Re: [PATCH] Modify UEFI anti-bricking code

[joeyli]

æ äï2013-06-05 æ 16:08 +0000ïMatthew Garrett æåï
> On Wed, 2013-06-05 at 16:59 +0100, Matt Fleming wrote:
> 
> > +	/* clean DUMMY object */
> > +	efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID, 0, 0, NULL);
> 
> Hm. Actually, is that going to work? From the spec:
> 

The patch I tested on OVMF, it can delete DUMMY object when system boot.

> If a preexisting variable is rewritten with different attributes,
> SetVariable()shall not modify the variable and shall return
> EFI_INVALID_PARAMETER. 
> 
> So I think we probably need to fix the attributes to NV|RT|BS for both
> this call and the one in query_variable_store. We should probably also
> only do the workaround if the NV bit is set in the original query.
> 
> -- 
> Matthew Garrett | mjg59@xxxxxxxxxxxxx

Yes, I think that more safe for fix the attributes.


Thanks a lot!
Joey Lee



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