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authorIngo Molnar <mingo@elte.hu>2009-09-19 11:27:32 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-19 11:28:41 +0200
commit929bf0d0156562ce631728b6fa53d68004d456d2 (patch)
tree739063990a8077b29ef97e69d73bce94573daae4 /arch/x86/mm/mmap.c
parentsched_clock: Make it NMI safe (diff)
parentpty_write: don't do a tty_wakeup() when the buffers are full (diff)
downloadlinux-dev-929bf0d0156562ce631728b6fa53d68004d456d2.tar.xz
linux-dev-929bf0d0156562ce631728b6fa53d68004d456d2.zip
Merge branch 'linus' into perfcounters/core
Merge reason: Bring in tracing changes we depend on. Signed-off-by: Ingo Molnar <mingo@elte.hu>
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)
/*