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Bug #4338

closed

random number generator not reseeded after fork in 1.8

Added by normalperson (Eric Wong) almost 11 years ago. Updated over 10 years ago.

Status:
Closed
Priority:
Normal
Target version:
ruby -v:
ruby 1.8.7 (2010-12-23 patchlevel 330) [x86_64-linux]
[ruby-core:34944]

Description

=begin
rand should return different values in forked processes like in 1.9.2. This
may have security implications for some programs.

Remembering to call srand after forking will fix the issue, but remembering is
hard especially since 1.9.2 makes it easy :)

The following example prints out 3 identical lines in 1.8.7:

fork { $stdout.syswrite("#{rand}\n") }
fork { $stdout.syswrite("#{rand}\n") }
$stdout.syswrite("#{rand}\n")
Process.waitall
=end

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