Search notes:

kernel parameters

Kernel parameters can be configured at run time with sysctl
Possible kernel parameters are those listed under /proc/sys or those listed in Documentation/admin-guide/kernel-parameters.rst
Use sysctl -a to display all currently available values.

kernel.yama.ptrace_scope

kernel.yama.ptrace_scope controls which processes can be traced with strace:

See also

Linux kernel command line
/proc/cmdline

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