linux-kernel - [PATCH] wifi: mt76: Annotate struct mt76_rx_tid with __counted

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Date:   Fri, 15 Sep 2023 13:06:12 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Felix Fietkau <nbd@....name>
Cc:     Kees Cook <keescook@...omium.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Shayne Chen <shayne.chen@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Kalle Valo <kvalo@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-wireless@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...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] wifi: mt76: Annotate struct mt76_rx_tid 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 mt76_rx_tid.

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

Cc: Felix Fietkau <nbd@....name>
Cc: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: Ryder Lee <ryder.lee@...iatek.com>
Cc: Shayne Chen <shayne.chen@...iatek.com>
Cc: Sean Wang <sean.wang@...iatek.com>
Cc: Kalle Valo <kvalo@...nel.org>
Cc: Matthias Brugger <matthias.bgg@...il.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: linux-wireless@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-mediatek@...ts.infradead.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/net/wireless/mediatek/mt76/mt76.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index e8757865a3d0..03ef617b1527 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -376,7 +376,7 @@ struct mt76_rx_tid {
 
 	u8 started:1, stopped:1, timer_pending:1;
 
-	struct sk_buff *reorder_buf[];
+	struct sk_buff *reorder_buf[] __counted_by(size);
 };
 
 #define MT_TX_CB_DMA_DONE		BIT(0)
-- 
2.34.1