linux-kernel - Re: process '/usr/bin/rsync' started with executable stack

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Date:   Wed, 24 Jun 2020 00:22:14 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Christian Kujau <lists@...dbynature.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Willy Tarreau <w@....eu>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Kees Kook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Subject: Re: process '/usr/bin/rsync' started with executable stack

On Wed, Jun 24, 2020 at 12:12:18AM +0300, Alexey Dobriyan wrote:
> On Tue, Jun 23, 2020 at 10:39:26AM -0700, Christian Kujau wrote:
> > Hi,
> > 
> > exactly this[0] happened today, on a 5.6.5 kernel:
> > 
> >   process '/usr/bin/rsync' started with executable stack
> > 
> > But I can't reproduce this message,

This message is once-per-reboot.

If you run something with exec stack after the message
you shouldn't get it second time.

If you rebooted and rsync starts clean, then it is separate story.

> > and rsync (v3.2.0, not exactly 
> > abandonware) runs several times a day, so to repeat Andrew's questions[0] 
> > from last year:
> > 
> >   > What are poor users supposed to do if this message comes out? 
> >   > Hopefully google the message and end up at this thread.  What do you
> >   > want to tell them?
> > 
> > Also, the PID is missing from that message.
> 
> That's intentional. I for one hate pids.
> 
> > I had some long running rsync 
> > processes running earlier, maybe the RWE status would have been visible in 
> > /proc/$PID/map, or somewhere else maybe?
> 
> If you think process is still running, /proc/*/maps should have 'rwxp'
> indeed. You can do quick
> 
> 	$ grep -e '\[stack\]' /proc/*/maps'
> 
> to find it.

Run as root obviously, or you won't get full picture.