stdbuf: use helper function for file creation

Author: sylvestre

src/uu/stdbuf/Cargo.toml

@@ -23,7 +23,7 @@ path = "src/stdbuf.rs"
 clap = { workspace = true }
 libstdbuf = { package = "uu_stdbuf_libstdbuf", version = "0.6.0", path = "src/libstdbuf" }
 tempfile = { workspace = true }
-uucore = { workspace = true, features = ["parser-size"] }
+uucore = { workspace = true, features = ["parser-size", "fs"] }
 thiserror = { workspace = true }
 fluent = { workspace = true }
 

src/uu/stdbuf/src/stdbuf.rs

@@ -16,6 +16,7 @@ use tempfile::tempdir;
 use thiserror::Error;
 use uucore::error::{UResult, USimpleError, UUsageError};
 use uucore::format_usage;
+use uucore::fs::create_file_restrictive_perm;
 use uucore::parser::parse_size::parse_size_u64;
 use uucore::translate;
 
@@ -160,13 +161,12 @@ fn set_command_env(command: &mut process::Command, buffer_name: &str, buffer_typ
 
 #[cfg(not(feature = "feat_external_libstdbuf"))]
 fn get_preload_env(tmp_dir: &TempDir) -> UResult<(String, PathBuf)> {
-    use std::fs::File;
     use std::io::Write;
 
     let (preload, extension) = preload_strings()?;
     let inject_path = tmp_dir.path().join("libstdbuf").with_extension(extension);
 
-    let mut file = File::create(&inject_path)?;
+    let mut file = create_file_restrictive_perm(&inject_path, true)?;
     file.write_all(STDBUF_INJECT)?;
 
     Ok((preload.to_owned(), inject_path))