From b141cdaad22bf32f2a52f867751db9effa376eb7 Mon Sep 17 00:00:00 2001
From: 4lDO2 <4lDO2@protonmail.com>
Date: Sun, 10 Jul 2022 15:21:33 +0200
Subject: [PATCH] Fail if funmap's length isn't page size divisible.

---
 src/syscall/fs.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/syscall/fs.rs b/src/syscall/fs.rs
index 40ea1dd..38e2cd3 100644
--- a/src/syscall/fs.rs
+++ b/src/syscall/fs.rs
@@ -471,7 +471,7 @@ pub fn fstat(fd: FileHandle, stat: &mut Stat) -> Result<usize> {
 pub fn funmap(virtual_address: usize, length: usize) -> Result<usize> {
     if virtual_address == 0 || length == 0 {
         return Ok(0);
-    } else if virtual_address % PAGE_SIZE != 0 {
+    } else if virtual_address % PAGE_SIZE != 0 || length % PAGE_SIZE != 0 {
         return Err(Error::new(EINVAL));
     }