parisc,metag: Fix crashes due to stack randomization on stack-grows-upwards architectures

[sfrench/cifs-2.6.git] / arch / parisc / kernel / sys_parisc.c

diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index e1ffea2f9a0b05ccda844969dcb7c519ab17077a..5aba01ac457ffc5d4823cf09c071f02f00a1d015 100644 (file)
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -77,6 +77,9 @@ static unsigned long mmap_upper_limit(void)
        if (stack_base > STACK_SIZE_MAX)
                stack_base = STACK_SIZE_MAX;
 
+       /* Add space for stack randomization. */
+       stack_base += (STACK_RND_MASK << PAGE_SHIFT);
+
        return PAGE_ALIGN(STACK_TOP - stack_base);
 }