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net_sched: cls_route: disallow handle of 0

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Follows up on:
https://lore.kernel.org/all/20220809170518.164662-1-cascardo@canonical.com/

handle of 0 implies from/to of universe realm which is not very
sensible.

Lets see what this patch will do:
$sudo tc qdisc add dev $DEV root handle 1:0 prio

//lets manufacture a way to insert handle of 0
$sudo tc filter add dev $DEV parent 1:0 protocol ip prio 100 \
route to 0 from 0 classid 1:10 action ok

//gets rejected...
Error: handle of 0 is not valid.
We have an error talking to the kernel, -1

//lets create a legit entry..
sudo tc filter add dev $DEV parent 1:0 protocol ip prio 100 route from 10 \
classid 1:10 action ok

//what did the kernel insert?
$sudo tc filter ls dev $DEV parent 1:0
filter protocol ip pref 100 route chain 0
filter protocol ip pref 100 route chain 0 fh 0x000a8000 flowid 1:10 from 10
	action order 1: gact action pass
	 random type none pass val 0
	 index 1 ref 1 bind 1

//Lets try to replace that legit entry with a handle of 0
$ sudo tc filter replace dev $DEV parent 1:0 protocol ip prio 100 \
handle 0x000a8000 route to 0 from 0 classid 1:10 action drop

Error: Replacing with handle of 0 is invalid.
We have an error talking to the kernel, -1

And last, lets run Cascardo's POC:
$ ./poc
0
0
-22
-22
-22

Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jamal Hadi Salim 2022-08-14 11:27:58 +00:00 committed by David S. Miller
parent 7396ba87f1
commit 0279957171
1 changed files with 10 additions and 0 deletions
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10
net/sched/cls_route.c
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@ -424,6 +424,11 @@ static int route4_set_parms(struct net *net, struct tcf_proto *tp,
return -EINVAL;
}
if (!nhandle) {
NL_SET_ERR_MSG(extack, "Replacing with handle of 0 is invalid");
return -EINVAL;
}
h1 = to_hash(nhandle);
b = rtnl_dereference(head->table[h1]);
if (!b) {
@ -477,6 +482,11 @@ static int route4_change(struct net *net, struct sk_buff *in_skb,
int err;
bool new = true;
if (!handle) {
NL_SET_ERR_MSG(extack, "Creating with handle of 0 is invalid");
return -EINVAL;
}
if (opt == NULL)
return handle ? -EINVAL : 0;