nspawn: set read-only access mode on two /run/host/ files

The diectory is mounted read-only anyway, hence this doesn't do much,
but let's lock this down on every level we can.

diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index 9e53c51f1ac2e295b3ee17ef14fdc08e7c54b974..3ace3520b9c126fab90ba6de9e177cb985701989 100644 (file)
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -3946,11 +3946,11 @@ static int outer_child(
 
         /* The same stuff as the $container env var, but nicely readable for the entire payload */
         p = prefix_roota(directory, "/run/host/container-manager");
-        (void) write_string_file(p, arg_container_service_name, WRITE_STRING_FILE_CREATE);
+        (void) write_string_file(p, arg_container_service_name, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_MODE_0444);
 
         /* The same stuff as the $container_uuid env var */
         p = prefix_roota(directory, "/run/host/container-uuid");
-        (void) write_string_filef(p, WRITE_STRING_FILE_CREATE, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(arg_uuid));
+        (void) write_string_filef(p, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_MODE_0444, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(arg_uuid));
 
         if (!arg_use_cgns) {
                 r = mount_cgroups(