linux-kernel - Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data

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Date:   Thu, 31 Aug 2017 16:59:05 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        intel-wired-lan@...ts.osuosl.org, netdev <netdev@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 31/31] timer: Switch to testing for .function instead of .data

On Thu, Aug 31, 2017 at 4:45 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> On Thu, Aug 31, 2017 at 4:29 PM, Kees Cook <keescook@...omium.org> wrote:
>> In several places, .data is checked for initialization to gate early
>> calls to del_timer_sync(). Checking for .function is equally valid, so
>> switch to this in all callers.
>
> Not seeing the rest of patches it is unclear from the patch
> description why this is needed/wanted.

The CC list would have been really giant, but here is the first patch
and the earlier series list:

https://lkml.org/lkml/2017/8/31/904
https://lkml.org/lkml/2017/8/30/760

tl;dr: We're going to switch all struct timer_list callbacks to get
the timer pointer as the argument instead of from the .data field.
This patch is one step in removing open-coded users of the .data
field.

-Kees

-- 
Kees Cook
Pixel Security