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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 18:09:17 +0200
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  • Cc: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 13 May 2025 16:09:32 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 13.05.2025 17:59, Kevin Lampis wrote:
> On Tue, May 13, 2025 at 3:32 PM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>>
>> Well, it's easily possible to catch that error without any extra parsing.
> 
> If `lockdown` is not the first argument then we should print a warning
> to tell the user that Xen may have already parsed some insecure
> arguments and lockdown mode will not be effective.
> 
> What would be a good way to check if lockdown is or isn't the first
> argument? I am not sure.

It'll be a little hack-ish, I suppose (yet the option is quite special,
after all), but I can see various options. For example, have the resulting
variable not be boolean, and OR in a separate flag after parsing the first
option. Then warn if the flag is clear after all options were parsed.

Jan



 


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