From 6c6e04f2699a6755d7a29e6fc1679b292600616c Mon Sep 17 00:00:00 2001
From: Toomas Soome <tsoome@me.com>
Date: Wed, 29 Nov 2017 18:04:01 +0200
Subject: [PATCH] 8875 loader.efi: efipart should exclude iPXE stub block
 protocol Reviewed by: Jason King <jason.brian.king@gmail.com> Approved by:
 Dan McDonald <danmcd@joyent.com>

---
 usr/src/boot/sys/boot/efi/libefi/efipart.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/usr/src/boot/sys/boot/efi/libefi/efipart.c b/usr/src/boot/sys/boot/efi/libefi/efipart.c
index 347c14f68a..2640201698 100644
--- a/usr/src/boot/sys/boot/efi/libefi/efipart.c
+++ b/usr/src/boot/sys/boot/efi/libefi/efipart.c
@@ -239,6 +239,16 @@ efipart_hdd(EFI_DEVICE_PATH *dp)
 		    !blkio->Media->MediaPresent) {
 			return (false);
 		}
+
+		/*
+		 * We assume the block size 512 or greater power of 2.
+		 * iPXE is known to insert stub BLOCK IO device with
+		 * BlockSize 1.
+		 */
+		if (blkio->Media->BlockSize < 512 ||
+		    !powerof2(blkio->Media->BlockSize)) {
+			return (false);
+		}
 	}
 	return (true);
 }
-- 
2.11.4.GIT