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08 September 2024, 02:26:05 UTC
Revision 3bfe049807c240344b407e3cfb74544927359817 authored by Francesco Ruggeri on 17 May 2015, 21:30:31 UTC, committed by Pablo Neira Ayuso on 20 May 2015, 11:46:48 UTC 
netfilter: nfnetlink_{log,queue}: Register pernet in first place
 
nfnetlink_{log,queue}_init() register the netlink callback nf*_rcv_nl_event
before registering the pernet_subsys, but the callback relies on data
structures allocated by pernet init functions.

When nfnetlink_{log,queue} is loaded, if a netlink message is received after
the netlink callback is registered but before the pernet_subsys is registered,
the kernel will panic in the sequence

nfulnl_rcv_nl_event
  nfnl_log_pernet
    net_generic
      BUG_ON(id == 0)  where id is nfnl_log_net_id.

The panic can be easily reproduced in 4.0.3 by:

while true ;do modprobe nfnetlink_log ; rmmod nfnetlink_log ; done &
while true ;do ip netns add dummy ; ip netns del dummy ; done &

This patch moves register_pernet_subsys to earlier in nfnetlink_log_init.

Notice that the BUG_ON hit in 4.0.3 was recently removed in 2591ffd308
["netns: remove BUG_ONs from net_generic()"].

Signed-off-by: Francesco Ruggeri <fruggeri@arista.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1 parent 13c3ed6
History
Tip revision: 3bfe049807c240344b407e3cfb74544927359817 authored by Francesco Ruggeri on 17 May 2015, 21:30:31 UTC
netfilter: nfnetlink_{log,queue}: Register pernet in first place
Tip revision: 3bfe049
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