晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //proc/thread-self/root/usr/share/doc/pam/txts/README.pam_chroot
This pam_chroot module provides session support only.  It is based
almost entirely on Matthew Kirkwood's original version obtained from
ftp://ferret.lmh.ox.ac.uk/users/weejock/pam_chroot/.

Operation:
When the calling application attempts to open a session, pam_chroot
opens /etc/security/chroot.conf and searches for a line of the form:
user directory
where the "user" listed is actually a regular expression.  If the
PAM_USER for whom the session is being opened matches the regular
expression, the module will attempt to chroot() to the given directory.

Optional arguments:
"debug"		Log debug messages to syslog.
"onerr="	Values can be "succeed" or "fail".  The action to take if
		the configuration file can not be opened, the chroot()
		fails, or the user does not match any of the expressions
		listed in the configuration file.  Default is "succeed".

Other Notes:
The calling application must be executing with root privileges in order to
be able to chroot() at all.  If the application needs to exec() other programs
(such as a server process or spawning a shell), you will need to duplicate
some portions of an actual root environment under the chroot()ed directory
in order for it to work at all.  (This includes configuration and logging
files.)  If configured incorrectly, this module may potentially render the
service unusable and, under some circumstances, pose a security risk.

In particular, the new root directory and all of its parent directories must
not be writable by anyone but root.

haha - 2025