From: Florian Westphal fw@strlen.de
[ 1e9451cbda456a170518b2bfd643e2cb980880bf ]
sybot came up with following transaction: add table ip syz0 add chain ip syz0 syz2 { type nat hook prerouting priority 0; policy accept; } add table ip syz0 { flags dormant; } delete chain ip syz0 syz2 delete table ip syz0
which yields: hook not found, pf 2 num 0 WARNING: CPU: 0 PID: 6775 at net/netfilter/core.c:413 __nf_unregister_net_hook+0x3e6/0x4a0 net/netfilter/core.c:413 [..] nft_unregister_basechain_hooks net/netfilter/nf_tables_api.c:206 [inline] nft_table_disable net/netfilter/nf_tables_api.c:835 [inline] nf_tables_table_disable net/netfilter/nf_tables_api.c:868 [inline] nf_tables_commit+0x32d3/0x4d70 net/netfilter/nf_tables_api.c:7550 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:486 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:544 [inline] nfnetlink_rcv+0x14a5/0x1e50 net/netfilter/nfnetlink.c:562 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
Problem is that when I added ability to override base hook registration to make nat basechains register with the nat core instead of netfilter core, I forgot to update nft_table_disable() to use that instead of the 'raw' hook register interface.
In syzbot transaction, the basechain is of 'nat' type. Its registered with the nat core. The switch to 'dormant mode' attempts to delete from netfilter core instead.
After updating nft_table_disable/enable to use the correct helper, nft_(un)register_basechain_hooks can be folded into the only remaining caller.
Because nft_trans_table_enable() won't do anything when the DORMANT flag is set, remove the flag first, then re-add it in case re-enablement fails, else this patch breaks sequence:
add table ip x { flags dormant; } /* add base chains */ add table ip x
The last 'add' will remove the dormant flags, but won't have any other effect -- base chains are not registered. Then, next 'set dormant flag' will create another 'hook not found' splat.
Reported-by: syzbot+2570f2c036e3da5db176@syzkaller.appspotmail.com Fixes: 4e25ceb80b58 ("netfilter: nf_tables: allow chain type to override hook register") Signed-off-by: Florian Westphal fw@strlen.de Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org (cherry picked from commit 1e9451cbda456a170518b2bfd643e2cb980880bf) --- net/netfilter/nf_tables_api.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 2968f21915dd..fe9db14d01ce 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -743,7 +743,7 @@ static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt) if (cnt && i++ == cnt) break;
- nf_unregister_net_hook(net, &nft_base_chain(chain)->ops); + nf_tables_unregister_hook(net, table, chain); } }
@@ -758,7 +758,7 @@ static int nf_tables_table_enable(struct net *net, struct nft_table *table) if (!nft_is_base_chain(chain)) continue;
- err = nf_register_net_hook(net, &nft_base_chain(chain)->ops); + err = nf_tables_register_hook(net, table, chain); if (err < 0) goto err;
@@ -802,11 +802,12 @@ static int nf_tables_updtable(struct nft_ctx *ctx) nft_trans_table_enable(trans) = false; } else if (!(flags & NFT_TABLE_F_DORMANT) && ctx->table->flags & NFT_TABLE_F_DORMANT) { + ctx->table->flags &= ~NFT_TABLE_F_DORMANT; ret = nf_tables_table_enable(ctx->net, ctx->table); - if (ret >= 0) { - ctx->table->flags &= ~NFT_TABLE_F_DORMANT; + if (ret >= 0) nft_trans_table_enable(trans) = true; - } + else + ctx->table->flags |= NFT_TABLE_F_DORMANT; } if (ret < 0) goto err;