* string.c (rb_memhash): randomize hash to avoid algorithmic

  complexity attacks.
  (rb_str_hash): use rb_memhash.

* include/ruby/intern.h (rb_reset_random_seed): declared.

* thread.c (rb_thread_atfork): call rb_reset_random_seed.

* inits.c (rb_call_inits): call Init_RandomSeed at first.

* random.c (seed_initialized): defined.
  (fill_random_seed): extracted from random_seed.
  (make_seed_value): extracted from random_seed.
  (rb_f_rand): initialize random seed at first.
  (initial_seed): defined.
  (Init_RandomSeed): defined.
  (Init_RandomSeed2): defined.
  (rb_reset_random_seed): defined.
  (Init_Random): call Init_RandomSeed2.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@17465 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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