It shouldn't be taint; taint is checked for system calls, but not for simple operations like modulus.
It does work okay here (RHEL 3, perl 5.8.0).
When I run it as follows:
use strict;
use warnings;
use RRDs;
my $datafile = "temp.rrd";
my $lupdate = 12345;
my $hash = RRDs::info($datafile);
my $step = $hash->{'step'};
my $mid = $lupdate % $step;
print $mid;
... it prints 45 as expected.
Possibly the error is elsewhere in your code...?
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