linux-kernel - Re: next-20180605 - kernel tried to execute NX-protected page

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Message-ID: <136327.1528411295@turing-police.cc.vt.edu>
Date:   Thu, 07 Jun 2018 18:41:35 -0400
From:   valdis.kletnieks@...edu
To:     Mike Snitzer <snitzer@...hat.com>
Cc:     Alasdair Kergon <agk@...hat.com>, linux-kernel@...r.kernel.org,
        dm-devel@...hat.com, axboe@...nel.dk
Subject: Re: next-20180605 - kernel tried to execute NX-protected page - exploit attempt?

On Thu, 07 Jun 2018 17:14:01 -0400, Mike Snitzer said:
> Can you please share what you test is?  We've gotten lots of reports
> with failure following wake_up but I don't have a canned test to trigger

Just a laptop with 16G of RAM, no clear reproducer -  Chrome with a lot of
tabs, a mail reader, a bunch of SSH windows, and the next thing I know, it's
locked up good and solid with wreckage in /sys/fs/pstore :)

I got bit a third time a little while ago.  Will test the patches and see if
they help - looks like I'm averaging two hours or so of active use before it
hits, so it shouldn't take long before I know if the issue is swatted...

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