Hi James,
In Linux 4.19, a new LSM hook named security_kernel_load_data was
upstreamed, allowing LSMs and IMA to prevent the kexec_load
syscall. Different signature verification methods exist for verifying
the kexec'ed kernel image. This pull request adds additional support
in IMA to prevent loading unsigned kernel images via the kexec_load
syscall, independently of the IMA policy rules, based on the runtime
"secure boot" flag. An initial IMA kselftest is included.
In addition, this pull request defines a new, separate keyring named
".platform" for storing the preboot/firmware keys needed for verifying
the kexec'ed kernel image's signature and includes the associated IMA
kexec usage of the ".platform" keyring.
(David Howell's and Josh Boyer's patches for reading the
preboot/firmware keys, which were previously posted for a different
use case scenario, are included here.)
Mimi
The following changes since commit 26b76320a8a550472bbb8f42257df83fcb8d8df6:
Merge tag 'v4.20-rc2' into next-general (2018-11-12 09:07:41 -0800)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git next-integrity
for you to fetch changes up to eed9de3b4f47114f440980203ca27c5fab70f529:
ima: Use inode_is_open_for_write (2018-12-12 22:09:34 -0500)
----------------------------------------------------------------
Dave Howells (2):
efi: Add EFI signature data types
efi: Add an EFI signature blob parser
Eric Richter (1):
x86/ima: define arch_get_ima_policy() for x86
Josh Boyer (2):
efi: Import certificates from UEFI Secure Boot
efi: Allow the "db" UEFI variable to be suppressed
Mimi Zohar (4):
integrity: support new struct public_key_signature encoding field
x86/ima: retry detecting secure boot mode
ima: don't measure/appraise files on efivarfs
selftests/ima: kexec_load syscall test
Nayna Jain (7):
x86/ima: define arch_ima_get_secureboot
ima: prevent kexec_load syscall based on runtime secureboot flag
ima: refactor ima_init_policy()
ima: add support for arch specific policies
integrity: Define a trusted platform keyring
integrity: Load certs to the platform keyring
ima: Support platform keyring for kernel appraisal
Nikolay Borisov (1):
ima: Use inode_is_open_for_write
Stefan Berger (1):
docs: Extend trusted keys documentation for TPM 2.0
Documentation/security/keys/trusted-encrypted.rst | 31 +++-
arch/x86/kernel/Makefile | 4 +
arch/x86/kernel/ima_arch.c | 75 ++++++++
include/linux/efi.h | 34 ++++
include/linux/ima.h | 15 ++
security/integrity/Kconfig | 11 ++
security/integrity/Makefile | 5 +
security/integrity/digsig.c | 110 ++++++++----
security/integrity/digsig_asymmetric.c | 1 +
security/integrity/ima/Kconfig | 10 +-
security/integrity/ima/ima_appraise.c | 14 +-
security/integrity/ima/ima_main.c | 21 ++-
security/integrity/ima/ima_policy.c | 171 +++++++++++++-----
security/integrity/integrity.h | 23 ++-
security/integrity/platform_certs/efi_parser.c | 108 ++++++++++++
security/integrity/platform_certs/load_uefi.c | 194 +++++++++++++++++++++
.../integrity/platform_certs/platform_keyring.c | 58 ++++++
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/ima/Makefile | 11 ++
tools/testing/selftests/ima/config | 4 +
tools/testing/selftests/ima/test_kexec_load.sh | 54 ++++++
21 files changed, 863 insertions(+), 92 deletions(-)
create mode 100644 arch/x86/kernel/ima_arch.c
create mode 100644 security/integrity/platform_certs/efi_parser.c
create mode 100644 security/integrity/platform_certs/load_uefi.c
create mode 100644 security/integrity/platform_certs/platform_keyring.c
create mode 100644 tools/testing/selftests/ima/Makefile
create mode 100644 tools/testing/selftests/ima/config
create mode 100755 tools/testing/selftests/ima/test_kexec_load.sh
