Date: Mon, 14 Dec 2015 21:26:27 +0100
From: Pavel Machek <pavel@ucw.cz>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>, kernel list <linux-kernel@vger.kernel.org>,
        Stephen Smalley <sds@tycho.nsa.gov>,
        Andy Lutomirski <luto@amacapital.net>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Brian Gerst <brgerst@gmail.com>, Denys Vlasenko <dvlasenk@redhat.com>,
        Peter Anvin <hpa@zytor.com>, Mike Galbraith <efault@gmx.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: 4.4-rc5: ugly warn on: 5 W+X pages found
Message-ID: <20151214202627.GA15104@amd>
References: <20151115070022.GA15417@amd>
 <20151214080403.GA3708@amd>
 <20151214085803.GA10520@pd.tnic>
 <20151214090726.GA6472@amd>
 <CA+55aFwivS6pnNKqy6aFrh4H5HC2izW_Rw0GL1hV9EdbV+HhkA@mail.gmail.com>
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Hi!

> > 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.

Ok, good, except... This is thinkpad X60. Good old BIOS. It should
have no EFI.

pavel@duo:~$ dmesg | grep EFI
pavel@duo:~$

>From the messages I got:

> [    3.285993] x86/mm: Found insecure W+X mapping at address
> ffe69000/0xffe69000

---[ Persisent kmap() Area ]---
0xffc00000-0xffd28000        1184K                               pte
0xffd28000-0xffddd000         724K     RW                 GLB NX pte
0xffddd000-0xffe69000         560K                               pte
0xffe69000-0xffe6e000          20K     RW                 GLB x  pte
0xffe6e000-0xffe6f000           4K                               pte
---[ Fixmap Area ]---

That is not EFI, right?

Thanks,
									Pavel


-- 
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