linux-kernel - Re: [PATCH net-next] fix unsafe set_memory

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Message-ID: <1380774230.19002.135.camel@edumazet-glaptop.roam.corp.google.com>
Date:	Wed, 02 Oct 2013 21:23:50 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Xi Wang <xi.wang@...il.com>, x86@...nel.org,
	Eric Dumazet <edumazet@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] fix unsafe set_memory_rw from softirq

On Wed, 2013-10-02 at 20:50 -0700, Alexei Starovoitov wrote:
> on x86 system with net.core.bpf_jit_enable = 1

> diff --git a/include/linux/filter.h b/include/linux/filter.h
> index a6ac848..378fa03 100644
> --- a/include/linux/filter.h
> +++ b/include/linux/filter.h
> @@ -27,6 +27,7 @@ struct sk_filter
>  	unsigned int         	len;	/* Number of filter blocks */
>  	unsigned int		(*bpf_func)(const struct sk_buff *skb,
>  					    const struct sock_filter *filter);
> +	struct work_struct	work;
>  	struct rcu_head		rcu;
>  	struct sock_filter     	insns[0];
>  };

Nice catch !

It seems only x86 and s390 needs this work_struct.

(and you might CC Heiko Carstens <heiko.carstens@...ibm.com> to ask him
to make the s390 part, of Ack it if you plan to do it)

Thanks


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