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Date: Fri,  6 Oct 2023 13:17:45 -0700
From: Kees Cook <keescook@...omium.org>
To: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Kees Cook <keescook@...omium.org>,
	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: [PATCH] drm/i915/guc: Annotate struct ct_incoming_msg with __counted_by

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>
---
 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 };
-- 
2.34.1


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