linux-kernel - Re: [PATCH v10 0/10] iommu/vt-d: Fix intel vt-d faults in kdump kernel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 5 May 2015 14:14:23 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Baoquan He <bhe@...hat.com>, "Li, ZhenHua" <zhen-hual@...com>,
	dwmw2@...radead.org, indou.takao@...fujitsu.com, vgoyal@...hat.com,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, kexec@...ts.infradead.org,
	alex.williamson@...hat.com, ddutile@...hat.com,
	ishii.hironobu@...fujitsu.com, bhelgaas@...gle.com,
	doug.hatch@...com, jerry.hoemann@...com, tom.vaden@...com,
	li.zhang6@...com, lisa.mitchell@...com, billsumnerlinux@...il.com,
	rwright@...com
Subject: Re: [PATCH v10 0/10] iommu/vt-d: Fix intel vt-d faults in kdump
 kernel

On 05/04/15 at 06:23pm, Joerg Roedel wrote:
> On Fri, Apr 24, 2015 at 04:49:57PM +0800, Dave Young wrote:
> > I'm more than happy to see this issue can be fixed in the patchset, I
> > do not agree to add the code there with such problems. OTOH, for now
> > seems there's no way to fix it.
> 
> And that's the point. We discuss this issue and possible solutions for
> years by now, and what ZhenHua implemented is what we agreed to be the
> best-effort on what we can do in the kdump case with IOMMU enabled.
> 
> Of course there are still failure scenarios left, but that is not
> different from systems without any IOMMU.

The failure is nothing different, but as I said in another reply the
difference is we could use corrupted data to possiblly cause more failure. 

Thanks
Dave
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/