From b6a248b75a3a9d6da03ab21c9cee4d0cf11ee929 Mon Sep 17 00:00:00 2001 From: alc Date: Sat, 31 Oct 2009 17:39:56 +0000 Subject: 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 --- sys/vm/vm_fault.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'sys/vm') diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c index 68057fb..de87183 100644 --- a/sys/vm/vm_fault.c +++ b/sys/vm/vm_fault.c @@ -1179,7 +1179,7 @@ vm_fault_copy_entry(vm_map_t dst_map, vm_map_t src_map, 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 -- cgit v1.1