chdir: Fix SMAP violation

Signed-off-by: Dennis Bonke <[email protected]>

Author: Dennisbonke

src/aero_kernel/src/syscall/fs.rs

@@ -139,7 +139,7 @@ pub fn close(fd: usize) -> Result<usize, AeroSyscallError> {
 
 pub fn chdir(path: usize, size: usize) -> Result<usize, AeroSyscallError> {
     let buffer = validate_str(path as *mut u8, size).ok_or(AeroSyscallError::EINVAL)?;
-    let inode = fs::lookup_path(Path::new(buffer))?;
+    let inode = controlregs::with_userspace_access(||fs::lookup_path(Path::new(buffer)))?;
 
     if !inode.inode().metadata()?.is_directory() {
         // A component of path is not a directory.