[issue1863] Implement 'hammer volume-list' subcommand

[Stathis Kamperis (via DragonFly issue tracker)]

Stathis Kamperis <ekamperi at gmail.com> added the comment:

Fixed, sorry.

I changed strlcpy() to copyout() and also added some rudimentary validation on
the count of volumes to write.

I honestly don't know how to make kernel defend against a lying user-land.

Regards,
Stathis

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