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Peter Jones 9fcd221ef1 [fallback] Attempt to re-use existing entries when possible. 
Some firmwares seem to ignore our boot entries and put their fallback
entries back on top.  Right now that results in a lot of boot entries
for our stuff, a la https://bugzilla.redhat.com/show_bug.cgi?id=995834 .

Instead of that happening, if we simply find existing entries that match
the entry we would create and move them to the top of the boot order,
the machine will continue to operate in failure mode (which we can't
avoid), but at least we won't create thousands of extra entries.

Signed-off-by: Peter Jones <pjones@redhat.com>
2014-01-31 10:31:10 -05:00
Cryptlib allow 32-bit compilation with 64-bit compiler 2013-11-12 10:31:59 -05:00
include Fix path generation for Dhcpv4 bootloader. 2013-11-21 11:48:24 -05:00
lib Error check the right thing in get_variable_attr() when allocating. 2013-11-21 11:48:24 -05:00
.gitignore Add ident-like blobs to shim.efi for version checking. 2013-10-03 11:11:09 -04:00
cert.S Make vendor_cert/vendor_dbx actually replaceable by an external tool. 2013-10-01 14:03:16 -04:00
COPYRIGHT Add copyright file 2012-07-09 11:03:12 -04:00
crypt_blowfish.c MokManager: support blowfish-based crypt() hash 2013-09-26 11:58:01 -04:00
crypt_blowfish.h MokManager: support blowfish-based crypt() hash 2013-09-26 11:58:01 -04:00
elf_ia32_efi.lds Move embedded certificates to their own section. 2013-06-10 17:35:33 -04:00
elf_ia64_efi.lds Move embedded certificates to their own section. 2013-06-10 17:35:33 -04:00
elf_x86_64_efi.lds Move embedded certificates to their own section. 2013-06-10 17:35:33 -04:00
fallback.c [fallback] Attempt to re-use existing entries when possible. 2014-01-31 10:31:10 -05:00
make-certs Sign MokManager with a locally-generated key 2012-11-26 13:43:50 -05:00
Makefile allow 32-bit compilation with 64-bit compiler 2013-11-12 10:31:59 -05:00
MokManager.c Revert "additional bounds-checking on section sizes" 2013-10-23 10:50:36 -04:00
MokVars.txt Add support for disabling db for verification 2013-10-02 11:29:34 -04:00
netboot.c Lengths that might be -1 can't be unsigned, Peter. 2013-11-21 11:48:24 -05:00
netboot.h netboot.h: fix build error on 32-bit systems 2013-11-12 10:25:40 -05:00
PasswordCrypt.c Revert "additional bounds-checking on section sizes" 2013-10-23 10:50:36 -04:00
PasswordCrypt.h MokManager: support Tradition DES hash 2013-09-26 11:58:01 -04:00
README Add basic documentation 2012-07-28 00:42:43 -04:00
replacements.c Clarify meaning of insecure_mode 2013-11-19 10:20:34 -05:00
replacements.h Unhook system services as we exit. 2013-10-04 15:31:48 -04:00
shim.c Don't hook system services if shim has no built-in keys 2013-11-19 10:20:34 -05:00
shim.h Make SHIM_LOCK_GUID a first-class object with a symbol. 2013-09-23 10:40:49 -04:00
TODO Update for Josh's changes. 2013-10-02 13:33:52 -04:00
ucs2.h Add StrCSpn() 2013-04-30 09:46:22 -04:00
version.c.in Add ident-like blobs to shim.efi for version checking. 2013-10-03 11:11:09 -04:00
version.h Add ident-like blobs to shim.efi for version checking. 2013-10-03 11:11:09 -04:00

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 hex dump of the public certificate in cert.h
and build it with make.