netdev - RE: [PATCHv3 ipsec-next] xfrm: Do not parse 32bits compiled xfrm netlink msg on 64bits host

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Date:	Wed, 28 Jan 2015 09:53:33 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'David Miller' <davem@...emloft.net>
CC:	"fan.du@...el.com" <fan.du@...el.com>,
	"steffen.klassert@...unet.com" <steffen.klassert@...unet.com>,
	"herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"fengyuleidian0615@...il.com" <fengyuleidian0615@...il.com>
Subject: RE: [PATCHv3 ipsec-next] xfrm: Do not parse 32bits compiled xfrm
 netlink msg on 64bits host

From: David Miller
> From: David Laight <David.Laight@...LAB.COM>
> Date: Tue, 27 Jan 2015 09:46:21 +0000
> 
> > From: Fan Du
> >> structure like xfrm_usersa_info or xfrm_userpolicy_info
> >> has different sizeof when compiled as 32bits and 64bits
> >> due to not appending pack attribute in their definition.
> >
> > Don't 'pack' the structure, just ensure that all the fields
> > are fixed sized and on their natural boundary.
> 
> This horse went out of the door more than a decade ago, we can't
> change the layout of any of these structures and must at some point
> add code to translate instead.

>From the other mail it might just be tail-padding.
So any adaption code is easy.

	David

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