security - Howto for simple pipe without shell escape in perl? -

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my perl cgi program needs pass arbitrary latex math expression, provided anonymous untrusted malicious web user, (trusted) phantomjs script runs mathjax obtain svg. think want do

use perl6::slurp; $svg= slurp( $fname, "mathjax-script.js '$not_trusted_expr' |");

in many scripts had written in past, sanitize $not_trusted_expr containing characters approved list, latex expressive make feasible approach. user can provide $not_trusted_expr can contain literally anything---incl \' itself---and reasons.

so, need absolutely there no ways shell escape characters interpreted along way in travel of characters mathjax-script.js .

do read slurp doc correctly in believing that

my $svg=slurp( "-|", "mathjax-script.js", $not_trusted_expr );

is complete solution problem, because means shell never invoked?

/iaw

yes, perl6::slurp::slurp wraps builtin open function, , ... -|, $cmd, @args syntax pass arguments directly system execvp function (on unixy systems, perl6::slurp doc allude to).


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