Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.38 as permitted sender) client-ip=23.128.96.38;
From:   Kees Cook <keescook@chromium.org>
To:     David Airlie <airlied@gmail.com>
Cc:     Kees Cook <keescook@chromium.org>, Rob Clark <robdclark@gmail.com>,
        Abhinav Kumar <quic_abhinavk@quicinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Sean Paul <sean@poorly.run>,
        Marijn Suijten <marijn.suijten@somainline.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        Bjorn Andersson <andersson@kernel.org>,
        linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
        freedreno@lists.freedesktop.org, Emma Anholt <emma@anholt.net>,
        Evan Quan <evan.quan@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>,
        "Pan, Xinhui" <Xinhui.Pan@amd.com>,
        Xiaojian Du <Xiaojian.Du@amd.com>,
        Huang Rui <ray.huang@amd.com>,
        Kevin Wang <kevin1.wang@amd.com>,
        Hawking Zhang <Hawking.Zhang@amd.com>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
        Chris Wilson <chris@chris-wilson.co.uk>,
        John Harrison <john.c.harrison@Intel.com>,
        Andi Shyti <andi.shyti@linux.intel.com>,
        Matthew Brost <matthew.brost@intel.com>,
        Ben Skeggs <bskeggs@redhat.com>,
        Karol Herbst <kherbst@redhat.com>,
        Lyude Paul <lyude@redhat.com>,
        Maxime Ripard <mripard@kernel.org>,
        David Airlie <airlied@redhat.com>,
        Gerd Hoffmann <kraxel@redhat.com>,
        Gurchetan Singh <gurchetansingh@chromium.org>,
        Chia-I Wu <olvaffe@gmail.com>, Zack Rusin <zackr@vmware.com>,
        VMware Graphics Reviewers 
        <linux-graphics-maintainer@vmware.com>,
        Melissa Wen <mwen@igalia.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Tom Rix <trix@redhat.com>, Le Ma <le.ma@amd.com>,
        Lijo Lazar <lijo.lazar@amd.com>,
        Yifan Zhang <yifan1.zhang@amd.com>,
        Prike Liang <Prike.Liang@amd.com>, Lang Yu <Lang.Yu@amd.com>,
        Tejas Upadhyay <tejas.upadhyay@intel.com>,
        Nirmoy Das <nirmoy.das@intel.com>,
        Andrzej Hajda <andrzej.hajda@intel.com>,
        Neil Armstrong <neil.armstrong@linaro.org>,
        Kuogee Hsieh <quic_khsieh@quicinc.com>,
        linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org,
        intel-gfx@lists.freedesktop.org, nouveau@lists.freedesktop.org,
        virtualization@lists.linux-foundation.org, llvm@lists.linux.dev,
        linux-hardening@vger.kernel.org
Subject: [PATCH 4/9] drm/msm/dpu: Annotate struct dpu_hw_intr with __counted_by
Date:   Fri, 22 Sep 2023 10:32:09 -0700
Message-Id: <20230922173216.3823169-4-keescook@chromium.org>
In-Reply-To: <20230922173110.work.084-kees@kernel.org>
References: <20230922173110.work.084-kees@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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 checking 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 dpu_hw_intr.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Rob Clark <robdclark@gmail.com>
Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Sean Paul <sean@poorly.run>
Cc: Marijn Suijten <marijn.suijten@somainline.org>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Bjorn Andersson <andersson@kernel.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
index dab761e54863..50cf9523d367 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
@@ -61,7 +61,7 @@ struct dpu_hw_intr {
 		void (*cb)(void *arg, int irq_idx);
 		void *arg;
 		atomic_t count;
-	} irq_tbl[];
+	} irq_tbl[] __counted_by(total_irqs);
 };
 
 /**
-- 
2.34.1