linux-kernel - [PATCH v2] wifi: p54: Annotate struct p54_cal_database with __counted

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Message-Id: <20231009161028.it.544-kees@kernel.org>
Date:   Mon,  9 Oct 2023 09:10:35 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Christian Lamparter <chunkeey@...glemail.com>
Cc:     Kees Cook <keescook@...omium.org>, Kalle Valo <kvalo@...nel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-wireless@...r.kernel.org, linux-hardening@...r.kernel.org,
        Jason Andryuk <jandryuk@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: [PATCH v2] wifi: p54: Annotate struct p54_cal_database 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 via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

Add __counted_by for struct p54_cal_database.

Cc: Christian Lamparter <chunkeey@...glemail.com>
Cc: Kalle Valo <kvalo@...nel.org>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-wireless@...r.kernel.org
Cc: linux-hardening@...r.kernel.org
Suggested-by: Jason Andryuk <jandryuk@...il.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
v1 - https://lore.kernel.org/all/20231006201719.work.356-kees@kernel.org/
v2 - use the correct member (jandryuk)
---
 drivers/net/wireless/intersil/p54/p54.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intersil/p54/p54.h b/drivers/net/wireless/intersil/p54/p54.h
index 3356ea708d81..522656de4159 100644
--- a/drivers/net/wireless/intersil/p54/p54.h
+++ b/drivers/net/wireless/intersil/p54/p54.h
@@ -126,7 +126,7 @@ struct p54_cal_database {
 	size_t entry_size;
 	size_t offset;
 	size_t len;
-	u8 data[];
+	u8 data[] __counted_by(len);
 };
 
 #define EEPROM_READBACK_LEN 0x3fc
-- 
2.34.1