linux-kernel - [tip:x86/urgent] x86/microcode/AMD: Fix initrd loading with CONFIG_RANDOMIZE

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Date:	Thu, 18 Aug 2016 03:49:58 -0700
From:	tip-bot for Borislav Petkov <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	brgerst@...il.com, bp@...en8.de, linux-kernel@...r.kernel.org,
	bp@...e.de, tglx@...utronix.de, keescook@...omium.org,
	jpoimboe@...hat.com, dvlasenk@...hat.com, hpa@...or.com,
	mingo@...nel.org, peterz@...radead.org,
	torvalds@...ux-foundation.org, luto@...nel.org
Subject: [tip:x86/urgent] x86/microcode/AMD: Fix initrd loading with
 CONFIG_RANDOMIZE_MEMORY=y

Commit-ID:  88b2f634028f1f38dcc3d412e10ff1f224976daa
Gitweb:     http://git.kernel.org/tip/88b2f634028f1f38dcc3d412e10ff1f224976daa
Author:     Borislav Petkov <bp@...en8.de>
AuthorDate: Wed, 17 Aug 2016 13:33:14 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 18 Aug 2016 10:06:49 +0200

x86/microcode/AMD: Fix initrd loading with CONFIG_RANDOMIZE_MEMORY=y

Similar to:

  efaad554b4ff ("x86/microcode/intel: Fix initrd loading with CONFIG_RANDOMIZE_MEMORY=y")

... fix microcode loading from the initrd on AMD by adding the
randomization offset to the microcode patch container within the initrd.

Reported-and-tested-by: Brian Gerst <brgerst@...il.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-tip-commits@...r.kernel.org
Link: http://lkml.kernel.org/r/20160817113314.GA19221@nazgul.tnic
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/microcode/amd.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 27a0228..b816971 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -355,6 +355,7 @@ void load_ucode_amd_ap(void)
 	unsigned int cpu = smp_processor_id();
 	struct equiv_cpu_entry *eq;
 	struct microcode_amd *mc;
+	u8 *cont = container;
 	u32 rev, eax;
 	u16 eq_id;
 
@@ -371,8 +372,11 @@ void load_ucode_amd_ap(void)
 	if (check_current_patch_level(&rev, false))
 		return;
 
+	/* Add CONFIG_RANDOMIZE_MEMORY offset. */
+	cont += PAGE_OFFSET - __PAGE_OFFSET_BASE;
+
 	eax = cpuid_eax(0x00000001);
-	eq  = (struct equiv_cpu_entry *)(container + CONTAINER_HDR_SZ);
+	eq  = (struct equiv_cpu_entry *)(cont + CONTAINER_HDR_SZ);
 
 	eq_id = find_equiv_id(eq, eax);
 	if (!eq_id)
@@ -434,6 +438,9 @@ int __init save_microcode_in_initrd_amd(void)
 	else
 		container = cont_va;
 
+	/* Add CONFIG_RANDOMIZE_MEMORY offset. */
+	container += PAGE_OFFSET - __PAGE_OFFSET_BASE;
+
 	eax   = cpuid_eax(0x00000001);
 	eax   = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);