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Shim
Jul 20, 2023
UEFI Secure Boot shim loader
shim is a trivial EFI application that, when run, attempts to open and execute another application. It will initially attempt to do this via the standard EFI LoadImage and StartImage calls. If these fail because secure boot is enabled and the binary is not signed with an appropriate key, for instance it will then validate the binary against a built-in certificate. If this succeeds and if the binary or signing key are not blacklisted then shim will relocate and execute the binary.
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