於 五，2013-03-01 於 17:31 +0800，Lingzhu Xiang 提到： > On 03/01/2013 11:20 AM, Lee, Chun-Yi wrote: > > From: Michael Schroeder <mls@xxxxxxxx> > > > > On HP z220 system (firmware version 1.54), some EFI variables are incorrectly > > named : > > > > ls -d /sys/firmware/efi/vars/*8be4d* | grep -v -- -8be returns > > /sys/firmware/efi/vars/dbxDefault-pport8be4df61-93ca-11d2-aa0d-00e098032b8c > > /sys/firmware/efi/vars/KEKDefault-pport8be4df61-93ca-11d2-aa0d-00e098032b8c > > /sys/firmware/efi/vars/SecureBoot-pport8be4df61-93ca-11d2-aa0d-00e098032b8c > > /sys/firmware/efi/vars/SetupMode-Information8be4df61-93ca-11d2-aa0d-00e098032b8c > > > > That causes by the following statement in efivar_create_sysfs_entry function: > > > > *(short_name + strlen(short_name)) = '-'; > > efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); > > > > The trailing \0 is overwritten with '-', but the next char doesn't seem to be a \0 > > as well for HP. So, the second strlen return the point of next '\0', causes there > > have garbage string attached before GUID. > > > > Tested on On HP z220. > > So short_name has trailing garbage, or rather, variable_name_size > is larger than variable_name actually is, wouldn't new_efivar->var.VariableName > also gets filled with trailing garbage? > > In efivar_store_raw the VariableName's trailing garbage can cause > problem for comparison. You might want to also cover that or fix > variable_name_size. > > > Lingzhu Xiang > Yes, it's possible! I will add patch for print more debug messages to bug reporter for check it. Thanks for your review! Joey Lee -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
