linux-kernel - 4.10 kernel on thinkpad x220: rodata

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Message-ID: <20170221221425.GB6918@amd>
Date:   Tue, 21 Feb 2017 23:14:25 +0100
From:   Pavel Machek <pavel@....cz>
To:     kernel list <linux-kernel@...r.kernel.org>, arjan@...radead.org,
        mingo@...e.hu, tglx@...utronix.de
Subject: 4.10 kernel on thinkpad x220: rodata_test: test data was not read
 only

Hi!

I'm getting

[    3.822386] VFS: Mounted root (ext4 filesystem) readonly on device
8:4.
[    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
found.

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@...radead.org>
Date:   Wed Jan 30 13:34:08 2008 +0100

    x86: add testcases for RODATA and NX protections/attributes

Any ideas?
									Pavel

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

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