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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id 19sm5431637pgg.36.2021.07.27.14.16.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:16:55 -0700 (PDT) From: Kees Cook To: linux-hardening@vger.kernel.org Cc: Kees Cook , "Gustavo A. R. Silva" , Keith Packard , Greg Kroah-Hartman , Andrew Morton , linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, 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 Subject: [PATCH 24/64] staging: wlan-ng: Use struct_group() for memcpy() region Date: Tue, 27 Jul 2021 13:58:15 -0700 Message-Id: <20210727205855.411487-25-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727205855.411487-1-keescook@chromium.org> References: <20210727205855.411487-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2375; h=from:subject; bh=c/SxbSrw72JMwWGBAhjNbuucRJa6d830VHNx2pfQMmY=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOF2QDCtL/erQWj7ox+a3ncXLGvlzCwDIvWXZkH qHjzBFyJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzhQAKCRCJcvTf3G3AJtV+D/ 0fO+YtYcaNoJFtJLfaoehtt1+wVJemFnhzXbO8zron27IVuMZAcUQZRTvfedVY+1vq9YmKpR1jLhu6 TonAYm/QSoolsRdIvr0usi+NR+eRkXR1ZnyvV5rnOc9YaBWbZRrQq3ZcX6YCjqPkK8p8WRxt9Bj0Sg q5zK3/CNl56vrOTzTCCoxMsajE9vAxySqiSXHSeiMfp2xd3+QR3kRFCFU0ZSA0xfMcnR2JvGQBggJS RkdJjwLCK+kENWJtvHtlX4elSv2P/OtT8hnnPRvud1yeMq+QpTzPeNdW7PxhWE2RwZNA2NugGVRSlX 3jR4hhDV+6JtngiZjWbObIbIUZuegWEMH0zZW7dNgjbeuJq60bTRCUm4kANVmgMnCpvv/gmJ/eOGF+ Cy3TIZB46rpL4aRD/GZgx7Z3LlwLOdMudLK7tK9BsLfb7ORVmmEeOisNmyspYO6/AqlMjaI1/ZZlV3 812R76a18N3vOrFFTOfbqpkITezkVwlqkVE+0wU0/No7R2jwKaEwkopqHCE2H8k4ufJ2CY+2fLArN9 RN/NT2xb7COyOrwRuX1S423r0L/eefO2fysMApU+RwzbiD/oDAlU7jx19jPFBWMojjzIhrQhJlkdja x1kg9JKYzfTYl3DgElyjMkkBql860vUUs21cPgyOy5TcZ8V0tBlTLOvGWnpg== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-hardening@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, address[1-4], and sequence_control, 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 meaningful object code changes (i.e. only source line number induced differences.) Signed-off-by: Kees Cook --- drivers/staging/wlan-ng/hfa384x.h | 16 +++++++++------- drivers/staging/wlan-ng/hfa384x_usb.c | 4 +++- 2 files changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/staging/wlan-ng/hfa384x.h b/drivers/staging/wlan-ng/hfa384x.h index 88e894dd3568..87eb87e3beab 100644 --- a/drivers/staging/wlan-ng/hfa384x.h +++ b/drivers/staging/wlan-ng/hfa384x.h @@ -476,13 +476,15 @@ struct hfa384x_tx_frame { /*-- 802.11 Header Information --*/ - u16 frame_control; - u16 duration_id; - u8 address1[6]; - u8 address2[6]; - u8 address3[6]; - u16 sequence_control; - u8 address4[6]; + struct_group(p80211, + u16 frame_control; + u16 duration_id; + u8 address1[6]; + u8 address2[6]; + u8 address3[6]; + u16 sequence_control; + u8 address4[6]; + ); __le16 data_len; /* little endian format */ /*-- 802.3 Header Information --*/ diff --git a/drivers/staging/wlan-ng/hfa384x_usb.c b/drivers/staging/wlan-ng/hfa384x_usb.c index f2a0e16b0318..38aaae7a2d69 100644 --- a/drivers/staging/wlan-ng/hfa384x_usb.c +++ b/drivers/staging/wlan-ng/hfa384x_usb.c @@ -2516,7 +2516,9 @@ int hfa384x_drvr_txframe(struct hfa384x *hw, struct sk_buff *skb, cpu_to_le16s(&hw->txbuff.txfrm.desc.tx_control); /* copy the header over to the txdesc */ - memcpy(&hw->txbuff.txfrm.desc.frame_control, p80211_hdr, + BUILD_BUG_ON(sizeof(hw->txbuff.txfrm.desc.p80211) != + sizeof(union p80211_hdr)); + memcpy(&hw->txbuff.txfrm.desc.p80211, p80211_hdr, sizeof(union p80211_hdr)); /* if we're using host WEP, increase size by IV+ICV */ -- 2.30.2