Patch "x86/MCE/AMD: Always give panic severity for UC errors in kernel context" has been added to the 4.14-stable tree

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

x86/MCE/AMD: Always give panic severity for UC errors in kernel context

to the 4.14-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:
x86-mce-amd-always-give-panic-severity-for-uc-errors-in-kernel-context.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From d65dfc81bb3894fdb68cbc74bbf5fb48d2354071 Mon Sep 17 00:00:00 2001
From: Yazen Ghannam <[email protected]>
Date: Mon, 6 Nov 2017 18:46:32 +0100
Subject: x86/MCE/AMD: Always give panic severity for UC errors in kernel context

From: Yazen Ghannam <[email protected]>

commit d65dfc81bb3894fdb68cbc74bbf5fb48d2354071 upstream.

The AMD severity grading function was introduced in kernel 4.1. The current logic can possibly give MCE_AR_SEVERITY for uncorrectable errors in kernel context. The system may then get stuck in a loop as memory_failure() will try to handle the bad kernel memory and find it busy.

Return MCE_PANIC_SEVERITY for all UC errors IN_KERNEL context on AMD systems.

After:

b2f9d678e28c ("x86/mce: Check for faults tagged in EXTABLE_CLASS_FAULT exception table entries")

was accepted in v4.6, this issue was masked because of the tail-end attempt at kernel mode recovery in the #MC handler.

However, uncorrectable errors IN_KERNEL context should always be considered unrecoverable and cause a panic.

---
 arch/x86/kernel/cpu/mcheck/mce-severity.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/x86-mce-amd-always-give-panic-severity-for-uc-errors-in-kernel-context.patch --
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@@ -245,6 +245,9 @@ static int mce_severity_amd(struct mce *
 
 	if (m->status & MCI_STATUS_UC) {
 
+		if (ctx == IN_KERNEL)
+			return MCE_PANIC_SEVERITY;
+
 		/*
 		 * On older systems where overflow_recov flag is not present, we
 		 * should simply panic if an error overflow occurs. If

@@ -255,10 +258,6 @@ static int mce_severity_amd(struct mce *
 			if (mce_flags.smca)
 				return mce_severity_amd_smca(m, ctx);
 
-			/* software can try to contain */
-			if (!(m->mcgstatus & MCG_STATUS_RIPV) && (ctx == IN_KERNEL))
-				return MCE_PANIC_SEVERITY;
-
 			/* kill current process */
 			return MCE_AR_SEVERITY;
 		} else {