linux-kernel - Re: [PATCH tip/core/rcu 28/48] net: Make accesses to ->br

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, 5 May 2010 15:03:55 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	dvhltc@...ibm.com, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH tip/core/rcu 28/48] net: Make accesses to ->br_port
 safe for sparse RCU

On Tue, May 04, 2010 at 11:41:49PM +0200, Arnd Bergmann wrote:
> On Tuesday 04 May 2010 23:26:31 Stephen Hemminger wrote:
> > > The new versions of the rcu_dereference() APIs requires that any pointers
> > > passed to one of these APIs be fully defined.  The ->br_port field
> > > in struct net_device points to a struct net_bridge_port, which is an
> > > incomplete type.  This commit therefore changes ->br_port to be a void*,
> > > and introduces a br_port() helper function to convert the type to struct
> > > net_bridge_port, and applies this new helper function where required.
> > 
> > I would rather make the bridge hook generic and not take a type argument.
> 
> Not sure if you were confused by the comment in the same way that I was.
> 
> The bridge hook is not impacted by this at all, since we can either pass
> a void* or a struct net_bridge_port* to it. The br_port() helper
> is used for all the places where we actually want to dereference 
> dev->br_port and access its contents.

What should I change in the commit message to clear this up?

Of course, if the code needs to change, please let me know what should
change there as well.

							Thanx, Paul
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/