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allowing Data::Dumper within

by gideondsouza (Pilgrim)
on Feb 12, 2013 at 08:25 UTC ( #1018315=perlquestion: print w/replies, xml ) Need Help??
gideondsouza has asked for the wisdom of the Perl Monks concerning the following question:

So I use, to allow and deny certain operations. When I use Data::Dumper I get:
Unsafe code detected: 'eval "string"' trapped by operation mask at /usr/.../ line 160 +. Compilation failed in require at /usr/../Data/ line 22. BEGIN failed--compilation aborted at /usr/../Data/ line 22.
This is what my Safe permit/denies look like:
$compartment->deny(qw(:base_io :ownprocess :subprocess :filesys_read : +sys_db :filesys_open :filesys_write :dangerous)); $compartment->permit(qw(print say pack unpack require caller));

Question: What should I allow to make Data::Dumper work? I tried permit("eval") but it says no operator recognized

Note, this is NOT production code, this is a learning project I'm working on.

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Re: allowing Data::Dumper within
by Anonymous Monk on Feb 12, 2013 at 09:17 UTC

      Ah! I've tried entereval and leaveeval and it still gives me the exact same message! :(

      How should I use share_from, I don't quite understand what it does!

        share() allows you to specify which global variables in your program that you want your compartment to be able to see. However, you can only specify simple names, like '$x', i.e. names from the current namespace.

        share_from() allows you to specify more complex variable names, i.e. variables from a different namespace, e.g. package X::Y::Z.

        However, I've not succeeded in getting either to work. If you do, please post an example.

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Node Type: perlquestion [id://1018315]
Approved by kcott
Front-paged by Corion
[Corion]: Maybe doing a double-fork (daemonizing) can make go that information away, but maybe not
[Corion]: But I think my knowledge of unix/Linux datastructures is several decades out of date, so I don't really know what information it keeps on processes
[oiskuu]: The useful bits that relate to your process can be found under /proc/self. What information are you thinking of? Tty name?
[tye]: I just daemonized and getlogin() still knew who I had been.
[tye]: perhaps loginuid ? Not that I concede that something not being in /proc means it is not useful.
[Corion]: tye: That's really interesting, but maybe it is because getlogin() returns the name, or the uid, so if that user has been replaced by another user with the same uid in the meantime, that's no problem to the system...
[davido]: or on ubuntu /var/run/utmp

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