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In its current form, Region.PadBuffer() fills every second byte with 0x20, the default separator string of Python's string.join(): https://docs.python.org/2/library/string.html#string.join This corrupts some firmware because (a) 0x20 never corresponds to any ErasePolarity, (b) the PadData produced are actually longer than Size. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Liming Gao <liming.gao@intel.com> Cc: Yonghong Zhu <yonghong.zhu@intel.com> Reported-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Fixes: bd907fb6386560e621112beca7b7d381d0003967 Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>