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Message-ID: <CAJZ5v0iAuDYZhmXqG12ZtEpQ5FEzP9Wp4a=EqApwwCc1VBvbLg@mail.gmail.com>
Date: Thu, 11 Aug 2016 02:35:48 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Jiri Kosina <jikos@...nel.org>,
Thomas Garnier <thgarnie@...gle.com>
Cc: Borislav Petkov <bp@...e.de>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Linux PM list <linux-pm@...r.kernel.org>,
"the arch/x86 maintainers" <x86@...nel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Yinghai Lu <yinghai@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H . Peter Anvin" <hpa@...or.com>,
Kees Cook <keescook@...omium.org>, Pavel Machek <pavel@....cz>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: Re: [Resend][PATCH] x86/power/64: Always create temporary identity
mapping correctly
On Wed, Aug 10, 2016 at 11:59 PM, Jiri Kosina <jikos@...nel.org> wrote:
> On Wed, 10 Aug 2016, Rafael J. Wysocki wrote:
>
>> So I used your .config to generate one for my test machine and with
>> that I can reproduce.
>
> Was that the config I've sent, or did Boris provide one as well? Which one
> are you able to reproduce with please?
It's the Boris' one.
Moreover, I have found the options that make the difference: unsetting
CONFIG_PROVE_LOCKING and CONFIG_DEBUG_LOCK_ALLOC (which also will
unset CONFIG_LOCKDEP AFAICS) in it makes hibernation work again with
CONFIG_RANDOMIZE_MEMORY set and with the $subject patch applied.
Unbelievable, but that's what I'm seeing.
Now, that leads to a few questions:
- How does lockdep change the picture so it matters for hibernation?
- Why is hibernation the only piece that's affected?
- Why is RANDOMIZE_MEMORY necessary to make this breakage show up?
Thomas, any ideas?
Thanks,
Rafael
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