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 : //usr/share/doc/systemd/20-yama-ptrace.conf
# The ptrace system call is used for interprocess services,
# communication and introspection (like synchronisation, signaling,
# debugging, tracing and profiling) of processes.
#
# Usage of ptrace is restricted by normal user permissions. Normal
# unprivileged processes cannot use ptrace on processes that they
# cannot send signals to or processes that are running set-uid or
# set-gid. Nevertheless, processes running under the same uid will
# usually be able to ptrace one another.
#
# Fedora enables the Yama security mechanism which restricts ptrace
# even further. Sysctl setting kernel.yama.ptrace_scope can have one
# of the following values:
#
# 0 - Normal ptrace security permissions.
# 1 - Restricted ptrace. Only child processes plus normal permissions.
# 2 - Admin-only attach. Only executables with CAP_SYS_PTRACE.
# 3 - No attach. No process may call ptrace at all. Irrevocable.
#
# For more information see Documentation/security/Yama.txt in the
# kernel sources.
#
# The default is 1., which allows tracing of child processes, but
# forbids tracing of arbitrary processes. This allows programs like
# gdb or strace to work when the most common way of having the
# debugger start the debuggee is used:
#    gdb /path/to/program ...
# Attaching to already running programs is NOT allowed:
#    gdb -p ...
# This default setting is suitable for the common case, because it
# reduces the risk that one hacked process can be used to attack other
# processes. (For example, a hacked firefox process in a user session
# will not be able to ptrace the keyring process and extract passwords
# stored only in memory.)
#
# Developers and administrators might want to disable those protections
# to be able to attach debuggers to existing processes. Use
#   sysctl kernel.yama.ptrace_scope=0
# for change the setting temporarily, or copy this file to
# /etc/sysctl.d/20-yama-ptrace.conf to set it for future boots.

kernel.yama.ptrace_scope = 0

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