netdev - Re: [PATCH ipsec-next] xfrm: Do not parse 32bits compiled xfrm netlink msg on 64bits host

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Message-Id: <20150127.001226.711259930266409202.davem@davemloft.net>
Date:	Tue, 27 Jan 2015 00:12:26 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	fengyuleidian0615@...il.com
Cc:	fan.du@...el.com, steffen.klassert@...unet.com,
	herbert@...dor.apana.org.au, netdev@...r.kernel.org
Subject: Re: [PATCH ipsec-next] xfrm: Do not parse 32bits compiled xfrm
 netlink msg on 64bits host

From: Fan Du <fengyuleidian0615@...il.com>
Date: Tue, 27 Jan 2015 15:44:36 +0800

> 于 2015年01月27日 15:39, David Miller 写道:
>> From: Fan Du <fan.du@...el.com>
>> Date: Tue, 27 Jan 2015 10:54:22 +0800
>>
>>> @@ -2419,6 +2419,11 @@ static int xfrm_user_rcv_msg(struct sk_buff
>>> *skb, struct nlmsghdr *nlh)
>>>   	const struct xfrm_link *link;
>>>   	int type, err;
>>>
>>> +#ifdef CONFIG_COMPAT
>>> +	if (is_compat_task())
>>> +		return -EPERM;
>>> +#endif
>>> +
>>
>> This seems more like an unsupported operation rather then a permission
>> problem.
>>
> how about *ENOTSUPP* ?

Unquestionably, that is an improvement over EPERM.
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