netdev - Re: [PATCH v2] rcu: fix a race in hlist_nulls_for_each_entry

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: <1369225727.3301.322.camel@edumazet-glaptop>
Date:	Wed, 22 May 2013 05:28:47 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Roman Gushchin <klamm@...dex-team.ru>,
	Dipankar Sarma <dipankar@...ibm.com>, zhmurov@...dex-team.ru,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH v2] rcu: fix a race in hlist_nulls_for_each_entry_rcu
 macro

On Wed, 2013-05-22 at 02:58 -0700, Paul E. McKenney wrote:

> Now that I am more awake...
> 
> The RCU list macros assume that the list header is either statically
> allocated (in which case no ACCESS_ONCE() or whatever is needed) or
> that the caller did whatever was necessary to protect the list header,
> whether that be holding the right lock, using rcu_dereference() when
> traversing the pointer to the list header, or whatever.

Not sure what you mean, we do hold rcu_read_lock() here.

But when we jump back to begin, we do not do
"rcu_read_unlock()/rcu_read_lock()" pair.



--
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