netdev - Re: can-bcm: fix minor heap overflow

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Message-ID: <20101112023950.GA8145@verge.net.au>
Date:	Fri, 12 Nov 2010 11:39:50 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Oliver Hartkopp <socketcan@...tkopp.net>
Cc:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Dan Rosenberg <drosenberg@...curity.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Urs Thuermann <urs@...ogud.escape.de>, security@...nel.org
Subject: Re: can-bcm: fix minor heap overflow

On Wed, Nov 10, 2010 at 11:10:30PM +0100, Oliver Hartkopp wrote:
> On 64-bit platforms the ASCII representation of a pointer may be up to 17
> bytes long. This patch increases the length of the buffer accordingly.
> 
> http://marc.info/?l=linux-netdev&m=128872251418192&w=2
> 
> Reported-by: Dan Rosenberg <drosenberg@...curity.com>
> Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>
> CC: Linus Torvalds <torvalds@...ux-foundation.org>
> 
> ---
> 
> diff --git a/net/can/bcm.c b/net/can/bcm.c
> index 08ffe9e..6faa825 100644
> --- a/net/can/bcm.c
> +++ b/net/can/bcm.c
> @@ -125,7 +125,7 @@ struct bcm_sock {
>  	struct list_head tx_ops;
>  	unsigned long dropped_usr_msgs;
>  	struct proc_dir_entry *bcm_proc_read;
> -	char procname [9]; /* pointer printed in ASCII with \0 */
> +	char procname [20]; /* pointer printed in ASCII with \0 */
>  };

If the string may be up to 17 bytes long why are you allocating 20?

>  static inline struct bcm_sock *bcm_sk(const struct sock *sk)
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