netdev - Re: [PATCH net] sch_netem: fix rcu splat in netem

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 for Android: free password hash cracker in your pocket

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

Message-Id: <20190927.103022.2097498898113497055.davem@davemloft.net>
Date:   Fri, 27 Sep 2019 10:30:22 +0200 (CEST)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net] sch_netem: fix rcu splat in netem_enqueue()

From: Eric Dumazet <edumazet@...gle.com>
Date: Tue, 24 Sep 2019 13:11:26 -0700

> qdisc_root() use from netem_enqueue() triggers a lockdep warning.
> 
> __dev_queue_xmit() uses rcu_read_lock_bh() which is
> not equivalent to rcu_read_lock() + local_bh_disable_bh as far
> as lockdep is concerned.
 ...
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>

Applied.