netdev - [BUG] Potential net namespace information leakage in /proc/net/sockstat

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Message-ID: <MWHPR2201MB10728AE0EB8C691B5CDA6D7DD0A19@MWHPR2201MB1072.namprd22.prod.outlook.com>
Date:   Fri, 3 Jun 2022 22:53:16 +0000
From:   "Liu, Congyu" <liu3101@...due.edu>
To:     "edumazet@...gle.com" <edumazet@...gle.com>,
        "ebiederm@...ssion.com" <ebiederm@...ssion.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [BUG] Potential net namespace information leakage in
 /proc/net/sockstat

Hi, 

In our test conducted on namespace, we found net information leakage in /proc/net/sockstat. For instance, the TCP "alloc" field exposes a TCP socket related counter that is shared across all net namespaces on the same host. Is this an intentional design for specific purposes? 

Thanks,
Congyu