From 5a65aa9b9d4035f94cee1016a256cec017a42aad Mon Sep 17 00:00:00 2001
From: Peter Robinson <pbrobinson@gmail.com>
Date: Fri, 20 Sep 2019 14:55:28 +0100
Subject: [PATCH 3/4] systemd: Add more filesystem lockdown

We can only access the configuration file as read-only and read-write
to the Bluetooth cache directory and sub-directories.
---
 Makefile.am              | 2 ++
 src/bluetooth.service.in | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index 033faf3bf..f6347a14b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -563,6 +563,8 @@ MAINTAINERCLEANFILES = Makefile.in \
 
 SED_PROCESS = $(AM_V_GEN)$(MKDIR_P) $(dir $@) && \
 		$(SED) -e 's,@pkglibexecdir\@,$(pkglibexecdir),g' \
+		-e 's,@statedir\@,$(statedir),g' \
+		-e 's,@confdir\@,$(confdir),g' \
 		< $< > $@
 
 %.service: %.service.in Makefile
diff --git a/src/bluetooth.service.in b/src/bluetooth.service.in
index 7c2f60bb4..4daedef2a 100644
--- a/src/bluetooth.service.in
+++ b/src/bluetooth.service.in
@@ -17,6 +17,10 @@ LimitNPROC=1
 ProtectHome=true
 ProtectSystem=full
 PrivateTmp=true
+ProtectKernelTunables=true
+ProtectControlGroups=true
+ReadWritePaths=@statedir@
+ReadOnlyPaths=@confdir@
 
 # Privilege escalation
 NoNewPrivileges=true
-- 
2.21.0