From: H. Peter Anvin <hpa@zytor.com>
Date: Thu, 7 May 2009 00:56:51 +0000 (-0700)
Subject: x86, boot: zero EFLAGS on 32 bits
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=97541912785369925723b6255438ad9fce2ddf04;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

x86, boot: zero EFLAGS on 32 bits

The 64-bit code already clears EFLAGS as soon as it has a stack.  This
seems like a reasonable precaution, so do it on 32 bits as well.

[ Impact: extra paranoia ]

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---

diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
index d7245cf80261..d02a4f02be13 100644
--- a/arch/x86/boot/compressed/head_32.S
+++ b/arch/x86/boot/compressed/head_32.S
@@ -91,6 +91,10 @@ ENTRY(startup_32)
 	/* Set up the stack */
 	leal	boot_stack_end(%ebx), %esp
 
+	/* Zero EFLAGS */
+	pushl	$0
+	popfl
+
 /*
  * Copy the compressed kernel to the end of our buffer
  * where decompression in place becomes safe.