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-rw-r--r--src/core/service.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/core/service.c b/src/core/service.c
index 5bc8df3e1c..74054887b9 100644
--- a/src/core/service.c
+++ b/src/core/service.c
@@ -3093,6 +3093,8 @@ static void service_notify_message(Unit *u, pid_t pid, char **tags, FDSet *fds)
log_unit_warning(u, "Failed to parse MAINPID= field in notification message: %s", e);
else if (pid == s->control_pid)
log_unit_warning(u, "A control process cannot also be the main process");
+ else if (pid == getpid() || pid == 1)
+ log_unit_warning(u, "Service manager can't be main process, ignoring sd_notify() MAINPID= field");
else {
service_set_main_pid(s, pid);
unit_watch_pid(UNIT(s), pid);