linux-kernel - [PATCH] wifi: wcn36xx: Annotate struct wcn36xx_hal_ind_msg with __counted

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Date:   Fri, 15 Sep 2023 13:06:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Loic Poulain <loic.poulain@...aro.org>
Cc:     Kees Cook <keescook@...omium.org>, Kalle Valo <kvalo@...nel.org>,
        wcn36xx@...ts.infradead.org, linux-wireless@...r.kernel.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] wifi: wcn36xx: Annotate struct wcn36xx_hal_ind_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 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 wcn36xx_hal_ind_msg.

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

Cc: Loic Poulain <loic.poulain@...aro.org>
Cc: Kalle Valo <kvalo@...nel.org>
Cc: wcn36xx@...ts.infradead.org
Cc: linux-wireless@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/net/wireless/ath/wcn36xx/smd.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/wcn36xx/smd.h b/drivers/net/wireless/ath/wcn36xx/smd.h
index cf15cde2a364..2c1ed9e570bf 100644
--- a/drivers/net/wireless/ath/wcn36xx/smd.h
+++ b/drivers/net/wireless/ath/wcn36xx/smd.h
@@ -47,7 +47,7 @@ struct wcn36xx_fw_msg_status_rsp {
 struct wcn36xx_hal_ind_msg {
 	struct list_head list;
 	size_t msg_len;
-	u8 msg[];
+	u8 msg[] __counted_by(msg_len);
 };
 
 struct wcn36xx;
-- 
2.34.1