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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id m2sm4664262pfo.45.2021.08.17.23.14.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:14:21 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Johannes Berg , "David S. Miller" , Jakub Kicinski , 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 44/63] mac80211: Use memset_after() to clear tx status Date: Tue, 17 Aug 2021 23:05:14 -0700 Message-Id: <20210818060533.3569517-45-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=3555; h=from:subject; bh=jIEORg6wH0RDOzc/SbRhmDjozuh0HKi5XMaIwXi52DY=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMn1+XywUWgPufzSUanBKkFtpljUhjVl6XdrCJz 43V0wceJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjJwAKCRCJcvTf3G3AJh5OD/ 9VdGJw1yYkd3gefk4A5UR8RKWnRGhCsbm09zznQ7YsRWg1t+N+YFLA4AFq3FqxFeqDG3jzMNoOsdTO L6w9PUmC/a9IT1z+It5L++wcgxo3uVfAxiDShSCXzCwqbKDVcSrgSTJgJPulz8y1znwvAOPKF64eH0 pSX5zFI6NJwx/mf9nIe+nz9g6VrdmWmHR7mcVM4AIklt7/5RSv325yrDnFLwAyB9rv4exDMh6Egpxj 8sF1D3Pa6Be8GmmXNM7DKo1oqmwnfhplZxkHPfRIFSXVTYwQNGJUx7dCkZsOWVIcy3w6u50Y0mU9DG A+XMuV8TDHlOIEIwtbJKGnvgGkIhTldX5Wd95E/0PKvT9wVgxcTgJUCXhO6V/PfeIWGU6PnZ849Td8 U6ZP5aiyGS6/WCMJuj0tczg2lozZzkge3SUEkNnYtQCKUr1vHrynm7rYVjMrIIvJG275gaGz60NbGE 67lI4Kcj/LGkuEZPVVCVwWeIwkVBaqWNe+W2D/Gs/U7WC+8+e2X7y7YmCXoJhak0Jjoz1KHL2NKG3c 7CTZmKih3SVwYKmzxvKgHmp8I/RljMKmk4PyeSMncOwCjk5UYHvkRAslkthRz0xs54C82JmN6NSLCC Y8i9yUKlOEZkCSxm3fC3nvo3ctL36pHA5wrQEu1m/IneouARaiIxI65dilNg== 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 memset(), avoid intentionally writing across neighboring fields. Use memset_after() so memset() doesn't get confused about writing beyond the destination member that is intended to be the starting point of zeroing through the end of the struct. Additionally fix the common helper, ieee80211_tx_info_clear_status(), which was not clearing ack_signal, but the open-coded versions did. Johannes Berg points out this bug was introduced by commit e3e1a0bcb3f1 ("mac80211: reduce IEEE80211_TX_MAX_RATES") but was harmless. Also drops the associated unneeded BUILD_BUG_ON()s, and adds a note to carl9170 about usage. Cc: Johannes Berg Cc: "David S. Miller" Cc: Jakub Kicinski Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- drivers/net/wireless/ath/carl9170/tx.c | 11 +++++------ drivers/net/wireless/intersil/p54/txrx.c | 6 +----- include/net/mac80211.h | 7 +------ 3 files changed, 7 insertions(+), 17 deletions(-) diff --git a/drivers/net/wireless/ath/carl9170/tx.c b/drivers/net/wireless/ath/carl9170/tx.c index 88444fe6d1c6..aa95d1a65882 100644 --- a/drivers/net/wireless/ath/carl9170/tx.c +++ b/drivers/net/wireless/ath/carl9170/tx.c @@ -275,12 +275,11 @@ static void carl9170_tx_release(struct kref *ref) if (WARN_ON_ONCE(!ar)) return; - BUILD_BUG_ON( - offsetof(struct ieee80211_tx_info, status.ack_signal) != 20); - - memset(&txinfo->status.ack_signal, 0, - sizeof(struct ieee80211_tx_info) - - offsetof(struct ieee80211_tx_info, status.ack_signal)); + /* + * Should this call ieee80211_tx_info_clear_status() instead of clearing + * manually? txinfo->status.rates do not seem to be used here. + */ + memset_after(&txinfo->status, 0, rates); if (atomic_read(&ar->tx_total_queued)) ar->tx_schedule = true; diff --git a/drivers/net/wireless/intersil/p54/txrx.c b/drivers/net/wireless/intersil/p54/txrx.c index 873fea59894f..8414aa208655 100644 --- a/drivers/net/wireless/intersil/p54/txrx.c +++ b/drivers/net/wireless/intersil/p54/txrx.c @@ -431,11 +431,7 @@ static void p54_rx_frame_sent(struct p54_common *priv, struct sk_buff *skb) * Clear manually, ieee80211_tx_info_clear_status would * clear the counts too and we need them. */ - memset(&info->status.ack_signal, 0, - sizeof(struct ieee80211_tx_info) - - offsetof(struct ieee80211_tx_info, status.ack_signal)); - BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, - status.ack_signal) != 20); + memset_after(&info->status, 0, rates); if (entry_hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN)) pad = entry_data->align[0]; diff --git a/include/net/mac80211.h b/include/net/mac80211.h index d8a1d09a2141..4c469b04de37 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -1197,12 +1197,7 @@ ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info) /* clear the rate counts */ for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) info->status.rates[i].count = 0; - - BUILD_BUG_ON( - offsetof(struct ieee80211_tx_info, status.ack_signal) != 20); - memset(&info->status.ampdu_ack_len, 0, - sizeof(struct ieee80211_tx_info) - - offsetof(struct ieee80211_tx_info, status.ampdu_ack_len)); + memset_after(&info->status, 0, rates); }