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From: Greg KH <gregkh@linuxfoundation.org>
To: ZhengYuan Huang <gality369@gmail.com>
Cc: jaegeuk@kernel.org, chao@kernel.org, cm224.lee@samsung.com,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-kernel@vger.kernel.org, baijiaju1990@gmail.com,
	r33s3n6@gmail.com, zzzccc427@gmail.com, stable@vger.kernel.org
Subject: Re: [PATCH] f2fs: reject non-directory inode in f2fs_get_parent() to prevent null-ptr-deref
Date: Wed, 18 Mar 2026 11:08:01 +0100	[thread overview]
Message-ID: <2026031816-numbing-unsorted-f21d@gregkh> (raw)
In-Reply-To: <20260318090410.3368669-1-gality369@gmail.com>

On Wed, Mar 18, 2026 at 05:04:10PM +0800, ZhengYuan Huang wrote:
> [BUG]
> When accessing a crafted f2fs filesystem via open_by_handle_at(2), a
> KASAN null-pointer dereference is triggered deep inside the fscrypt
> inline-encryption path:

Does the f2fs fsck tool catch this issue when run on the corrupted
image?

> The bug is reproducible on next-20260313 with our dynamic
> metadata fuzzing tool that corrupts f2fs metadata at runtime.

That is not a valid threat model, sorry.  If you can modify a filesystem
image while it is mounted, this is the least of your worries :)

thanks,

greg k-h

  reply	other threads:[~2026-03-18 11:39 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-18  9:04 ZhengYuan Huang
2026-03-18 10:08 ` Greg KH [this message]
2026-03-19 10:34   ` ZhengYuan Huang

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