From: Kees Cook <keescook@chromium.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: Kees Cook <keescook@chromium.org>, Lee Jones <lee@kernel.org>,
linux-leds@vger.kernel.org, Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Tom Rix <trix@redhat.com>,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
linux-hardening@vger.kernel.org
Subject: [PATCH] leds: aw200xx: Annotate struct aw200xx with __counted_by
Date: Fri, 15 Sep 2023 13:09:39 -0700 [thread overview]
Message-ID: <20230915200938.never.767-kees@kernel.org> (raw)
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 aw200xx.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Lee Jones <lee@kernel.org>
Cc: linux-leds@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/leds/leds-aw200xx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c
index 691a743cc9b0..4d517cace3e7 100644
--- a/drivers/leds/leds-aw200xx.c
+++ b/drivers/leds/leds-aw200xx.c
@@ -112,7 +112,7 @@ struct aw200xx {
struct mutex mutex;
u32 num_leds;
u32 display_rows;
- struct aw200xx_led leds[];
+ struct aw200xx_led leds[] __counted_by(num_leds);
};
static ssize_t dim_show(struct device *dev, struct device_attribute *devattr,
--
2.34.1
next reply other threads:[~2023-09-15 20:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-15 20:09 Kees Cook [this message]
2023-09-15 20:46 ` [PATCH] leds: aw200xx: Annotate struct aw200xx with __counted_by Gustavo A. R. Silva
2023-09-20 13:35 ` (subset) " Lee Jones
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