linux-kernel - Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down

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Date:   Sat, 8 Apr 2017 05:28:15 +0200
From:   poma <pomidorabelisima@...il.com>
To:     Jiri Kosina <jikos@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     David Howells <dhowells@...hat.com>,
        Oliver Neukum <oneukum@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        linux-efi@...r.kernel.org, gnomes@...rguk.ukuu.org.uk,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        Joey Lee <JLee@...e.com>, matthew.garrett@...ula.com
Subject: Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down

On 06.04.2017 22:25, Jiri Kosina wrote:
> On Thu, 6 Apr 2017, Rafael J. Wysocki wrote:
> 
>>>>> Your swap partition may be located on an NVDIMM or be encrypted.
>>>>
>>>> An NVDIMM should be considered the same as any other persistent storage.
>>>>
>>>> It may be encrypted, but where's the key stored, how easy is it to retrieve
>>>> and does the swapout code know this?
>>>>
>>>>> Isn't this a bit overly drastic?
>>>>
>>>> Perhaps, but if it's on disk and it's not encrypted, then maybe not.
>>>
>>> Right.
>>>
>>> Swap encryption is not mandatory and I'm not sure how the hibernate
>>> code can verify whether or not it is in use.
>>
>> BTW, SUSE has patches adding secure boot support to the hibernate code
>> and Jiri promised me to post them last year even. :-)
> 
> Oh, thanks for a friendly ping :) Adding Joey Lee to CC.
> 

Rafael J., are you talking about HIBERNATE_VERIFICATION ?

Ref.
https://github.com/joeyli/linux-s4sign/commits/s4sign-hmac-v2-v4.2-rc8
https://lkml.org/lkml/2015/8/11/47
https://bugzilla.redhat.com/show_bug.cgi?id=1330335