On Tue, Jan 8, 2019 at 3:08 AM Piotr Sawicki <p.sawic...@partner.samsung.com> wrote:
> Yes I know. It looks like the Smack's security rule was changed during this > process. > > Firstly the packet was allowed to be received and it was put into the backlog > queue. Then, the > > rule was changed, and during the release phase LSM was called again for the > same packet. > > But this time, Smack denied access and tried to send an ICMPv6 packet to > inform a peer. > > I want to make sure if it is the root cause of this problem. > > > Besides, what is the purpose of setting skb->dev to NULL in > __sk_receive_skb() ? We can not keep a pointer to the device, the device might be dismantled/freed before socket backlog can be processed. Input processing is using RCU, meaning no refcount is taken on the device.
