netfilter: nf_tables: disallow rule removal from chain binding

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[ Upstream commit f15f29fd47 ]

Chain binding only requires the rule addition/insertion command within
the same transaction. Removal of rules from chain bindings within the
same transaction makes no sense, userspace does not utilize this
feature. Replace nft_chain_is_bound() check to nft_chain_binding() in
rule deletion commands. Replace command implies a rule deletion, reject
this command too.

Rule flush command can also safely rely on this nft_chain_binding()
check because unbound chains are not allowed since 62e1e94b24
("netfilter: nf_tables: reject unbound chain set before commit phase").

Fixes: d0e2c7de92 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Reported-by: Kevin Rich <kevinrich1337@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Pablo Neira Ayuso 2023-09-07 08:22:33 +02:00 • committed by Greg Kroah-Hartman

parent 980663f1d1

commit 9af8bb2afe

1 changed files with 13 additions and 5 deletions

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net/netfilter/nf_tables_api.c

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