Disallow updating the ownership bit on an existing table: Do not allow
to grab ownership on an existing table. Do not allow to drop ownership
on an existing table.
Fixes: 6001a930ce03 ("netfilter: nftables: introduce table ownership")
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/netfilter/nf_tables_api.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index c1eb5cdb3033..b07703e19108 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -916,6 +916,12 @@ static int nf_tables_updtable(struct nft_ctx *ctx)
if (flags == ctx->table->flags)
return 0;
+ if ((nft_table_has_owner(ctx->table) &&
+ !(flags & NFT_TABLE_F_OWNER)) ||
+ (!nft_table_has_owner(ctx->table) &&
+ flags & NFT_TABLE_F_OWNER))
+ return -EOPNOTSUPP;
+
trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
sizeof(struct nft_trans_table));
if (trans == NULL)
--
2.20.1
