wwpackage: validate cleanup directory after open

internal/wwpackage/package.ww

@@ -440,10 +440,24 @@ fn pkgmakedir(path: str) bool = {
 	return os.mkdir(path, 448i32) == 0;
 };
 
+// The coordinator removes only its minted temp root; validating the opened
+// inode keeps a replaced path from carrying cleanup outside that ownership.
 fn pkgremoveall(path: str) bool = {
-	if (!pkgisdir(path)) { return os.remove(path) == 0; };
+	let st: os.filestat;
+	match (os.lstat(&st, path)) {
+	case void => void;
+	case let e: os.oserror => return false;
+	};
+	if (!pkgmodeis(st.mode, os.mode.DIR)) { return os.remove(path) == 0; };
 	let fd: i32 = os.open(path, os.flag.RDONLY, 0i32);
 	if (fd < 0) { return false; };
+	let opened: os.filestat;
+	match (os.fstat(&opened, fd)) {
+	case void => void;
+	case let e: os.oserror => { os.close(fd); return false; };
+	};
+	if (!pkgmodeis(opened.mode, os.mode.DIR)
+	    || opened.inode != st.inode) { os.close(fd); return false; };
 	let ok: bool = true;
 	let buf: []u8 = alloc([], 8192u64)!;
 	buf.len = 8192;
@@ -476,7 +490,7 @@ fn pkgremoveall(path: str) bool = {
 		n = os.getdents64(fd, buf.ptr, 8192u64);
 	};
 	if (n < 0i64) { ok = false; };
-	os.close(fd);
+	if (os.close(fd) != 0) { ok = false; };
 	if (os.rmdir(path) != 0) { ok = false; };
 	return ok;
 };