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

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Message-ID: <alpine.DEB.2.20.1705231734130.2740@nanos>
Date:   Tue, 23 May 2017 17:40:39 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
cc:     x86@...utronix.de, Kees Cook <keescook@...omium.org>
Subject: [WARNING] x86/mm: Found insecure W+X mapping at address ..

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.

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