From: ebiederm@xmission.com (Eric W. Biederman)
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andrew Morton <akpm@osdl.org>,
suparna@in.ibm.com, fastboot@osdl.org, mbligh@aracnet.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
jbarnes@engr.sgi.com
Subject: Re: [Fastboot] Re: Announce: dumpfs v0.01 - common RAS output API
Date: 28 Jul 2004 19:05:36 -0600 [thread overview]
Message-ID: <m18yd362sf.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <1091055311.31923.3.camel@localhost.localdomain>
Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
> On Iau, 2004-07-29 at 00:17, Eric W. Biederman wrote:
> > What is your concern with stopping DMA?
> > - Not smashing the recovery routine.
> > - Getting a corrupted core dump because of on-going DMA?
>
> Completely random happenings occurring when they are trivial to avoid.
> Given all the worries about SHA signed in kernel standalone objects I
> find it farcical that the same people don't even care about ensuring
> something isnt DMAing over their dump partition description.
I was asking so I could give a better answer.
As far as I can tell the long term solution is to simply run the
dumper from memory that reserved in the kernel that called panic().
At that point you might get a corrupt DUMP. But it is extremely
unlikely any DMA transactions will touch your reserved memory.
Only the most buggy drivers or hardware will be running
DMA to the invalid addresses. At which point there is
very little you can do in any event.
Eric
next prev parent reply other threads:[~2004-07-29 1:06 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-22 16:19 Announce: dumpfs v0.01 - common RAS output API Keith Owens
2004-07-26 6:57 ` Andrew Morton
2004-07-28 1:53 ` Eric W. Biederman
2004-07-28 10:54 ` Suparna Bhattacharya
2004-07-28 10:46 ` [Fastboot] " Alan Cox
2004-07-28 14:38 ` Martin J. Bligh
2004-07-28 14:06 ` Alan Cox
2004-07-28 15:21 ` Martin J. Bligh
2004-07-28 15:56 ` Eric W. Biederman
2004-07-28 17:09 ` Andrea Arcangeli
2004-07-28 16:05 ` Eric W. Biederman
2004-07-28 15:42 ` Eric W. Biederman
2004-07-28 15:12 ` Eric W. Biederman
2004-07-28 15:23 ` Martin J. Bligh
2004-07-28 15:53 ` Eric W. Biederman
2004-07-28 16:03 ` Jesse Barnes
2004-07-28 18:00 ` Eric W. Biederman
2004-07-28 18:06 ` Jesse Barnes
2004-07-28 19:42 ` Martin J. Bligh
2004-07-28 19:56 ` [Fastboot] " Alan Cox
2004-07-28 19:44 ` Andrew Morton
2004-07-28 23:11 ` [Fastboot] " Eric W. Biederman
2004-07-28 22:53 ` Alan Cox
2004-07-29 1:12 ` Eric W. Biederman
2004-07-29 14:00 ` Alan Cox
2004-07-29 15:47 ` Eric W. Biederman
2004-07-28 18:21 ` Alan Cox
2004-07-28 19:23 ` Martin J. Bligh
2004-07-28 20:28 ` [Fastboot] " Eric W. Biederman
2004-07-28 20:33 ` Andrew Morton
2004-07-28 19:59 ` Alan Cox
2004-07-28 22:42 ` Andrew Morton
2004-07-28 22:44 ` Jesse Barnes
2004-07-28 23:17 ` Eric W. Biederman
2004-07-28 22:55 ` Alan Cox
2004-07-29 0:22 ` Andrew Morton
2004-07-29 13:57 ` Alan Cox
2004-07-29 18:17 ` Andrew Morton
2004-07-29 21:20 ` Alan Cox
2004-07-29 22:30 ` Gerrit Huizenga
2004-07-30 0:04 ` Eric W. Biederman
2004-07-29 23:25 ` Alan Cox
2004-07-30 4:07 ` Eric W. Biederman
2004-07-30 12:38 ` Gerrit Huizenga
2004-07-31 13:52 ` Matthias Urlichs
2004-07-30 15:24 ` Olivier Galibert
2004-07-29 1:05 ` Eric W. Biederman [this message]
2004-07-29 14:12 ` Martin J. Bligh
2004-07-28 23:44 ` Andrew Morton
2004-07-29 0:58 ` Eric W. Biederman
2004-07-29 1:09 ` Andrew Morton
2004-07-29 1:56 ` Eric W. Biederman
2004-07-29 14:18 ` Martin J. Bligh
2004-07-29 16:01 ` Eric W. Biederman
2004-07-29 16:19 ` Eric W. Biederman
2004-07-29 14:08 ` Martin J. Bligh
2004-07-29 15:52 ` Eric W. Biederman
2004-07-29 16:13 ` Martin J. Bligh
2004-07-29 17:12 ` Matthias Urlichs
-- strict thread matches above, loose matches on Subject: below --
2004-07-30 15:02 Manfred Spraul
2004-07-30 14:42 ` Alan Cox
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