From e86ffb0b57da12c2506ee01a37c78d76e3ef6d39 Mon Sep 17 00:00:00 2001
From: NAKAMURA Gou <go.nakamura.yw@hitachi-solutions.com>
Date: Thu, 19 Dec 2013 14:03:08 +0900
Subject: [PATCH] do write back only MAP_SHARED pages

Fix a problem that cause write reference to a MAP_PRIVATE mapping to
change the underlying file.
---
 kernel/process.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/process.c b/kernel/process.c
index adb53958..5afc144b 100644
--- 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);
 		}