linux-hardening - Re: [PATCH] drm/i915/guc: Annotate struct ct_incoming_msg with __counted

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Date: Fri, 6 Oct 2023 23:02:29 +0200
From: Andi Shyti <andi.shyti@...ux.intel.com>
To: Kees Cook <keescook@...omium.org>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	John Harrison <John.C.Harrison@...el.com>,
	Matthew Brost <matthew.brost@...el.com>,
	Michal Wajdeczko <michal.wajdeczko@...el.com>,
	Matt Roper <matthew.d.roper@...el.com>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-hardening@...r.kernel.org,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Tom Rix <trix@...hat.com>, Andi Shyti <andi.shyti@...ux.intel.com>,
	Nirmoy Das <nirmoy.das@...el.com>,
	Jonathan Cavitt <jonathan.cavitt@...el.com>,
	Fei Yang <fei.yang@...el.com>, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: Re: [PATCH] drm/i915/guc: Annotate struct ct_incoming_msg with
 __counted_by

Hi Kees,

On Fri, Oct 06, 2023 at 01:17:45PM -0700, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> As found with Coccinelle[1], add __counted_by for struct ct_incoming_msg.
> 
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: John Harrison <John.C.Harrison@...el.com>
> Cc: Matthew Brost <matthew.brost@...el.com>
> Cc: Michal Wajdeczko <michal.wajdeczko@...el.com>
> Cc: Matt Roper <matthew.d.roper@...el.com>
> Cc: intel-gfx@...ts.freedesktop.org
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-hardening@...r.kernel.org
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Andi Shyti <andi.shyti@...ux.intel.com> 

Andi