Messages in this thread | | | Date | Mon, 28 Jan 2013 10:38:27 +0800 | From | Lingzhu Xiang <> | Subject | Re: [RFC] efivars write(2) races |
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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
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