linux-kernel - [PATCH 3/9] drm/i915/selftests: Annotate struct perf_series with __counted

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Message-Id: <20230922173216.3823169-3-keescook@chromium.org>
Date:   Fri, 22 Sep 2023 10:32:08 -0700
From:   Kees Cook <keescook@...omium.org>
To:     David Airlie <airlied@...il.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
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        Andi Shyti <andi.shyti@...ux.intel.com>,
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Subject: [PATCH 3/9] drm/i915/selftests: Annotate struct perf_series 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 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 perf_series.

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

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: Chris Wilson <chris@...is-wilson.co.uk>
Cc: John Harrison <john.c.harrison@...el.com>
Cc: Andi Shyti <andi.shyti@...ux.intel.com>
Cc: Matthew Brost <matthew.brost@...el.com>
Cc: intel-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/gpu/drm/i915/selftests/i915_request.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/selftests/i915_request.c b/drivers/gpu/drm/i915/selftests/i915_request.c
index a9b79888c193..acae30a04a94 100644
--- a/drivers/gpu/drm/i915/selftests/i915_request.c
+++ b/drivers/gpu/drm/i915/selftests/i915_request.c
@@ -1924,7 +1924,7 @@ struct perf_stats {
 struct perf_series {
 	struct drm_i915_private *i915;
 	unsigned int nengines;
-	struct intel_context *ce[];
+	struct intel_context *ce[] __counted_by(nengines);
 };
 
 static int cmp_u32(const void *A, const void *B)
-- 
2.34.1