Date: Tue, 2 Sep 2003 13:11:50 +0800 From: "Kang Liu" <liukang@bjpu.edu.cn> To: <FreeBSD-gnats-submit@freebsd.org> Cc: ipfw@freebsd.org Subject: [patch]run ipfw2 with incomplete options will make a coredump Message-ID: <000001c37110$b7e92070$e04e70ca@lkatschool>
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>Submitter-Id: current-users
>Originator: Kang Liu
>Organization: Beijing University of Technology
>Confidential: no
>Synopsis: [patch]run ipfw2 with incomplete options will make a coredump
>Severity: critical
>Priority: high
>Category: bin
>Class: sw-bug
>Release: FreeBSD 4.9-PRERELEASE i386
>Environment:
System: FreeBSD cnproxy.bjpu.edu.cn 4.9-PRERELEASE FreeBSD 4.9-PRERELEASE #33: Sun Aug 31 15:58:08 CST 2003
root@cnproxy.bjpu.edu.cn:/usr/obj/usr/src/sys/CNPROXY i386
>Description:
run ipfw2 enable/disable with incomplete options will make a coredump with signal 10.
this problem can be reproduced on the latest 5.1current, I do not have a 4.8 running ipfw2,
but I think -stable with ipfw2 may have the same problem.
The src has been freezed for 4.9, but this problem is so serious, Can anyone test and commit it?
>How-To-Repeat:
on a latest 5.1 machine,run:
# ipfw disable (or ipfw enable)
Bus error (core dumped)
a ipfw.core would be produced
In /var/log/message:
date time hosename kernel: pid num (ipfw), uid 0: exited on signal 10 (core dumped)
>Fix:
I think a better way is to check "ac" instead of check "av".
--- ipfw2.c.orig Tue Sep 2 12:54:28 2003
+++ ipfw2.c Tue Sep 2 12:54:54 2003
@@ -1643,7 +1643,7 @@
ac--;
av++;
- if (*av == NULL) {
+ if (ac == 0) {
warnx("missing keyword to enable/disable\n");
} else if (strncmp(*av, "firewall", strlen(*av)) == 0) {
sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
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