From f730a86d225700d26218c2ffe4fa8df4e4bf1fae Mon Sep 17 00:00:00 2001
From: liwenxiang1 <liwenxiang1@xiaomi.com>
Date: Fri, 18 Jul 2025 15:06:54 +0800
Subject: [PATCH] arch/x64: Fix crash issue after enabling KASAN

After up_fork calls the x86_64_fork function, the rsp must be 16-byte aligned; otherwise, the movaps %xmm0, (%rsp) instruction may cause a crash.

Signed-off-by: liwenxiang1 <liwenxiang1@xiaomi.com>
---
 arch/x86_64/src/common/fork.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86_64/src/common/fork.S b/arch/x86_64/src/common/fork.S
index f526a5fa956..1621b560474 100644
--- a/arch/x86_64/src/common/fork.S
+++ b/arch/x86_64/src/common/fork.S
@@ -118,10 +118,14 @@ up_fork:
     pushq   %r12
     movq    %rsp, %rdi
 
+    subq    $8, %rsp
+
     /* call function */
 
     callq x86_64_fork
 
+    addq    $8, %rsp
+
     /* Do not modify return value %rax */
     /* Restore non-volatile registers */