Messages in this thread Patch in this message | | | From | Nayna Jain <> | Subject | [PATCH 7/7] ima: Support platform keyring for kernel appraisal | Date | Sun, 25 Nov 2018 20:45:00 +0530 |
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On secure boot enabled systems, the bootloader verifies the kernel image and possibly the initramfs signatures based on a set of keys. A soft reboot(kexec) of the system, with the same kernel image and initramfs, requires access to the original keys to verify the signatures.
This patch allows IMA-appraisal access to those original keys, now loaded on the platform keyring, needed for verifying the kernel image and initramfs signatures.
Signed-off-by: Nayna Jain <nayna@linux.ibm.com> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com> --- security/integrity/ima/ima_appraise.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index deec1804a00a..9c13585e7d3e 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -294,7 +294,16 @@ int ima_appraise_measurement(enum ima_hooks func, iint->ima_hash->length); if (rc == -EOPNOTSUPP) { status = INTEGRITY_UNKNOWN; - } else if (rc) { + break; + } + if (rc && func == KEXEC_KERNEL_CHECK) + rc = integrity_digsig_verify( + INTEGRITY_KEYRING_PLATFORM, + (const char *)xattr_value, + xattr_len, + iint->ima_hash->digest, + iint->ima_hash->length); + if (rc) { cause = "invalid-signature"; status = INTEGRITY_FAIL; } else { -- 2.13.6
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