Change permissions of logs from 0600 to 0640

Changing log permissions to 0640 would allow the administrator to
set sticky group on the log directory, and for a selected
log-users (in a specific group) without root-permissions to
read the log files.

Fixes #539

Signed-off-by: Jindrich Novy <jnovy@redhat.com>

src/ctr_logging.c

@@ -113,7 +113,7 @@ void configure_log_drivers(gchar **log_drivers, int64_t log_size_max_, int64_t l
 	}
 	if (use_k8s_logging) {
 		/* Open the log path file. */
-		k8s_log_fd = open(k8s_log_path, O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC, 0600);
+		k8s_log_fd = open(k8s_log_path, O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC, 0640);
 		if (k8s_log_fd < 0)
 			pexit("Failed to open log file");
 
@@ -613,7 +613,7 @@ static void reopen_k8s_file(void)
 	k8s_bytes_written = 0;
 
 	/* Open the log path file again */
-	k8s_log_fd = open(k8s_log_path_tmp, O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, 0600);
+	k8s_log_fd = open(k8s_log_path_tmp, O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, 0640);
 	if (k8s_log_fd < 0)
 		pexitf("Failed to open log file %s", k8s_log_path);