Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6

[mv-sheeva.git] / arch / s390 / kernel / process.c

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 6ba42222b5423d6e2a6e294f5bbcfcdb9529759a..a895e69379f75233a84ab98681fbd9dc6421fbe1 100644 (file)
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -30,9 +30,11 @@
 #include <linux/tick.h>
 #include <linux/elfcore.h>
 #include <linux/kernel_stat.h>
+#include <linux/personality.h>
 #include <linux/syscalls.h>
 #include <linux/compat.h>
 #include <linux/kprobes.h>
+#include <linux/random.h>
 #include <asm/compat.h>
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -332,3 +334,39 @@ unsigned long get_wchan(struct task_struct *p)
        }
        return 0;
 }
+
+unsigned long arch_align_stack(unsigned long sp)
+{
+       if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+               sp -= get_random_int() & ~PAGE_MASK;
+       return sp & ~0xf;
+}
+
+static inline unsigned long brk_rnd(void)
+{
+       /* 8MB for 32bit, 1GB for 64bit */
+       if (is_32bit_task())
+               return (get_random_int() & 0x7ffUL) << PAGE_SHIFT;
+       else
+               return (get_random_int() & 0x3ffffUL) << PAGE_SHIFT;
+}
+
+unsigned long arch_randomize_brk(struct mm_struct *mm)
+{
+       unsigned long ret = PAGE_ALIGN(mm->brk + brk_rnd());
+
+       if (ret < mm->brk)
+               return mm->brk;
+       return ret;
+}
+
+unsigned long randomize_et_dyn(unsigned long base)
+{
+       unsigned long ret = PAGE_ALIGN(base + brk_rnd());
+
+       if (!(current->flags & PF_RANDOMIZE))
+               return base;
+       if (ret < base)
+               return base;
+       return ret;
+}