linux-kernel - Commit f211ac154577ec9ccf07c15f18a6abf0d9bdb4ab breaks Smack TCP connections

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Message-ID: <3f8328fe-e648-9d0e-729d-eb6787f11bf9@schaufler-ca.com>
Date:   Tue, 30 Mar 2021 08:42:04 -0700
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     liuyacan <yacanliu@....com>,
        "David S. Miller" <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Security Module list 
        <linux-security-module@...r.kernel.org>
Cc:     Casey Schaufler <casey@...aufler-ca.com>,
        smack-announce@...ts.01.org
Subject: Commit f211ac154577ec9ccf07c15f18a6abf0d9bdb4ab breaks Smack TCP
 connections

Commit f211ac154577ec9ccf07c15f18a6abf0d9bdb4ab 'net: correct
sk_acceptq_is_full()' breaks a system with the Smack LSM.
Reverting this change results in a return to correct behavior.

The Smack testsuite can be found at:
	https://github.com/smack-team/smack-testsuite.git

The failing test is ipv4-tcp-local-peersec.sh, but it seems
that most TCP connections hang with SYN_SENT. Oddly, ssh
to 127.0.0.1 works, but other TCP connections timeout.