Kyle Evans
b2a270da9f
When doing a basic `jls -n`, jls(8) will jailparam_get() the mac.label for every jail on the system using the same set of jailparams, and thus the same jp_value. We only init the mac_t the first time, so the first jail would populate it with `?` from /etc/mac.conf and the resulting jail_get(2) would clobber it with the empty string, then a second jail would try to pass the empty string to the kernel and fail because it must have a non-zero length. Fix it by invoking jps_get() every time. Drop some comments to note that jps_get() will be invoked with zero || garbage from previous call, and be sure that we don't leak our previous mac_t. There aren't any other jps_get implementations at this time, so this shouldn't cause any unexpected problems. Reported by: ivy Reviewed by: jamie Differential Revision: https://reviews.freebsd.org/D57280
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