units: add nosuid and nodev options to tmp.mount (#3575)

This makes privilege escalation attacks harder by putting traps and exploits
into /tmp.

https://bugs.debian.org/826377

diff --git a/units/tmp.mount.m4 b/units/tmp.mount.m4
index 1448bd268a0bb0d5b8c130eb53900118dc836e76..0baecfd22f83120f7b281639306bb46393345e6e 100644 (file)
--- a/units/tmp.mount.m4
+++ b/units/tmp.mount.m4
@@ -19,4 +19,4 @@ After=swap.target
 What=tmpfs
 Where=/tmp
 Type=tmpfs
-Options=mode=1777,strictatime
+Options=mode=1777,strictatime,nosuid,nodev