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[v2,58/63] ethtool: stats: Use struct_group() to clear all stats at once

Message ID 20210818060533.3569517-59-keescook@chromium.org (mailing list archive)
State Not Applicable
Delegated to: Johannes Berg
Headers show
Series Introduce strict memcpy() bounds checking | expand

Commit Message

Kees Cook Aug. 18, 2021, 6:05 a.m. UTC 
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" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Ido Schimmel <idosch@nvidia.com>
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 net/ethtool/stats.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)
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Patch

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)