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Message-ID: <51073429.10503@redhat.com> Date: Tue, 29 Jan 2013 10:30:01 +0800 From: Lingzhu Xiang <lxiang@...hat.com> To: Matt Fleming <matt.fleming@...el.com> CC: Al Viro <viro@...IV.linux.org.uk>, linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org, Jeremy Kerr <jeremy.kerr@...onical.com> Subject: Re: [RFC] efivars write(2) races On 01/28/2013 08:38 PM, Matt Fleming wrote: > 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? Mostly yes. printf "\x47\x00\x00\x00\x00" >test-1-$guid still shows unexpected truncate behavior. But this is the same one already noted previously (truncate doesn't actually work). -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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