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net/mlx5e: Avoid duplicating rule destinations
Following scenario easily break driver logic and crash the kernel:
1. Add rule with mirred actions to same device.
2. Delete this rule.
In described scenario rule is not added to database and on deletion
driver access invalid entry.
Example:
$ tc filter add dev ens1f0_0 ingress protocol ip prio 1 \
flower skip_sw \
action mirred egress mirror dev ens1f0_1 pipe \
action mirred egress redirect dev ens1f0_1
$ tc filter del dev ens1f0_0 ingress protocol ip prio 1
Dmesg output:
[ 376.634396] mlx5_core 0000:82:00.0: mlx5_cmd_check:756:(pid 3439): DESTROY_FLOW_GROUP(0x934) op_mod(0x0) failed, status bad resource state(0x9), syndrome (0x563e2f)
[ 376.654983] mlx5_core 0000:82:00.0: del_hw_flow_group:567:(pid 3439): flow steering can't destroy fg 89 of ft 3145728
[ 376.673433] kasan: CONFIG_KASAN_INLINE enabled
[ 376.683769] kasan: GPF could be caused by NULL-ptr deref or user memory access
[ 376.695229] general protection fault: 0000 [#1] PREEMPT SMP KASAN PTI
[ 376.705069] CPU: 7 PID: 3439 Comm: tc Not tainted 5.4.0-rc5+ #76
[ 376.714959] Hardware name: Supermicro SYS-2028TP-DECTR/X10DRT-PT, BIOS 2.0a 08/12/2016
[ 376.726371] RIP: 0010:mlx5_del_flow_rules+0x105/0x960 [mlx5_core]
[ 376.735817] Code: 01 00 00 00 48 83 eb 08 e8 28 d9 ff ff 4c 39 e3 75 d8 4c 8d bd c0 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 84 04 00 00 48 8d 7d 28 8b 9 d
[ 376.761261] RSP: 0018:ffff888847c56db8 EFLAGS: 00010202
[ 376.770054] RAX: dffffc0000000000 RBX: ffff8888582a6da0 RCX: ffff888847c56d60
[ 376.780743] RDX: 0000000000000058 RSI: 0000000000000008 RDI: 0000000000000282
[ 376.791328] RBP: 0000000000000000 R08: fffffbfff0c60ea6 R09: fffffbfff0c60ea6
[ 376.802050] R10: fffffbfff0c60ea5 R11: ffffffff8630752f R12: ffff8888582a6da0
[ 376.812798] R13: dffffc0000000000 R14: ffff8888582a6da0 R15: 00000000000002c0
[ 376.823445] FS: 00007f675f9a8840(0000) GS:ffff88886d200000(0000) knlGS:0000000000000000
[ 376.834971] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 376.844179] CR2: 00000000007d9640 CR3: 00000007d3f26003 CR4: 00000000001606e0
[ 376.854843] Call Trace:
[ 376.868542] __mlx5_eswitch_del_rule+0x49/0x300 [mlx5_core]
[ 376.877735] mlx5e_tc_del_fdb_flow+0x6ec/0x9e0 [mlx5_core]
[ 376.921549] mlx5e_flow_put+0x2b/0x50 [mlx5_core]
[ 376.929813] mlx5e_delete_flower+0x5b6/0xbd0 [mlx5_core]
[ 376.973030] tc_setup_cb_reoffload+0x29/0xc0
[ 376.980619] fl_reoffload+0x50a/0x770 [cls_flower]
[ 377.015087] tcf_block_playback_offloads+0xbd/0x250
[ 377.033400] tcf_block_setup+0x1b2/0xc60
[ 377.057247] tcf_block_offload_cmd+0x195/0x240
[ 377.098826] tcf_block_offload_unbind+0xe7/0x180
[ 377.107056] __tcf_block_put+0xe5/0x400
[ 377.114528] ingress_destroy+0x3d/0x60 [sch_ingress]
[ 377.122894] qdisc_destroy+0xf1/0x5a0
[ 377.129993] qdisc_graft+0xa3d/0xe50
[ 377.151227] tc_get_qdisc+0x48e/0xa20
[ 377.165167] rtnetlink_rcv_msg+0x35d/0x8d0
[ 377.199528] netlink_rcv_skb+0x11e/0x340
[ 377.219638] netlink_unicast+0x408/0x5b0
[ 377.239913] netlink_sendmsg+0x71b/0xb30
[ 377.267505] sock_sendmsg+0xb1/0xf0
[ 377.273801] ___sys_sendmsg+0x635/0x900
[ 377.312784] __sys_sendmsg+0xd3/0x170
[ 377.338693] do_syscall_64+0x95/0x460
[ 377.344833] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 377.352321] RIP: 0033:0x7f675e58e090
To avoid this, for every mirred action check if output device was
already processed. If so - drop rule with EOPNOTSUPP error.
Signed-off-by: Dmytro Linkin <dmitrolin@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Dmytro Linkin
Saeed Mahameed
parent
d76063c506
commit
554fe75c1b
@ -2999,6 +2999,25 @@ static struct ip_tunnel_info *dup_tun_info(const struct ip_tunnel_info *tun_info
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return kmemdup(tun_info, tun_size, GFP_KERNEL);
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}
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static bool is_duplicated_encap_entry(struct mlx5e_priv *priv,
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struct mlx5e_tc_flow *flow,
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int out_index,
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struct mlx5e_encap_entry *e,
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struct netlink_ext_ack *extack)
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{
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int i;
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for (i = 0; i < out_index; i++) {
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if (flow->encaps[i].e != e)
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continue;
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NL_SET_ERR_MSG_MOD(extack, "can't duplicate encap action");
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netdev_err(priv->netdev, "can't duplicate encap action\n");
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return true;
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}
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return false;
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}
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static int mlx5e_attach_encap(struct mlx5e_priv *priv,
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struct mlx5e_tc_flow *flow,
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struct net_device *mirred_dev,
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@ -3034,6 +3053,12 @@ static int mlx5e_attach_encap(struct mlx5e_priv *priv,
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/* must verify if encap is valid or not */
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if (e) {
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/* Check that entry was not already attached to this flow */
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if (is_duplicated_encap_entry(priv, flow, out_index, e, extack)) {
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err = -EOPNOTSUPP;
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goto out_err;
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}
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mutex_unlock(&esw->offloads.encap_tbl_lock);
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wait_for_completion(&e->res_ready);
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@ -3220,6 +3245,26 @@ bool mlx5e_is_valid_eswitch_fwd_dev(struct mlx5e_priv *priv,
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same_hw_devs(priv, netdev_priv(out_dev));
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}
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static bool is_duplicated_output_device(struct net_device *dev,
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struct net_device *out_dev,
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int *ifindexes, int if_count,
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struct netlink_ext_ack *extack)
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{
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int i;
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for (i = 0; i < if_count; i++) {
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if (ifindexes[i] == out_dev->ifindex) {
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NL_SET_ERR_MSG_MOD(extack,
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"can't duplicate output to same device");
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netdev_err(dev, "can't duplicate output to same device: %s\n",
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out_dev->name);
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return true;
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}
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}
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return false;
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}
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static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
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struct flow_action *flow_action,
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struct mlx5e_tc_flow *flow,
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@ -3231,11 +3276,12 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
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struct mlx5e_tc_flow_parse_attr *parse_attr = attr->parse_attr;
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struct mlx5e_rep_priv *rpriv = priv->ppriv;
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const struct ip_tunnel_info *info = NULL;
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int ifindexes[MLX5_MAX_FLOW_FWD_VPORTS];
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bool ft_flow = mlx5e_is_ft_flow(flow);
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const struct flow_action_entry *act;
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int err, i, if_count = 0;
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bool encap = false;
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u32 action = 0;
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int err, i;
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if (!flow_action_has_entries(flow_action))
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return -EINVAL;
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@ -3312,6 +3358,16 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
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struct net_device *uplink_dev = mlx5_eswitch_uplink_get_proto_dev(esw, REP_ETH);
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struct net_device *uplink_upper;
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if (is_duplicated_output_device(priv->netdev,
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out_dev,
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ifindexes,
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if_count,
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extack))
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return -EOPNOTSUPP;
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ifindexes[if_count] = out_dev->ifindex;
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if_count++;
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rcu_read_lock();
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uplink_upper =
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netdev_master_upper_dev_get_rcu(uplink_dev);
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