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MFS jail: Change both root and working directories in jail_attach(2)

Description

MFS jail: Change both root and working directories in jail_attach(2)

jail_attach(2) performs an internal chroot operation, leaving it up to
the calling process to assure the working directory is inside the jail.

Add a matching internal chdir operation to the jail's root. Also
ignore kern.chroot_allow_open_directories, and always disallow the
operation if there are any directory descriptors open.

Reported by: mjg
Approved by: re (gjb), markj, kib

(cherry picked from commit d4380c0cdd0517dc038403dd5c99242ce78bdeb5)
(cherry picked from commit 5dbb407145c8128753fa30b695bc266dc671e433)

Details

Provenance
jamieAuthored on Feb 19 2021, 10:13 PM
Parents
rG5d07525b81af: pkg(7): address minor nits (mostly clang-analyze complaints)
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