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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id s16sm1923432pfd.95.2021.08.17.23.24.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:24:15 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , "David S. Miller" , Jakub Kicinski , Ido Schimmel , netdev@vger.kernel.org, "Gustavo A. R. Silva" , Greg Kroah-Hartman , Andrew Morton , linux-wireless@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, Rasmus Villemoes , linux-hardening@vger.kernel.org Subject: [PATCH v2 58/63] ethtool: stats: Use struct_group() to clear all stats at once Date: Tue, 17 Aug 2021 23:05:28 -0700 Message-Id: <20210818060533.3569517-59-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=1971; h=from:subject; bh=E0TNBYZqVPbRitBJ5Zh/gLEgPeByfWBcEVfphcdRPN4=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMrF3QPyVB5GMFoBwvbiS+bGesf32/XaWgZh6rV XXUSuGeJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjKwAKCRCJcvTf3G3AJuI/EA ChJAduV9dwQnlnG3wxAW9hWJ1q1jYsNmAAW03oHPyyyn4KhoNewX3nohRktZszGSOaJbWUuapbs0QS zhzLmfVfKhD7+DDfnZKD0XnlGiqH7Qvf5Q5ntMO0/ssU3MUgRP1gtdtb5NMHkByui7zpX/5x9W/2YW raKvA1KIXU6CdJePHvujGsZ5QP8biHCDP1thhwyJfUA4XwPHO3b8i6IC1kMBzBKINuCjLSkeqN3uWD PwoL5hyTqy4UKJN0gW6vj/hdXoIY6bLL/pGtAASCMDf1ZqU/p4Jgph8esB5nghJM4B5K/afkMfJgB+ vA/vxaYQSYgK9DPmx0RcanTPpspjeL27cp7jQyYi0izLRnpEiExj2zheTEAvmAN6nqq/leBQk6MTwN uE7XQ8NliZBAE0y+b+xl4TZEDKqaf3ZQLquskbjy9INmiSPSDGgnZODLH9BjIy5eLOJ0nYrc8QLN5B D18Vfd3FY3RNXbQkdqHx6rRPcX8ywj2ipEby99d78Sf6C421sRvINJCco18C7ckUJ5KbK307TNNlzA niH2xNat1pGZwKiztnfUGK9vkqebtbw9PjWgnoloa26nxruikmIBNbDpX17yxNTtNblkMvaAIxgqlv ZbPLstx3DpgFgVYefzNXWqrNibdM/9iNuS0mCC0zQsf6ZcpjwRIHZD0WHkXA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields. Add struct_group() to mark region of struct stats_reply_data that should be initialized, which can now be done in a single memset() call. Cc: "David S. Miller" Cc: Jakub Kicinski Cc: Ido Schimmel Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- net/ethtool/stats.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/net/ethtool/stats.c b/net/ethtool/stats.c index ec07f5765e03..a20e0a24ff61 100644 --- a/net/ethtool/stats.c +++ b/net/ethtool/stats.c @@ -14,10 +14,12 @@ struct stats_req_info { struct stats_reply_data { struct ethnl_reply_data base; - struct ethtool_eth_phy_stats phy_stats; - struct ethtool_eth_mac_stats mac_stats; - struct ethtool_eth_ctrl_stats ctrl_stats; - struct ethtool_rmon_stats rmon_stats; + struct_group(stats, + struct ethtool_eth_phy_stats phy_stats; + struct ethtool_eth_mac_stats mac_stats; + struct ethtool_eth_ctrl_stats ctrl_stats; + struct ethtool_rmon_stats rmon_stats; + ); const struct ethtool_rmon_hist_range *rmon_ranges; }; @@ -117,10 +119,7 @@ static int stats_prepare_data(const struct ethnl_req_info *req_base, /* Mark all stats as unset (see ETHTOOL_STAT_NOT_SET) to prevent them * from being reported to user space in case driver did not set them. */ - memset(&data->phy_stats, 0xff, sizeof(data->phy_stats)); - memset(&data->mac_stats, 0xff, sizeof(data->mac_stats)); - memset(&data->ctrl_stats, 0xff, sizeof(data->ctrl_stats)); - memset(&data->rmon_stats, 0xff, sizeof(data->rmon_stats)); + memset(&data->stats, 0xff, sizeof(data->stats)); if (test_bit(ETHTOOL_STATS_ETH_PHY, req_info->stat_mask) && dev->ethtool_ops->get_eth_phy_stats)