From f58c5ced373c2532b5cc44ba2e0c3a28b41472f2 Mon Sep 17 00:00:00 2001
From: Jan Synacek <jsynacek@redhat.com>
Date: Tue, 15 May 2018 09:24:20 +0200
Subject: [PATCH] Avoid /tmp being mounted as tmpfs without the user's will

Ensure PrivateTmp doesn't require tmpfs through tmp.mount, but rather
adds an After relationship.

rhel-only

Resolves: #1578772
---
 src/core/unit.c    | 12 ++++++------
 units/basic.target |  3 ++-
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/core/unit.c b/src/core/unit.c
index 113205bf2..c9f756c9c 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -982,13 +982,13 @@ int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
                 return 0;
 
         if (c->private_tmp) {
-                const char *p;
+                r = unit_add_dependency_by_name(u, UNIT_AFTER, "tmp.mount", NULL, true, UNIT_DEPENDENCY_FILE);
+                if (r < 0)
+                        return r;
 
-                FOREACH_STRING(p, "/tmp", "/var/tmp") {
-                        r = unit_require_mounts_for(u, p, UNIT_DEPENDENCY_FILE);
-                        if (r < 0)
-                                return r;
-                }
+                r = unit_require_mounts_for(u, "/var/tmp", UNIT_DEPENDENCY_FILE);
+                if (r < 0)
+                        return r;
 
                 r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_TMPFILES_SETUP_SERVICE, NULL, true, UNIT_DEPENDENCY_FILE);
                 if (r < 0)
diff --git a/units/basic.target b/units/basic.target
index 4f4429224..8fc7c73ef 100644
--- a/units/basic.target
+++ b/units/basic.target
@@ -19,4 +19,5 @@ After=sysinit.target sockets.target paths.target slices.target tmp.mount
 # require /var and /var/tmp, but only add a Wants= type dependency on /tmp, as
 # we support that unit being masked, and this should not be considered an error.
 RequiresMountsFor=/var /var/tmp
-Wants=tmp.mount
+# RHEL-only: Disable /tmp on tmpfs.
+#Wants=tmp.mount