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

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Message-ID: <CA+55aFwivS6pnNKqy6aFrh4H5HC2izW_Rw0GL1hV9EdbV+HhkA@mail.gmail.com>
Date:	Mon, 14 Dec 2015 11:18:41 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Borislav Petkov <bp@...en8.de>,
	kernel list <linux-kernel@...r.kernel.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Andy Lutomirski <luto@...capital.net>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	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 Mon, Dec 14, 2015 at 1:07 AM, Pavel Machek <pavel@....cz> wrote:
>
> I know. But either someone cares, and it should be fixes, or noone
> cares, and the check should be removed.

Someone cares, and it should be scheduled to be fixed for 4.5. The EFI
mapping changes that were required to avoid the warning were much too
big and late to make 4.4.

So for now, don't enable CONFIG_DEBUG_WX for now. Unless you want to
actively debug the EFI mapping changes, that is. Which I heartily
recommend people doing.

(The patches are in Matt Fleming's tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi.git efi-pgtable

and I think they are also merged in the -tip tree for next, but I
haven't double-checked)

                 Linus
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