netdev - Re: netlink & rhashtable status

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]

Message-ID: <1431573463.27831.32.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 13 May 2015 20:17:43 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, Thomas Graf <tgraf@...g.ch>,
	netdev <netdev@...r.kernel.org>
Subject: Re: netlink & rhashtable status

On Thu, 2015-05-14 at 10:53 +0800, Herbert Xu wrote:
> On Wed, May 13, 2015 at 09:18:04AM -0700, Eric Dumazet wrote:
> >
> > For 4.0.3 I replaced the two rhashtable files by current Linus version,
> > and problem is gone, so the fix is not in net/netlink
> 
> Are you sure the same bug happens in 3.17 too? I can certainly see
> this happening after the dynamic rehashing code went in.
> 
> But in 3.17 it was doing everything under one single lock so I can't
> really see how things can go wrong.

The initial bug report was on 3.18 for sure.

(Tester had to leave the program run ~8 hours to get the problem, on a 8
vCPU VM)

I can reproduce the bug quite easily (in a few seconds) on 4.0.3, I did
not spent lot of time trying 3.18, but it seems a bit harder.



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html