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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id m8-20020a1709026bc800b001897e2fd65dsm1965267plt.9.2022.11.30.13.26.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Nov 2022 13:26:48 -0800 (PST) From: Kees Cook To: Johannes Berg Cc: Kees Cook , Kalle Valo , Gregory Greenman , "Gustavo A. R. Silva" , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] wifi: ieee80211: Do not open-code qos address offsets Date: Wed, 30 Nov 2022 13:26:45 -0800 Message-Id: <20221130212641.never.627-kees@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3438; h=from:subject:message-id; bh=qZxXxI21JC4mN+ljaOuKqxqbLwAquUPCxUGbmUAdtlE=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBjh8qVfqRVaiLZwrWKZBsTnGkWYgjdX4AEocT03P5E +egjltSJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCY4fKlQAKCRCJcvTf3G3AJnGbD/ 9eLN44SC31Sfm16KmOEF+mtK8blu718iQGEZTvgbxx0w2aSj4UFjBWqJ1BEKMex8I87jo5WHNo922P ESqDuHRWT/xFXiHBP86/C93S5/ko/+1stUjOkZBJq0+/qR/eN78gpLx6Eo7xMzFB8DYT1EnSHDNwo/ ifPp2uYIaiAICdjVry3ZXELwzqZ70+xmsJuTzLxh+0V/d0ADGwSabRzjm34oD9QB+yxrLZeJrUCFS9 CtKMwLXVXBfQc7SBR47izPMtJlTr5TO1vqNXNjBl4DWDAjwLXUH1H5gyj5Lb0+icPqES1oYhtSo1kK kZzF5vEAMTwBVJx3dzDEmbxecHx8eJhgqHy22hsbHy1OfYr1GhINi5ItTltq0NjKCTotCyWhQATIB4 esln3aWsvU4q3zbvA6f22XnTtMUb1mAAJc/0fAQru5YjqI4eMc+TKIYtxx4FBpeEBBM4IPLd0d+U1y UW52ozdZHEITFf5/tVPObbZAZFTCNI3ISBYQvNXJYNoNbcVrPq2FeGLP+nN78afpxmxb9Qeat7YuRd inBgAjjtIjUE1gfsXLkoI0GT5ST2nll+8GX4DiPSkJ4G3wT/G8M0o2qpM5bfPbNi64tqYFdJA3FZT+ 4rJdCpRqYHSCOIbVvv7VqkxiV+ZVI4da0EKftcFprsutzwC5dG7Sv/CGygdA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org When building with -Wstringop-overflow, GCC's KASAN implementation does not correctly perform bounds checking within some complex structures when faced with literal offsets, and can get very confused. For example, this warning is seen due to literal offsets into sturct ieee80211_hdr that may or may not be large enough: drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c: In function 'iwl_mvm_rx_mpdu_mq': drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c:2022:29: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=] 2022 | *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; In file included from drivers/net/wireless/intel/iwlwifi/mvm/fw-api.h:32, from drivers/net/wireless/intel/iwlwifi/mvm/sta.h:15, from drivers/net/wireless/intel/iwlwifi/mvm/mvm.h:27, from drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c:10: drivers/net/wireless/intel/iwlwifi/mvm/../fw/api/rx.h:559:16: note: at offset [78, 166] into destination object 'mpdu_len' of size 2 559 | __le16 mpdu_len; | ^~~~~~~~ Refactor ieee80211_get_qos_ctl() to avoid using literal offsets, requiring the creation of the actual structure that is described in the comments. Explicitly choose the desired offset, making the code more human-readable too. This is one of the last remaining warning to fix before enabling -Wstringop-overflow globally. Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97490 Link: https://github.com/KSPP/linux/issues/181 Cc: Johannes Berg Cc: Kalle Valo Cc: Gregory Greenman Cc: "Gustavo A. R. Silva" Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- include/linux/ieee80211.h | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h index 6252f02f38b7..80d6308dea06 100644 --- a/include/linux/ieee80211.h +++ b/include/linux/ieee80211.h @@ -338,6 +338,17 @@ struct ieee80211_qos_hdr { __le16 qos_ctrl; } __packed __aligned(2); +struct ieee80211_qos_hdr_4addr { + __le16 frame_control; + __le16 duration_id; + u8 addr1[ETH_ALEN]; + u8 addr2[ETH_ALEN]; + u8 addr3[ETH_ALEN]; + __le16 seq_ctrl; + u8 addr4[ETH_ALEN]; + __le16 qos_ctrl; +} __packed __aligned(2); + struct ieee80211_trigger { __le16 frame_control; __le16 duration; @@ -4060,16 +4071,21 @@ struct ieee80211_he_6ghz_capa { * @hdr: the frame * * The qos ctrl bytes come after the frame_control, duration, seq_num - * and 3 or 4 addresses of length ETH_ALEN. - * 3 addr: 2 + 2 + 2 + 3*6 = 24 - * 4 addr: 2 + 2 + 2 + 4*6 = 30 + * and 3 or 4 addresses of length ETH_ALEN. Checks frame_control to choose + * between struct ieee80211_qos_hdr_4addr and struct ieee80211_qos_hdr. */ static inline u8 *ieee80211_get_qos_ctl(struct ieee80211_hdr *hdr) { - if (ieee80211_has_a4(hdr->frame_control)) - return (u8 *)hdr + 30; + union { + struct ieee80211_qos_hdr addr3; + struct ieee80211_qos_hdr_4addr addr4; + } *qos; + + qos = (void *)hdr; + if (ieee80211_has_a4(qos->addr3.frame_control)) + return (u8 *)&qos->addr4.qos_ctrl; else - return (u8 *)hdr + 24; + return (u8 *)&qos->addr3.qos_ctrl; } /**