lib/shell/command-processor.rb (Shell#[]): prevent unknown command

`FileTest.send(command, ...)` allows to call not only FileTest-related
methods but also any method that belongs to Kernel, Object, etc.
patched by <mame@ruby-lang.org>


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@67820 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/shell/command-processor.rb

@@ -180,6 +180,9 @@ class Shell
             top_level_test(command, file1)
           end
         else
+          unless FileTest.methods(false).include?(command.to_sym)
+            raise "unsupported command: #{ command }"
+          end
           if file2
             FileTest.send(command, file1, file2)
           else

test/shell/test_command_processor.rb

@@ -66,4 +66,22 @@ class TestShell::CommandProcessor < Test::Unit::TestCase
     Process.waitall
     Dir.rmdir(path)
   end
+
+  def test_test
+    name = "foo#{exeext}"
+    path = File.join(@tmpdir, name)
+    open(path, "w", 0644) {}
+
+    assert_equal(true, @shell[?e, path])
+    assert_equal(true, @shell[:e, path])
+    assert_equal(true, @shell["e", path])
+    assert_equal(true, @shell[:exist?, path])
+    assert_equal(true, @shell["exist?", path])
+    assert_raise_with_message(RuntimeError, /unsupported command/) do
+      assert_equal(true, @shell[:instance_eval, path])
+    end
+  ensure
+    Process.waitall
+    File.unlink(path)
+  end
 end

version.h

@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.4.8"
 #define RUBY_RELEASE_DATE "2019-10-01"
-#define RUBY_PATCHLEVEL 360
+#define RUBY_PATCHLEVEL 361
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 10