From: "Luck, Tony" <tony.luck@intel.com>
To: linux-ia64@vger.kernel.org
Subject: RE: [RFC] prevent "dd if=/dev/mem" crash
Date: Fri, 17 Oct 2003 22:19:49 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106642941215349@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-106642876514553@msgid-missing>
> I expect there are probably different opinions about the idea
> that "dd if=/dev/mem" exits without doing anything. Sparc and
> 68K have nearby code that bit-buckets writes and returns zeroes
> for reads of page zero. We could do that, too, but it seems like
> kind of a hack, and holes on ia64 can be BIG (on the order of
> 256GB for one box).
Filling in the holes does seem like a bad idea, but so does returning
EOF when you hit a hole (which is what I think your patch is doing).
Would ENODEV be better?
-Tony
next prev parent reply other threads:[~2003-10-17 22:19 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-17 22:10 [RFC] prevent "dd if=/dev/mem" crash Bjorn Helgaas
2003-10-17 22:19 ` Luck, Tony [this message]
2003-10-17 22:23 ` Matt Mackall
2003-10-17 22:40 ` Andreas Schwab
2003-10-17 22:50 ` Andrew Morton
2003-10-17 23:25 ` Bjorn Helgaas
2003-10-17 23:55 ` Andrew Morton
2003-10-18 0:15 ` William Lee Irwin III
2003-10-18 0:21 ` David Mosberger
2003-10-18 0:49 ` Andrew Morton
2003-10-18 1:31 ` Matt Chapman
2003-10-18 1:41 ` Andrew Morton
2003-10-18 1:48 ` David Mosberger
2003-10-18 2:01 ` Andrew Morton
2003-10-18 2:01 ` Matt Chapman
2003-10-19 11:25 ` Eric W. Biederman
2003-10-19 18:17 ` Pavel Machek
2003-10-19 19:01 ` William Lee Irwin III
2003-10-20 15:17 ` Bjorn Helgaas
2003-10-20 17:42 ` Bjorn Helgaas
2003-10-20 18:48 ` David Mosberger
2003-10-23 8:33 ` Martin Pool
2003-10-23 9:31 ` Zoltan Menyhart
2003-10-23 21:05 ` Bjorn Helgaas
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