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SubjectRe: [RFC] efivars write(2) races
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On Mon, 2013-01-28 at 10:38 +0800, Lingzhu Xiang wrote:
> On 01/25/2013 09:18 PM, Matt Fleming wrote:
> >> 4. EFI_VARIABLE_APPEND_WRITE with EFI_OUT_OF_RESOURCES truncates size but you
> >> can still read its content.
> >
> > I'm not sure what you mean by this. Could you please explain?
>
> Oops, this one is incorrect. I was testing EFI_VARIABLE_APPEND_WRITE
> using this:
>
> printf "\x47\x00\x00\x00\x00" >test-1-$guid
>
> So it truncates the file before writing, but efivarfs figures out the right
> size afterwards. The size remains zero if the write fails.
>
> I should be using this for appending:
>
> printf "\x47\x00\x00\x00\x00" >>test-1-$guid

Does this mean that these two test cases work as expected?



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