From 604f846cd279f198cf0a9023c2685f48769f92f3 Mon Sep 17 00:00:00 2001
From: NAKAMURA Gou <go.nakamura.yw@hitachi-solutions.com>
Date: Mon, 14 Mar 2016 18:55:46 +0900
Subject: [PATCH] mincore: check [start..start+len) is in user region

---
 kernel/syscall.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/syscall.c b/kernel/syscall.c
index 23013f16..ae296495 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -3231,6 +3231,13 @@ SYSCALL_DECLARE(mincore)
 		dkprintf("mincore(0x%lx,0x%lx,%p): EINVAL\n", start, len, vec);
 		return -EINVAL;
 	}
+	if ((start < vm->region.user_start)
+			|| (vm->region.user_end <= start)
+			|| ((vm->region.user_end - start) < len))
+	{
+		dkprintf("mincore(0x%lx,0x%lx,%p): EINVAL\n", start, len, vec);
+		return -ENOMEM;
+	}
 
 	range = NULL;
 	up = vec;