netdev - Re: [Patch] net: kill an RCU warning in inet_fill_link

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 for Android: free password hash cracker in your pocket

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

Date:	Wed, 1 Dec 2010 17:22:33 -0500
From:	Thomas Graf <tgraf@...radead.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Amerigo Wang <amwang@...hat.com>, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: Re: [Patch] net: kill an RCU warning in inet_fill_link_af()

On Wed, Dec 01, 2010 at 06:31:57PM +0100, Eric Dumazet wrote:
> Are you sure RTNL is not held while dumping ? 
> 
> Patrick did the change to hold RTNL while dumping too, 3.5 years ago.
> Check commits 6313c1e0992fea, 1c2d670f3660e9103 ([RTNETLINK]: Hold
> rtnl_mutex during netlink dump callbacks)

You are right, I only looked at netlink_dump_start() where the lock
is released after setting ->cb.  We grab RTNL again in netlink_dump()
after allocating the skb.
--
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