• Ard Biesheuvel's avatar
    efi/zboot: Add BSS padding before compression · bca2f3a9
    Ard Biesheuvel authored
    We don't really care about the size of the decompressed image - what
    matters is how much space needs to be allocated for the image to
    execute, and this includes space for BSS that is not part of the
    loadable image and so it is not accounted for in the decompressed size.
    
    So let's add some zero padding to the end of the image: this compresses
    well, and it ensures that BSS is accounted for, and as a bonus, it will
    be zeroed before launching the image.
    
    Since all architectures that implement support for EFI zboot carry this
    value in the header in the same location, we can just grab it from the
    binary that is being compressed.
    Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
    bca2f3a9
Makefile.zboot 2.65 KB