From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 7 Jan 2025 10:46:06 +0000 (+0100)
Subject: userns: refuse empty userns names
X-Git-Tag: v258-rc1~1664^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=364e275319d58c2d9c793b39e390f5d05574add0;p=thirdparty%2Fsystemd.git

userns: refuse empty userns names

Let's tighten rules a bit.
---

diff --git a/src/nsresourced/userns-registry.c b/src/nsresourced/userns-registry.c
index d69348aae71..b1754b51fe7 100644
--- a/src/nsresourced/userns-registry.c
+++ b/src/nsresourced/userns-registry.c
@@ -592,6 +592,9 @@ bool userns_name_is_valid(const char *name) {
 
         /* Checks if the specified string is suitable as user namespace name. */
 
+        if (isempty(name))
+                return false;
+
         if (strlen(name) > NAME_MAX) /* before we use alloca(), let's check for size */
                 return false;