2 files changed, 5 insertions, 3 deletions

diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c
index 0709fc6670c2..3f6acd667717 100644
--- a/arch/um/sys-i386/signal.c
+++ b/arch/um/sys-i386/signal.c
@@ -219,7 +219,8 @@ int setup_signal_stack_sc(unsigned long stack_top, int sig,
         unsigned long save_sp = PT_REGS_SP(regs);
         int err = 0;
 
-        stack_top &= -8UL;
+        /* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */
+        stack_top = ((stack_top + 4) & -16UL) - 4;
         frame = (struct sigframe __user *) stack_top - 1;
         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
                 return 1;
diff --git a/arch/um/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c
index 9edf114faf79..af2f017617b4 100644
--- a/arch/um/sys-x86_64/signal.c
+++ b/arch/um/sys-x86_64/signal.c
@@ -191,8 +191,9 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
         struct task_struct *me = current;
 
         frame = (struct rt_sigframe __user *)
-                round_down(stack_top - sizeof(struct rt_sigframe), 16) - 8;
-        frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128);
+                round_down(stack_top - sizeof(struct rt_sigframe), 16);
+        /* Subtract 128 for a red zone and 8 for proper alignment */
+        frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8);
 
         if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate)))
                 goto out;