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<h1 id="ptrace_scope"><a class="header" href="#ptrace_scope">ptrace_scope</a></h1>
<p>In case the kernel was compiled with the <code>yama</code> security module
(<code>CONFIG_SECURITY_YAMA</code>), tracing processes with <code>ptrace(2)</code> can be restricted.</p>
<pre><code class="language-config">/proc/sys/kernel/yama/ptrace_scope
0 => No restrictions.
1 => Restricted attach, only the following can attach
- A process in the parent hierarchy.
- A process with CAP_SYS_PTRACE.
- A process with the PID that the tracee allowed by via
PR_SET_PTRACER.
2 => Only processes with CAP_SYS_PTRACE in the user namespace of the tracee
can attach.
3 => No tracing allowed.
</code></pre>
<p>Further details in <a href="https://man7.org/linux/man-pages/man2/ptrace.2.html"><code>ptrace(2)</code></a>.</p>
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