From e91d1e5b7bb9e89faa4d212b56a2f507561ffe69 Mon Sep 17 00:00:00 2001
From: Tomoki Shirasawa <sira@popeye.cc.u-tokyo.ac.jp>
Date: Tue, 24 Feb 2015 17:20:52 +0900
Subject: [PATCH] stack of signal handler is not 16 byte align

refs #429
---
 arch/x86/kernel/syscall.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/syscall.c b/arch/x86/kernel/syscall.c
index 14e79418..d07305e9 100644
--- a/arch/x86/kernel/syscall.c
+++ b/arch/x86/kernel/syscall.c
@@ -495,6 +495,7 @@ do_signal(unsigned long rc, void *regs0, struct process *proc, struct sig_pendin
 			usp = (unsigned long *)regs->rsp;
 		}
 		sigsp = ((struct sigsp *)usp) - 1;
+		sigsp = (struct sigsp *)((unsigned long)sigsp & 0xfffffffffffffff0UL);
 		if(copy_to_user(proc, &sigsp->regs, regs, sizeof(struct x86_regs)) ||
 		   copy_to_user(proc, &sigsp->sigrc, &rc, sizeof(long))){
 			kfree(pending);