Re: [tboot-devel] Crash/system reset with linux 4.4

[Jan S. <ja...@sc...>]

Newest compiled from git current (that is about 1 month ago, haven't touched that since).
I hit other problems, but nothing that min_ram would fix.
But that was Ubuntu distribution kernel - no idea what Qubes kernel has inside in terms of patches etc...
I can maybe try Qubes kernel on Monday for you, to see if it boots on my hw and with my tboot.
Tboot 1.8.2 is old and there are vulnerabilities that make it worthless in terms of security anyway (unless they backported the patches of course).


Jan

> On 05 Aug 2016, at 20:53, Chris Laprise <ta...@op...> wrote:
> 
> Hi Jan,
> 
> 
> Which version of tboot are you using?
> 
> 
> Chris
> 
> 
> On 08/03/2016 11:28 AM, Jan Schermer wrote:
>> Just FYI - I'm using tboot with 4.4 kernels (Ubuntu 16.04) and I haven't had this issue
>> 
>> Jan
>> 
>>> On 03 Aug 2016, at 05:35, Sun, Ning <nin...@in...> wrote:
>>> 
>>> There is an explanation in README of tboot source code about 'min_ram' parameter: https://sourceforge.net/p/tboot/code/ci/default/tree/.
>>> To identify this issue as a generic or a specific one with Qubes OS, needs to run Qubes OS  and tboot on several different platforms from different vendors if possible.
>>> There are new releases of tboot available since tboot 1.8.2, to help verify if tboot has a bug relevant to this crash/reset.
>>> 
>>> -ning
>>> 
>>> -----Original Message-----
>>> From: Chris Laprise [mailto:ta...@op...]
>>> Sent: Tuesday, August 02, 2016 5:54 PM
>>> To: tbo...@li...
>>> Subject: [tboot-devel] Crash/system reset with linux 4.4
>>> 
>>> Hello,
>>> 
>>> 
>>> On Qubes OS 3.2rc2, a tboot-based boot sequence will fail with a system reset unless the 'min_ram=0x2000000' parameter is specified in grub. See Qubes issue #2155:
>>> 
>>> https://github.com/QubesOS/qubes-issues/issues/2155
>>> 
>>> Currently, Qubes uses tboot version 1.8.2 from the Fedora 23 repository.
>>> The other relevant components are Linux kernel 4.4.14 and Xen 4.6.1. If Linux is downgraded to 4.2 then the system is able to boot without crashing.
>>> 
>>> This parameter would normally be used to rectify a milder condition where the system boots with less memory available than it should. Using it to avoid a catastrophic crash does not seem right, so I'd like to ask what is the best course of action from the tboot devs: Is this a bug in tboot or Linux? Should Qubes devs consider using 'min_ram' for all tboot installations? Would it be worth the trouble to try upgrading tboot to the current version? And if so, are signatures available for the tboot code?
>>> 
>>> Chris
>>> 
>>> 
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>> 
>