Eric Dumazet 0e1d6eca51 rtnl: limit IFLA_NUM_TX_QUEUES and IFLA_NUM_RX_QUEUES to 4096
We have an impressive number of syzkaller bugs that are linked
to the fact that syzbot was able to create a networking device
with millions of TX (or RX) queues.

Let's limit the number of RX/TX queues to 4096, this really should
cover all known cases.

A separate patch will add various cond_resched() in the loops
handling sysfs entries at device creation and dismantle.

Tested:

lpaa6:~# ip link add gre-4097 numtxqueues 4097 numrxqueues 4097 type ip6gretap
RTNETLINK answers: Invalid argument

lpaa6:~# time ip link add gre-4096 numtxqueues 4096 numrxqueues 4096 type ip6gretap

real	0m0.180s
user	0m0.000s
sys	0m0.107s

Fixes: 76ff5cc91935 ("rtnl: allow to specify number of rx and tx queues on device creation")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-02 16:06:13 -07:00
2018-09-23 13:32:19 +02:00
2018-08-18 15:55:59 -07:00
2018-10-02 15:55:16 -07:00
2018-08-25 13:40:38 -07:00
2018-09-17 07:24:28 +02:00
2018-09-17 18:59:21 +02:00
2018-08-25 18:13:10 -07:00
2018-09-23 19:15:18 +02:00

Linux kernel
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