February 27, 1991

Dear Colleague:

Enclosed are several important changes that should be applied to your
4.3BSD-Reno kernel.

Sincerely yours,

Computer Systems Research Group
*** /sys/kern/kern_fork.c.old Wed Feb 27 14:20:05 1991
--- /sys/kern/kern_fork.c.new Wed Feb 27 14:20:12 1991
***************
*** 182,188 ****
--- 182,190 ----
 bcopy(rip->p_logname, rpp->p_logname, MAXLOGNAME);
 rpp->p_uid = rip->p_uid;
 rpp->p_ruid = rip->p_ruid;
+ rpp->p_svuid = rip->p_svuid;
 rpp->p_rgid = rip->p_rgid;
+ rpp->p_svgid = rip->p_svgid;
 rpp->p_pgrp = rip->p_pgrp;
 rpp->p_pgrpnxt = rip->p_pgrpnxt;
 rip->p_pgrpnxt = rpp;
.bp
*** /sys/kern/kern_malloc.c.old Wed Feb 27 14:32:33 1991
--- /sys/kern/kern_malloc.c.new Wed Feb 27 14:32:37 1991
***************
*** 48,54 ****
 register struct kmemusage *kup;
 long indx, npg, alloc, allocsize;
 int s;
! caddr_t va, cp;
 #ifdef KMEMSTATS
 register struct kmemstats *ksp = &kmemstats[type];
 
--- 48,54 ----
 register struct kmemusage *kup;
 long indx, npg, alloc, allocsize;
 int s;
! caddr_t va, cp, savedlist;
 #ifdef KMEMSTATS
 register struct kmemstats *ksp = &kmemstats[type];
 
***************
*** 100,109 ****
 kup->ku_freecnt = kbp->kb_elmpercl;
 kbp->kb_totalfree += kbp->kb_elmpercl;
 #endif
 kbp->kb_next = va + (npg * NBPG) - allocsize;
 for (cp = kbp->kb_next; cp > va; cp -= allocsize)
 *(caddr_t *)cp = cp - allocsize;
! *(caddr_t *)cp = NULL;
 }
 va = kbp->kb_next;
 kbp->kb_next = *(caddr_t *)va;
--- 100,115 ----
 kup->ku_freecnt = kbp->kb_elmpercl;
 kbp->kb_totalfree += kbp->kb_elmpercl;
 #endif
+ /*
+ * Just in case we blocked while allocating memory,
+ * and someone else also allocated memory for this
+ * bucket, don't assume the list is still empty.
+ */
+ savedlist = kbp->kb_next;
 kbp->kb_next = va + (npg * NBPG) - allocsize;
 for (cp = kbp->kb_next; cp > va; cp -= allocsize)
 *(caddr_t *)cp = cp - allocsize;
! *(caddr_t *)cp = savedlist;
 }
 va = kbp->kb_next;
 kbp->kb_next = *(caddr_t *)va;
.bp
*** /sys/nfs/nfs_vnops.c.old Wed Feb 27 14:35:50 1991
--- /sys/nfs/nfs_vnops.c.new Wed Feb 27 14:35:58 1991
***************
*** 1508,1527 ****
 /*
 * Set b_proc. It seems a bit silly to do it here, but since bread()
 * doesn't set it, I will.
! * Set b_proc == NULL for asynchronous reads, since these may still
 * be hanging about after the process terminates.
 */
! if ((bp->b_flags & (B_READ | B_ASYNC)) == (B_READ | B_ASYNC))
 bp->b_proc = (struct proc *)0;
 else
 bp->b_proc = u.u_procp;
 
 /*
! * If an i/o daemon is waiting
 * queue the request, wake it up and wait for completion
! * otherwise just do it ourselves
 */
! for (i = 0; i < nfs_asyncdaemons; i++) {
 if (rp = nfs_iodwant[i]) {
 /*
 * Ensure that the async_daemon is still waiting here
--- 1508,1528 ----
 /*
 * Set b_proc. It seems a bit silly to do it here, but since bread()
 * doesn't set it, I will.
! * Set b_proc == NULL for asynchronous ops, since these may still
 * be hanging about after the process terminates.
 */
! if (bp->b_flags & B_ASYNC)
 bp->b_proc = (struct proc *)0;
 else
 bp->b_proc = u.u_procp;
 
 /*
! * If the op is asynchronous and an i/o daemon is waiting
 * queue the request, wake it up and wait for completion
! * otherwise just do it ourselves.
 */
! if (bp->b_proc == (struct proc *)NULL)
! for (i = 0; i < nfs_asyncdaemons; i++) {
 if (rp = nfs_iodwant[i]) {
 /*
 * Ensure that the async_daemon is still waiting here