netfilter: x_tables: validate all offsets and sizes in a rule

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commit 13631bfc60 upstream.

Validate that all matches (if any) add up to the beginning of
the target and that each match covers at least the base structure size.

The compat path should be able to safely re-use the function
as the structures only differ in alignment; added a
BUILD_BUG_ON just in case we have an arch that adds padding as well.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Florian Westphal 2016-04-01 14:17:29 +02:00 • committed by Greg Kroah-Hartman

parent 8a86562154

commit caa39a1e70

1 changed files with 76 additions and 5 deletions

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net/netfilter/x_tables.c

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