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Re: [PATCH 3/4] Add lockdown mode
- To: Kevin Lampis <kevin.lampis@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 13 May 2025 09:00:12 +0200
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- Cc: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 13 May 2025 07:00:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.05.2025 21:51, Kevin Lampis wrote:
> On Mon, May 12, 2025 at 11:39 AM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>>
>> I can't spot the effect the comment mentions anywhere in this patch. Is the
>> description perhaps lacking some detail? It's rather odd after all to see ...
>>
>> ... such custom token splitting ahead of normal command line handling.
>
> If the UEFI firmware reports that secure boot mode is enabled then Xen
> lockdown mode will always be enabled.
>
> But we also have a command line argument to enable lockdown mode without
> secure
> boot. This is the thing that lockdown_init() is looking for.
>
> It is important to know if we are in lockdown mode or not before parsing any
> other arguments. Otherwise there will be a race between parsing potentially
> unsafe arguments and finding the lockdown enable argument.
Well, there is an alternative: Require the lockdown argument to be absolutely
first. (There are further alternatives, but likely less usable.)
Jan
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