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From: Marcelo Ricardo Leitner <>
To: Or Cohen <>
Subject: Re: [PATCH v2] net/sctp: fix race condition in sctp_destroy_sock
Date: Tue, 13 Apr 2021 16:08:27 -0300	[thread overview]
Message-ID: <YHXsK3DzBTsO00lb@horizon.localdomain> (raw)
In-Reply-To: <>

On Tue, Apr 13, 2021 at 09:10:31PM +0300, Or Cohen wrote:
> If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock
> held and sp->do_auto_asconf is true, then an element is removed
> from the auto_asconf_splist without any proper locking.
> This can happen in the following functions:
> 1. In sctp_accept, if sctp_sock_migrate fails.
> 2. In inet_create or inet6_create, if there is a bpf program
>    attached to BPF_CGROUP_INET_SOCK_CREATE which denies
>    creation of the sctp socket.
> The bug is fixed by acquiring addr_wq_lock in sctp_destroy_sock
> instead of sctp_close.
> This addresses CVE-2021-23133.
> Reported-by: Or Cohen <>
> Reviewed-by: Xin Long <>
> Fixes: 610236587600 ("bpf: Add new cgroup attach type to enable sock modifications")
> Signed-off-by: Or Cohen <>

Thanks folks.
Acked-by: Marcelo Ricardo Leitner <>

  reply	other threads:[~2021-04-13 19:08 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-13 18:10 [PATCH v2] net/sctp: fix race condition in sctp_destroy_sock Or Cohen
2021-04-13 19:08 ` Marcelo Ricardo Leitner [this message]
2021-04-13 22:10 ` patchwork-bot+netdevbpf

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