linux-hardening - Re: [PATCH] pstore/ram: Convert to platform remove callback returning void

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230509082532.ppnc6pyve5oqgh4u@pengutronix.de>
Date:   Tue, 9 May 2023 10:25:32 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Kees Cook <keescook@...omium.org>
Cc:     "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Tony Luck <tony.luck@...el.com>,
        linux-hardening@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH] pstore/ram: Convert to platform remove callback
 returning void

Hello Kees,

On Sat, Apr 08, 2023 at 10:10:07AM +0200, Uwe Kleine-König wrote:
> On Thu, Apr 06, 2023 at 03:50:49PM -0700, Kees Cook wrote:
> > On Thu, Apr 06, 2023 at 12:57:30PM -0300, Guilherme G. Piccoli wrote:
> > > On 01/04/2023 09:00, Uwe Kleine-König wrote:
> > > > The .remove() callback for a platform driver returns an int which makes
> > > > many driver authors wrongly assume it's possible to do error handling by
> > > > returning an error code. However the value returned is (mostly) ignored
> > > > and this typically results in resource leaks. To improve here there is a
> > > > quest to make the remove callback return void. In the first step of this
> > > > quest all drivers are converted to .remove_new() which already returns
> > > > void.
> > > > 
> > > > Trivially convert this driver from always returning zero in the remove
> > > > callback to the void returning variant.
> > > > 
> > > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> > > 
> > > Thanks, it makes sense for me! Code-wise, it looks fine.
> > > 
> > > What would be interesting it to mention a mail thread discussing this or
> > > maybe the patch itself that added the .remove_new() idea
> > > [https://git.kernel.org/linus/5c5a7680e67b right?].
> > > 
> > > BTW, nice idea - converting all at once would be a terrible sync effort,
> > > I guess this way things will go smoothly.
> > > Feel free to add my:
> > > 
> > > Reviewed-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
> > 
> > Thanks! Looks good to me.
> > 
> > Acked-by: Kees Cook <keescook@...omium.org>
> > 
> > Do you want to take these view some other tree, or should I take this
> > via my pstore tree?
> 
> Take it via your tree please. There are still >1000 drivers to convert,
> so I guess this patch will be in Linus' tree long before I can convert
> struct platform_driver.

This patch didn't make it into v6.4-rc1, is it still on your radar to
queue it for the next merge window?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)