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

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Date: Fri, 6 Oct 2023 22:47:15 +0200
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
 Jani Nikula <jani.nikula@...ux.intel.com>
Cc: 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

On 10/6/23 22:17, 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: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks!
-- 
Gustavo

> ---
>   drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
> index 6e22af31513a..c33210ead1ef 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
> @@ -96,7 +96,7 @@ struct ct_request {
>   struct ct_incoming_msg {
>   	struct list_head link;
>   	u32 size;
> -	u32 msg[];
> +	u32 msg[] __counted_by(size);
>   };
>   
>   enum { CTB_SEND = 0, CTB_RECV = 1 };