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

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1CAD3B2B@AcuExch.aculab.com>
Date:	Tue, 27 Jan 2015 09:46:21 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Fan Du' <fan.du@...el.com>,
	"steffen.klassert@...unet.com" <steffen.klassert@...unet.com>
CC:	"herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"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: 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.

Possibly add a compile-time check that the structure is
of the expected size.

	David

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