netdev - Re: [PATCH] filter: add SKF_AD_NLATTR_NEST to look for nested attributes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <49229DAE.6060105@trash.net>
Date:	Tue, 18 Nov 2008 11:49:18 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Pablo Neira Ayuso <pablo@...filter.org>
CC:	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [PATCH] filter: add SKF_AD_NLATTR_NEST to look for nested attributes

Pablo Neira Ayuso wrote:
> SKF_AD_NLATTR allows us to find the first matching attribute in a
> stream of netlink attributes from one offset to the end of the
> netlink message. This is not suitable to look for a specific
> matching inside a set of nested attributes.
> 
> For example, in ctnetlink messages, if we look for the CTA_V6_SRC
> attribute in a message that talks about an IPv4 connection,
> SKF_AD_NLATTR returns the offset of CTA_STATUS which has the same
> value of CTA_V6_SRC but outside the nest. To differenciate
> CTA_STATUS and CTA_V6_SRC, we would have to make assumptions on the
> size of the attribute and the usual offset, resulting in horrible
> BSF code.
> 
> This patch adds SKF_AD_NLATTR_NEST, which is a variant of
> SKF_AD_NLATTR, that looks for an attribute inside the limits of
> a nested attributes, but not further.
> 
> This patch validates that we have enough room to look for the
> nested attributes - based on a suggestion from Patrick McHardy.

Looks good, thanks Pablo.

Acked-by: Patrick McHardy <kaber@...sh.net>
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html