From: Ralf Baechle <ralf@linux-mips.org>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: Michael Uhler <uhler@mips.com>,
"Finney, Steve" <Steve.Finney@spirentcom.com>,
linux-mips@linux-mips.org
Subject: Re: 64 bit operations w/32 bit kernel
Date: Wed, 1 Oct 2003 18:24:20 +0200 [thread overview]
Message-ID: <20031001162420.GA28892@linux-mips.org> (raw)
In-Reply-To: <Pine.GSO.3.96.1031001055849.20371C-100000@delta.ds2.pg.gda.pl>
On Wed, Oct 01, 2003 at 06:26:02AM +0200, Maciej W. Rozycki wrote:
> > was never intended to run real 32-bit programs with 64-bit ops enabled,
> > and I would strongly urge you not to do this now.
>
> After a bit of thinking, I consider this not to be a real problem. Apart
> from the kernel interface, which sanitizes values passed, the rest is pure
> userland, where allowing undefined operation with 64-bit opcodes cannot
> really hurt. Of course running a buggy or malicious program may lead to
> bad results or loss of data, but it'll be limited to the user responsible
> for running such software and the root user by definition has to know what
> he is doing and specifically he is responsible for not running untrusted
> software on critical systems.
>
> That said, I don't really have a strong preference either way -- it just
> doesn't seem to be worth the hassle for me to explicitly defend against
> such a marginal case. Although it may be good to try validating this
> assumption with `crashme'.
It's a while since this last has been done and all bugs showing up were
fixed ...
Ralf
next prev parent reply other threads:[~2003-10-01 16:24 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-29 17:31 64 bit operations w/32 bit kernel Finney, Steve
2003-09-29 17:31 ` Finney, Steve
2003-09-29 19:01 ` Michael Uhler
2003-09-30 14:49 ` Kip Walker
2003-09-30 16:00 ` Ralf Baechle
2003-09-30 18:04 ` Maciej W. Rozycki
2003-09-30 18:47 ` Ralf Baechle
2003-10-01 3:58 ` Maciej W. Rozycki
2003-09-30 18:29 ` Michael Uhler
2003-09-30 19:10 ` Maciej W. Rozycki
2003-09-30 19:27 ` Michael Uhler
2003-10-01 4:26 ` Maciej W. Rozycki
2003-10-01 16:24 ` Ralf Baechle [this message]
2003-09-30 19:48 ` Ralf Baechle
-- strict thread matches above, loose matches on Subject: below --
2003-09-30 19:23 Finney, Steve
2003-09-30 19:23 ` Finney, Steve
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