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Building a secure boot chain to userland

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Building a secure boot chain to userland
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47
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CC Attribution 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Secure boot as it currently exists in desktop Linux distributions is sufficient to verify that the bootloader and kernel have not been tampered with, but generally does nothing to ensure that userland is secure. How can we fix that?