linux-hardening - [PATCH] wifi: ath10k: Annotate struct ath10k_ce_ring with __counted

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Date:   Fri, 15 Sep 2023 13:06:36 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Jeff Johnson <quic_jjohnson@...cinc.com>,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.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: ath10k: Annotate struct ath10k_ce_ring 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 ath10k_ce_ring.

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

Cc: Kalle Valo <kvalo@...nel.org>
Cc: Jeff Johnson <quic_jjohnson@...cinc.com>
Cc: ath10k@...ts.infradead.org
Cc: linux-wireless@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/net/wireless/ath/ath10k/ce.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/ce.h b/drivers/net/wireless/ath/ath10k/ce.h
index 666ce384a1d8..27367bd64e95 100644
--- a/drivers/net/wireless/ath/ath10k/ce.h
+++ b/drivers/net/wireless/ath/ath10k/ce.h
@@ -110,7 +110,7 @@ struct ath10k_ce_ring {
 	struct ce_desc_64 *shadow_base;
 
 	/* keep last */
-	void *per_transfer_context[];
+	void *per_transfer_context[] __counted_by(nentries);
 };
 
 struct ath10k_ce_pipe {
-- 
2.34.1