✏ EDIT: 10-default-yama-scope.conf

# When yama is enabled in the kernel it might be used to filter any user
# space access which requires PTRACE_MODE_ATTACH like ptrace attach, access
# to /proc/PID/{mem,personality,stack,syscall}, and the syscalls
# process_vm_readv and process_vm_writev which are used for interprocess
# services, communication and introspection (like synchronisation, signaling,
# debugging, tracing and profiling) of processes.
#
# Usage of ptrace attach is restricted by normal user permissions. Normal
# unprivileged processes cannot interact through ptrace with processes
# that they cannot send signals to or processes that are running set-uid
# or set-gid.
#
# yama ptrace scope can be used to reduce these permissions even more.
# This should normally not be done because it will break various programs
# relying on the default ptrace security restrictions. But can be used
# if you don't have any other way to separate processes in their own
# domains. A different way to restrict ptrace is to set the selinux
# deny_ptrace boolean. Both mechanisms will break some programs relying
# on the ptrace system call and might force users to elevate their
# privileges to root to do their work.
#
# For more information see Documentation/security/Yama.txt in the kernel
# sources. Which also describes the defaults when CONFIG_SECURITY_YAMA
# is enabled in a kernel build (currently 1 for ptrace_scope).
#
# This runtime kernel parameter can be set to the following options:
# (Note that setting this to anything except zero will break programs!)
#
# 0 - Default attach security permissions.
# 1 - Restricted attach. 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.
#
kernel.yama.ptrace_scope = 0

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