From: Ludwig Nussel <ludwig.nussel@suse.de>
Date: Tue, 30 Nov 2021 16:14:14 +0000 (+0100)
Subject: useradd: assume uid 0 == root as fallback
X-Git-Tag: 4.10~12^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F450%2Fhead;p=thirdparty%2Fshadow.git

useradd: assume uid 0 == root as fallback

In absence of /etc/passwd, eg when bootstrapping a chroot, resolving
uid 0 to a name may not work. Therefore just assume "root".
---

diff --git a/src/useradd.c b/src/useradd.c
index f7c979580..16447671c 100644
--- a/src/useradd.c
+++ b/src/useradd.c
@@ -2507,14 +2507,14 @@ int main (int argc, char **argv)
 	{
 		struct passwd *pampw;
 		pampw = getpwuid (getuid ()); /* local, no need for xgetpwuid */
-		if (pampw == NULL) {
+		if (pampw == NULL && getuid ()) {
 			fprintf (stderr,
 			         _("%s: Cannot determine your user name.\n"),
 			         Prog);
 			fail_exit (1);
 		}
 
-		retval = pam_start ("useradd", pampw->pw_name, &conv, &pamh);
+		retval = pam_start ("useradd", pampw?pampw->pw_name:"root", &conv, &pamh);
 	}
 
 	if (PAM_SUCCESS == retval) {