Issue #9588 has been updated by jeremyevans0 (Jeremy Evans).

Status changed from Open to Closed

As tainting will be removed from Ruby 2.7, this can be closed.

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Bug #9588: program name variables tainted
https://bugs.ruby-lang.org/issues/9588#change-82010

* Author: jrusnack (Jan Rusnacko)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 1.8.7, 1.9.3, 2.0.0
* Backport: 
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I have noticed inconsistency in taint flag of program name:

```
[jrusnack@dhcp-31-42 ruby-safe]$ cat tainted.rb
#!/usr/bin/env ruby
puts "$0:            #{$0}, tainted? #{$0.tainted?}"
puts "__FILE__:      #{__FILE__}, tainted? #{__FILE__.tainted?}"
puts "$PROGRAM_NAME: #{$PROGRAM_NAME}, tainted? #{$PROGRAM_NAME.tainted?}"

[jrusnack@dhcp-31-42 ruby-safe]$ rvm use 1.8.7
Using /home/jrusnack/.rvm/gems/ruby-1.8.7-p374

[jrusnack@dhcp-31-42 ruby-safe]$ ./tainted.rb
$0:            ./tainted.rb, tainted? true
__FILE__:      ./tainted.rb, tainted? false
$PROGRAM_NAME: ./tainted.rb, tainted? true

[jrusnack@dhcp-31-42 ruby-safe]$ rvm use 1.9.3
Using /home/jrusnack/.rvm/gems/ruby-1.9.3-p484

[jrusnack@dhcp-31-42 ruby-safe]$ ./tainted.rb
$0:            ./tainted.rb, tainted? false
__FILE__:      ./tainted.rb, tainted? true
$PROGRAM_NAME: ./tainted.rb, tainted? false

[jrusnack@dhcp-31-42 ruby-safe]$ rvm use 2.0.0
Using /home/jrusnack/.rvm/gems/ruby-2.0.0-p353

[jrusnack@dhcp-31-42 ruby-safe]$ ./tainted.rb
$0:            ./tainted.rb, tainted? false
__FILE__:      ./tainted.rb, tainted? true
$PROGRAM_NAME: ./tainted.rb, tainted? false
```



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