On Sun, Dec 02, 2018 at 11:15:03AM +0100, Claudio Jeker wrote: > On Sun, Dec 02, 2018 at 09:29:23AM +0100, Claudio Jeker wrote: > > On Sat, Dec 01, 2018 at 06:44:31PM -0800, Greg Steuck wrote: > > > This thwarts the reproducer. Again, I don't know if the invariants are > > > getting violated somewhere else and the patch below is simply papering > > > over > > > the symptoms. > > > > I would like to better understand how we get so far with a socket where > > so_pcb is not initiallized. This and also the other bug are baisically the > > same. The stack assumes that after a successful socket() operation both > > socket and pcb exist and are a connected. Since this seems to not be > > the case it is important to catch those errors further up in uipc_socket.c > > before passing down into protocol specific functions. > > > > So the issue is the double connect() call on the SOCk_RAW socket. > The second connect is calling PRU_DISCONNECT which in the end does a > FALLTHROUGH into PRU_ABORT which removes the inp by calling > in_pcbdetach(). > > I think the proper fix is to not have this FALLTHROUGH and just call > soisdisconnected(). Maybe inp->inp_faddr should also be reset to 0. > > This will fix also other double connect() SOCk_RAW crashes you spotted.
The version I will commit will also reset inp->inp_faddr since this is what other protos are doing and it is more correct anyway. -- :wq Claudio Index: raw_ip.c =================================================================== RCS file: /cvs/src/sys/netinet/raw_ip.c,v retrieving revision 1.115 diff -u -p -r1.115 raw_ip.c --- raw_ip.c 10 Nov 2018 18:40:34 -0000 1.115 +++ raw_ip.c 3 Dec 2018 08:13:24 -0000 @@ -385,7 +385,9 @@ rip_usrreq(struct socket *so, int req, s error = ENOTCONN; break; } - /* FALLTHROUGH */ + soisdisconnected(so); + inp->inp_faddr.s_addr = INADDR_ANY; + break; case PRU_ABORT: soisdisconnected(so); if (inp == NULL)