Patch "efi: Process the MEMATTR table only if EFI_MEMMAP is enabled" has been added to the 4.12-stable tree

Patch "efi: Process the MEMATTR table only if EFI_MEMMAP is enabled" has been added to the 4.12-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    efi: Process the MEMATTR table only if EFI_MEMMAP is enabled

to the 4.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     efi-process-the-memattr-table-only-if-efi_memmap-is-enabled.patch
and it can be found in the queue-4.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 457ea3f7e97881f937136ce0ba1f29f82b9abdb0 Mon Sep 17 00:00:00 2001
From: Daniel Kiper <daniel.kiper@oracle.com>
Date: Thu, 22 Jun 2017 12:51:36 +0200
Subject: efi: Process the MEMATTR table only if EFI_MEMMAP is enabled

From: Daniel Kiper <daniel.kiper@oracle.com>

commit 457ea3f7e97881f937136ce0ba1f29f82b9abdb0 upstream.

Otherwise e.g. Xen dom0 on x86_64 EFI platforms crashes.

In theory we can check EFI_PARAVIRT too, however,
EFI_MEMMAP looks more targeted and covers more cases.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: andrew.cooper3@citrix.com
Cc: boris.ostrovsky@oracle.com
Cc: jgross@suse.com
Cc: linux-efi@vger.kernel.org
Cc: matt@codeblueprint.co.uk
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/1498128697-12943-2-git-send-email-daniel.kiper@oracle.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/firmware/efi/efi.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -528,7 +528,8 @@ int __init efi_config_parse_tables(void
 		}
 	}
 
-	efi_memattr_init();
+	if (efi_enabled(EFI_MEMMAP))
+		efi_memattr_init();
 
 	/* Parse the EFI Properties table if it exists */
 	if (efi.properties_table != EFI_INVALID_TABLE_ADDR) {


Patches currently in stable-queue which might be from daniel.kiper@oracle.com are

queue-4.12/efi-process-the-memattr-table-only-if-efi_memmap-is-enabled.patch
queue-4.12/x86-xen-efi-initialize-only-the-efi-struct-members-used-by-xen.patch