[PATCH] x86-64: Verify alignment of LOAD segment

[H.J. Lu]

Since x86-64 kernel must be aligned to 2MB, refuse to boot kernel if
alignment of LOAD segment isn't multiple of 2MB.

Signed-off-by: H.J. Lu <hjl.tools@xxxxxxxxx>

-- 
H.J.
From 25015cf0252d1a4a0c532f391a314e343a5022dd Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@xxxxxxxxx>
Date: Tue, 27 Feb 2018 11:41:35 -0800
Subject: [PATCH] x86-64: Verify alignment of LOAD segment

Since x86-64 kernel must be aligned to 2MB, refuse to boot kernel if
alignment of LOAD segment isn't multiple of 2MB.

Signed-off-by: H.J. Lu <hjl.tools@xxxxxxxxx>
---
 arch/x86/boot/compressed/misc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 98761a1576ce..252fee320816 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -309,6 +309,10 @@ static void parse_elf(void *output)
 
 		switch (phdr->p_type) {
 		case PT_LOAD:
+#ifdef CONFIG_X86_64
+			if ((phdr->p_align % 0x200000) != 0)
+				error("Alignment of LOAD segment isn't multiple of 2MB");
+#endif
 #ifdef CONFIG_RELOCATABLE
 			dest = output;
 			dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
-- 
2.14.3