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Message-Id: <20230922175215.work.122-kees@kernel.org>
Date: Fri, 22 Sep 2023 10:52:15 -0700
From: Kees Cook <keescook@...omium.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Kees Cook <keescook@...omium.org>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Claudiu Beznea <claudiu.beznea@...on.dev>,
linux-arm-kernel@...ts.infradead.org,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: [PATCH] memory: atmel-ebi: Annotate struct atmel_ebi_dev 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 atmel_ebi_dev.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: Claudiu Beznea <claudiu.beznea@...on.dev>
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/memory/atmel-ebi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/memory/atmel-ebi.c b/drivers/memory/atmel-ebi.c
index 635966d705cb..ec6100bc94c5 100644
--- a/drivers/memory/atmel-ebi.c
+++ b/drivers/memory/atmel-ebi.c
@@ -30,7 +30,7 @@ struct atmel_ebi_dev {
struct atmel_ebi *ebi;
u32 mode;
int numcs;
- struct atmel_ebi_dev_config configs[];
+ struct atmel_ebi_dev_config configs[] __counted_by(numcs);
};
struct atmel_ebi_caps {
--
2.34.1
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