String#ljust taint bug
----------------------
Key: JRUBY-5271
URL: http://jira.codehaus.org/browse/JRUBY-5271
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.5.6
Environment: ubuntu 10
jruby 1.5.6 (ruby 1.8.7 patchlevel 249) (2010-12-03 9cf97c3) (OpenJDK Client VM
1.6.0_20) [i386-java]
Reporter: Daniel Berger
Priority: Minor
Obscure taint rule for String#ljust: even if the 2nd argument is tainted, the
result is tainted if and only if the resulting string length is greater than
the receiver's length.
With MRI (ruby 1.8.7-p302):
{code}
irb(main):001:0> 'hello'.ljust(4, 'X'.taint).tainted?
=> false
irb(main):002:0> 'hello'.ljust(5, 'X'.taint).tainted?
=> false
irb(main):003:0> 'hello'.ljust(6, 'X'.taint).tainted?
=> true
{code}
With JRuby 1.5.6:
{code}
irb(main):001:0> 'hello'.ljust(4, 'X'.taint).tainted?
=> true
irb(main):002:0> 'hello'.ljust(5, 'X'.taint).tainted?
=> true
irb(main):003:0> 'hello'.ljust(6, 'X'.taint).tainted?
=> true
{code}
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