1 files changed, 13 insertions, 0 deletions

diff --git a/src/firejail/main.c b/src/firejail/main.c
index 57fe4fb22..02fcb77d7 100644
--- a/src/firejail/main.c
+++ b/src/firejail/main.c
@@ -2172,11 +2172,24 @@ int main(int argc, char **argv, char **envp) {
                 // hostname, etc
                 //*************************************
                 else if (strncmp(argv[i], "--name=", 7) == 0) {
+                        int only_numbers = 1;
                         cfg.name = argv[i] + 7;
                         if (strlen(cfg.name) == 0) {
                                 fprintf(stderr, "Error: please provide a name for sandbox\n");
                                 return 1;
                         }
+                        const char *c = cfg.name;
+                        while (*c) {
+                                if (!isdigit(*c)) {
+                                        only_numbers = 0;
+                                        break;
+                                }
+                                ++c;
+                        }
+                        if (only_numbers) {
+                                fprintf(stderr, "Error: invalid sandbox name: it only contains digits\n");
+                                return 1;
+                        }
                 }
                 else if (strncmp(argv[i], "--hostname=", 11) == 0) {
                         cfg.hostname = argv[i] + 11;