linux-kernel - Re: [PATCH] x86/microcode: Do not access the initrd after it has been freed

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Date:   Tue, 31 Jan 2017 19:03:21 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Mike Galbraith <efault@....de>
cc:     Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86/microcode: Do not access the initrd after it has
 been freed

On Tue, 31 Jan 2017, Mike Galbraith wrote:

> On Tue, 2017-01-31 at 11:01 +0100, Borislav Petkov wrote:
> > On Tue, Jan 31, 2017 at 08:43:55AM +0100, Ingo Molnar wrote:
> > > (Cc:-ed Mike as this could explain his early boot crash/hang?
> > >         Mike: please try -tip f18a8a0143b1 that I just pushed out. )
> > 
> > One other thing to try, Mike, is boot with "dis_ucode_ldr". See whether
> > that makes it go away.
> 
> (bisect fingered irqdomain: Avoid activating interrupts more than once)

That commit exposed interesting code in x86 land. Can you please try the
patch below?

Thanks,

	tglx
8<--------------

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 1e35dd06b090..52f352b063fd 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2117,6 +2117,7 @@ static inline void __init check_timer(void)
 			if (idx != -1 && irq_trigger(idx))
 				unmask_ioapic_irq(irq_get_chip_data(0));
 		}
+		irq_domain_deactivate_irq(irq_data);
 		irq_domain_activate_irq(irq_data);
 		if (timer_irq_works()) {
 			if (disable_timer_pin_1 > 0)
@@ -2138,6 +2139,7 @@ static inline void __init check_timer(void)
 		 * legacy devices should be connected to IO APIC #0
 		 */
 		replace_pin_at_irq_node(data, node, apic1, pin1, apic2, pin2);
+		irq_domain_deactivate_irq(irq_data);
 		irq_domain_activate_irq(irq_data);
 		legacy_pic->unmask(0);
 		if (timer_irq_works()) {
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 85e87b46c318..dc6ba5bda9fc 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -352,6 +352,7 @@ static int hpet_resume(struct clock_event_device *evt, int timer)
 	} else {
 		struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt);
 
+		irq_domain_deactivate_irq(irq_get_irq_data(hdev->irq));
 		irq_domain_activate_irq(irq_get_irq_data(hdev->irq));
 		disable_irq(hdev->irq);
 		irq_set_affinity(hdev->irq, cpumask_of(hdev->cpu));