Pablo Neira Ayuso b72443ac86 netfilter: nft_compat: do not dump private area
[ Upstream commit d701d8117200399d85e63a737d2e4e897932f3b6 ]

Zero pad private area, otherwise we expose private kernel pointer to
userspace. This patch also zeroes the tail area after the ->matchsize
and ->targetsize that results from XT_ALIGN().

Fixes: 0ca743a55991 ("netfilter: nf_tables: add compatibility layer for x_tables")
Reported-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-11-24 08:23:32 +01:00
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