mirror of
https://git.proxmox.com/git/efi-boot-shim
synced 2025-07-27 11:03:07 +00:00
08ede98fbc
Nick Clifton wrote to me and explained:
Subject: SHIM - objcopy version check broken by RHEL 7.3 binutils
Hi Peter,
We (the tools group) have run across a small problem with the shim
package for RHEL 7.3, whilst testing out a new version of the
binutils. It complains that it needs a version of objcopy that is
>= 2.23, despite the fact that the version is actually 2.25.1.
I tracked the problem down to an extraneous space at the end of the
version string being produced by objcopy:
"GNU objcopy version 2.25.1-8.el7 "
The Makefile in the shim package uses this rule to test the version of
objcopy:
OBJCOPY_GTE224 = $(shell expr `$(OBJCOPY) --version |grep ^"GNU objcopy" | sed 's/^.* //g' | cut -f1-2 -d.` \>= 2.24)
But, because of that extra space, the sed expression clips the entire
line and so the test fails.
The extra space is there because normally the version number would be
followed by a date. For example:
"GNU objcopy version 2.23.52.0.1-56.el7 20130226"
So in this case the sed will extract the date, not the version number,
but the test will still pass.
I could fix the binutils to remove the space, although it would be a
bit messy and it would not fix the problem when a date is appended to
the version number. Instead, I would like to propose a small patch to
the shim Makefile. If you change the line to:
OBJCOPY_GTE224 = $(shell expr `$(OBJCOPY) --version |grep ^"GNU objcopy" | sed 's/^.version //g' | cut -f1-2 -d.` \>= 2.24)
then the test will work as intended, with or without an extra space at
the end of the version and with or without a date appended.
Would it be possible to have this change added to the shim package ?
Cheers
Signed-off-by: Peter Jones <pjones@redhat.com>
|
||
|---|---|---|
| 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 | ||
| hexdump.h | ||
| 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 | ||
| tpm.c | ||
| tpm.h | ||
| 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".