grub2: Fix CVE-2015-8370

http://git.savannah.gnu.org/cgit/grub.git/commit/?id=451d80e52d851432e109771bb8febafca7a5f1f2

(From OE-Core rev: 3f2701c102e4e5b95fc79a8d967f9c48f8232fc6)

Signed-off-by: Awais Belal <awais_belal@mentor.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Joshua Lock <joshua.g.lock@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/meta/recipes-bsp/grub/files/0001-Fix-CVE-2015-8370-Grub2-user-pass-vulnerability.patch b/meta/recipes-bsp/grub/files/0001-Fix-CVE-2015-8370-Grub2-user-pass-vulnerability.patch
new file mode 100644
index 0000000..9ddd7a6
--- /dev/null
+++ b/meta/recipes-bsp/grub/files/0001-Fix-CVE-2015-8370-Grub2-user-pass-vulnerability.patch
@@ -0,0 +1,50 @@
+Upstream-Status: Accepted
+Signed-off-by: Awais Belal <awais_belal@mentor.com>
+
+From 451d80e52d851432e109771bb8febafca7a5f1f2 Mon Sep 17 00:00:00 2001
+From: Hector Marco-Gisbert <hecmargi@upv.es>
+Date: Wed, 16 Dec 2015 04:57:18 +0000
+Subject: Fix security issue when reading username and password
+
+This patch fixes two integer underflows at:
+  * grub-core/lib/crypto.c
+  * grub-core/normal/auth.c
+
+CVE-2015-8370
+
+Signed-off-by: Hector Marco-Gisbert <hecmargi@upv.es>
+Signed-off-by: Ismael Ripoll-Ripoll <iripoll@disca.upv.es>
+Also-By: Andrey Borzenkov <arvidjaar@gmail.com>
+---
+Index: grub-2.00/grub-core/lib/crypto.c
+===================================================================
+--- grub-2.00.orig/grub-core/lib/crypto.c
++++ grub-2.00/grub-core/lib/crypto.c
+@@ -458,7 +458,8 @@ grub_password_get (char buf[], unsigned
+ 
+       if (key == '\b')
+ 	{
+-	  cur_len--;
++      if (cur_len)
++        cur_len--;
+ 	  continue;
+ 	}
+ 
+Index: grub-2.00/grub-core/normal/auth.c
+===================================================================
+--- grub-2.00.orig/grub-core/normal/auth.c
++++ grub-2.00/grub-core/normal/auth.c
+@@ -174,8 +174,11 @@ grub_username_get (char buf[], unsigned
+ 
+       if (key == '\b')
+ 	{
+-	  cur_len--;
+-	  grub_printf ("\b");
++      if (cur_len)
++       {
++	     cur_len--;
++	     grub_printf ("\b");
++        }
+ 	  continue;
+ 	}
+