Re: [PATCH nf] netfilter: nf_tables: validate hooks in NAT expressions

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On Wed, Jan 14, 2015 at 05:17:31PM +0000, Patrick McHardy wrote:
> On 14.01, Pablo Neira Ayuso wrote:
> > The user can crash the kernel if it configures the NAT chain in the
> > wrong hook, so validate that the expression is used from the right
> > hook when loading the rule.
> > 
> > This patch introduces nft_chain_validate_hooks() which is based on
> > existing code in the bridge version of the reject expression.
> 
> But this will still allow use in non base chains that are called
> from incorrect chains, right?

The expression .validate callback should make sure that doesn't happen
once you attach the non-base chain is "attached" to some base chain
via jump/goto.
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