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Perl interpolates variables in double quoted strings safely. Everything in the variable is considered to be a literal. So
my $a = q#${system('rm -rf /')}#; print "The command in \$a is $a\n";
will print out:
The command in $a is ${system('rm -rf /')}
and not even attempt to remove my files. Likewise this
my $b = "The command in \$a is $a\n";
sets $b to the string we printed out. Printing $b does exactly the same as the above. The only way this is going to come and cause us grief is if we eval $a - as you've suggested.

Perhaps the author is mistaken or you've misunderstood the reference, can you post the paragraph or two? I've checked the book errata and it's not mentioned anywhere there, but it's a pretty big mistake if you haven't misunderstood it.

Even authors make mistakes. :)


In reply to Re: Trojan Horse? (taint mode) by jarich
in thread Trojan Horse? (taint mode) by IraTarball

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