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Date:   Thu, 18 Jun 2020 09:44:33 +0800
From:   Zefan Li <lizefan@...wei.com>
To:     Cong Wang <xiyou.wangcong@...il.com>, <netdev@...r.kernel.org>
CC:     Cameron Berkenpas <cam@...-zeon.de>,
        Peter Geis <pgwipeout@...il.com>,
        "Lu Fengqi" <lufq.fnst@...fujitsu.com>,
        Daniël Sonck <dsonck92@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Tejun Heo <tj@...nel.org>, Roman Gushchin <guro@...com>
Subject: Re: [Patch net] cgroup: fix cgroup_sk_alloc() for sk_clone_lock()

Cc: Roman Gushchin <guro@...com>

Thanks for fixing this.

On 2020/6/17 2:03, Cong Wang wrote:
> When we clone a socket in sk_clone_lock(), its sk_cgrp_data is
> copied, so the cgroup refcnt must be taken too. And, unlike the
> sk_alloc() path, sock_update_netprioidx() is not called here.
> Therefore, it is safe and necessary to grab the cgroup refcnt
> even when cgroup_sk_alloc is disabled.
> 
> sk_clone_lock() is in BH context anyway, the in_interrupt()
> would terminate this function if called there. And for sk_alloc()
> skcd->val is always zero. So it's safe to factor out the code
> to make it more readable.
> 
> Fixes: 090e28b229af92dc5b ("netprio_cgroup: Fix unlimited memory leak of v2 cgroups")

but I don't think the bug was introduced by this commit, because there
are already calls to cgroup_sk_alloc_disable() in write_priomap() and
write_classid(), which can be triggered by writing to ifpriomap or
classid in cgroupfs. This commit just made it much easier to happen
with systemd invovled.

I think it's 4bfc0bb2c60e2f4c ("bpf: decouple the lifetime of cgroup_bpf from cgroup itself"),
which added cgroup_bpf_get() in cgroup_sk_alloc().

> Reported-by: Cameron Berkenpas <cam@...-zeon.de>
> Reported-by: Peter Geis <pgwipeout@...il.com>
> Reported-by: Lu Fengqi <lufq.fnst@...fujitsu.com>
> Reported-by: Daniël Sonck <dsonck92@...il.com>
> Tested-by: Cameron Berkenpas <cam@...-zeon.de>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Zefan Li <lizefan@...wei.com>
> Cc: Tejun Heo <tj@...nel.org>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
> ---

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