[S390] Randomise the brk region

Randomize heap address like other architectures do already.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 21 insertions, 0 deletions

diff --git a/arch/s390/include/asm/elf.h b/arch/s390/include/asm/elf.h
index 9dbd3e7a3bc3..457fb7c16236 100644
--- a/arch/s390/include/asm/elf.h
+++ b/arch/s390/include/asm/elf.h
@@ -220,4 +220,7 @@ struct linux_binprm;
 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 int arch_setup_additional_pages(struct linux_binprm *, int);
 
+extern unsigned long arch_randomize_brk(struct mm_struct *mm);
+#define arch_randomize_brk arch_randomize_brk
+
 #endif
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 38ff69e562c8..26d48fe72999 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -341,3 +341,21 @@ unsigned long arch_align_stack(unsigned long sp)
                 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;
+}