linux-hardening - Re: [PATCH] rapidio: Avoid bogus __alloc

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Message-ID: <20210910045010.GO1935@kadam>
Date:   Fri, 10 Sep 2021 07:50:10 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        kernel test robot <lkp@...el.com>,
        Matt Porter <mporter@...nel.crashing.org>,
        Alexandre Bounine <alex.bou9@...il.com>,
        Jing Xiangfeng <jingxiangfeng@...wei.com>,
        Ira Weiny <ira.weiny@...el.com>,
        John Hubbard <jhubbard@...dia.com>,
        Souptick Joarder <jrdr.linux@...il.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] rapidio: Avoid bogus __alloc_size warning

On Thu, Sep 09, 2021 at 06:52:27PM -0700, Kees Cook wrote:
> On Thu, Sep 09, 2021 at 04:11:09PM -0700, Andrew Morton wrote:
> > On Thu, 9 Sep 2021 15:51:23 -0700 Kees Cook <keescook@...omium.org> wrote:
> > 
> > > > That's an "error", not a warning.  Or is this thanks to the new -Werror?
> > > 
> > > This is a "regular" error (__bad_copy_to() uses __compiletime_error()).
> > > 
> > > > Either way, I'm inclined to cc:stable on this, because use of gcc-9 on
> > > > older kernels will be a common thing down the ages.
> > > > 
> > > > If it's really an "error" on non-Werror kernels then definitely cc:stable.
> > > 
> > > I would expect that as only being needed if __alloc_size was backported
> > > to -stable, which seems unlikely.
> > 
> > Ah.  Changelog didn't tell me that it's an __alloc_size thing.
> 
> Er, it's in the Subject, but I guess I could repeat it?
> 

This is how the email looks like to Andrew.

https://sylpheed.sraoss.jp/images/sylpheed2-mainwindow.png

Try to find the subject in that nonsense.  Same for everyone else on
email as well.

https://marc.info/?l=linux-kernel&m=163120404328790&w=2

I only either read the subject or the body of the commit message and
never both.  :P

regards,
dan carpenter