From: nobu@...
Date: 2015-12-17T02:57:44+00:00
Subject: [ruby-core:72202] [Ruby trunk - Bug #11740] ObjectSpace.each_object exposes internal metaclasses

Issue #11740 has been updated by Nobuyoshi Nakada.


Koichi Sasada wrote:
> ```diff
> +int
> +rb_singleton_class_has_metaclass_p(VALUE sklass)
> +{
> +    return rb_ivar_get(METACLASS_OF(sklass), id_attached) == sklass;
> +}

Should be `rb_attr_get` instead.

Benoit Daloze wrote:
> PS: How should I apply the patch? I tried `patch < x.patch` but I got a rejected hunk in gc.c

Redmine seems expand tabs, you can see markdown source from a pencil icon.


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Bug #11740: ObjectSpace.each_object exposes internal metaclasses
https://bugs.ruby-lang.org/issues/11740#change-55613

* Author: Benoit Daloze
* Status: Open
* Priority: Normal
* Assignee: Koichi Sasada
* ruby -v: ruby 2.3.0dev (2015-11-19 trunk 52672) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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ObjectSpace.each_object exposes internal metaclasses and
this might result in assumptions being violated since the metaclass structure is not well preserved.

See the attached script for an example.
The #bla method should always be defined on the metaclass of "klass".

See https://bugs.ruby-lang.org/issues/11360#note-2 as well in which I warned against this problem ;)

---Files--------------------------------
objspace_expose_intern_meta.rb (413 Bytes)


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