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Re: [PATCH v2 3/3] Disallow most command-line options when lockdown mode is enabled
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 2 Jun 2025 16:22:06 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, Kevin Lampis <kevin.lampis@xxxxxxxxx>
- Delivery-date: Mon, 02 Jun 2025 14:22:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.06.2025 16:16, Marek Marczykowski-Górecki wrote:
> On Mon, Jun 02, 2025 at 02:46:56PM +0100, Kevin Lampis wrote:
>> --- a/xen/common/lockdown.c
>> +++ b/xen/common/lockdown.c
>> @@ -35,7 +35,7 @@ static int __init parse_lockdown_opt(const char *s)
>>
>> return 0;
>> }
>> -custom_param("lockdown", parse_lockdown_opt);
>> +custom_secure_param("lockdown", parse_lockdown_opt);
>
> Is that really a good idea? It means `lockdown=yes lockdown=no` would
> still disable it in the end. This may matter more if for example the
> `lockdown=yes` part is in the built-in cmdline (possibly with other
> integrity protection than UEFI SB).
But having a way to override an earlier "lockdown" by "lockdown=no" is
intended? E.g. when your xen.cfg has the former, but you don't really
want that (for, say, an experiment).
Jan
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