sysctl: add 50-default.conf

Makefile.am

@@ -330,6 +330,9 @@ dist_tmpfiles_DATA = \
 	tmpfiles.d/tmp.conf \
 	tmpfiles.d/x11.conf
 
+dist_sysctl_DATA = \
+	sysctl.d/50-default.conf
+
 if HAVE_SYSV_COMPAT
 dist_tmpfiles_DATA += \
 	tmpfiles.d/legacy.conf

sysctl.d/.gitignore

@@ -1 +1 @@
-/coredump.conf
+/50-coredump.conf

sysctl.d/50-default.conf

@@ -0,0 +1,21 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+# See sysctl.d(5) and core(5) for for details.
+
+# Append the PID to the core filename
+kernel.core_uses_pid = 1
+
+# Source route verification
+net.ipv4.conf.default.rp_filter = 1
+
+# Do not accept source routing
+net.ipv4.conf.default.accept_source_route = 0
+
+# Enable hard and soft link protection
+fs.protected_hardlinks = 1
+fs.protected_symlinks = 1