From: Tejun Heo <tj@kernel.org>
To: "Christian A. Ehrhardt" <lk@c--e.de>
Cc: linux-kernel@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v2] kernfs: fix use-after-free in __kernfs_remove
Date: Mon, 19 Sep 2022 07:35:34 -1000 [thread overview]
Message-ID: <YyioZk1fLVFZHWwn@slm.duckdns.org> (raw)
In-Reply-To: <20220913121723.691454-1-lk@c--e.de>
On Tue, Sep 13, 2022 at 02:17:23PM +0200, Christian A. Ehrhardt wrote:
> Syzkaller managed to trigger concurrent calls to
> kernfs_remove_by_name_ns() for the same file resulting in
> a KASAN detected use-after-free. The race occurs when the root
> node is freed during kernfs_drain().
>
> To prevent this acquire an additional reference for the root
> of the tree that is removed before calling __kernfs_remove().
...
> cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> cc: Tejun Heo <tj@kernel.org>
> Signed-off-by: Christian A. Ehrhardt <lk@c--e.de>
Acked-by: Tejun Heo <tj@kernel.org>
Thanks.
--
tejun
prev parent reply other threads:[~2022-09-19 17:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-07 20:08 [PATCH] kernfs: fix use-after-free in __kernfs_remove Christian A. Ehrhardt
2022-09-08 17:14 ` Tejun Heo
2022-09-08 22:25 ` Christian A. Ehrhardt
2022-09-12 21:24 ` Christian A. Ehrhardt
2022-09-12 21:39 ` Tejun Heo
2022-09-13 12:17 ` [PATCH v2] " Christian A. Ehrhardt
2022-09-19 17:35 ` Tejun Heo [this message]
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