linux-kernel - Re: [WARNING] x86/mm: Found insecure W+X mapping at address ..

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Message-ID: <CAGXu5jK-=c00ppm7h7ZgH7iVpRqRBLUQusYgm7yW4JDZ+r4RYw@mail.gmail.com>
Date:   Tue, 23 May 2017 08:54:48 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...utronix.de,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>
Subject: Re: [WARNING] x86/mm: Found insecure W+X mapping at address ..

On Tue, May 23, 2017 at 8:40 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> As of 4.12-rc1 one of my machines triggers the insecure W+X mapping.
>
> It's consistenly 9 entries close to the beginning of the module space,
> before the first actual module starts. See below.
>
> Any ideas which avoid bisecting would be appreciated.

Is this the same as:

https://lkml.org/lkml/2017/5/19/899

?

The location is very similar.

-Kees

>
> Thanks,
>
>         tglx
>
> ---[ Modules ]---
> 0xffffffffc0000000-0xffffffffc017d000        1524K                               pte
> 0xffffffffc017d000-0xffffffffc017e000           4K     RW                 GLB x  pte
> 0xffffffffc017e000-0xffffffffc017f000           4K                               pte
> 0xffffffffc017f000-0xffffffffc0180000           4K     RW                 GLB x  pte
> 0xffffffffc0180000-0xffffffffc0181000           4K                               pte
> 0xffffffffc0181000-0xffffffffc0182000           4K     RW                 GLB x  pte
> 0xffffffffc0182000-0xffffffffc0183000           4K                               pte
> 0xffffffffc0183000-0xffffffffc0184000           4K     RW                 GLB x  pte
> 0xffffffffc0184000-0xffffffffc0185000           4K                               pte
> 0xffffffffc0185000-0xffffffffc0186000           4K     RW                 GLB x  pte
> 0xffffffffc0186000-0xffffffffc0187000           4K                               pte
> 0xffffffffc0187000-0xffffffffc0188000           4K     RW                 GLB x  pte
> 0xffffffffc0188000-0xffffffffc0189000           4K                               pte
> 0xffffffffc0189000-0xffffffffc018a000           4K     RW                 GLB x  pte
> 0xffffffffc018a000-0xffffffffc018b000           4K                               pte
> 0xffffffffc018b000-0xffffffffc018c000           4K     RW                 GLB x  pte
> 0xffffffffc018c000-0xffffffffc018d000           4K                               pte
> 0xffffffffc018d000-0xffffffffc018e000           4K     RW                 GLB x  pte
>
> First module starts here:
>
> 0xffffffffc018e000-0xffffffffc0191000          12K                               pte
> 0xffffffffc0191000-0xffffffffc0192000           4K     ro                 GLB x  pte
>
> ---[ Modules ]---
> 0xffffffffc0000000-0xffffffffc0200000           2M                               pmd
> 0xffffffffc0200000-0xffffffffc02f8000         992K                               pte
> 0xffffffffc02f8000-0xffffffffc02f9000           4K     RW                 GLB x  pte
> 0xffffffffc02f9000-0xffffffffc02fa000           4K                               pte
> 0xffffffffc02fa000-0xffffffffc02fb000           4K     RW                 GLB x  pte
> 0xffffffffc02fb000-0xffffffffc02fc000           4K                               pte
> 0xffffffffc02fc000-0xffffffffc02fd000           4K     RW                 GLB x  pte
> 0xffffffffc02fd000-0xffffffffc02fe000           4K                               pte
> 0xffffffffc02fe000-0xffffffffc02ff000           4K     RW                 GLB x  pte
> 0xffffffffc02ff000-0xffffffffc0300000           4K                               pte
> 0xffffffffc0300000-0xffffffffc0301000           4K     RW                 GLB x  pte
> 0xffffffffc0301000-0xffffffffc0302000           4K                               pte
> 0xffffffffc0302000-0xffffffffc0303000           4K     RW                 GLB x  pte
> 0xffffffffc0303000-0xffffffffc0304000           4K                               pte
> 0xffffffffc0304000-0xffffffffc0305000           4K     RW                 GLB x  pte
> 0xffffffffc0305000-0xffffffffc0306000           4K                               pte
> 0xffffffffc0306000-0xffffffffc0307000           4K     RW                 GLB x  pte
> 0xffffffffc0307000-0xffffffffc0308000           4K                               pte
> 0xffffffffc0308000-0xffffffffc0309000           4K     RW                 GLB x  pte
>
> First module starts here:
>
> 0xffffffffc0309000-0xffffffffc030c000          12K                               pte
> 0xffffffffc030c000-0xffffffffc030d000           4K     ro                 GLB x  pte



-- 
Kees Cook
Pixel Security