Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
UEFI shim loader
C C++ Other

Specify the gnu89 standard

According to the gcc5 porting guideline (*), gcc5 defaults to
-std=gnu11 instead of -std=gnu89. Append -std=gnu89 to CFLAGS
to avoid the potential problems.

(*) https://gcc.gnu.org/gcc-5/porting_to.html

Based on the patch from Cristian Rodriguez <crrodriguez@opensuse.org>

Signed-off-by: Gary Ching-Pang Lin <glin@suse.com>
latest commit 16f8f0087a
@lcp lcp authored vathpela committed
Failed to load latest commit information.
Cryptlib Specify the gnu89 standard
include Fix console_print_box*() parameters.
lib More incorrect unsigned vs signed fixups from yours truly.
.gitignore Add ident-like blobs to shim.efi for version checking.
COPYRIGHT Add copyright file
Makefile Specify the gnu89 standard
MokManager.c MokManager: Nerf SHA-1 again for actual hashes and signatures.
MokVars.txt Add support for disabling db for verification
PasswordCrypt.c additional bounds-checking on section sizes
PasswordCrypt.h MokManager: support Tradition DES hash
README Replace build instructions in README with something not completely wr…
TODO Update for Josh's changes.
cert.S Add support for 32-bit ARM
crypt_blowfish.c MokManager: support blowfish-based crypt() hash
crypt_blowfish.h MokManager: support blowfish-based crypt() hash
elf_aarch64_efi.lds Make sure our build-id notes wind up at a reasonable place.
elf_arm_efi.lds Make sure our build-id notes wind up at a reasonable place.
elf_ia32_efi.lds Make sure our build-id notes wind up at a reasonable place.
elf_ia64_efi.lds Make sure our build-id notes wind up at a reasonable place.
elf_x86_64_efi.lds Make sure our build-id notes wind up at a reasonable place.
fallback.c Improve our debuginfo path print
make-certs Sign MokManager with a locally-generated key
netboot.c Correctly reject bad tftp addresses earlier, rather than later.
netboot.h netboot.h: fix build error on 32-bit systems
replacements.c Ensure that apps launched by shim get correct BS->Exit() behavior
replacements.h Ensure that apps launched by shim get correct BS->Exit() behavior
shim.c Improve our debuginfo path print
shim.h Ensure that apps launched by shim get correct BS->Exit() behavior
testplan.txt Another testplan error.
ucs2.h Add StrCSpn()
version.c.in Add ident-like blobs to shim.efi for version checking.
version.h Add ident-like blobs to shim.efi for version checking.

README

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".
Something went wrong with that request. Please try again.