This is a note to let you know that I've just added the patch titled
netfilter: nf_tables: disallow element updates of bound anonymous sets
to the 5.4-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-disallow-element-updates-of-boun.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c8e7da32e10b8aa8b3f1c8cb84470bd05b2a72f9
Author: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Date: Fri Jun 16 15:20:16 2023 +0200
netfilter: nf_tables: disallow element updates of bound anonymous sets
[ Upstream commit c88c535b592d3baeee74009f3eceeeaf0fdd5e1b ]
Anonymous sets come with NFT_SET_CONSTANT from userspace. Although API
allows to create anonymous sets without NFT_SET_CONSTANT, it makes no
sense to allow to add and to delete elements for bound anonymous sets.
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 909076ef157e8..914fbd9ecef96 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4804,7 +4804,8 @@ static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
if (IS_ERR(set))
return PTR_ERR(set);
- if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
+ if (!list_empty(&set->bindings) &&
+ (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
return -EBUSY;
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
@@ -4987,7 +4988,9 @@ static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
if (IS_ERR(set))
return PTR_ERR(set);
- if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
+
+ if (!list_empty(&set->bindings) &&
+ (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
return -EBUSY;
if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
