linux-hardening - Re: [PATCH v2 12/63] thermal: intel: int340x_thermal: Use struct

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Date:   Wed, 24 Nov 2021 14:33:38 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "open list:NETWORKING DRIVERS (WIRELESS)" 
        <linux-wireless@...r.kernel.org>, netdev <netdev@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-staging@...ts.linux.dev, linux-block@...r.kernel.org,
        linux-kbuild@...r.kernel.org, clang-built-linux@...glegroups.com,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 12/63] thermal: intel: int340x_thermal: Use
 struct_group() for memcpy() region

On Wed, Nov 24, 2021 at 12:53 AM Srinivas Pandruvada
<srinivas.pandruvada@...ux.intel.com> wrote:
>
> On Tue, 2021-11-23 at 14:19 +0100, Rafael J. Wysocki wrote:
> > On Wed, Aug 18, 2021 at 8:08 AM Kees Cook <keescook@...omium.org>
> > wrote:
> > >
> > > In preparation for FORTIFY_SOURCE performing compile-time and run-
> > > time
> > > field bounds checking for memcpy(), avoid intentionally writing
> > > across
> > > neighboring fields.
> > >
> > > Use struct_group() in struct art around members weight, and ac[0-
> > > 9]_max,
> > > so they can be referenced together. This will allow memcpy() and
> > > sizeof()
> > > to more easily reason about sizes, improve readability, and avoid
> > > future
> > > warnings about writing beyond the end of weight.
> > >
> > > "pahole" shows no size nor member offset changes to struct art.
> > > "objdump -d" shows no meaningful object code changes (i.e. only
> > > source
> > > line number induced differences).
> > >
> > > Cc: Zhang Rui <rui.zhang@...el.com>
> > > Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> > > Cc: Amit Kucheria <amitk@...nel.org>
> > > Cc: linux-pm@...r.kernel.org
> > > Signed-off-by: Kees Cook <keescook@...omium.org>
> >
> > Rui, Srinivas, any comments here?
> Looks good.
> Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

Applied as 5.17 material, thank you!