From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Subject: Re: Arbitrary Sandbox
Date: Sat, 18 Feb 2012 21:24:31 +0200
Date: 2012-02-18T21:24:31+02:00 [thread overview]
Message-ID: <9qac7gFk0nU1@mid.individual.net> (raw)
In-Reply-To: <wccobswc6ob.fsf@shell01.TheWorld.com>
On 12-02-18 20:55 , Robert A Duff wrote:
> "Dmitry A. Kazakov"<mailbox@dmitry-kazakov.de> writes:
>
>> I wonder what kind of architecture could require a safe implementation of
>> Ada, e.g. when private parts of packages and protected objects would be
>> mapped onto the memory physically inaccessible from public contexts.
...
> Why do work at run time that can be done at compile time?
> Implementing things in hardware doesn't magically make
> them free.
>
> Putting high-level support for higher-level languages in hardware
> has been tried a number of times, and it's always been a bad idea.
For some critical systems, having checks at more than one level is good.
I seem to remember that the Burroughs mainframe computers had rather
poor hardware-level protections. A buggy or malicious compiler could
generate code that had harmful effects that were not restricted to the
user running the code, if I remember correctly. A consequence was that
an ordinary user was not allowed to create a compiler; special
privileges were required to label a program as a "compiler" and thus let
it generate executable code.
I agree with Bob that high-level things like visibility do not benefit
from hardware support. But I wish hardware could detect erroneous
executions of Ada programs.
--
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
. @ .
next prev parent reply other threads:[~2012-02-18 19:25 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-09 23:47 Arbitrary Sandbox Rob Shea
2012-02-10 0:10 ` Rob Shea
2012-02-10 2:01 ` Tez
2012-02-10 2:21 ` Rob Shea
2012-02-10 2:47 ` Tez
2012-02-10 4:11 ` Shark8
2012-02-13 2:23 ` BrianG
2012-02-10 4:17 ` tmoran
2012-02-10 4:41 ` Rob Shea
2012-02-10 6:15 ` Jeffrey Carter
2012-02-10 6:18 ` Rob Shea
2012-02-10 19:39 ` Jeffrey Carter
2012-02-10 6:19 ` Thomas Løcke
2012-02-10 9:32 ` Rob Shea
2012-02-10 10:09 ` Thomas Løcke
2012-02-10 11:39 ` Ludovic Brenta
2012-02-10 12:05 ` Brian Drummond
2012-02-11 10:32 ` Maciej Sobczak
2012-02-11 11:39 ` Dmitry A. Kazakov
2012-02-11 21:15 ` Maciej Sobczak
2012-02-11 21:38 ` Dmitry A. Kazakov
2012-02-11 23:05 ` Rob Shea
2012-02-13 2:10 ` Tez
2012-02-13 9:08 ` Yannick Duchêne (Hibou57)
2012-02-13 16:28 ` Pascal Obry
2012-02-10 9:47 ` Georg Bauhaus
2012-02-10 11:45 ` Erich
2012-02-10 11:48 ` Ludovic Brenta
2012-02-11 6:11 ` Rob Shea
2012-02-12 2:10 ` Randy Brukardt
2012-02-12 8:40 ` björn lundin
2012-02-14 0:26 ` Shark8
2012-02-15 21:07 ` Randy Brukardt
2012-02-15 22:10 ` Yannick Duchêne (Hibou57)
2012-02-18 4:47 ` Shark8
2012-02-18 8:26 ` Dmitry A. Kazakov
2012-02-18 10:45 ` Yannick Duchêne (Hibou57)
2012-02-18 11:31 ` Dmitry A. Kazakov
2012-02-18 11:58 ` Niklas Holsti
2012-02-18 12:57 ` Yannick Duchêne (Hibou57)
2012-02-18 18:55 ` Robert A Duff
2012-02-18 19:24 ` Niklas Holsti [this message]
2012-02-18 20:06 ` tmoran
2012-02-18 21:53 ` Niklas Holsti
2012-02-18 22:58 ` Robert A Duff
2012-02-19 0:47 ` tmoran
2012-02-20 23:39 ` Robert A Duff
2012-02-21 3:29 ` tmoran
2012-02-21 17:17 ` tmoran
2012-02-21 21:03 ` Robert A Duff
2012-03-06 0:52 ` Randy Brukardt
2012-02-20 22:52 ` Adam Beneschan
2012-02-18 23:03 ` BrianG
2012-02-19 8:45 ` Dmitry A. Kazakov
2012-02-20 23:27 ` Robert A Duff
2012-02-21 8:36 ` Dmitry A. Kazakov
2012-02-21 9:59 ` Simon Wright
2012-02-21 10:59 ` Dmitry A. Kazakov
2012-02-21 17:25 ` Robert A Duff
2012-02-21 18:53 ` Dmitry A. Kazakov
2012-02-21 21:19 ` Robert A Duff
2012-02-22 8:24 ` Dmitry A. Kazakov
2012-02-21 21:25 ` Yannick Duchêne (Hibou57)
2012-02-22 8:26 ` Dmitry A. Kazakov
2012-02-21 8:47 ` Georg Bauhaus
2012-02-21 16:58 ` Robert A Duff
2012-03-06 1:06 ` Randy Brukardt
2012-03-07 5:43 ` Yannick Duchêne (Hibou57)
2012-03-07 13:05 ` Robert A Duff
2012-03-07 19:32 ` tmoran
2012-03-07 20:24 ` Dmitry A. Kazakov
2012-03-08 0:50 ` Robert A Duff
2012-03-08 1:50 ` tmoran
2012-03-08 11:01 ` Brian Drummond
2012-03-08 1:01 ` Shark8
2012-03-08 1:33 ` Randy Brukardt
2012-02-20 20:52 ` Tero Koskinen
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