linux-hardening - Re: [PATCH v2 55/63] HID: roccat: Use struct_group() to zero kone_mouse

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Message-ID: <202108200849.9EBF036376@keescook>
Date:   Fri, 20 Aug 2021 08:49:52 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Stefan Achatz <erazor_de@...rs.sourceforge.net>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input <linux-input@...r.kernel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>, linux-staging@...ts.linux.dev,
        linux-block <linux-block@...r.kernel.org>,
        linux-kbuild <linux-kbuild@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 55/63] HID: roccat: Use struct_group() to zero
 kone_mouse_event

On Fri, Aug 20, 2021 at 05:27:35PM +0200, Jiri Kosina wrote:
> On Fri, 20 Aug 2021, Kees Cook wrote:
> 
> > > > In preparation for FORTIFY_SOURCE performing compile-time and run-time
> > > > field bounds checking for memset(), avoid intentionally writing across
> > > > neighboring fields.
> > > >
> > > > Add struct_group() to mark region of struct kone_mouse_event that should
> > > > be initialized to zero.
> > > >
> > > > Cc: Stefan Achatz <erazor_de@...rs.sourceforge.net>
> > > > Cc: Jiri Kosina <jikos@...nel.org>
> > > > Cc: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> > > > Cc: linux-input@...r.kernel.org
> > > > Signed-off-by: Kees Cook <keescook@...omium.org>
> > >
> > > Applied, thank you Kees.
> > >
> > 
> > Eek! No, this will break the build: struct_group() is not yet in the tree.
> > I can carry this with an Ack, etc.
> 
> I was pretty sure I saw struct_group() already in linux-next, but that was 
> apparently a vacation-induced brainfart, sorry. Dropping.

Cool, no worries. Sorry for the confusion!

-- 
Kees Cook