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

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Message-ID: <g6gbj5ailv5q2olhhlgpgkr3vuolvbagpf3bff5pxqkpikerj7@qyix5rcdkzyw>
Date:   Wed, 4 Oct 2023 10:54:55 -0400
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     Wang Jinchao <wangjinchao@...sion.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

Hello,

On Thu, Sep 21, 2023 at 08:50:17AM +0800, Wang Jinchao wrote:
> 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?

Looks like you found a way here:

    https://lore.kernel.org/all/ZRTLHY5A+VqIKhA2@fedora/