netdev - Re: [PATCH bpf] bpf: sockmap, fix skb refcnt race after locking changes

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: Windows password security audit tool. GUI, reports in PDF.

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

Date: Sat, 2 Sep 2023 19:28:28 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: Eduard Zingerman <eddyz87@...il.com>
Cc: Jiri Olsa <olsajiri@...il.com>,
	John Fastabend <john.fastabend@...il.com>, xukuohai@...wei.com,
	edumazet@...gle.com, cong.wang@...edance.com, bpf@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH bpf] bpf: sockmap, fix skb refcnt race after locking
 changes

On Sat, Sep 02, 2023 at 12:24:01AM +0300, Eduard Zingerman wrote:

SNIP

> > >  static void sk_psock_skb_state(struct sk_psock *psock,
> > > @@ -685,9 +691,7 @@ static void sk_psock_backlog(struct work_struct *work)
> > >  		} while (len);
> > >  
> > >  		skb = skb_dequeue(&psock->ingress_skb);
> > > -		if (!ingress) {
> > > -			kfree_skb(skb);
> > > -		}
> > > +		kfree_skb(skb);
> > >  	}
> > >  end:
> > >  	mutex_unlock(&psock->work_mutex);
> > > -- 
> > > 2.33.0
> > > 
> > 
> > there's no crash wit with fix, but I noticed I occasionally get FAIL
> > 
> 
> Please note this patch:
> https://lore.kernel.org/bpf/20230901031037.3314007-1-xukuohai@huaweicloud.com/
> Which should fix the test in question.

ah right it does, thanks

Tested-by: Jiri Olsa <jolsa@...nel.org>

jirka

> 
> > #212/78  sockmap_listen/sockmap Unix test_unix_redir:OK
> > ./test_progs:vsock_unix_redir_connectible:1501: ingress: write: Transport endpoint is not connected
> > vsock_unix_redir_connectible:FAIL:1501
> > ./test_progs:vsock_unix_redir_connectible:1501: egress: write: Transport endpoint is not connected
> > vsock_unix_redir_connectible:FAIL:1501
> > #212/79  sockmap_listen/sockmap VSOCK test_vsock_redir:FAIL
> > #212/80  sockmap_listen/sockhash IPv4 TCP test_insert_invalid:OK
> > 
> > no idea if it's related
> > 
> > jirka
>