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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id a8sm729024pfo.79.2021.08.17.23.14.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:14:12 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Greg Kroah-Hartman , Rustam Kovhaev , syzbot+22794221ab96b0bab53a@syzkaller.appspotmail.com, Allen Pais , Romain Perier , linux-staging@lists.linux.dev, "Gustavo A. R. Silva" , Andrew Morton , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, 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 19/63] staging: wlan-ng: Use struct_group() for memcpy() region Date: Tue, 17 Aug 2021 23:04:49 -0700 Message-Id: <20210818060533.3569517-20-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=2774; h=from:subject; bh=aGp1hVfQLzgNKVTBWpK4bHAQRaqFRmqtt5a8sjY+csw=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMizR57up2j4NPi4kVovJhubhBpYTgyg8yWF9zZ icJ94SKJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjIgAKCRCJcvTf3G3AJpL6D/ 9OjwhbTRWiOOzSFBp8HIcdXHzLynmUDoremqboLQbbZFdvhzt0JN+X+5SXEKgIkDTabHGAyJJg7vbo zVrFanG+ya6KLCwo9BdiQAR/ueZXO5L+r/Giz1yPapqbt9k/nsEc5SYr5ucwOuJAxFE9KIGWEqYMrT i3E/cMd8/4hSpxFdVPIAs28n3YGzs5RdmJrvt0oE1gIolLyt89z92a2rYJdvxqr4c3EEmcmpORTtTP lkwRQ5y4dqKRSgda52wvAVbJiXwqCu+cZMKZbgEa3KUIL7s+H43Se99pCXw8Ub5zIFo+91KGljDQEx tb8lzPY0rRNNY0mbwRNYXf/W38QwRxZ3D5oUvC0N/0w4QQutHp9rU1gZioa3fOM/rHRt4HcprXi+nt 0aVMHLjt3F6niAccQBbHURhgEcp8WwIJfTi/bJ+gg4LPSpeEvVE4tQYywNI4FkILs77ejtC8wiZxw7 ocghlmQFrIyZuFFHQ08aqyrz9X6fmTVjexgK98h9oM/QBofgPJlUMtugzgwK/6v8LzRJ1jiml8GBZy OhAwKq8Jq0qW2GJdSkuk64fcF8WOlLGLlP1HErn6FXZfEY4MdumebnHUJDxpcnKVjQhgEciCCqBCSb /vsaJRVs0/wXUdwiP2kC/s1S+odfxQ0hXzojzVg0H0lmI3gP3DxmkZLDHg7Q== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: netdev@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.) Cc: Greg Kroah-Hartman Cc: Rustam Kovhaev Cc: syzbot+22794221ab96b0bab53a@syzkaller.appspotmail.com Cc: Allen Pais Cc: Romain Perier Cc: linux-staging@lists.linux.dev Signed-off-by: Kees Cook Acked-by: Greg Kroah-Hartman Link: https://lore.kernel.org/lkml/YQDvC4CghCazix4w@kroah.com --- 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 */