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2021-04-06T19:22:58.974525Z
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mount: Disallow mounting over a jail root

Discussed with:	jamie
Approved by:	so
Security:	CVE-2020-25584
Security:	FreeBSD-SA-21:10.jail_mount

(cherry picked from commit 6f7815083ad66c34bad0dfa08c7033ff670b3be1)

Git Hash:   e59bfcaa37fc8fe5c6e200e53aa6daa841751cb7
Git Author: markj@FreeBSD.org
END