linux-kernel - Re: MREMAP_DONTUNMAP corrupts initial mapping

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Message-ID: <38c80313-ba1c-092c-ae31-f58fe6ffa82c@yandex.ru>
Date:   Thu, 30 Mar 2023 19:45:14 +0500
From:   stsp <stsp2@...dex.ru>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     linux-mm@...ck.org, Brian Geffon <bgeffon@...gle.com>,
        Li Xinhai <lixinhai.lxh@...il.com>,
        Dmitry Safonov <0x7f454c46@...il.com>
Subject: Re: MREMAP_DONTUNMAP corrupts initial mapping

Add a few CCs.

30.03.2023 17:38, stsp пишет:
> Hello.
>
> Attached is a small test-case that
> demonstrates the problem.
> The problem happens if you change
> some data in a file-backed private
> mapping and then use mremap on
> it with MREMAP_DONTUNMAP flag.
> The result is:
> - destination copy is valid
> - source copy restored from the original file
>
> So the 2 copies do not match.