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

From: Thomas Gleixner
Date: Tue May 23 2017 - 11:40:46 EST


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