netdev - Re: [PATCH] net: rework recvmsg handler msg_name and msg

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Date:	Thu, 21 Nov 2013 09:52:30 -0500
From:	Vlad Yasevich <vyasevich@...il.com>
To:	netdev@...r.kernel.org, davem@...emloft.net, eric.dumazet@...il.com
Subject: Re: [PATCH] net: rework recvmsg handler msg_name and msg_namelen
 logic

On 11/20/2013 07:38 PM, Hannes Frederic Sowa wrote:
> diff --git a/include/linux/net.h b/include/linux/net.h
> index b292a04..4bcee94 100644
> --- a/include/linux/net.h
> +++ b/include/linux/net.h
> @@ -164,6 +164,14 @@ struct proto_ops {
>  #endif
>  	int		(*sendmsg)   (struct kiocb *iocb, struct socket *sock,
>  				      struct msghdr *m, size_t total_len);
> +	/* Notes for implementing recvmsg:
> +	 * ===============================
> +	 * msg->msg_namelen should get updated by the recvmsg handlers
> +	 * iff msg_name != NULL. It is by default 0 to prevent
> +	 * returning uninitialized memory to user space.  The recvfrom
> +	 * handlers can assume that msg.msg_name is either NULL or has
> +	 * a minimum size of sizeof(struct sockaddr_storage).
             ^^^^^^^

You meant "maximum", right?

-vlad
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