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authorPablo Neira Ayuso <pablo@netfilter.org>2021-06-22 12:10:49 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2021-06-22 12:15:05 +0200
commite31f072ffab0397a328b31a9589dcf9733dc9c72 (patch)
tree5fb44498a930a67fd7706357c70cf8828972b72a /net/netfilter
parent534799097a777e82910f77a4f9d289c815a9a64e (diff)
netfilter: nf_tables: do not allow to delete table with owner by handle
nft_table_lookup_byhandle() also needs to validate the netlink PortID owner when deleting a table by handle. Fixes: 6001a930ce03 ("netfilter: nftables: introduce table ownership") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nf_tables_api.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 1d62b1a83299..fcb15b8904e8 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -583,7 +583,7 @@ static struct nft_table *nft_table_lookup(const struct net *net,
static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
const struct nlattr *nla,
- u8 genmask)
+ u8 genmask, u32 nlpid)
{
struct nftables_pernet *nft_net;
struct nft_table *table;
@@ -591,8 +591,13 @@ static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
nft_net = nft_pernet(net);
list_for_each_entry(table, &nft_net->tables, list) {
if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
- nft_active_genmask(table, genmask))
+ nft_active_genmask(table, genmask)) {
+ if (nft_table_has_owner(table) &&
+ nlpid && table->nlpid != nlpid)
+ return ERR_PTR(-EPERM);
+
return table;
+ }
}
return ERR_PTR(-ENOENT);
@@ -1279,7 +1284,8 @@ static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
if (nla[NFTA_TABLE_HANDLE]) {
attr = nla[NFTA_TABLE_HANDLE];
- table = nft_table_lookup_byhandle(net, attr, genmask);
+ table = nft_table_lookup_byhandle(net, attr, genmask,
+ NETLINK_CB(skb).portid);
} else {
attr = nla[NFTA_TABLE_NAME];
table = nft_table_lookup(net, attr, family, genmask,