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

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Date:	Tue, 15 Dec 2015 23:07:09 +0100
From:	Pavel Machek <pavel@....cz>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	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 2015-12-15 22:33:59, Borislav Petkov wrote:
> On Tue, Dec 15, 2015 at 09:58:35PM +0100, Pavel Machek wrote:
> > [    0.000000] Base memory trampoline at [c009b000] 9b000 size 16384
> > [    0.000000] ------------[ cut here ]------------
> > [    0.000000] WARNING: CPU: 0 PID: 0 at
> > ./arch/x86/include/asm/pgtable.h:357 kernel_physical_mapping_init+0x
> > 256/0x395()
> > [    0.000000] Modules linked in:
> > [    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.4.0-rc5+ #137
> > [    0.000000] Hardware name: LENOVO 17097HU/17097HU, BIOS 7BETD8WW
> > (2.19 ) 03/31/2011
> > [    0.000000]  00000000 00000000 c4e63e90 c42baaf8 00000000 c4e63eac
> > c404066b 00000165
> > [    0.000000]  c4f134da 00000000 00000000 00000000 c4e63ebc c404070f
> > 00000009 00000000
> > [    0.000000]  c4e63f18 c4f134da c4e63f00 00000000 00000000 00000000
> > 00000000 00000000
> > [    0.000000] Call Trace:
> > [    0.000000]  [<c42baaf8>] dump_stack+0x41/0x59
> > [    0.000000]  [<c404066b>] warn_slowpath_common+0x6b/0xa0
> > [    0.000000]  [<c4f134da>] ?
> > kernel_physical_mapping_init+0x256/0x395
> > [    0.000000]  [<c404070f>] warn_slowpath_null+0xf/0x20
> > [    0.000000]  [<c4f134da>] kernel_physical_mapping_init+0x256/0x395
> > [    0.000000]  [<c4a4de21>] init_memory_mapping+0x191/0x300
> > [    0.000000]  [<c4f12d96>] init_mem_mapping+0xe7/0x1f3
> 
> Looks like the ISA range to me:
> 
> init_mem_mapping:
> 
> 	...
> 
>         /* the ISA range is always mapped regardless of memory holes */
>         init_memory_mapping(0, ISA_END_ADDRESS);
> 
> Does that kernel_physical_mapping_init() even pay attention to
> __supported_pte_mask and thus _PAGE_NX? I don't see it.

Mystery solved, and prize goes to the lguest.

									Pavel
-- 
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