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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id v8-20020a17090331c800b00199023c688esm2481518ple.26.2023.02.09.21.43.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Feb 2023 21:43:15 -0800 (PST) From: Kees Cook To: Kalle Valo Cc: Kees Cook , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] wifi: ath: Silence memcpy run-time false positive warning Date: Thu, 9 Feb 2023 21:43:13 -0800 Message-Id: <20230210054310.never.554-kees@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2274; h=from:subject:message-id; bh=HpKo9sTr/HDvjHRUnQNbbmtTY7h1S1HI2SjgTQu+PF0=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBj5dlx5/oUi2b864PAZJA2tYIlXO8n8wbWjG+PlQly 9C7XAsyJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCY+XZcQAKCRCJcvTf3G3AJlZzD/ 9+QfS5oxR9/4Qs0yKAwtDcjvnug1MfW4BnEtT2afvu7iPZkrCDin60lTjPGTN4vglnrMWT6afqpXnB XHgLTZj2ahcVuOQLBAF9mPTqGZYFEWYMLcqakJ2hKGbtM2MpzjEYSfnGbfk08ATNfrrC9vmHuk1Hce xcVxtBS1ehTzBqZBnCBzV386ODKpzGPsVezLVFr0b0hB86eQNAC0pW7cC6stmrpk5U8cyCTv20dZuZ PJkFEBjLOQZuuzP0V8BCZ867TU/el8Bx3w1/F8Ce3bkO/Km4WQBLJ5+rBMPwsLYWsTdrhDqdu3euTe Bhp89FnehAlsKcXvPnLHys4JZWQ5s1/wupi0YapBpwtlTaGioAeuKXEJzZebafhBWdv7XtQN6PogwP lvSu5npSmpiQj8iytbaqxBptNCQCmZYnhv2z9UFLBkvj1L3dZ9feb5jEU+nVwbL3jJa/D1DaP8U3Kc 2ZzjO/UrTknTbD0H4ctE/3jt/Ya1qsDBg2/JLVYrRne8C65le2FKflS229RM8Yb/IaMUarTPoHX6Pq 8Go0XC4epyRU13nhw/0ZnydH+ugnE9KAroC++PaLXm7AYp1ste2SnMkQyKGQZJ3jgv33xMXlxEaveo PE1rh9N3Ycjh+pdBdVCzJrUR4MAtEoCFKpudfDhRQge812Fsl2prEPkk5bCA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org The memcpy() in ath_key_config() was attempting to write across neighboring struct members in struct ath_keyval. Introduce a wrapping struct_group, kv_values, to be the addressable target of the memcpy without overflowing an individual member. Silences the false positive run-time warning: memcpy: detected field-spanning write (size 32) of single field "hk.kv_val" at drivers/net/wireless/ath/key.c:506 (size 16) Link: https://bbs.archlinux.org/viewtopic.php?id=282254 Cc: Kalle Valo Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- drivers/net/wireless/ath/ath.h | 12 +++++++----- drivers/net/wireless/ath/key.c | 2 +- 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h index f083fb9038c3..f02a308a9ffc 100644 --- a/drivers/net/wireless/ath/ath.h +++ b/drivers/net/wireless/ath/ath.h @@ -96,11 +96,13 @@ struct ath_keyval { u8 kv_type; u8 kv_pad; u16 kv_len; - u8 kv_val[16]; /* TK */ - u8 kv_mic[8]; /* Michael MIC key */ - u8 kv_txmic[8]; /* Michael MIC TX key (used only if the hardware - * supports both MIC keys in the same key cache entry; - * in that case, kv_mic is the RX key) */ + struct_group(kv_values, + u8 kv_val[16]; /* TK */ + u8 kv_mic[8]; /* Michael MIC key */ + u8 kv_txmic[8]; /* Michael MIC TX key (used only if the hardware + * supports both MIC keys in the same key cache entry; + * in that case, kv_mic is the RX key) */ + ); }; enum ath_cipher { diff --git a/drivers/net/wireless/ath/key.c b/drivers/net/wireless/ath/key.c index 61b59a804e30..b7b61d4f02ba 100644 --- a/drivers/net/wireless/ath/key.c +++ b/drivers/net/wireless/ath/key.c @@ -503,7 +503,7 @@ int ath_key_config(struct ath_common *common, hk.kv_len = key->keylen; if (key->keylen) - memcpy(hk.kv_val, key->key, key->keylen); + memcpy(&hk.kv_values, key->key, key->keylen); if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) { switch (vif->type) {