From cb569337f22de160d61df0bdb7c06f17517835ab Mon Sep 17 00:00:00 2001
From: zhangshaoning <zhangshaoning@uniontech.com>
Date: Thu, 16 Jan 2025 16:30:09 +0800
Subject: [PATCH] limit username length to 32

---
 lib/chkname.c | 4 ++--
 lib/chkname.h | 4 ++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/chkname.c b/lib/chkname.c
index 2b83361..ae6180f 100644
--- a/lib/chkname.c
+++ b/lib/chkname.c
@@ -75,9 +75,9 @@ static bool is_valid_name (const char *name)
 bool is_valid_user_name (const char *name)
 {
 	/*
-	 * User names length are limited by the kernel
+	 * User names length are limited by USER_NAME_MAX_LENGTH
 	 */
-	if (strlen (name) > sysconf(_SC_LOGIN_NAME_MAX)) {
+	if (strlen (name) > USER_NAME_MAX_LENGTH) {
 		return false;
 	}
 
diff --git a/lib/chkname.h b/lib/chkname.h
index 0771347..4af8f32 100644
--- a/lib/chkname.h
+++ b/lib/chkname.h
@@ -25,3 +25,7 @@ extern bool is_valid_user_name (const char *name);
 extern bool is_valid_group_name (const char *name);
 
 #endif
+
+#ifndef USER_NAME_MAX_LENGTH
+#define USER_NAME_MAX_LENGTH 32
+#endif
-- 
2.18.2