linux-kernel - Re: [PATCH] net/xfrm: Fix lookups for states with spi == 0

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Date:   Thu, 3 May 2018 13:40:29 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     linux-kernel@...r.kernel.org, 0x7f454c46@...il.com,
        Steffen Klassert <steffen.klassert@...unet.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Masahide NAKAMURA <nakam@...ux-ipv6.org>,
        YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH] net/xfrm: Fix lookups for states with spi == 0

On Wed, May 02, 2018 at 01:41:36PM +0100, Dmitry Safonov wrote:
>
> But still it's possible to create ipsec with zero SPI.
> And it seems not making sense to search for a state with SPI hash if
> request has zero SPI.

Fair enough.  In fact a zero SPI is legal and defined for IPcomp.

The bug arose from this patch:

commit 7b4dc3600e4877178ba94c7fbf7e520421378aa6
Author: Masahide NAKAMURA <nakam@...ux-ipv6.org>
Date:   Wed Sep 27 22:21:52 2006 -0700

    [XFRM]: Do not add a state whose SPI is zero to the SPI hash.
    
    SPI=0 is used for acquired IPsec SA and MIPv6 RO state.
    Such state should not be added to the SPI hash
    because we do not care about it on deleting path.
    
    Signed-off-by: Masahide NAKAMURA <nakam@...ux-ipv6.org>
    Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>

I think it would be better to revert this.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt