Re: bin/57952 (dhcpcd(8) inexplicably terminated in the night)

[mlelstv%serpens.de@localhost (Michael van Elst)]

The following reply was made to PR bin/57952; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: bin/57952 (dhcpcd(8) inexplicably terminated in the night)
Date: Sat, 24 Feb 2024 07:46:29 -0000 (UTC)

 riastradh%NetBSD.org@localhost (Taylor R Campbell) writes:
 
 >  <daemon.err>Feb 23 23:21:35 nanocons dhcpcd[5931]: ps_inet_dodispatch: Co=
 >nnection reset by peer
 >  <daemon.err>Feb 23 23:21:35 nanocons dhcpcd[5931]: control_free: No such =
 >file or directory
 >  <daemon.err>Feb 23 23:21:35 nanocons dhcpcd[5931]: ps_sendpsmmsg: Destina=
 >tion address required
 >  <daemon.err>Feb 23 23:21:35 nanocons dhcpcd[5931]: ps_dostop: Destination=
 > address required
 
 >So I infer that the network proxy must have crashed, in my original
 >case.  But I don't see how to trigger a core dump.
 
 
 Try with kern.coredump.setid.dump=1 and kern.coredump.setid.path.
 
 change_root()
 {
 	...
 
         /* Broadcast our credentials to the process and other LWPs. */
         proc_crmod_leave(ncred, p->p_cred, true);
 }
 
 void  
 proc_crmod_leave(kauth_cred_t scred, kauth_cred_t fcred, bool sugid)
 {
 	...
 	if (sugid) {
                 /*
                  * Mark process as having changed credentials, stops
                  * tracing etc.
                  */
                 p->p_flag |= PK_SUGID;
         }
 	...
 }
 
 static int
 coredump(struct lwp *l, const char *pattern)
 {
 	...
         /*
          * Make sure the process has not set-id, to prevent data leaks,
          * unless it was specifically requested to allow set-id coredumps.
          */
         if (p->p_flag & PK_SUGID) {
                 if (!security_setidcore_dump) {
                         error = EPERM;
                         goto release;
                 }
                 pattern = security_setidcore_path;
         }
 }