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:	Wed, 06 May 2015 10:37:01 +0800
From:	"Li, ZhenHua" <zhen-hual@...com>
To:	Dave Young <dyoung@...hat.com>
CC:	Joerg Roedel <joro@...tes.org>, Baoquan He <bhe@...hat.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, "Li, ZhenHua" <zhen-hual@...com>
Subject: Re: [PATCH v10 0/10] iommu/vt-d: Fix intel vt-d faults in kdump kernel

Dave,
This patchset will only write root tables in old kernel,  if it is 
corrupted, faults will also happen in old kernel, and hardware would 
mark it. So things will not go worse..

Thanks
Zhenhua
On 05/06/2015 09:51 AM, Dave Young wrote:
> On 05/05/15 at 05:31pm, Joerg Roedel wrote:
>> On Tue, May 05, 2015 at 02:14:23PM +0800, Dave Young wrote:
>>> 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.
>>
>> I still fail to see how things can get more worse than they already are
>> by reusing the old data (we just reuse it, we do not modify anything
>
> DMA write will modify system ram, if the old data is corrupted  it is possible
> that DMA operation modify wrong ram regions because of wrong mapping.
> Am I missing something and is it not possible?
>
> 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/