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Singleton classes of unshareable objects are not shareable #15656
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This test forking while Ractors are running fails: 8bf333a |
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The test added in 8bf333a fails here as well. |
Currently, all RClasses are created as shareable in `class_alloc0`, which causes singleton classes of unshareable objects to be shareable which allows passing unshareable objects by passing their singleton class and getting their attached object. This changes `singleton_class_of` to mark the singleton class as shareable when the object is shareable, and inversely, to mark the singleton class as unshareable if the object is unshareable. We also need to not forcibly mark the class as shareable in `shareable_p_enter`. Additionally, if the object is not yet marked as shareable, but is frozen (and `allow_frozen_shareable_p`), it becomes marked as shareable through `rb_ractor_shareable_p`, and we need to also mark its singleton class as shareable at that point.
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❌ 11/66414 Tests Failedbootstraptest/test_insns.rb#bootstraptest/test_insns.rbbootstraptest/test_jump.rb#bootstraptest/test_jump.rb 🛡️ never-failing, but failed nowbootstraptest/test_literal_suffix.rb#bootstraptest/test_literal_suffix.rb 🛡️ never-failing, but failed nowbootstraptest/test_method.rb#bootstraptest/test_method.rb 🛡️ never-failing, but failed nowbootstraptest/test_ractor.rb#bootstraptest/test_ractor.rb6 more failed testsbootstraptest/test_struct.rb#bootstraptest/test_struct.rbbootstraptest/test_syntax.rb#bootstraptest/test_syntax.rb 🛡️ never-failing, but failed nowbootstraptest/test_thread.rb#bootstraptest/test_thread.rbbootstraptest/test_yjit.rb#bootstraptest/test_yjit.rb 🛡️ never-failing, but failed nowtest/fiber/test_scheduler.rb#test_iseq_compile_under_gc_stress_bug_21180 🛡️ never-failing, but failed nowtest/ruby/test_alias.rb#test_alias_wb_miss |
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Currently, all RClasses are created as shareable in
class_alloc0, which causes singleton classes of unshareable objects to be shareable which allows passing unshareable objects by passing their singleton class and getting their attached object.This changes
singleton_class_ofto mark the singleton class as shareable when the object is shareable, and inversely, to mark the singleton class as unshareable if the object is unshareable.We also need to not forcibly mark the class as shareable in
shareable_p_enter.Additionally, if the object is not yet marked as shareable, but is frozen (and
allow_frozen_shareable_p), it becomes marked as shareable throughrb_ractor_shareable_p, and we need to also mark its singleton class as shareable at that point.