linux-kernel - Re: 4.4-rc5: ugly warn on: 5 W+X pages found

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Message-ID: <CA+55aFytYbvzKcouORDGREPdvXWvUibuxe2opeBhpXxRxZcvKg@mail.gmail.com>
Date:	Tue, 15 Dec 2015 11:08:05 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Pavel Machek <pavel@....cz>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>,
	kernel list <linux-kernel@...r.kernel.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Brian Gerst <brgerst@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Peter Anvin <hpa@...or.com>, Mike Galbraith <efault@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 4.4-rc5: ugly warn on: 5 W+X pages found

On Tue, Dec 15, 2015 at 10:40 AM, Andy Lutomirski <luto@...capital.net> wrote:
>
> Shouldn't we switch those two lines?

No. This is for debugging Pavel's issue. If somehow the
__supported_pte_mask ends up having NX clear again (memory scribble,
whatever), we very explicitly would want to catch that.

I'm *not* suggesting this as a generic patch to be applied anywhere
else. That patch is meant to debug Pavel's particular setup, and
nothing else.

                Linus
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