Bug #4338: random number generator not reseeded after fork in 1.8

• Status: Closed
• Assignee: shyouhei (Shyouhei Urabe)
• Target version: Ruby 1.8.7
• ruby -v: ruby 1.8.7 (2010-12-23 patchlevel 330) [x86_64-linux]

[normalperson (Eric Wong)]

=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

[normalperson (Eric Wong)]

=begin
Eric Wong [e-mail] wrote:

Bug #4338: random number generator not reseeded after fork in 1.8
http://redmine.ruby-lang.org/issues/show/4338

Author: Eric Wong
Status: Open, Priority: Normal
Category: core, Target version: Ruby 1.8.7
ruby -v: ruby 1.8.7 (2010-12-23 patchlevel 330) [x86_64-linux]

I should also add that this was not an issue in Ruby 1.8.6-p114, but
it is in 1.8.6-p399. So a regression slipped in somewhere along the
way.

--
Eric Wong
=end

[normalperson (Eric Wong)]

=begin
Eric Wong [e-mail] wrote:

Bug #4338: random number generator not reseeded after fork in 1.8
http://redmine.ruby-lang.org/issues/show/4338

Author: Eric Wong
Status: Open, Priority: Normal
Category: core, Target version: Ruby 1.8.7
ruby -v: ruby 1.8.7 (2010-12-23 patchlevel 330) [x86_64-linux]

I should also add that this was not an issue in Ruby 1.8.6-p114, but
it is in 1.8.6-p399. So a regression slipped in somewhere along the
way.

--
Eric Wong

=end

[normalperson (Eric Wong)]

=begin
Hello? Can somebody please look into this? Thanks.
=end

[shyouhei (Shyouhei Urabe)]

• Status changed from Open to Assigned
• Assignee set to shyouhei (Shyouhei Urabe)

=begin
OK, now I consider this is a bug. To be fixed on the next patchlevel. Stay tuned.
=end

[shyouhei (Shyouhei Urabe)]

• Status changed from Assigned to Closed

I think I have fixed this.