netdev - Re: [PATCH iproute2] ip xfrm: support 64bit kernel and 32bit userspace

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Date:	Fri, 28 Nov 2014 15:35:28 +0800
From:	Li RongQing <roy.qing.li@...il.com>
To:	FengYu LeiDian <fengyuleidian0615@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2] ip xfrm: support 64bit kernel and 32bit userspace

On Fri, Nov 28, 2014 at 3:08 PM, FengYu LeiDian
<fengyuleidian0615@...il.com> wrote:
> 于 2014年11月28日 14:58, roy.qing.li@...il.com 写道:
>> From: Li RongQing<roy.qing.li@...il.com>
>>
>> The size of struct xfrm_userpolicy_info is 168 bytes for 64bit kernel, and
>> 164 bytes for 32bit userspace because of the different alignment. and lead
>> to "ip xfrm" be unable to work.
>>
>> add a pad in struct xfrm_userpolicy_info, and enable it by set
>> KERNEL_64_USERSPACE_32 to y
>
>
> It's not easy to fix it like this.
>
> Refer:
> http://marc.info/?l=linux-netdev&m=139280143513650&w=2
> http://thread.gmane.org/gmane.linux.network/157118/focus=157122
>

is it be practical to find all structures which has the issue for
64bit kernel and 32 bit
userspace, and conditionally add a pad for them

-Roy
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