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DescriptionKonstantin Volkov
2011-09-06 19:58:00 UTC
Description of problem:
dhclient coredumps when the system has interface with NULL ifa_addr
---
[root@localhost ~]# ifconfig venet0
venet0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
BROADCAST POINTOPOINT NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
[root@localhost client]# gdb --args ./dhclient eth0
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-48.el6)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /root/rpmbuild/BUILD/dhcp-4.1.1-P1/client/dhclient...done.
(gdb) run
Starting program: /root/rpmbuild/BUILD/dhcp-4.1.1-P1/client/dhclient eth0
Detaching after fork from child process 32611.
-1207741920 -1207741892
-1207741764 0
Program received signal SIGSEGV, Segmentation fault.
0xb7fb1c0f in get_hw_addr (info=0xb800c608) at lpf.c:639
---
the similar BUG: https://bugzilla.redhat.com/show_bug.cgi?id=731999
after this patch:
---
[root@localhost dhcp-4.1.1-P1]# diff -u ./common/lpf.c.orig ./common/lpf.c
--- ./common/lpf.c.orig 2011-09-06 23:49:26.000000000 +0400
+++ ./common/lpf.c 2011-09-06 23:49:48.000000000 +0400
@@ -634,6 +634,9 @@
for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
+ if (ifa->ifa_addr == NULL)
+ continue;
+
if (ifa->ifa_addr->sa_family != AF_PACKET)
continue;
---
All is OK
Version-Release number of selected component (if applicable):
dhcp-4.1.1-19.P1.el6
How reproducible:
100%
Steps to Reproduce:
1. Run dhclient eth0 inside Virtuozzo or OpenVZ Container
2. Get the SegFault
Actual results:
SegFault
Expected results:
No SegFault, eth0 get the IP
Please fix.
Thank you for the report.
This is duplicate of bug #731990 which would be fixed in forthcoming RHEL-6.2.
*** This bug has been marked as a duplicate of bug 731990 ***
Description of problem: dhclient coredumps when the system has interface with NULL ifa_addr --- [root@localhost ~]# ifconfig venet0 venet0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 BROADCAST POINTOPOINT NOARP MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) [root@localhost client]# gdb --args ./dhclient eth0 GNU gdb (GDB) Red Hat Enterprise Linux (7.2-48.el6) Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i686-redhat-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /root/rpmbuild/BUILD/dhcp-4.1.1-P1/client/dhclient...done. (gdb) run Starting program: /root/rpmbuild/BUILD/dhcp-4.1.1-P1/client/dhclient eth0 Detaching after fork from child process 32611. -1207741920 -1207741892 -1207741764 0 Program received signal SIGSEGV, Segmentation fault. 0xb7fb1c0f in get_hw_addr (info=0xb800c608) at lpf.c:639 --- the similar BUG: https://bugzilla.redhat.com/show_bug.cgi?id=731999 after this patch: --- [root@localhost dhcp-4.1.1-P1]# diff -u ./common/lpf.c.orig ./common/lpf.c --- ./common/lpf.c.orig 2011-09-06 23:49:26.000000000 +0400 +++ ./common/lpf.c 2011-09-06 23:49:48.000000000 +0400 @@ -634,6 +634,9 @@ for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) { + if (ifa->ifa_addr == NULL) + continue; + if (ifa->ifa_addr->sa_family != AF_PACKET) continue; --- All is OK Version-Release number of selected component (if applicable): dhcp-4.1.1-19.P1.el6 How reproducible: 100% Steps to Reproduce: 1. Run dhclient eth0 inside Virtuozzo or OpenVZ Container 2. Get the SegFault Actual results: SegFault Expected results: No SegFault, eth0 get the IP Please fix.