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$ ldd /usr/lib64/apache2/mod_perl.so 
        linux-vdso.so.1 =>  (0x00007fffb37ff000)
...
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc9cca5c000)
        libc.so.6 => /lib64/libc.so.6 (0x00007fc9cc703000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fc9cd93f000)

$ nm -D /usr/lib/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.s
+o | grep PL_tainting

$ nm -D /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi/a
+uto/DBI/DBI.so | grep PL_tainting
                 U PL_tainting