linux-hardening - [PATCH] wifi: brcmfmac: firmware: Annotate struct brcmf_fw_request with __counted

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Date:   Fri, 15 Sep 2023 13:05:52 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Arend van Spriel <aspriel@...il.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Kalle Valo <kvalo@...nel.org>,
        Matthias Brugger <mbrugger@...e.com>,
        Hector Martin <marcan@...can.st>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org
Subject: [PATCH] wifi: brcmfmac: firmware: Annotate struct brcmf_fw_request 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 brcmf_fw_request.

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

Cc: Arend van Spriel <aspriel@...il.com>
Cc: Franky Lin <franky.lin@...adcom.com>
Cc: Hante Meuleman <hante.meuleman@...adcom.com>
Cc: Kalle Valo <kvalo@...nel.org>
Cc: Matthias Brugger <mbrugger@...e.com>
Cc: Hector Martin <marcan@...can.st>
Cc: "Alvin Šipraga" <alsi@...g-olufsen.dk>
Cc: Hans de Goede <hdegoede@...hat.com>
Cc: linux-wireless@...r.kernel.org
Cc: brcm80211-dev-list.pdl@...adcom.com
Cc: SHA-cyfmac-dev-list@...ineon.com
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h
index 1266cbaee072..4002d326fd21 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h
@@ -69,7 +69,7 @@ struct brcmf_fw_request {
 	u16 bus_nr;
 	u32 n_items;
 	const char *board_types[BRCMF_FW_MAX_BOARD_TYPES];
-	struct brcmf_fw_item items[];
+	struct brcmf_fw_item items[] __counted_by(n_items);
 };
 
 struct brcmf_fw_name {
-- 
2.34.1