ossl config: shareable when frozen

should proobably be initialized as frozen, given no state modifications

ext/openssl/ossl_config.c

@@ -22,7 +22,7 @@ static const rb_data_type_t ossl_config_type = {
     {
         0, nconf_free,
     },
-    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
+    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_FROZEN_SHAREABLE,
 };
 
 CONF *
@@ -87,6 +87,7 @@ config_s_parse(VALUE klass, VALUE str)
 
     bio = ossl_obj2bio(&str);
     config_load_bio(conf, bio); /* Consumes BIO */
+    rb_obj_freeze(obj);
     return obj;
 }
 
@@ -136,14 +137,15 @@ config_initialize(int argc, VALUE *argv, VALUE self)
     VALUE filename;
 
     /* 0-arguments call has no use-case, but is kept for compatibility */
-    rb_scan_args(argc, argv, "01", &filename);
     rb_check_frozen(self);
+    rb_scan_args(argc, argv, "01", &filename);
     if (!NIL_P(filename)) {
         BIO *bio = BIO_new_file(StringValueCStr(filename), "rb");
         if (!bio)
             ossl_raise(eConfigError, "BIO_new_file");
         config_load_bio(conf, bio); /* Consumes BIO */
     }
+    rb_obj_freeze(self);
     return self;
 }
 
@@ -453,6 +455,6 @@ Init_ossl_config(void)
      * The default system configuration file for OpenSSL.
      */
     path = CONF_get1_default_config_file();
-    path_str = ossl_buf2str(path, rb_long2int(strlen(path)));
+    path_str = rb_obj_freeze(ossl_buf2str(path, rb_long2int(strlen(path))));
     rb_define_const(cConfig, "DEFAULT_CONFIG_FILE", path_str);
 }

test/openssl/test_config.rb

@@ -273,6 +273,15 @@ def test_dup
     assert_equal(@it.sections.sort, c2.sections.sort)
   end
 
+  if respond_to?(:ractor)
+    ractor
+    def test_ractor
+      assert Ractor.shareable?(@it)
+      assert Ractor.shareable?(OpenSSL::Config.parse("[empty]\n"))
+      assert Ractor.shareable?(OpenSSL::Config::DEFAULT_CONFIG_FILE)
+    end
+  end
+
   private
 
   def in_tmpdir(*args)