linux-kernel - Re: [PATCH 3.14 21/29] netfilter: x_tables: validate targets of jumps

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Date:	Thu, 23 Jun 2016 10:54:50 +0200
From:	Florian Westphal <fw@...len.de>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Florian Westphal <fw@...len.de>,
	Pablo Neira Ayuso <pablo@...filter.org>
Subject: Re: [PATCH 3.14 21/29] netfilter: x_tables: validate targets of jumps

Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> 3.14-stable review patch.  If anyone has any objections, please let me know.

I have -- this doesn't work in 3.14 as t->entries (the ruleset blob)
is still kept percpu.

> +static bool find_jump_target(const struct xt_table_info *t,
> +			     const struct arpt_entry *target)
> +{
> +	struct arpt_entry *iter;
> +
> +	xt_entry_foreach(iter, t->entries, t->size) {


.. so this causes in kernel soft lockup when I try to insert a rule.

I will go over the 3.14 stable queue and see if I can amend this to work
with 3.14.