From: Eric Biggers <ebiggers@kernel.org>
To: Haimin Zhang <tcs.kernel@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
David Howells <dhowells@redhat.com>,
"Fabio M. De Francesco" <fmdefrancesco@gmail.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Haimin Zhang <tcs_kernel@tencent.com>,
TCS Robot <tcs_robot@tencent.com>
Subject: Re: [PATCH v2] fs/pipe: Deinitialize the watch_queue when pipe is freed
Date: Mon, 9 May 2022 13:50:25 -0700 [thread overview]
Message-ID: <Ynl+kUGRYaovLc8q@sol.localdomain> (raw)
In-Reply-To: <20220509131726.59664-1-tcs.kernel@gmail.com>
On Mon, May 09, 2022 at 09:17:26PM +0800, Haimin Zhang wrote:
> From: Haimin Zhang <tcs_kernel@tencent.com>
>
> Add a new function call to deinitialize the watch_queue of a freed pipe.
> When a pipe node is freed, it doesn't make pipe->watch_queue->pipe null.
> Later when function post_one_notification is called, it will use this
> field, but it has been freed and watch_queue->pipe is a dangling pointer.
> It makes a uaf issue.
> Check wqueu->defunct before pipe check since pipe becomes invalid once all
> watch queues were cleared.
>
> Reported-by: TCS Robot <tcs_robot@tencent.com>
> Signed-off-by: Haimin Zhang <tcs_kernel@tencent.com>
Is this fixing something? If so it should have a "Fixes" tag.
- Eric
next prev parent reply other threads:[~2022-05-09 20:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-09 13:17 [PATCH v2] fs/pipe: Deinitialize the watch_queue when pipe is freed Haimin Zhang
2022-05-09 20:50 ` Eric Biggers [this message]
2022-07-06 9:39 ` Lee Jones
2022-07-19 14:04 ` Lee Jones
2022-08-02 21:56 ` Eric Biggers
2022-08-09 15:38 ` Lee Jones
2022-08-09 18:06 ` Eric Biggers
2022-08-09 18:17 ` Lee Jones
2022-05-10 0:34 ` kernel test robot
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