Merge tag 'integrity-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity

Pull integrity subsystem updates from Mimi Zohar:

 - With commit 099f26f22f58 ("integrity: machine keyring CA
   configuration") certificates may be loaded onto the IMA keyring,
   directly or indirectly signed by keys on either the "builtin" or the
   "machine" keyrings.

   With the ability for the system/machine owner to sign the IMA policy
   itself without needing to recompile the kernel, update the IMA
   architecture specific policy rules to require the IMA policy itself
   be signed.

   [ As commit 099f26f22f58 was upstreamed in linux-6.4, updating the
     IMA architecture specific policy now to require signed IMA policies
     may break userspace expectations. ]

 - IMA only checked the file data hash was not on the system blacklist
   keyring for files with an appended signature (e.g. kernel modules,
   Power kernel image).

   Check all file data hashes regardless of how it was signed

 - Code cleanup, and a kernel-doc update

* tag 'integrity-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity:
  kexec_lock: Replace kexec_mutex() by kexec_lock() in two comments
  ima: require signed IMA policy when UEFI secure boot is enabled
  integrity: Always reference the blacklist keyring with appraisal
  ima: Remove deprecated IMA_TRUSTED_KEYRING Kconfig

1 files changed, 5 insertions, 12 deletions

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 7a0420cf1a6a..f69062617754 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1280,7 +1280,7 @@ static bool ima_validate_rule(struct ima_rule_entry *entry)
 				     IMA_FSNAME | IMA_GID | IMA_EGID |
 				     IMA_FGROUP | IMA_DIGSIG_REQUIRED |
 				     IMA_PERMIT_DIRECTIO | IMA_VALIDATE_ALGOS |
-				     IMA_VERITY_REQUIRED))
+				     IMA_CHECK_BLACKLIST | IMA_VERITY_REQUIRED))
 			return false;
 
 		break;
@@ -1355,7 +1355,7 @@ static bool ima_validate_rule(struct ima_rule_entry *entry)
 
 	/* Ensure that combinations of flags are compatible with each other */
 	if (entry->flags & IMA_CHECK_BLACKLIST &&
-	    !(entry->flags & IMA_MODSIG_ALLOWED))
+	    !(entry->flags & IMA_DIGSIG_REQUIRED))
 		return false;
 
 	/*
@@ -1803,11 +1803,11 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
 				if (entry->flags & IMA_VERITY_REQUIRED)
 					result = -EINVAL;
 				else
-					entry->flags |= IMA_DIGSIG_REQUIRED;
+					entry->flags |= IMA_DIGSIG_REQUIRED | IMA_CHECK_BLACKLIST;
 			} else if (strcmp(args[0].from, "sigv3") == 0) {
 				/* Only fsverity supports sigv3 for now */
 				if (entry->flags & IMA_VERITY_REQUIRED)
-					entry->flags |= IMA_DIGSIG_REQUIRED;
+					entry->flags |= IMA_DIGSIG_REQUIRED | IMA_CHECK_BLACKLIST;
 				else
 					result = -EINVAL;
 			} else if (IS_ENABLED(CONFIG_IMA_APPRAISE_MODSIG) &&
@@ -1816,18 +1816,13 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
 					result = -EINVAL;
 				else
 					entry->flags |= IMA_DIGSIG_REQUIRED |
-						IMA_MODSIG_ALLOWED;
+						IMA_MODSIG_ALLOWED | IMA_CHECK_BLACKLIST;
 			} else {
 				result = -EINVAL;
 			}
 			break;
 		case Opt_appraise_flag:
 			ima_log_string(ab, "appraise_flag", args[0].from);
-			if (IS_ENABLED(CONFIG_IMA_APPRAISE_MODSIG) &&
-			    strstr(args[0].from, "blacklist"))
-				entry->flags |= IMA_CHECK_BLACKLIST;
-			else
-				result = -EINVAL;
 			break;
 		case Opt_appraise_algos:
 			ima_log_string(ab, "appraise_algos", args[0].from);
@@ -2271,8 +2266,6 @@ int ima_policy_show(struct seq_file *m, void *v)
 	}
 	if (entry->flags & IMA_VERITY_REQUIRED)
 		seq_puts(m, "digest_type=verity ");
-	if (entry->flags & IMA_CHECK_BLACKLIST)
-		seq_puts(m, "appraise_flag=check_blacklist ");
 	if (entry->flags & IMA_PERMIT_DIRECTIO)
 		seq_puts(m, "permit_directio ");
 	rcu_read_unlock();