netdev - Re: [PATCH] ipv6: Prevent access to uninitialized fib_table_hash via /proc/net/ipv6

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Message-ID: <20120615105655.GA22945@hmsreliant.think-freely.org>
Date:	Fri, 15 Jun 2012 06:56:55 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: Prevent access to uninitialized fib_table_hash via
 /proc/net/ipv6_route

On Fri, Jun 15, 2012 at 11:00:17AM +0200, Thomas Graf wrote:
> /proc/net/ipv6_route reflects the contents of fib_table_hash. The proc
> handler is installed in ip6_route_net_init() whereas fib_table_hash is
> allocated in fib6_net_init() _after_ the proc handler has been installed.
> 
> This opens up a short time frame to access fib_table_hash with its pants
> down.
> 
> fib6_init() as a whole can't be moved to an earlier position as it also
> registers the rtnetlink message handlers which should be registered at
> the end. Therefore split it into fib6_init() which is run early and
> fib6_init_late() to register the rtnetlink message handlers.
> 
> Signed-off-by: Thomas Graf <tgraf@...g.ch>
Reviewed-by: Neil Horman <nhorman@...driver.com>

> 
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