Forum: Ruby $SAFE variable in Ruby.

The variable $SAFE determines Ruby's level of paranoia. Now it has 5
different values to protest against "Security Vulnerabilities". Now Can
any present some real time scenarios by which it can be easily
understandable how the $SAFE defined values performing for which they
are set or when should we set what value out of 5?



Now also in what situation we should think of lowering the SAFE level
values or increasing the same?


Thanks

On Fri, Jan 11, 2013 at 4:31 PM, Arup Rakshit <lists@ruby-forum.com> 
wrote:
> The variable $SAFE determines Ruby's level of paranoia. Now it has 5
> different values to protest against "Security Vulnerabilities". Now Can
> any present some real time scenarios by which it can be easily

Do you mean "real world" scenarios?

> understandable how the $SAFE defined values performing for which they
> are set or when should we set what value out of 5?

A bit dated but probably still mostly correct
http://www.ruby-doc.org/docs/ProgrammingRuby/html/taint.html

> Now also in what situation we should think of lowering the SAFE level
> values or increasing the same?

You cannot lower it - for security reasons.  Typically you will create
a separate thread increase $SAFE there and do the potentially harmful
operations that you want to guard.

Kind regards

rpbert

Robert Klemme wrote in post #1091954:
> On Fri, Jan 11, 2013 at 4:31 PM, Arup Rakshit <lists@ruby-forum.com>
> wrote:
>> The variable $SAFE determines Ruby's level of paranoia. Now it has 5
>> different values to protest against "Security Vulnerabilities". Now Can
>> any present some real time scenarios by which it can be easily
>
> Do you mean "real world" scenarios?

Yes i was looking for "real world" scenarios,so that i can get the core 
value of this topic in my nerve.

Really interested to know about this one. When we need to think of such 
concept,how to use and if not used what can be happened and when used 
how the risk can be optimized/removed - that's all my i am eager to 
know.


Thanks,

Can anyone help me in my post here?