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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id ji2-20020a170903324200b001c75f94b0b0sm4333924plb.213.2023.10.06.13.21.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Oct 2023 13:21:14 -0700 (PDT) Date: Fri, 6 Oct 2023 13:21:13 -0700 From: Kees Cook To: Felix Fietkau , Kalle Valo Cc: Lorenzo Bianconi , Ryder Lee , Shayne Chen , Sean Wang , Matthias Brugger , AngeloGioacchino Del Regno , linux-wireless@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Nathan Chancellor , Nick Desaulniers , Tom Rix , linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: Re: [PATCH] wifi: mt76: Annotate struct mt76_rx_tid with __counted_by Message-ID: <202310061320.8630F7E51@keescook> References: <20230915200612.never.786-kees@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230915200612.never.786-kees@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org On Fri, Sep 15, 2023 at 01:06:12PM -0700, Kees Cook wrote: > 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. Friendly ping. Can this get picked up by the wifi tree, or should it go via something else? Thanks! -Kees > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Felix Fietkau > Cc: Lorenzo Bianconi > Cc: Ryder Lee > Cc: Shayne Chen > Cc: Sean Wang > Cc: Kalle Valo > Cc: Matthias Brugger > Cc: AngeloGioacchino Del Regno > Cc: linux-wireless@vger.kernel.org > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-mediatek@lists.infradead.org > Signed-off-by: Kees Cook > --- > 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 > -- Kees Cook