From: Andreas Steffen <andreas.steffen@hsr.ch>
To: Simon Horman <horms@verge.net.au>
Cc: "Steffen Andreas (asteffen@hsr.ch)" <asteffen@hsr.ch>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
jamal <hadi@cyberus.ca>
Subject: Re: static inline int xfrm_mark_get() broken
Date: Wed, 30 Jun 2010 07:03:05 +0200 [thread overview]
Message-ID: <4C2AD009.40306@hsr.ch> (raw)
In-Reply-To: <20100630044637.GV2138@verge.net.au>
Hello Simon,
actually I don't care how this bug is going to be fixed, but with
sizeof(struct xfrm_mark) I'm dead certain that both the mark
value and mask are being copied. Actually in the next inline
function right below sizeof(struct xfrm_mark) is used, too:
static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m)
{
if (m->m | m->v)
NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
return 0;
Regards
Andreas
On 06/30/2010 06:46 AM, Simon Horman wrote:
> On Mon, Jun 28, 2010 at 08:46:49PM +0200, Andreas Steffen wrote:
>> Hi,
>>
>> experimenting with the new XFRM_MARK feature of the 2.6.34 kernel
>> I found out that the extraction of the mark mask might accidentally
>> work on 64 bit platforms but on 32 bit platforms the function is
>> awfully broken. The rather trivial patch attached to this mail fixes
>> the problem. Otherwise the XFRM_MARK feature seems quite promising!
>>
>> Best regards
>>
>> Andreas
>>
>> ======================================================================
>> Andreas Steffen e-mail: andreas.steffen@hsr.ch
>> Institute for Internet Technologies and Applications
>> Hochschule fuer Technik Rapperswil phone: +41 55 222 42 68
>> CH-8640 Rapperswil (Switzerland) mobile: +41 76 340 25 56
>> ===========================================================[ITA-HSR]==
>
>> --- linux/include/net/xfrm.h.ori 2010-06-28 18:53:28.229489876 +0200
>> +++ linux/include/net/xfrm.h 2010-06-28 18:53:50.745487383 +0200
>> @@ -1587,7 +1587,7 @@
>> static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
>> {
>> if (attrs[XFRMA_MARK])
>> - memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(m));
>> + memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
>
> This fix looks correct to me, but
> I believe that sizeof(*m) is the preferred style.
>
>> else
>> m->v = m->m = 0;
======================================================================
Andreas Steffen e-mail: andreas.steffen@hsr.ch
Institute for Internet Technologies and Applications
Hochschule fuer Technik Rapperswil phone: +41 55 222 42 68
CH-8640 Rapperswil (Switzerland) mobile: +41 76 340 25 56
===========================================================[ITA-HSR]==
next prev parent reply other threads:[~2010-06-30 6:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-28 18:46 static inline int xfrm_mark_get() broken Andreas Steffen
2010-06-30 4:46 ` Simon Horman
2010-06-30 5:03 ` Andreas Steffen [this message]
2010-06-30 7:01 ` Simon Horman
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