linux-kernel - Re: [PATCH] ntfs3: prevent operations on NTFS system files

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Message-ID: <04bd83f8-2a34-4756-8309-8f2fbdb0f239@I-love.SAKURA.ne.jp>
Date: Tue, 14 Oct 2025 23:59:06 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: Deepanshu Kartikey <kartikey406@...il.com>
Cc: ntfs3@...ts.linux.dev, linux-kernel@...r.kernel.org,
        syzbot+3e58a7dc1a8c00243999@...kaller.appspotmail.com,
        almaz.alexandrovich@...agon-software.com
Subject: Re: [PATCH] ntfs3: prevent operations on NTFS system files

On 2025/10/14 23:39, Deepanshu Kartikey wrote:
> NTFS system files (inode numbers below MFT_REC_FREE) should not have
> their size modified by userspace as this can corrupt the filesystem.

Excuse me, but how can truncate operation succeed? As far as I tested,
truncate operation on files in $Extend directory fails even without your patch
( https://lkml.kernel.org/r/842b3b43-0a1c-4fe8-adff-94fdb2cee59b@I-love.SAKURA.ne.jp ).
Are there other NTFS system files which do not belong to $Extend directory?