From: clemc@ccc.com (Clem Cole)
Subject: [TUHS] Harvard and Von Neumann Architectures and Unix
Date: Mon, 27 Nov 2017 12:08:08 -0500 [thread overview]
Message-ID: <CAC20D2PYHFeNeYeghssFcCSuydf_L-Kf-ruXABJdL-duNb9frQ@mail.gmail.com> (raw)
In-Reply-To: <20171127165046.GD3430@mcvoy.com>
SPICE2 does the same sort of thing (in semi-portable Fortran-IV)
On Mon, Nov 27, 2017 at 11:50 AM, Larry McVoy <lm at mcvoy.com> wrote:
> On Mon, Nov 27, 2017 at 11:11:41AM -0500, Noel Chiappa wrote:
> > > From: Doug McIlroy
> >
> > > But if that had been in D space, it couldn't have been executed.
> >
> > Along those lines, I was wondering about modern OS's, which I gather for
> > security reasons prevent execution of data, and prevent writing to code.
> >
> > Programs which emit these little 'custom code fragments' (I prefer that
> term,
> > since they aren't really 'self-modifying code' - which I define as 'a
> program
> > which _changes_ _existing_ instructions) must have some way of having a
> chunk
> > of memory into which they can write, but which can also be executed.
>
> Isn't that how dtrace works?
>
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next prev parent reply other threads:[~2017-11-27 17:08 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-27 16:11 Noel Chiappa
2017-11-27 16:50 ` Larry McVoy
2017-11-27 17:08 ` Clem Cole [this message]
2017-11-27 18:21 ` Lawrence Stewart
2017-11-27 18:30 ` Lars Brinkhoff
2017-11-27 18:14 ` Warner Losh
2017-11-27 18:26 ` Paul Winalski
2017-11-27 17:35 ` Ian Zimmerman
2017-11-28 14:55 ` Tim Bradshaw
2017-11-28 19:45 ` Paul Winalski
-- strict thread matches above, loose matches on Subject: below --
2017-11-27 17:11 Noel Chiappa
2017-11-28 0:23 ` Dave Horsfall
2017-11-25 17:34 Doug McIlroy
2017-11-25 14:24 Noel Chiappa
2017-11-25 15:58 ` Lawrence Stewart
2017-11-25 16:10 ` Lars Brinkhoff
2017-11-25 19:59 ` Steve Simon
2017-11-25 21:59 ` Bakul Shah
2017-11-25 3:14 Doug McIlroy
2017-11-25 4:16 ` Jon Steinhart
2017-11-25 5:17 ` ron minnich
2017-11-25 14:23 ` Ralph Corderoy
2017-11-24 21:43 Noel Chiappa
2017-11-24 21:50 ` Jon Steinhart
2017-11-25 21:55 ` William Cheswick
2017-11-25 23:15 ` Dave Horsfall
2017-11-24 22:20 ` Mike Markowski
2017-11-24 22:31 ` Dave Horsfall
2017-11-24 19:25 Will Senn
2017-11-24 19:28 ` Jon Steinhart
2017-11-27 14:50 ` Tony Finch
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