Apply by doing
       cd /usr/src
       patch -p0 <022_userltd.patch
And then rebuild your kernel.

Index: sys/arch/i386/i386/sys_machdep.c
===================================================================
RCS file: /cvs/src/sys/arch/i386/i386/sys_machdep.c,v
retrieving revision 1.8
retrieving revision 1.9
diff -u -r1.8 -r1.9
--- sys/arch/i386/i386/sys_machdep.c    2000/06/23 02:14:36     1.8
+++ sys/arch/i386/i386/sys_machdep.c    2001/01/19 18:31:30     1.9
@@ -240,6 +240,17 @@
                       break;
               case SDT_SYS286CGT:
               case SDT_SYS386CGT:
+                       /*
+                        * Only allow call gates targeting a segment
+                        * in the LDT or a user segment in the fixed
+                        * part of the gdt.  Segments in the LDT are
+                        * constrained (below) to be user segments.
+                        */
+                       if (desc.gd.gd_p != 0 && !ISLDT(desc.gd.gd_selector) &&
+                           ((IDXSEL(desc.gd.gd_selector) >= NGDT) ||
+                            (gdt[IDXSEL(desc.gd.gd_selector)].sd.sd_dpl !=
+                                SEL_UPL)))
+                               return (EACCES);
                       /* Can't replace in use descriptor with gate. */
                       if (n == fsslot || n == gsslot)
                               return (EBUSY);

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