Author: glebius
Date: Fri Oct 30 13:05:39 2015
New Revision: 290194
URL: https://svnweb.freebsd.org/changeset/base/290194
Log:
MFC r287591 by kib:
There is no reason in the current kernel to disallow write access to
the COW wired entry if the entry permissions allow it. Remove the check.
Modified:
stable/9/sys/vm/vm_map.c
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/vm/vm_map.c
==============================================================================
--- stable/9/sys/vm/vm_map.c Fri Oct 30 12:37:40 2015 (r290193)
+++ stable/9/sys/vm/vm_map.c Fri Oct 30 13:05:39 2015 (r290194)
@@ -3878,12 +3878,10 @@ RetryLookup:;
vm_map_unlock_read(map);
return (KERN_PROTECTION_FAILURE);
}
- if ((entry->eflags & MAP_ENTRY_USER_WIRED) &&
- (entry->eflags & MAP_ENTRY_COW) &&
- (fault_type & VM_PROT_WRITE)) {
- vm_map_unlock_read(map);
- return (KERN_PROTECTION_FAILURE);
- }
+ KASSERT((prot & VM_PROT_WRITE) == 0 || (entry->eflags &
+ (MAP_ENTRY_USER_WIRED | MAP_ENTRY_NEEDS_COPY)) !=
+ (MAP_ENTRY_USER_WIRED | MAP_ENTRY_NEEDS_COPY),
+ ("entry %p flags %x", entry, entry->eflags));
if ((fault_typea & VM_PROT_COPY) != 0 &&
(entry->max_protection & VM_PROT_WRITE) == 0 &&
(entry->eflags & MAP_ENTRY_COW) == 0) {
@@ -4037,10 +4035,6 @@ vm_map_lookup_locked(vm_map_t *var_map,
fault_type &= VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;
if ((fault_type & prot) != fault_type)
return (KERN_PROTECTION_FAILURE);
- if ((entry->eflags & MAP_ENTRY_USER_WIRED) &&
- (entry->eflags & MAP_ENTRY_COW) &&
- (fault_type & VM_PROT_WRITE))
- return (KERN_PROTECTION_FAILURE);
/*
* If this page is not pageable, we have to get it for all possible
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