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Date:   Tue, 23 Jun 2020 16:20:01 -0700
From:   Kees Cook <keescook@chromium.org>
To:     Alexey Dobriyan <adobriyan@gmail.com>
Cc:     Christian Kujau <lists@nerdbynature.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Willy Tarreau <w@1wt.eu>,
        Dan Carpenter <dan.carpenter@oracle.com>,
        linux-kernel@vger.kernel.org
Subject: Re: process '/usr/bin/rsync' started with executable stack
Message-ID: <202006231619.38108DE0@keescook>
References: <alpine.DEB.2.22.1.446.2006231023390.3892@trent.utfs.org>
 <20200623211218.GA40110@localhost.localdomain>
 <20200623212214.GA41702@localhost.localdomain>
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On Wed, Jun 24, 2020 at 12:22:14AM +0300, Alexey Dobriyan wrote:
> 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 want to reset this flag, you can do:

 # echo 1 > /sys/kernel/debug/clear_warn_once

-- 
Kees Cook