From: Andreas Schwab <schwab@suse.de>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: "Bjorn Helgaas" <bjorn.helgaas@hp.com>,
<linux-ia64@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] prevent "dd if=/dev/mem" crash
Date: Sat, 18 Oct 2003 00:40:48 +0200 [thread overview]
Message-ID: <jellrjfpxr.fsf@sykes.suse.de> (raw)
In-Reply-To: <B8E391BBE9FE384DAA4C5C003888BE6F0F367D@scsmsx401.sc.intel.com> (Tony Luck's message of "Fri, 17 Oct 2003 15:19:49 -0700")
"Luck, Tony" <tony.luck@intel.com> writes:
>> 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?
EIO would probably fit better.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 Nürnberg
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2003-10-17 22:42 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-17 22:19 Luck, Tony
2003-10-17 22:40 ` Andreas Schwab [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-10-17 22:10 Bjorn Helgaas
2003-10-17 22:23 ` Matt Mackall
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 19:01 ` William Lee Irwin III
2003-10-20 15:17 ` Bjorn Helgaas
2003-10-20 18:48 ` David Mosberger
2003-10-20 17:42 ` Bjorn Helgaas
2003-10-23 21:05 ` Bjorn Helgaas
2003-10-19 18:17 ` Pavel Machek
2003-10-23 8:33 ` Martin Pool
2003-10-23 9:31 ` Zoltan Menyhart
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