Fix the following problem:

When creating new processes (or performing exec), the new page
directory is initialized too early.  The kernel might grow before
p_vmspace is initialized for the new process.  Since pmap_growkernel
doesn't yet know about the new page directory, it isn't updated, and
subsequent use causes a failure.

The fix is (1) to clear p_vmspace early, to stop pmap_growkernel
from stomping on memory, and (2) to defer part of the initialization
of new page directories until p_vmspace is initialized.

PR:		kern/12378
Submitted by:	tegge
Reviewed by:	dfr

1 files changed, 3 insertions, 1 deletions

diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c
index cbe2a2d..bfebc9c 100644
--- a/sys/vm/vm_map.c
+++ b/sys/vm/vm_map.c
@@ -61,7 +61,7 @@
  * any improvements or extensions that they make and grant Carnegie the
  * rights to redistribute these changes.
  *
- * $Id: vm_map.c,v 1.171 1999/07/01 19:53:41 peter Exp $
+ * $Id: vm_map.c,v 1.172 1999/07/11 18:30:31 alc Exp $
  */
 
 /*
@@ -2351,6 +2351,7 @@ vmspace_exec(struct proc *p) {
 	 */
 	vmspace_free(oldvmspace);
 	p->p_vmspace = newvmspace;
+	pmap_pinit2(vmspace_pmap(newvmspace));
 	if (p == curproc)
 		pmap_activate(p);
 }
@@ -2370,6 +2371,7 @@ vmspace_unshare(struct proc *p) {
 	newvmspace = vmspace_fork(oldvmspace);
 	vmspace_free(oldvmspace);
 	p->p_vmspace = newvmspace;
+	pmap_pinit2(vmspace_pmap(newvmspace));
 	if (p == curproc)
 		pmap_activate(p);
 }