Read perlsec
All command line arguments, environment variables, locale information (see perllocale), results of certain system calls (readdir(), readlink(), the variable of shmread(), the messages returned by msgrcv(), the password, gcos and shell fields returned by the getpwxxx() calls), and all file input are marked as "tainted".

In reply to Re: hard-to-understand taint error by Anonymous Monk
in thread hard-to-understand taint error by cmac

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