netdev - Re: [PATCH] nf_conntrack: avoid kernel pointer value leak in slab name

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Message-Id: <20160514.151655.2019278235704717198.davem@davemloft.net>
Date:	Sat, 14 May 2016 15:16:55 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	torvalds@...ux-foundation.org
Cc:	eric.dumazet@...il.com, w@....eu, netdev@...r.kernel.org
Subject: Re: [PATCH] nf_conntrack: avoid kernel pointer value leak in slab
 name

From: Linus Torvalds <torvalds@...ux-foundation.org>
Date: Sat, 14 May 2016 11:24:08 -0700 (PDT)

> 
> From: Linus Torvalds <torvalds@...ux-foundation.org>
> Date: Sat, 14 May 2016 11:11:44 -0700
> Subject: [PATCH] nf_conntrack: avoid kernel pointer value leak in slab name
> 
> The slab name ends up being visible in the directory structure under
> /sys, and even if you don't have access rights to the file you can see
> the filenames.
> 
> Just use a 64-bit counter instead of the pointer to the 'net' structure
> to generate a unique name.
> 
> This code will go away in 4.7 when the conntrack code moves to a single
> kmemcache, but this is the backportable simple solution to avoiding
> leaking kernel pointers to user space.
> 
> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Acked-by: Eric Dumazet <eric.dumazet@...il.com>
> Cc: stable@...r.kernel.org

Applied, thanks.