From mboxrd@z Thu Jan  1 00:00:00 1970
From: FengYu LeiDian <fengyuleidian0615@gmail.com>
Subject: Re: [PATCH iproute2] ip xfrm: support 64bit kernel and 32bit userspace
Date: Fri, 28 Nov 2014 15:08:05 +0800
Message-ID: <54781F55.5040603@gmail.com>
References: <1417157936-5522-1-git-send-email-roy.qing.li@gmail.com>
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=D3=DA 2014=C4=EA11=D4=C228=C8=D5 14:58, roy.qing.li@gmail.com =D0=B4=B5=
=C0:
> From: Li RongQing<roy.qing.li@gmail.com> =20
>=20
> 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.
>=20
> 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=3Dlinux-netdev&m=3D139280143513650&w=3D2
http://thread.gmane.org/gmane.linux.network/157118/focus=3D157122