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netfilter: nf_tables: do not allow to delete table with owner by handle

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nft_table_lookup_byhandle() also needs to validate the netlink PortID
owner when deleting a table by handle.

Fixes: 6001a930ce ("netfilter: nftables: introduce table ownership")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2021-06-22 12:10:49 +02:00
parent 534799097a
commit e31f072ffa
1 changed files with 9 additions and 3 deletions
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12
net/netfilter/nf_tables_api.c
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@ -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,