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

From	<tomas@tuxteam.de>
Newsgroups	linux.debian.user
Subject	Re: [DNG] Linux system can be brought down by sending SIGILL to Systemd
Date	2019-05-25 14:10 +0200
Message-ID	<y1DER-2VO-1@gated-at.bofh.it> (permalink)
References	<y1pVf-2LG-5@gated-at.bofh.it> <y1pVf-2LG-3@gated-at.bofh.it> <y1qxX-3eQ-3@gated-at.bofh.it> <y1r0Z-3pF-1@gated-at.bofh.it> <y1zBf-ik-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Sat, May 25, 2019 at 10:25:26AM +0300, Reco wrote:

[...]

> Seems harmless to me as one needs to be root to send signals to PID 1.

This is *exactly* the point. If you are root, there are far more creative
(and fun) ways to bring down your system, regardless of how your init
process is called.

I'll pay a virtual beer [1] to the first one here which comes with a shell
one-liner overwriting the first gig of init's heap space with /dev/urandom
(say the modern and correct moral equivalent of

  dd if=/dev/urandom of=/proc/1/mem bs=4096 count=256k 

... shouldn't be hard).

Cheers

[1] exchangeable by some physical $beverage of choice should we meet
   in person.

-- t

Thread

Fwd: [DNG] Linux system can be brought down by sending SIGILL to  Systemd Fred <fred@blakemfg.com> - 2019-05-24 23:30 +0200
  Re: [DNG] Linux system can be brought down by sending SIGILL to  Systemd arne <sp113438@telfort.nl> - 2019-05-25 00:10 +0200
    Re: [DNG] Linux system can be brought down by sending SIGILL to  Systemd arne <sp113438@telfort.nl> - 2019-05-25 00:40 +0200
      Re: [DNG] Linux system can be brought down by sending SIGILL to  Systemd Reco <recoverym4n@enotuniq.net> - 2019-05-25 09:50 +0200
        Re: [DNG] Linux system can be brought down by sending SIGILL to  Systemd mick crane <mick.crane@gmail.com> - 2019-05-25 11:00 +0200
        Re: [DNG] Linux system can be brought down by sending SIGILL to  Systemd <tomas@tuxteam.de> - 2019-05-25 14:10 +0200
      Re: [DNG] Linux system can be brought down by sending SIGILL to  Systemd - PID 1 is killed it seems arne <sp113438@telfort.nl> - 2019-05-25 11:50 +0200
        Re: [DNG] Linux system can be brought down by sending SIGILL to  Systemd - PID 1 is killed it seems Kenneth Parker <sea7kenp@gmail.com> - 2019-05-25 15:00 +0200
          Re: [DNG] Linux system can be brought down by sending SIGILL to  Systemd - PID 1 is killed it seems <tomas@tuxteam.de> - 2019-05-25 15:30 +0200
          Re: [DNG] Linux system can be brought down by sending SIGILL to  Systemd - PID 1 is killed it seems arne <sp113438@telfort.nl> - 2019-05-25 15:30 +0200
  [Possibly fake news] [DNG] Linux system can be brought down by  sending SIGILL to Systemd <tomas@tuxteam.de> - 2019-05-25 08:40 +0200
    Re: [Possibly fake news] [DNG] Linux system can be brought down by  sending SIGILL to Systemd Curt <curty@free.fr> - 2019-05-25 10:20 +0200
    Re: [Possibly fake news] [DNG] Linux system can be brought down by  sending SIGILL to Systemd Nicolas George <george@nsup.org> - 2019-05-25 12:20 +0200

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