From 1a5bf7b0adc203ff19d15d4be449359db5834116 Mon Sep 17 00:00:00 2001
From: Marsman1996 <lqliuyuwei@outlook.com>
Date: Wed, 25 Dec 2024 14:37:40 +0800
Subject: [PATCH] Add overflow check for given sigaltstack addr and size

---
 kernel/src/syscall/sigaltstack.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/src/syscall/sigaltstack.rs b/kernel/src/syscall/sigaltstack.rs
index cecf1b88..1a096821 100644
--- a/kernel/src/syscall/sigaltstack.rs
+++ b/kernel/src/syscall/sigaltstack.rs
@@ -106,6 +106,9 @@ impl TryFrom<stack_t> for SigStack {
         if stack.size < MINSTKSZ {
             return_errno_with_message!(Errno::ENOMEM, "stack size is less than MINSTKSZ");
         }
+        if stack.sp.checked_add(stack.size).is_none() {
+            return_errno_with_message!(Errno::EINVAL, "overflow for given stack addr and size");
+        }
 
         if flags.is_empty() {
             flags.insert(SigStackFlags::SS_ONSTACK);