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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id q9sm489033pfj.88.2021.11.18.12.34.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Nov 2021 12:34:58 -0800 (PST) From: Kees Cook To: "David S. Miller" Cc: Kees Cook , Jakub Kicinski , Ido Schimmel , YueHaibing , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] ethtool: stats: Use struct_group() to clear all stats at once Date: Thu, 18 Nov 2021 12:34:56 -0800 Message-Id: <20211118203456.1288056-1-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1822; h=from:subject; bh=nf2hDwlk0YBMeQam31KvtF6X3nn/T4T4psodjHluwA0=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhlrjv4ay2vSP0iUDUl/jIVt/Blah8KWXvHVH7Wzv7 NYIRQBeJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYZa47wAKCRCJcvTf3G3AJvBJD/ 9Na9qQTVUsisud4heS8I6/Jho/ZfNvhU2k2tn9Jv8ASHEdfY+9rKBmAX0tJUczauv+kWXiRwOxOx1j cyjX0xISkco0aZfG4vj9XQIBc9CPxkBDj0aBaz78+IHKOWr59+S2V0QmYL04Ycdak/MayJzGvfL/ms BBSYWc++4lXP0WYaJNF9zs4hYQvVxJi85u3Z241lUdvn8UPyRvjxOMzMw35oZCGza98pHctIJ+zobA 7BuEbCEL6kjwD9s4XETlcN2NoABT+e4W6HNrNBi/QuOwjP/0KNVbljl43XnBqwqfeBeItZPJOs2X3m Jidx5KHe54mlK+PcMFnJtcRBfnJu14HAX9nymfBRP2Z1vqwECWXdGkHOPfVsIhxjHonSfgVDB4RlaM 1LYUcHgCmJY+biBO46pJTSRx9vt6J5ZTCWlWhlIubJSuakDoRCEhEON+8iaFeWJybYZNJQ+I/JBsRI eVwXeWvkcvE8wFRTtugO1pST327roZ7fIGFcbk9SW2udTvFSoFQgaNnlx3OmSKeKN01a0cAPz7VF6/ h+9yaYmVn29wO+1VqwUS9QH0Km77doUOTyCQr1SRxSVhxE37TLIEdBCBVYxPKtat++V3Ea7YNVOQRf 8oTFbBdf9aBk/R4uU1KGLqFfSVHLFQbQ3CaEc9do1jYpilSFqay8yZQsLa+w== 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. 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)