netdev - Re: [PATCH v14 01/13] sk_run_filter: add BPF_S_ANC_SECCOMP_LD

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Date:	Tue, 13 Mar 2012 04:40:50 +0100
From:	"Indan Zupancic" <indan@....nu>
To:	"Will Drewry" <wad@...omium.org>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.com,
	netdev@...r.kernel.org, x86@...nel.org, arnd@...db.de,
	davem@...emloft.net, hpa@...or.com, mingo@...hat.com,
	oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
	mcgrathr@...omium.org, tglx@...utronix.de, luto@....edu,
	eparis@...hat.com, serge.hallyn@...onical.com, djm@...drot.org,
	scarybeasts@...il.com, pmoore@...hat.com,
	akpm@...ux-foundation.org, corbet@....net, eric.dumazet@...il.com,
	markus@...omium.org, coreyb@...ux.vnet.ibm.com,
	keescook@...omium.org, "Will Drewry" <wad@...omium.org>
Subject: Re: [PATCH v14 01/13] sk_run_filter: add BPF_S_ANC_SECCOMP_LD_W

Hello,

On Mon, March 12, 2012 22:28, Will Drewry wrote:
> Introduces a new BPF ancillary instruction that all LD calls will be
> mapped through when skb_run_filter() is being used for seccomp BPF.  The
> rewriting will be done using a secondary chk_filter function that is run
> after skb_chk_filter.
>
> The code change is guarded by CONFIG_SECCOMP_FILTER which is added,
> along with the seccomp_bpf_load() function later in this series.
>
> This is based on http://lkml.org/lkml/2012/3/2/141
>
> v14: First cut using a single additional instruction
> ... v13: made bpf functions generic.
>
>
> Suggested-by: Indan Zupancic <indan@....nu>
> Signed-off-by: Will Drewry <wad@...omium.org>
> ---
>  include/linux/filter.h |    1 +
>  net/core/filter.c      |    5 +++++
>  2 files changed, 6 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/filter.h b/include/linux/filter.h
> index 8eeb205..aaa2e80 100644
> --- a/include/linux/filter.h
> +++ b/include/linux/filter.h
> @@ -228,6 +228,7 @@ enum {
>  	BPF_S_ANC_HATYPE,
>  	BPF_S_ANC_RXHASH,
>  	BPF_S_ANC_CPU,
> +	BPF_S_ANC_SECCOMP_LD_W,
>  };
>
>  #endif /* __KERNEL__ */
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 5dea452..3000931 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -350,6 +350,11 @@ load_b:
>  				A = 0;
>  			continue;
>  		}
> +#ifdef CONFIG_SECCOMP_FILTER
> +		case BPF_S_ANC_SECCOMP_LD_W:
> +			A = seccomp_bpf_load(fentry->k);

I think you forgot to declare seccomp_bpf_load() anywhere filter.c can find.
That is, filter.c probably needs to include seccomp.h, or maybe better, add
"extern u32 seccomp_bpf_load(int off);" to filter.h instead.

> +			continue;
> +#endif
>  		default:
>  			WARN_RATELIMIT(1, "Unknown code:%u jt:%u tf:%u k:%u\n",
>  				       fentry->code, fentry->jt,

Reviewed-by: Indan Zupancic <indan@....nu>

Greetings,

Indan


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