[Bug 287615] Minor fix to quoting in jail.c

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287615

Jim Long <freebsd-bugzilla@umpquanet.com> changed:

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--- Comment #2 from Jim Long <freebsd-bugzilla@umpquanet.com> ---
Created attachment 261437
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=261437&action=edit
Extend "jail -e" quoting protection to: | ` < > &

This is still sub-optimal, but making this 100% correct is somewhat fraught, as
it depends at least in part on which shell or scripting language the escaping
is intended to protect against.

I've altered my patch to include a few more of the most common meta-characters.

Thanks again for your attention to this issue.

Jim

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