$ ldd /usr/lib64/apache2/mod_perl.so 
        linux-vdso.so.1 =>  (0x00007fffb37ff000)
        libperl.so => /usr/lib/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so (0x00007fc9cd343000)
        libm.so.6 => /lib64/libm.so.6 (0x00007fc9cd0ba000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007fc9cceb6000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007fc9ccc79000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc9cca5c000)
        libc.so.6 => /lib64/libc.so.6 (0x00007fc9cc703000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fc9cd93f000)

##</code><code>##

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

##</code><code>##

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