bugGNU Octave - Bugs: bug #45398, system without shell


bug #45398: system without shell

Submitter:  CarnĂ« Draug <carandraug>
Submitted:  Wed 24 Jun 2015 07:41:08 PM UTC
Category:  Octave Function Severity:  1 - Wish
Priority:  5 - Normal Item Group:  Feature Request
Status:  None Assigned to:  None
Originator Name:  Open/Closed:  * Open
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Wed 24 Jun 2015 07:41:08 PM UTC, original submission:  

Other than fork and exec, it is not possible to make a system while avoiding the shell. Would be nice to have this, similar to perl's system:

@args = ("command", "arg1", "arg2");
system (@args);

and python's subprocess:

subprocess.call (["command", "arg1", "arg2"]);

The reason to avoid the shell is security. From python's own documentation

>>> from subprocess import call
>>> filename = input("What file would you like to display?\n")
What file would you like to display?
non_existent; rm -rf / #
>>> call("cat " + filename, shell=True) # Uh-oh. This will end badly...

We already have a bunch of extra options for system() so I'm proposing to implement something like perl, and skip the shell if the first argument is a cell array of strings. Does that sound good?

Carnë Draug <carandraug>
Project Member


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