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https://git.proxmox.com/git/efi-boot-shim
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750584c207
This is mostly based on a patch (https://github.com/mjg59/shim/issues/30) from https://github.com/TBOpen , which refactors our __LP64__ tests to be tests of the header magic instead. I've simplified things by using what we've pre-loaded into "context" and making some helper functions so the conditionals in most of the code say what they do, instead of how they work. Note that we're only allowing that from in_protocol's loader - that is, we'll let 64-bit grub load a 32-bit kernel or 32-bit grub load a 64-bit kernel, but 32-bit shim isn't loading a 64-bit grub. Signed-off-by: Peter Jones <pjones@redhat.com> |
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|---|---|---|
| Cryptlib | ||
| include | ||
| lib | ||
| .gitignore | ||
| cert.S | ||
| COPYRIGHT | ||
| crypt_blowfish.c | ||
| crypt_blowfish.h | ||
| elf_aarch64_efi.lds | ||
| elf_arm_efi.lds | ||
| elf_ia32_efi.lds | ||
| elf_ia64_efi.lds | ||
| elf_x86_64_efi.lds | ||
| fallback.c | ||
| make-certs | ||
| Makefile | ||
| MokManager.c | ||
| MokVars.txt | ||
| netboot.c | ||
| netboot.h | ||
| PasswordCrypt.c | ||
| PasswordCrypt.h | ||
| README | ||
| replacements.c | ||
| replacements.h | ||
| shim.c | ||
| shim.h | ||
| testplan.txt | ||
| TODO | ||
| ucs2.h | ||
| version.c.in | ||
| version.h | ||
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".