svn commit: r198721 - head/sys/vm
Alan Cox
alc at FreeBSD.org
Sat Oct 31 17:39:56 UTC 2009
Author: alc
Date: Sat Oct 31 17:39:56 2009
New Revision: 198721
URL: http://svn.freebsd.org/changeset/base/198721
Log:
Correct an error in vm_fault_copy_entry() that has existed since the first
version of this file. When a process forks, any wired pages are immediately
copied because copy-on-write is not supported for wired pages. In other
words, the child process is given its own private copy of each wired page
from its parent's address space. Unfortunately, to date, these copied pages
have been mapped into the child's address space with the wrong permissions,
typically VM_PROT_ALL. This change corrects the permissions.
Reviewed by: kib
Modified:
head/sys/vm/vm_fault.c
Modified: head/sys/vm/vm_fault.c
==============================================================================
--- head/sys/vm/vm_fault.c Sat Oct 31 17:28:08 2009 (r198720)
+++ head/sys/vm/vm_fault.c Sat Oct 31 17:39:56 2009 (r198721)
@@ -1179,7 +1179,7 @@ vm_fault_copy_entry(vm_map_t dst_map, vm
dst_object->uip = dst_entry->uip;
dst_entry->uip = NULL;
}
- access = prot = dst_entry->max_protection;
+ access = prot = dst_entry->protection;
/*
* If not an upgrade, then enter the mappings in the pmap as
* read and/or execute accesses. Otherwise, enter them as
More information about the svn-src-all
mailing list