于 2014年11月28日 15:35, Li RongQing 写道:

On Fri, Nov 28, 2014 at 3:08 PM, FengYu LeiDian
[off-list ref]  wrote:

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于 2014年11月28日 14:58,roy.qing.li@gmail.com  写道:

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From: Li RongQing<redacted>

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

Apparently struct xfrm_userpolicy_info is not the only one,
you could try to set SA as well, it breaks also...
Fix those where it hurts, hehe :) Otherwise, the "compat layer"
fix style is good choice.