The various stable kernels suffer from one of the following
problems:
- They don't have 36472341017529e ("netfilter: x_tables: validate targets of
jumps").
In that case there is no validation which is problematic with unpriv netns
support
or when using unprivileged containers.
- They have a faulty backport of this commit and xtables is completely
broken (kernel freeze since we iterate over random memory contents).
This affects current 3.18.y and 4.1.y kernels for example.
- They have a correct backport of this commit, which causes problems
with large rulesets (depending on machine, 1k or more; but even on
fast machines rulesets with more than 10k rules cause softlockup during
iptables-restore and friends).
These patches all contain the same backport but amended so it applies
to the indicated stable branch.
For 3.12:
- adjust for extra debug printks and lack of 36472341017529e.
(The 36472341017529e commit is superseded by this).
For 3.14:
- adjust for extra debug printks and lack of kvfree.
This backport is only needed to speed up rule validation.
For 3.18:
- adjust for extra debug printks and broken 36472341017529e backport.
This backport is needed to make xtables work, we currently walk
over random memory content so any iptables -A ... command will either
fail or lock up.
For 4.1.y: same as 3.18.
For 4.4: Same as 3.14 -- backport is only needed to speed up ruleset
validtion.
The 4.4 backport will also apply to the 4.6.y tree.
I briefly tested all the kernels with these patches applied and
the large dummy ruleset from the commit message.
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