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cls_flower: fix use after free in flower S/W path 

If flower filter is created without the skip_sw flag, fl_mask_put()
can race with fl_classify() and we can destroy the mask rhashtable
while a lookup operation is accessing it.

 BUG: unable to handle kernel paging request at 00000000000911d1
 PGD 0 P4D 0
 SMP PTI
 CPU: 3 PID: 5582 Comm: vhost-5541 Not tainted 4.18.0-rc1.vanilla+ #1950
 Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.1.7 06/16/2016
 RIP: 0010:rht_bucket_nested+0x20/0x60
 Code: 31 c8 c1 c1 18 29 c8 c3 66 90 8b 4f 04 ba 01 00 00 00 8b 07 48 8b bf 80 00 00 0
 RSP: 0018:ffffafc5cfbb7a48 EFLAGS: 00010206
 RAX: 0000000000001978 RBX: ffff9f12dff88a00 RCX: 00000000ffff9f12
 RDX: 00000000000911d1 RSI: 0000000000000148 RDI: 0000000000000001
 RBP: ffff9f12dff88a00 R08: 000000005f1cc119 R09: 00000000a715fae2
 R10: ffffafc5cfbb7aa8 R11: ffff9f1cb4be804e R12: ffff9f1265e13000
 R13: 0000000000000000 R14: ffffafc5cfbb7b48 R15: ffff9f12dff88b68
 FS:  0000000000000000(0000) GS:ffff9f1d3f0c0000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 00000000000911d1 CR3: 0000001575a94006 CR4: 00000000001626e0
 Call Trace:
  fl_lookup+0x134/0x140 [cls_flower]
  fl_classify+0xf3/0x180 [cls_flower]
  tcf_classify+0x78/0x150
  __netif_receive_skb_core+0x69e/0xa50
  netif_receive_skb_internal+0x42/0xf0
  tun_get_user+0xdd5/0xfd0 [tun]
  tun_sendmsg+0x52/0x70 [tun]
  handle_tx+0x2b3/0x5f0 [vhost_net]
  vhost_worker+0xab/0x100 [vhost]
  kthread+0xf8/0x130
  ret_from_fork+0x35/0x40
 Modules linked in: act_mirred act_gact cls_flower vhost_net vhost tap sch_ingress
 CR2: 00000000000911d1

Fix the above waiting for a RCU grace period before destroying the
rhashtable: we need to use tcf_queue_work(), as rhashtable_destroy()
must run in process context, as pointed out by Cong Wang.

v1 -> v2: use tcf_queue_work to run rhashtable_destroy().

Fixes: 05cd271fd6 ("cls_flower: Support multiple masks per priority")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2018-06-21 20:02:16 +02:00 committed by David S. Miller
parent 945d015ee0
commit 44a5cd436e
1 changed files with 17 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
net/sched/cls_flower.c
View File

@ -66,7 +66,7 @@ struct fl_flow_mask {
struct rhashtable_params filter_ht_params;
struct flow_dissector dissector;
struct list_head filters;
struct rcu_head rcu;
struct rcu_work rwork;
struct list_head list;
};
@ -203,6 +203,20 @@ static int fl_init(struct tcf_proto *tp)
return rhashtable_init(&head->ht, &mask_ht_params);
}
static void fl_mask_free(struct fl_flow_mask *mask)
{
rhashtable_destroy(&mask->ht);
kfree(mask);
}
static void fl_mask_free_work(struct work_struct *work)
{
struct fl_flow_mask *mask = container_of(to_rcu_work(work),
struct fl_flow_mask, rwork);
fl_mask_free(mask);
}
static bool fl_mask_put(struct cls_fl_head *head, struct fl_flow_mask *mask,
bool async)
{
@ -210,12 +224,11 @@ static bool fl_mask_put(struct cls_fl_head *head, struct fl_flow_mask *mask,
return false;
rhashtable_remove_fast(&head->ht, &mask->ht_node, mask_ht_params);
rhashtable_destroy(&mask->ht);
list_del_rcu(&mask->list);
if (async)
kfree_rcu(mask, rcu);
tcf_queue_work(&mask->rwork, fl_mask_free_work);
else
kfree(mask);
fl_mask_free(mask);
return true;
}