Cc: Peter Xu <peterx@xxxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, "Liam R . Howlett" <Liam.Howlett@xxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Pedro Falcato <pfalcato@xxxxxxx>, Rik van Riel <riel@xxxxxxxxxxx>, linux-mm@xxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx
In-reply-to: <8f41e72b0543953d277e96d5e67a52f287cdbac3.1752232673.git.lorenzo.stoakes@oracle.com>

Hi Andrew,

Just a quick fix to address issues raised by syzkaller. I removed this code
previously based on misinterpreting review feedback as indicating that I
could do so...

In any case I have tested this against the repro (a well-placed RCU barrier
causes reliable repro it turns out) and confirmed it fixes the issue.

Thanks, Lorenzo

----8<----

References:
- [PATCH v3 00/10] mm/mremap: permit mremap() move of multiple VMAs
  - From: Lorenzo Stoakes
- [PATCH v3 09/10] mm/mremap: permit mremap() move of multiple VMAs
  - From: Lorenzo Stoakes

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