ima: remove firmware and module specific cached status info

Each time a file is read by the kernel, the file should be re-measured and
the file signature re-appraised, based on policy.  As there is no need to
preserve the status information, this patch replaces the firmware and
module specific cache status with a generic one named read_file.

This change simplifies adding support for other files read by the kernel.

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Acked-by: Petko Manolov <petkan@mip-labs.com>
Acked-by: Dmitry Kasatkin <dmitry.kasatkin@huawei.com>

3 files changed, 22 insertions, 25 deletions

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 0b7134c..a5d2592 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -144,9 +144,10 @@ enum ima_hooks {
 	FILE_CHECK = 1,
 	MMAP_CHECK,
 	BPRM_CHECK,
+	POST_SETATTR,
 	MODULE_CHECK,
 	FIRMWARE_CHECK,
-	POST_SETATTR
+	MAX_CHECK
 };
 
 /* LIM API function definitions */
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index cb0d0ff..6b4694a 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -74,13 +74,12 @@ enum integrity_status ima_get_cache_status(struct integrity_iint_cache *iint,
 		return iint->ima_mmap_status;
 	case BPRM_CHECK:
 		return iint->ima_bprm_status;
-	case MODULE_CHECK:
-		return iint->ima_module_status;
-	case FIRMWARE_CHECK:
-		return iint->ima_firmware_status;
 	case FILE_CHECK:
-	default:
+	case POST_SETATTR:
 		return iint->ima_file_status;
+	case MODULE_CHECK ... MAX_CHECK - 1:
+	default:
+		return iint->ima_read_status;
 	}
 }
 
@@ -95,15 +94,14 @@ static void ima_set_cache_status(struct integrity_iint_cache *iint,
 	case BPRM_CHECK:
 		iint->ima_bprm_status = status;
 		break;
-	case MODULE_CHECK:
-		iint->ima_module_status = status;
-		break;
-	case FIRMWARE_CHECK:
-		iint->ima_firmware_status = status;
-		break;
 	case FILE_CHECK:
-	default:
+	case POST_SETATTR:
 		iint->ima_file_status = status;
+		break;
+	case MODULE_CHECK ... MAX_CHECK - 1:
+	default:
+		iint->ima_read_status = status;
+		break;
 	}
 }
 
@@ -117,15 +115,14 @@ static void ima_cache_flags(struct integrity_iint_cache *iint,
 	case BPRM_CHECK:
 		iint->flags |= (IMA_BPRM_APPRAISED | IMA_APPRAISED);
 		break;
-	case MODULE_CHECK:
-		iint->flags |= (IMA_MODULE_APPRAISED | IMA_APPRAISED);
-		break;
-	case FIRMWARE_CHECK:
-		iint->flags |= (IMA_FIRMWARE_APPRAISED | IMA_APPRAISED);
-		break;
 	case FILE_CHECK:
-	default:
+	case POST_SETATTR:
 		iint->flags |= (IMA_FILE_APPRAISED | IMA_APPRAISED);
+		break;
+	case MODULE_CHECK ... MAX_CHECK - 1:
+	default:
+		iint->flags |= (IMA_READ_APPRAISED | IMA_APPRAISED);
+		break;
 	}
 }
 
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index cfbe86f..7571ce8 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -300,13 +300,12 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
 		return IMA_MMAP_APPRAISE;
 	case BPRM_CHECK:
 		return IMA_BPRM_APPRAISE;
-	case MODULE_CHECK:
-		return IMA_MODULE_APPRAISE;
-	case FIRMWARE_CHECK:
-		return IMA_FIRMWARE_APPRAISE;
 	case FILE_CHECK:
-	default:
+	case POST_SETATTR:
 		return IMA_FILE_APPRAISE;
+	case MODULE_CHECK ... MAX_CHECK - 1:
+	default:
+		return IMA_READ_APPRAISE;
 	}
 }