4.10 kernel on thinkpad x220: rodata_test: test data was not read only

From: Pavel Machek
Date: Tue Feb 21 2017 - 17:14:52 EST


I'm getting

[ 3.822386] VFS: Mounted root (ext4 filesystem) readonly on device
[ 3.840420] devtmpfs: mounted
[ 3.842346] Freeing unused kernel memory: 536K
[ 3.844081] Write protecting the kernel text: 11764k
[ 3.845753] Write protecting the kernel read-only data: 4780k
[ 3.847326] rodata_test: test data was not read only
[ 3.848906] NX-protecting the kernel data: 6668k
[ 3.850662] x86/mm: Checked W+X mappings: passed, no W+X pages

I guess that means that kernel hardening does not work as
expected... 32bit kernel on thinkpad x220.

Git blame points to

commit edeed30589f5defe63ce6aaae56f2b7c855e4520
Author: Arjan van de Ven <arjan@xxxxxxxxxxxxx>
Date: Wed Jan 30 13:34:08 2008 +0100

x86: add testcases for RODATA and NX protections/attributes

Any ideas?

(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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