linux-kernel - [PATCH] staging: rtl8192e: Annotate struct rtllib_txb with __counted

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Message-Id: <20230817204523.never.034-kees@kernel.org>
Date:   Thu, 17 Aug 2023 13:45:24 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Philipp Hortmann <philipp.g.hortmann@...il.com>,
        linux-staging@...ts.linux.dev,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Yogesh Hegde <yogi.kernel@...il.com>,
        Sumitra Sharma <sumitraartsy@...il.com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org
Subject: [PATCH] staging: rtl8192e: Annotate struct rtllib_txb 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 rtllib_txb.

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

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Philipp Hortmann <philipp.g.hortmann@...il.com>
Cc: linux-staging@...ts.linux.dev
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/staging/rtl8192e/rtllib.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8192e/rtllib.h b/drivers/staging/rtl8192e/rtllib.h
index c5a692dfcd17..543d8671281d 100644
--- a/drivers/staging/rtl8192e/rtllib.h
+++ b/drivers/staging/rtl8192e/rtllib.h
@@ -818,7 +818,7 @@ struct rtllib_txb {
 	u16 reserved;
 	__le16 frag_size;
 	__le16 payload_size;
-	struct sk_buff *fragments[];
+	struct sk_buff *fragments[] __counted_by(nr_frags);
 };
 
 #define MAX_SUBFRAME_COUNT		  64
-- 
2.34.1