linux-kernel - Re: a13c600e15 ("x86/mm/pti: Move user W+X check into .."): WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:283 note

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Date:   Fri, 10 Aug 2018 09:30:16 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     kernel test robot <lkp@...el.com>
Cc:     LKP <lkp@...org>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: a13c600e15 ("x86/mm/pti: Move user W+X check into .."): WARNING:
 CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:283 note_page

On Fri, Aug 10, 2018 at 06:33:42AM +0800, kernel test robot wrote:
> [    9.635329] x86/mm: Checking user space page tables
> [    9.636271] ------------[ cut here ]------------
> [    9.637045] x86/mm: Found insecure W+X mapping at address (ptrval)/0xffc01000
> [    9.638228] WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:283 note_page+0x66b/0x870

Hmm, weird, this warning triggers for 32-bit non-pae. There is no
NX-bit in this mode, so the check shouldn't happen there. I'll
investigate.


	Joerg