From 9c09c65b5736c65a5d36e832f2609cd920e549cd Mon Sep 17 00:00:00 2001
From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 12 Jan 2011 09:55:22 +0100
Subject: [PATCH] --- yaml --- r: 230965 b: refs/heads/master c:
 9046e401e752dba784805a7818f99cc45a39cbff h: refs/heads/master i:   230963:
 116af82f30ed085959aba176280e4020d89c02cc v: v3

---
 [refs]                            |  2 +-
 trunk/arch/s390/include/asm/elf.h |  2 ++
 trunk/arch/s390/mm/mmap.c         | 11 ++++++++++-
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index 5511597c5a81..7efcb2067bcf 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7a63fa1a85d75756368d9c86fff5c1b193de991c
+refs/heads/master: 9046e401e752dba784805a7818f99cc45a39cbff
diff --git a/trunk/arch/s390/include/asm/elf.h b/trunk/arch/s390/include/asm/elf.h
index 354d42616c7e..9dbd3e7a3bc3 100644
--- a/trunk/arch/s390/include/asm/elf.h
+++ b/trunk/arch/s390/include/asm/elf.h
@@ -206,6 +206,8 @@ do {								\
 	current->mm->context.noexec == 0;		\
 })
 
+#define STACK_RND_MASK	0x7ffUL
+
 #define ARCH_DLINFO							    \
 do {									    \
 	if (vdso_enabled)						    \
diff --git a/trunk/arch/s390/mm/mmap.c b/trunk/arch/s390/mm/mmap.c
index 869efbaed3ea..5578740ab9c9 100644
--- a/trunk/arch/s390/mm/mmap.c
+++ b/trunk/arch/s390/mm/mmap.c
@@ -30,6 +30,15 @@
 #include <asm/pgalloc.h>
 #include <asm/compat.h>
 
+static unsigned long stack_maxrandom_size(void)
+{
+	if (!(current->flags & PF_RANDOMIZE))
+		return 0;
+	if (current->personality & ADDR_NO_RANDOMIZE)
+		return 0;
+	return STACK_RND_MASK << PAGE_SHIFT;
+}
+
 /*
  * Top of mmap area (just below the process stack).
  *
@@ -47,7 +56,7 @@ static inline unsigned long mmap_base(void)
 	else if (gap > MAX_GAP)
 		gap = MAX_GAP;
 
-	return STACK_TOP - (gap & PAGE_MASK);
+	return STACK_TOP - stack_maxrandom_size() - (gap & PAGE_MASK);
 }
 
 static inline int mmap_is_legacy(void)