linux-kernel - Re: [PATCH] workqueue: Add a new flag to spot the potential UAF error

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Date:   Wed, 14 Dec 2022 15:16:33 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     Richard Clark <richard.xnu.clark@...il.com>
Cc:     tj@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] workqueue: Add a new flag to spot the potential UAF error

On Tue, Dec 13, 2022 at 12:40 PM Richard Clark
<richard.xnu.clark@...il.com> wrote:
>
> Currently if the user queues a new work item unintentionally
> into a wq after the destroy_workqueue(wq), the work still can
> be queued and scheduled without any noticeable kernel message
> before the end of a RCU grace period.
>
> As a debug-aid facility, this commit adds a new flag
> __WQ_DESTROYING to spot that issue by triggering a kernel WARN
> message.
>
> Signed-off-by: Richard Clark <richard.xnu.clark@...il.com>

Reviewed-by: Lai Jiangshan <jiangshanlai@...il.com>