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

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Message-ID: <566F3378.8070009@linux.intel.com>
Date:	Mon, 14 Dec 2015 13:24:08 -0800
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Andy Lutomirski <luto@...capital.net>, Pavel Machek <pavel@....cz>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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


> That's weird.  The only API to do that seems to be manually setting
> kmap_prot to _PAGE_KERNEL_EXEC, and nothing does that.  (Why is
> kmap_prot a variable on x86 at all?  It has exactly one writer, and
> that's the code that initializes it in the first place.  Shouldn't we
> #define kmap_prot _PAGE_KERNEL?

iirc it changes based on runtime detection of NX capability

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