let join wait if target sandbox is not ready yet

fixes #2139

1 files changed, 2 insertions, 15 deletions

diff --git a/src/firejail/protocol.c b/src/firejail/protocol.c
index 72d29c671..d3a9e0153 100644
--- a/src/firejail/protocol.c
+++ b/src/firejail/protocol.c
@@ -67,21 +67,8 @@ void protocol_print_filter(pid_t pid) {
         // in case the pid is that of a firejail process, use the pid of the first child process
         pid = switch_to_child(pid);
 
-        // now check if the pid belongs to a firejail sandbox
-        if (invalid_sandbox(pid)) {
-                fprintf(stderr, "Error: no valid sandbox\n");
-                exit(1);
-        }
-
-        // check privileges for non-root users
-        uid_t uid = getuid();
-        if (uid != 0) {
-                uid_t sandbox_uid = pid_get_uid(pid);
-                if (uid != sandbox_uid) {
-                        fprintf(stderr, "Error: permission denied.\n");
-                        exit(1);
-                }
-        }
+        // exit if no permission to join the sandbox
+        check_join_permission(pid);
 
         // find the seccomp filter
         EUID_ROOT();