From f2300a5c3226d3a66d77c34ae811401c638f430f Mon Sep 17 00:00:00 2001
From: Ronny Chevalier <chevalier.ronny@gmail.com>
Date: Mon, 21 Sep 2015 15:45:51 +0200
Subject: [PATCH] core: fix group ownership when Group is set

When Group is set in the unit, the runtime directories are owned by
this group and not the default group of the user (same for cgroup paths
and standard outputs)

Fix #1231

Cherry-picked from: 5bc7452b3219456e07f931e40da30bb94a884293
Resolves: #1324826
---
 src/core/execute.c                       | 19 +++++++++++--------
 src/test/test-execute.c                  |  1 +
 test/exec-runtimedirectory-owner.service |  9 +++++++++
 3 files changed, 21 insertions(+), 8 deletions(-)
 create mode 100644 test/exec-runtimedirectory-owner.service

diff --git a/src/core/execute.c b/src/core/execute.c
index 1815e3d..8172c8b 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -629,14 +629,6 @@ static int enforce_groups(const ExecContext *context, const char *username, gid_
          * we avoid NSS lookups for gid=0. */
 
         if (context->group || username) {
-
-                if (context->group) {
-                        const char *g = context->group;
-
-                        if ((r = get_group_creds(&g, &gid)) < 0)
-                                return r;
-                }
-
                 /* First step, initialize groups from /etc/groups */
                 if (username && gid != 0) {
                         if (initgroups(username, gid) < 0)
@@ -1374,6 +1366,17 @@ static int exec_child(
                 }
         }
 
+        if (context->group) {
+                const char *g = context->group;
+
+                r = get_group_creds(&g, &gid);
+                if (r < 0) {
+                        *exit_status = EXIT_GROUP;
+                        return r;
+                }
+        }
+
+
         /* If a socket is connected to STDIN/STDOUT/STDERR, we
          * must sure to drop O_NONBLOCK */
         if (socket_fd >= 0)
diff --git a/src/test/test-execute.c b/src/test/test-execute.c
index 90b1c87..38522a1 100644
--- a/src/test/test-execute.c
+++ b/src/test/test-execute.c
@@ -144,6 +144,7 @@ static void test_exec_umask(Manager *m) {
 static void test_exec_runtimedirectory(Manager *m) {
         test(m, "exec-runtimedirectory.service", 0, CLD_EXITED);
         test(m, "exec-runtimedirectory-mode.service", 0, CLD_EXITED);
+        test(m, "exec-runtimedirectory-owner.service", 0, CLD_EXITED);
 }
 
 int main(int argc, char *argv[]) {
diff --git a/test/exec-runtimedirectory-owner.service b/test/exec-runtimedirectory-owner.service
new file mode 100644
index 0000000..077e08d
--- /dev/null
+++ b/test/exec-runtimedirectory-owner.service
@@ -0,0 +1,9 @@
+[Unit]
+Description=Test for RuntimeDirectory owner (must not be the default group of the user if Group is set)
+
+[Service]
+ExecStart=/bin/sh -c 'f=/tmp/test-exec_runtimedirectory-owner;g=$(stat -c %G $f); echo "$g"; exit $(test $g = "nobody")'
+Type=oneshot
+Group=nobody
+User=root
+RuntimeDirectory=test-exec_runtimedirectory-owner