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authorIan Wisbon <ian.wisbon@timesys.com>2011-02-14 16:41:03 -0500
committerIan Wisbon <ian.wisbon@timesys.com>2011-02-14 16:41:03 -0500
commit8a83780a187ba1961380814eaf9c503043345d12 (patch)
tree80f5d89cca49330e137688c72fb10c9f42dc5663 /arch/x86/mm/mmap.c
parent14a4057959f8ee0a2249eb2abd64fd6b1f571d98 (diff)
Digi Release Code from del-5.6/main2.6.31-digi-201102141643
Diffstat (limited to 'arch/x86/mm/mmap.c')
-rw-r--r--arch/x86/mm/mmap.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
index 165829600566..c8191defc38a 100644
--- a/arch/x86/mm/mmap.c
+++ b/arch/x86/mm/mmap.c
@@ -29,13 +29,26 @@
#include <linux/random.h>
#include <linux/limits.h>
#include <linux/sched.h>
+#include <asm/elf.h>
+
+static unsigned int stack_maxrandom_size(void)
+{
+ unsigned int max = 0;
+ if ((current->flags & PF_RANDOMIZE) &&
+ !(current->personality & ADDR_NO_RANDOMIZE)) {
+ max = ((-1U) & STACK_RND_MASK) << PAGE_SHIFT;
+ }
+
+ return max;
+}
+
/*
* Top of mmap area (just below the process stack).
*
- * Leave an at least ~128 MB hole.
+ * Leave an at least ~128 MB hole with possible stack randomization.
*/
-#define MIN_GAP (128*1024*1024)
+#define MIN_GAP (128*1024*1024UL + stack_maxrandom_size())
#define MAX_GAP (TASK_SIZE/6*5)
/*