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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id z9sm4655621pfa.2.2021.08.17.23.14.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:14:15 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Jouni Malinen , Kalle Valo , "David S. Miller" , Jakub Kicinski , Lee Jones , Allen Pais , Romain Perier , Arnd Bergmann , Vaibhav Gupta , Cong Wang , Sebastian Andrzej Siewior , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, "Gustavo A. R. Silva" , Greg Kroah-Hartman , Andrew Morton , dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com, Rasmus Villemoes , linux-hardening@vger.kernel.org Subject: [PATCH v2 15/63] intersil: Use struct_group() for memcpy() region Date: Tue, 17 Aug 2021 23:04:45 -0700 Message-Id: <20210818060533.3569517-16-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210818060533.3569517-1-keescook@chromium.org> References: <20210818060533.3569517-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3106; h=from:subject; bh=zQZGxBfl7dAgG5tBG/ZLbaDQfVLnlG18JlpAF80qB7s=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMhrEzcBPUO2fJ4Pn+xRO14SATLeMOS42x+QUKW 6CMu31qJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjIQAKCRCJcvTf3G3AJjCpD/ 0bIdtbe2MXXc36t6JnE/BOu31oCVMunfUwVmUuWjcW5QZKCJKHCaWynEtZ43tRXaPeLyqe2eluQQLX mxQinp+l5Gk6QLjrZ/2gCmzu5dy3Ll0/1wKJHvFSLUCL4ll73Dl/CpGN9Gflki+/WsFSYz93ibz/z0 M39dEpmzX3sxWiz9mnlMByQXhV/tSjSUHsC/tgcT8GzKyWO3TMpyWD1XDQCrzLJtKSQi8YpAM59d9v mfq1ifJj8/Pr227Kk8ZL7KuWz86p/CiKS6R/QqrQ43x+fO1u8dB+xui76UQiHTj+vGBAUCqvW30Bfd g2qbVS2IkFYfjmpfNjvavGsEMxqM5stGW4RqB9jSuZ4tiEXwey6K9+85Nx5lTJyKlU4YCadcNdpEr3 4/oZM06OB8PnSr4lwMAjzFhI6R0fChF5uJxb5fb6pm5hRzt5+5hlgmAopQdTaxyhDK7JO8aZOWd6oV HIrlagRF1x3sVhMuP2UMukVaahRXE6seQlBvx68gpW8OolKr9O58KEWnVxisYzpFhd2vATCBNfT5be wFUq5DxkidJPPpbEzvf40Fgl8vb7r1fbY9+Tnjy4SrwOMGmE63TRwUAhpjgQSgYHKdQMk/8OplMa30 BXm38AUk8ZEnYTmCoH5mEsYfE0KahJm/YgOEspR8zcg/IvsloK8a6Dl/Fx5w== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memcpy(), memmove(), and memset(), avoid intentionally writing across neighboring fields. Use struct_group() in struct hfa384x_tx_frame around members frame_control, duration_id, addr1, addr2, addr3, and seq_ctrl, so they can be referenced together. This will allow memcpy() and sizeof() to more easily reason about sizes, improve readability, and avoid future warnings about writing beyond the end of frame_control. "pahole" shows no size nor member offset changes to struct hfa384x_tx_frame. "objdump -d" shows no object code changes. Cc: Jouni Malinen Cc: Kalle Valo Cc: "David S. Miller" Cc: Jakub Kicinski Cc: Lee Jones Cc: Allen Pais Cc: Romain Perier Cc: Arnd Bergmann Cc: Vaibhav Gupta Cc: Cong Wang Cc: Sebastian Andrzej Siewior Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- drivers/net/wireless/intersil/hostap/hostap_hw.c | 5 +++-- drivers/net/wireless/intersil/hostap/hostap_wlan.h | 14 ++++++++------ 2 files changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/net/wireless/intersil/hostap/hostap_hw.c b/drivers/net/wireless/intersil/hostap/hostap_hw.c index 9a19046217df..cea8a9ddc4da 100644 --- a/drivers/net/wireless/intersil/hostap/hostap_hw.c +++ b/drivers/net/wireless/intersil/hostap/hostap_hw.c @@ -1812,8 +1812,9 @@ static int prism2_tx_80211(struct sk_buff *skb, struct net_device *dev) memset(&txdesc, 0, sizeof(txdesc)); /* skb->data starts with txdesc->frame_control */ - hdr_len = 24; - skb_copy_from_linear_data(skb, &txdesc.frame_control, hdr_len); + hdr_len = sizeof(txdesc.frame); + BUILD_BUG_ON(hdr_len != 24); + skb_copy_from_linear_data(skb, &txdesc.frame, hdr_len); if (ieee80211_is_data(txdesc.frame_control) && ieee80211_has_a4(txdesc.frame_control) && skb->len >= 30) { diff --git a/drivers/net/wireless/intersil/hostap/hostap_wlan.h b/drivers/net/wireless/intersil/hostap/hostap_wlan.h index dd2603d9b5d3..174735a137c5 100644 --- a/drivers/net/wireless/intersil/hostap/hostap_wlan.h +++ b/drivers/net/wireless/intersil/hostap/hostap_wlan.h @@ -115,12 +115,14 @@ struct hfa384x_tx_frame { __le16 tx_control; /* HFA384X_TX_CTRL_ flags */ /* 802.11 */ - __le16 frame_control; /* parts not used */ - __le16 duration_id; - u8 addr1[ETH_ALEN]; - u8 addr2[ETH_ALEN]; /* filled by firmware */ - u8 addr3[ETH_ALEN]; - __le16 seq_ctrl; /* filled by firmware */ + struct_group(frame, + __le16 frame_control; /* parts not used */ + __le16 duration_id; + u8 addr1[ETH_ALEN]; + u8 addr2[ETH_ALEN]; /* filled by firmware */ + u8 addr3[ETH_ALEN]; + __le16 seq_ctrl; /* filled by firmware */ + ); u8 addr4[ETH_ALEN]; __le16 data_len;