grub2/0001-unix-do-not-close-stdin-in-grub_passwd_get.patch

From 6a46cbcc5c1c746562fd7181bf0f2337db065201 Mon Sep 17 00:00:00 2001
From: Andrei Borzenkov <arvidjaar@gmail.com>
Date: Wed, 18 Nov 2015 22:23:58 +0300
Subject: [PATCH] unix: do not close stdin in grub_passwd_get

This makes it impossible to read from stdin without controlling tty:

10:/mnt # echo -e passwd\\npasswd | setsid ./grub-mkpasswd-pbkdf2
Enter password:
Reenter password: ./grub-mkpasswd-pbkdf2: error: failure to read password.
10:/mnt
---
 grub-core/osdep/unix/password.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/grub-core/osdep/unix/password.c b/grub-core/osdep/unix/password.c
index 4b9507b..9996b24 100644
--- a/grub-core/osdep/unix/password.c
+++ b/grub-core/osdep/unix/password.c
@@ -54,7 +54,8 @@ grub_password_get (char buf[], unsigned buf_size)
   grub_memset (buf, 0, buf_size);
   if (!fgets (buf, buf_size, stdin))
     {
-      fclose (in);
+      if (in != stdin)
+	fclose (in);
       return 0;
     }
   ptr = buf + strlen (buf) - 1;
@@ -67,7 +68,8 @@ grub_password_get (char buf[], unsigned buf_size)
   grub_xputs ("\n");
   grub_refresh ();
 
-  fclose (in);
+  if (in != stdin)
+    fclose (in);
 
   return 1;
 }
-- 
1.9.1