netdev - [PATCH net-next 3/4] net: add data-race annotations in softnet_seq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250407163602.170356-4-edumazet@google.com>
Date: Mon,  7 Apr 2025 16:36:01 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Willem de Bruijn <willemb@...gle.com>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 3/4] net: add data-race annotations in softnet_seq_show()

softnet_seq_show() reads several fields that might be updated
concurrently. Add READ_ONCE() and WRITE_ONCE() annotations.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/core/dev.c        | 6 ++++--
 net/core/net-procfs.c | 6 +++---
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 969883173182..4ccc6dc5303e 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4953,7 +4953,8 @@ static void rps_trigger_softirq(void *data)
 	struct softnet_data *sd = data;
 
 	____napi_schedule(sd, &sd->backlog);
-	sd->received_rps++;
+	/* Pairs with READ_ONCE() in softnet_seq_show() */
+	WRITE_ONCE(sd->received_rps, sd->received_rps + 1);
 }
 
 #endif /* CONFIG_RPS */
@@ -7523,7 +7524,8 @@ static __latent_entropy void net_rx_action(void)
 		 */
 		if (unlikely(budget <= 0 ||
 			     time_after_eq(jiffies, time_limit))) {
-			sd->time_squeeze++;
+			/* Pairs with READ_ONCE() in softnet_seq_show() */
+			WRITE_ONCE(sd->time_squeeze, sd->time_squeeze + 1);
 			break;
 		}
 	}
diff --git a/net/core/net-procfs.c b/net/core/net-procfs.c
index 69782d62fbe1..4f0f0709a1cb 100644
--- a/net/core/net-procfs.c
+++ b/net/core/net-procfs.c
@@ -145,11 +145,11 @@ static int softnet_seq_show(struct seq_file *seq, void *v)
 	seq_printf(seq,
 		   "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x "
 		   "%08x %08x\n",
-		   sd->processed, atomic_read(&sd->dropped),
-		   sd->time_squeeze, 0,
+		   READ_ONCE(sd->processed), atomic_read(&sd->dropped),
+		   READ_ONCE(sd->time_squeeze), 0,
 		   0, 0, 0, 0, /* was fastroute */
 		   0,	/* was cpu_collision */
-		   sd->received_rps, flow_limit_count,
+		   READ_ONCE(sd->received_rps), flow_limit_count,
 		   input_qlen + process_qlen, (int)seq->index,
 		   input_qlen, process_qlen);
 	return 0;
-- 
2.49.0.504.g3bcea36a83-goog