linux-kernel - Re: Issue: padata: UAF in padata_serial

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Date:   Thu, 21 Sep 2023 08:50:17 +0800
From:   Wang Jinchao <wangjinchao@...sion.com>
To:     Daniel Jordan <daniel.m.jordan@...cle.com>
CC:     Steffen Klassert <steffen.klassert@...unet.com>,
        <linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <nstange@...e.de>, <tangqingmei@...sion.com>,
        <stone.xulei@...sion.com>
Subject: Re: Issue: padata: UAF in padata_serial_worker reproduce

On Mon, Sep 18, 2023 at 09:21:59AM -0400, Daniel Jordan wrote:
> Hi,
> 
> On Mon, Sep 18, 2023 at 02:27:34PM +0800, Wang Jinchao wrote:
> > Hello, I have reproduced the issue mentioned by Nicolai Stange on an arm64 server.
> > After applying Nicolai Stange's patch, the issue did not reoccur even after running for two days.
> > The test tools used were ltp20220121 and stress-ng-0.15.06.tar.gz.
> > 
> > refurl: https://lore.kernel.org/all/20221028160401.cccypv4euxikusiq@parnassus.localdomain/T/#u
> 
> Yeah, this series seems close to being finished, just hasn't made it
> over the finish line quite yet.  I wonder if Nicolai has plans to
> ressurect or whether someone else should take it over.

Hello, I'd like to inquire about something:

Since users of padata_free_shell need to ensure that all tasks in padata_shell have completed, 
how can they confirm this when they are uncertain? Would it be better if Padata provided a mechanism, 
such as padata_shell_status(), to maintain statistics like the number of tasks?

Thanks