diff options
Diffstat (limited to 'sys/vm/vm_map.c')
| -rw-r--r-- | sys/vm/vm_map.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c index 1166712..06ae63e 100644 --- a/sys/vm/vm_map.c +++ b/sys/vm/vm_map.c @@ -1805,10 +1805,10 @@ int vm_map_protect(vm_map_t map, vm_offset_t start, vm_offset_t end, vm_prot_t new_prot, boolean_t set_max) { - vm_map_entry_t current; - vm_map_entry_t entry; + vm_map_entry_t current, entry; vm_object_t obj; struct uidinfo *uip; + vm_prot_t old_prot; vm_map_lock(map); @@ -1897,9 +1897,8 @@ vm_map_protect(vm_map_t map, vm_offset_t start, vm_offset_t end, */ current = entry; while ((current != &map->header) && (current->start < end)) { - vm_prot_t old_prot; - old_prot = current->protection; + if (set_max) current->protection = (current->max_protection = new_prot) & @@ -1907,6 +1906,13 @@ vm_map_protect(vm_map_t map, vm_offset_t start, vm_offset_t end, else current->protection = new_prot; + if ((current->eflags & (MAP_ENTRY_COW | MAP_ENTRY_USER_WIRED)) + == (MAP_ENTRY_COW | MAP_ENTRY_USER_WIRED) && + (current->protection & VM_PROT_WRITE) != 0 && + (old_prot & VM_PROT_WRITE) == 0) { + vm_fault_copy_entry(map, map, current, current, NULL); + } + /* * Update physical map if necessary. Worry about copy-on-write * here. |
