netdev - Re: [PATCH net-next] filter: do not output bpf image address for security reason

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Message-ID: <1368834171.2194.98.camel@joe-AO722>
Date:	Fri, 17 May 2013 16:42:51 -0700
From:	Joe Perches <joe@...ches.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Daniel Borkmann <dborkman@...hat.com>
Subject: Re: [PATCH net-next] filter: do not output bpf image address for
 security reason

On Fri, 2013-05-17 at 16:31 -0700, Eric Dumazet wrote:
> Do not leak starting address of BPF JIT code, as it might help
> intruders to perform an attack.
[]
> diff --git a/include/linux/filter.h b/include/linux/filter.h
[]
> @@ -58,10 +58,11 @@ extern void bpf_jit_free(struct sk_filter *fp);
>  static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
>  				u32 pass, void *image)
>  {
> -	pr_err("flen=%u proglen=%u pass=%u image=%p\n",
> -	       flen, proglen, pass, image);
> +	/* Do not output address (image) for security reason */
> +	pr_err("flen=%u proglen=%u pass=%u image=10\n",
> +	       flen, proglen, pass);

[]

Are stable equivalents for versions before commit 79617801ea0
necessary?

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