netdev - Re: [PATCH 1/2] genl: Fix genl dumpit() locking.

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:	Thu, 22 Aug 2013 10:42:01 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	netdev <netdev@...r.kernel.org>, Jesse Gross <jesse@...ira.com>
Subject: Re: [PATCH 1/2] genl: Fix genl dumpit() locking.

On Thu, Aug 22, 2013 at 12:36 AM, Johannes Berg
<johannes@...solutions.net> wrote:
> On Wed, 2013-08-21 at 20:58 -0700, Pravin B Shelar wrote:
>> In case of genl-family with parallel ops off, dumpif() callback
>> is expected to run under genl_lock, But commit def3117493eafd9df
>> (genl: Allow concurrent genl callbacks.) changed this behaviour
>> where only first dumpit() op was called under genl-lock.
>> For subsequent dump, only nlk->cb_lock was taken.
>> Following patch fixes it by defining locked dumpit() and done()
>> callback which takes care of genl-locking.
>
> As I've commented over in the other thread, I really think this is the
> wrong thing to do. It was never the case that dumpit() was actually
> locked under genl_lock(), and adding it doesn't really help anyone.
>
If you look at commit def3117493eafd9df , it removes assignment of
cb_mutex to genl_mutex. Thats how genl-dump operation was called under
genl_mutex.
This patch simply restores that locking.
--
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