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UEFI shim loader
C C++ Other
Latest commit e22a7b5 Linn Crosetto committed with vathpela Fix recursive reference for RELEASE …
Building 0.9 with GNU Make 4.0 fails with the following error: Makefile:4: *** Recursive variable 'RELEASE' references itself (eventually). Stop. Change RELEASE to simply-expanded. Signed-off-by: Linn Crosetto <email@example.com>
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. shim will also install a protocol which permits the second-stage bootloader to perform similar binary validation. This protocol has a GUID as described in the shim.h header file and provides a single entry point. On 64-bit systems this entry point expects to be called with SysV ABI rather than MSABI, and so calls to it should not be wrapped. To use shim, simply place a DER-encoded public certificate in a file such as pub.cer and build with "make VENDOR_CERT_FILE=pub.cer".