do write back only MAP_SHARED pages

Fix a problem that cause write reference to a MAP_PRIVATE mapping to change the underlying file.
2013-12-19 14:03:08 +09:00
parent 8411f353fe
commit e86ffb0b57
1 changed files with 2 additions and 1 deletions
--- a/kernel/process.c
+++ b/kernel/process.c
@ -363,7 +363,8 @@ int free_process_memory_range(struct process_vm *vm, struct vm_range *range)
 			memobj_lock(range->memobj);
 		}
 		error = ihk_mc_pt_free_range(vm->page_table,
-				(void *)start, (void *)end, range->memobj);
+				(void *)start, (void *)end,
+				(range->flag & VR_PRIVATE)? NULL: range->memobj);
 		if (range->memobj) {
 			memobj_unlock(range->memobj);
 		}