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Re: [DNG] Linux system can be brought down by sending SIGILL to Systemd




On Fri, 24 May 2019 14:01:35 -0700
Fred <fred@xxxxxxxxxxxx> wrote:

> Hello,
> I subscribe to the Devuan Linux mailing list.  This posting just
> arrived and it appears quite important to Debian.
> 
> -------- Forwarded Message --------
> Subject: 	[DNG] Linux system can be brought down by sending
> SIGILL to Systemd
> Date: 	Fri, 24 May 2019 22:04:34 +0200
> From: 	Martin Steigerwald <martin@xxxxxxxxxxxx>
> To: 	DNG <dng@xxxxxxxxxxxxxx>
> 
> 
> 
> Hi!
> 
> Today in a Linux training a participant attempted to bring down Debian
> workstation with Systemd by sending signals to PID 1 as I invited them
> to try to bring down PID 1 while thinking for myself that this would
> not be possible from my past experiences about trying to bring down
> PID 1 – init – myself.

# while true; do kill -ILL 1 ; echo -n "." ;  sleep 0.5 ; done
...........................^C

no problem here
kernel 5.1.4 stretch amd64 with systemd