On Wed, Feb 07, 2018 at 01:46:25PM +0100, Florian Westphal wrote:
> The rationale for removing the check is only correct for rulesets
> generated by ip(6)tables.
> In iptables, a jump can only occur to a user-defined chain, i.e.
> because we size the stack based on number of user-defined chains we
> cannot exceed stack size.
> However, the underlying binary format has no such restriction,
> and the validation step only ensures that the jump target is a
> valid rule start point.
> IOW, its possible to build a rule blob that has no user-defined
> chains but does contain a jump.
> If this happens, no jump stack gets allocated and crash occurs
> because no jumpstack was allocated.
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