linux-kernel - Re: [PATCH 0/3] Modernize tasklet callback API

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Date:   Thu, 30 Jul 2020 11:14:50 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Allen Pais <allen.lkml@...il.com>,
        Oscar Carter <oscar.carter@....com>,
        Romain Perier <romain.perier@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-usb@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net,
        alsa-devel@...a-project.org, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH 0/3] Modernize tasklet callback API

[heavily trimmed CC list because I think lkml is ignoring this
thread...]

On Thu, Jul 30, 2020 at 09:03:55AM +0200, Thomas Gleixner wrote:
> Kees,
> 
> Kees Cook <keescook@...omium.org> writes:
> > This is the infrastructure changes to prepare the tasklet API for
> > conversion to passing the tasklet struct as the callback argument instead
> > of an arbitrary unsigned long. The first patch details why this is useful
> > (it's the same rationale as the timer_struct changes from a bit ago:
> > less abuse during memory corruption attacks, more in line with existing
> > ways of doing things in the kernel, save a little space in struct,
> > etc). Notably, the existing tasklet API use is much less messy, so there
> > is less to clean up.
> >
> > It's not clear to me which tree this should go through... Greg since it
> > starts with a USB clean-up, -tip for timer or interrupt, or if I should
> > just carry it. I'm open to suggestions, but if I don't hear otherwise,
> > I'll just carry it.
> >
> > My goal is to have this merged for v5.9-rc1 so that during the v5.10
> > development cycle the new API will be available. The entire tree of
> > changes is here[1] currently, but to split it up by maintainer the
> > infrastructure changes need to be landed first.
> >
> > Review and Acks appreciated! :)
> 
> I'd rather see tasklets vanish from the planet completely, but that's
> going to be a daring feat. So, grudgingly:

Understood! I will update the comments near the tasklet API.

> Acked-by: Thomas Gleixner <tglx@...utronix.de>

Thanks!

-- 
Kees Cook