Apply by doing:
       cd /usr/src/sys/kern
       patch < poll.patch

And then rebuild your kernel.

===================================================================
RCS file: /usr/OpenBSD/cvs/src/sys/kern/sys_generic.c,v
retrieving revision 1.17
retrieving revision 1.18
diff -u -r1.17 -r1.18
--- src/sys/kern/sys_generic.c  1999/02/14 21:11:01     1.17
+++ src/sys/kern/sys_generic.c  1999/03/22 02:22:15     1.18
@@ -807,13 +807,18 @@
       register_t *retval;
{
       struct sys_poll_args *uap = v;
-       size_t sz = sizeof(struct pollfd) * SCARG(uap, nfds);
+       size_t sz;
       struct pollfd *pl;
       int msec = SCARG(uap, timeout);
       struct timeval atv;
       int timo, ncoll, i, s, error, error2;
       extern int nselcoll, selwait;

+       /* XXX constrain; This may not match standards */
+       if (SCARG(uap, nfds) > p->p_fd->fd_nfiles)
+               SCARG(uap, nfds) = p->p_fd->fd_nfiles;
+       sz = sizeof(struct pollfd) * SCARG(uap, nfds);
+
       pl = (struct pollfd *) malloc(sz, M_TEMP, M_WAITOK);

       if ((error = copyin(SCARG(uap, fds), pl, sz)) != 0)

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