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/lib/python3.6/site-packages/sepolicy/help/lockdown_ptrace.txt
Disable ptrace capability on your system.


The deny_ptrace feature allows an administrator to toggle the ability of processes on the computer system from examining other processes on the system, including user processes.   It can even block processes running as root.

Most people do not realize that any program they run can examine the memory of any other process run by them.  Meaning the computer game you are running on your desktop can watch everything going on in Firefox or a programs like pwsafe or kinit or other program that attempts to hide passwords..

SELinux defines this access as ptrace and sys_ptrace.  These accesses allow one process to read the memory of another process.   ptrace allows developers and administrators to debug how a process is running using tools like strace, ptrace and gdb.    You can even use gdb (GNU Debugger to manipulate another process running memory and environment.

The problem is this is allowed by default.

My wife does not debug programs, why is she allowed to debug them?  As a matter of fact most of the time, I am not debugging applications, so it would be more secure if we could disable it by default.

Note: Disabling ptrace can break some bug trappers that attempt to collect crash data.

haha - 2025