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Message-Id: <20231006201715.work.239-kees@kernel.org> Date: Fri, 6 Oct 2023 13:17:15 -0700 From: Kees Cook <keescook@...omium.org> To: Ping-Ke Shih <pkshih@...ltek.com> Cc: Kees Cook <keescook@...omium.org>, Kalle Valo <kvalo@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>, linux-wireless@...r.kernel.org, linux-hardening@...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 Subject: [PATCH] wifi: rtw89: coex: Annotate struct rtw89_btc_btf_set_slot_table 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 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 rtw89_btc_btf_set_slot_table. Cc: Ping-Ke Shih <pkshih@...ltek.com> Cc: Kalle Valo <kvalo@...nel.org> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org> Cc: linux-wireless@...r.kernel.org Cc: linux-hardening@...r.kernel.org Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook <keescook@...omium.org> --- drivers/net/wireless/realtek/rtw89/coex.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/realtek/rtw89/coex.c b/drivers/net/wireless/realtek/rtw89/coex.c index 4ba8b3df70ae..d66a1152c3f5 100644 --- a/drivers/net/wireless/realtek/rtw89/coex.c +++ b/drivers/net/wireless/realtek/rtw89/coex.c @@ -237,7 +237,7 @@ struct rtw89_btc_btf_set_report { struct rtw89_btc_btf_set_slot_table { u8 fver; u8 tbl_num; - u8 buf[]; + u8 buf[] __counted_by(tbl_num); } __packed; struct rtw89_btc_btf_set_mon_reg { -- 2.34.1
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