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Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/sys-i386/signal.c3
-rw-r--r--arch/um/sys-x86_64/signal.c5
2 files changed, 5 insertions, 3 deletions
diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c
index 0709fc6670c..3f6acd66771 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 9edf114faf7..af2f017617b 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;