This is a note to let you know that I've just added the patch titled
netfilter: nf_tables: validate chain type update if available
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
netfilter-nf_tables-validate-chain-type-update-if-av.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bdf32faca4085f67a09a954ce6d3aa21c6643b32
Author: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Date: Thu Dec 14 22:43:22 2023 +0100
netfilter: nf_tables: validate chain type update if available
[ Upstream commit aaba7ddc8507f4ad5bbd07988573967632bc2385 ]
Parse netlink attribute containing the chain type in this update, to
bail out if this is different from the existing type.
Otherwise, it is possible to define a chain with the same name, hook and
priority but different type, which is silently ignored.
Fixes: 96518518cc41 ("netfilter: add nftables")
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 24cad36565d7..5822912045ef 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2263,7 +2263,16 @@ static int nft_chain_parse_hook(struct net *net,
return -EOPNOTSUPP;
}
- type = basechain->type;
+ if (nla[NFTA_CHAIN_TYPE]) {
+ type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
+ family);
+ if (!type) {
+ NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
+ return -ENOENT;
+ }
+ } else {
+ type = basechain->type;
+ }
}
if (!try_module_get(type->owner)) {
