netdev - Re: [NET]: Fix fib_rules compatibility breakage

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Message-ID: <46003CFF.8050109@trash.net>
Date:	Tue, 20 Mar 2007 20:58:55 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Thomas Graf <tgraf@...g.ch>
CC:	Linux Netdev List <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, lartc@...lman.ds9a.nl
Subject: Re: [NET]: Fix fib_rules compatibility breakage

Thomas Graf wrote:
> * Patrick McHardy <kaber@...sh.net> 2007-03-20 17:59
> 
>>The presence of the attributes when src_len/dst_len is non-zero
>>is only verified in fib_newrule, so this looks like it might crash
>>when something broken sets src_len/dst_len to a non-zero value
>>without actually adding the attributes.
> 
> 
> You're right, we need to validate in fib_nl_delrule() as well.
> 
> Based on Patrick's patch:
> The fib_rules netlink attribute policy introduced in 2.6.19 broke
> userspace compatibilty. When specifying a rule with "from all"
> or "to all", iproute adds a zero byte long netlink attribute,
> but the policy requires all addresses to have a size equal to
> sizeof(struct in_addr)/sizeof(struct in6_addr), resulting in a
> validation error.
> 
> Check attribute length of FRA_SRC/FRA_DST in the generic framework
> by letting the family specific rules implementation provide the
> length of an address. Report an error if address length is non
> zero but no address attribute is provided. Fix actual bug by
> checking address length for non-zero instead of relying on
> availability of attribute.
> 
> Signed-off-by: Thomas Graf <tgraf@...g.ch>

This looks good, thanks.

Signed-off-by: Patrick McHardy <kaber@...sh.net>


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