1 files changed, 8 insertions, 0 deletions

diff --git a/src/firejail/main.c b/src/firejail/main.c
index 593835843..7cfa58078 100644
--- a/src/firejail/main.c
+++ b/src/firejail/main.c
@@ -982,6 +982,14 @@ int main(int argc, char **argv, char **envp) {
         int arg_caps_cmdline = 0;       // caps requested on command line (used to break out of --chroot)
         char **ptr;
 
+#ifndef HAVE_SUID
+        if (geteuid() != 0) {
+                fprintf(stderr, "Error: Firejail needs to be SUID.\n");
+                fprintf(stderr, "Assuming firejail is installed in /usr/bin, execute the following command as root:\n");
+                fprintf(stderr, "  chmod u+s /usr/bin/firejail\n");
+        }
+#endif
+
         // sanitize the umask
         orig_umask = umask(022);