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Subject: [Bug 196474] jls causes kernel panic
Date: Sun, 04 Jan 2015 04:45:10 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196474

--- Comment #4 from Oliver Pinter <op@freebsd.org> ---
please try the following path:

--- sys/kern/vfs_mount.c.orig   2015-01-04 05:38:40.000000000 +0100
+++ sys/kern/vfs_mount.c        2015-01-04 05:38:05.000000000 +0100
@@ -1643,7 +1643,7 @@
                if (opt->value == NULL)
                        opt->len = len;
                else {
-                       if (opt->len < len)
+                       if (len < 0 || opt->len < len)
                                return (EINVAL);
                        opt->len = len;
                        bcopy(value, opt->value, len);

This fixed the problem for me:
root@opn ~# jail -n crashme -c ip4=new persist
root@opn ~# jls
   JID  IP Address      Hostname                      Path
jls: jail_get: Invalid argument

Btw, this is a possible DoS in typical jail based hosting environments.

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