#1106 Coredumps are not generated when running as non root

[Adrian Szwej]

When running opensaf as non root; there are no coredumps generated during crash.
I have enabled coredumps in opensafd script.
Running kill -4 on any process running as opensaf does not generate coredump under /var/crash/opensaf
Checking running opensaf process limit

root@SC-1:/tmp# cat /proc/3657/limits 
Limit                     Soft Limit           Hard Limit           Units     
Max core file size        unlimited            unlimited            bytes

Running kill -4 on amfnd or smfnd which are running as root generates coredumps in correct way.

[Sirisha Alla]

I think this is same as https://sourceforge.net/p/opensaf/tickets/230/

[Adrian Szwej]

The following patch enable coredump after setuid.

diff -r ead18326c13b osaf/libs/core/common/daemon.c
--- a/osaf/libs/core/common/daemon.c    Fri Sep 26 08:53:42 2014 +0200
+++ b/osaf/libs/core/common/daemon.c    Wed Oct 01 23:14:08 2014 +0000
@@ -31,6 +31,7 @@
 #include <limits.h>
 #include <sys/stat.h>
 #include <sys/file.h>
+#include <sys/prctl.h>

 #include <configmake.h>

@@ -324,6 +325,7 @@
                syslog(LOG_ERR, "setuid failed, uid=%d (%s)", pw->pw_uid, strerror(errno));
                exit(EXIT_FAILURE);
            }
+                        prctl(PR_SET_DUMPABLE, 1,0,0,0);
        } else {
            syslog(LOG_ERR, "invalid user name %s", __runas_username);
            exit(EXIT_FAILURE);
diff -r ead18326c13b osaf/services/infrastructure/nid/scripts/opensafd.in
--- a/osaf/services/infrastructure/nid/scripts/opensafd.in  Fri Sep 26 08:53:42 2014 +0200
+++ b/osaf/services/infrastructure/nid/scripts/opensafd.in  Wed Oct 01 23:14:08 2014 +0000
@@ -98,12 +98,19 @@
 }

 enable_coredump() {
+        core_destination="/var/crash/opensaf"
    core_size="unlimited"
    core_pattern="/var/crash/opensaf/core_%t.%e.%p"

-   if [ ! -d /var/crash/opensaf ]; then
-       mkdir -p /var/crash/opensaf
-   fi
+        if [ ! -d ${core_destination} ]; then
+                mkdir -p ${core_destination}
+                if [ -n "$OPENSAF_GROUP" ]; then
+                        getent group $OPENSAF_GROUP > /dev/null && chgrp $OPENSAF_GROUP ${core_destination}
+                fi
+                if [ -n "$OPENSAF_USER" ]; then
+                        getent passwd $OPENSAF_USER > /dev/null && chown $OPENSAF_USER ${core_destination}
+                fi
+        fi

    if [ `ulimit -c` = 0 ]; then
        ulimit -c $core_size

[Hans Nordebäck]

changeset: 6495:3f19d67c5fc6
tag: tip
user: Hans Nordeback hans.nordeback@ericsson.com
date: Mon Apr 27 16:55:13 2015 +0200
files: osaf/libs/core/common/daemon.c
description:
base: Coredumps are not generated when running as non root [#1106]