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[DOC] Deleted the description about 2.2 and earlier

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Nobuyoshi Nakada 2025-07-03 15:46:57 +09:00
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doc/security.rdoc
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@ -53,9 +53,8 @@ method, variable and constant names. The reason for this is that symbols are
simply integers with names attached to them, so they are faster to look up in
hashtables.
Starting in version 2.2, most symbols can be garbage collected; these are
called _mortal_ symbols. Most symbols you create (e.g. by calling
+to_sym+) are mortal.
Most symbols can be garbage collected; these are called _mortal_
symbols. Most symbols you create (e.g. by calling +to_sym+) are mortal.
_Immortal_ symbols on the other hand will never be garbage collected.
They are created when modifying code:
@ -64,8 +63,6 @@ They are created when modifying code:
* creating a variable or constant (e.g. with +const_set+)
C extensions that have not been updated and are still calling +SYM2ID+
will create immortal symbols.
Bugs in 2.2.0: +send+ and +__send__+ also created immortal symbols,
and calling methods with keyword arguments could also create some.
Don't create immortal symbols from user inputs. Otherwise, this would
allow a user to mount a denial of service attack against your application by