What are some of the characteristics of Perl's taint mode?
What will be an ideal response?
The following is a list of taint mode characteristics:
* Perl will verify that path directories are not writable by others.
* A tainted Perl program cannot use data derived from outside of the program to affect something else outside the program.
* All command line arguments, file input, environment variables, locale information, results of sensitive system calls-such as readdir(), readlink(), the variable of shmread(), the messages returned by msgrcv(), the password, gcos, and shell fields returned by the getpwxxx() calls-are marked as "tainted" when Perl is in taint mode.
* Tainted data cannot be used directly or indirectly in any command that invokes a subshell or in any command that will modify files, directories, or processes.
* If a Perl expression contains tainted data, any subexpression is considered tainted, even if the value of the subexpression is not itself affected by the tainted data. In other words, one tainted value taints the whole expression.
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