ksud: keep pwd after switch mnt ns

userspace/ksud/src/module.rs

@@ -333,6 +333,7 @@ fn _install_module(zip: &str) -> Result<()> {
     let mut buffer: Vec<u8> = Vec::new();
     let entry_path = PathBuf::from_str("module.prop")?;
     let zip_path = PathBuf::from_str(zip)?;
+    let zip_path = zip_path.canonicalize()?;
     zip_extract_file_to_memory(&zip_path, &entry_path, &mut buffer)?;
 
     let mut module_prop = HashMap::new();

userspace/ksud/src/utils.rs

@@ -103,7 +103,11 @@ pub fn switch_mnt_ns(pid: i32) -> Result<()> {
     use std::os::fd::AsRawFd;
     let path = format!("/proc/{pid}/ns/mnt");
     let fd = std::fs::File::open(path)?;
+    let current_dir = std::env::current_dir();
     let ret = unsafe { libc::setns(fd.as_raw_fd(), libc::CLONE_NEWNS) };
+    if let std::result::Result::Ok(current_dir) = current_dir {
+        let _ = std::env::set_current_dir(current_dir);
+    }
     ensure!(ret == 0, "switch mnt ns failed");
     Ok(())
 }