diff --git a/include/linux/integrity.h b/include/linux/integrity.h
index 2271939c5c3140d2ca80efb68b5e6e6c99e7098c..2ea0f2f65ab6a9e773783a99b549b89d8fd18d9e 100644
--- a/include/linux/integrity.h
+++ b/include/linux/integrity.h
@@ -13,6 +13,7 @@ enum integrity_status {
 	INTEGRITY_PASS = 0,
 	INTEGRITY_PASS_IMMUTABLE,
 	INTEGRITY_FAIL,
+	INTEGRITY_FAIL_IMMUTABLE,
 	INTEGRITY_NOLABEL,
 	INTEGRITY_NOXATTRS,
 	INTEGRITY_UNKNOWN,
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index 5f8650c5902651d71d150e47a8622461d3c6cc61..1e68f23c07f973a5821399f18eb0d625763074b3 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -27,7 +27,8 @@
 int evm_initialized;
 
 static const char * const integrity_status_msg[] = {
-	"pass", "pass_immutable", "fail", "no_label", "no_xattrs", "unknown"
+	"pass", "pass_immutable", "fail", "fail_immutable", "no_label",
+	"no_xattrs", "unknown"
 };
 int evm_hmac_attrs;
 
@@ -155,7 +156,7 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry,
 	enum integrity_status evm_status = INTEGRITY_PASS;
 	struct evm_digest digest;
 	struct inode *inode;
-	int rc, xattr_len;
+	int rc, xattr_len, evm_immutable = 0;
 
 	if (iint && (iint->evm_status == INTEGRITY_PASS ||
 		     iint->evm_status == INTEGRITY_PASS_IMMUTABLE))
@@ -200,8 +201,10 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry,
 		if (rc)
 			rc = -EINVAL;
 		break;
-	case EVM_IMA_XATTR_DIGSIG:
 	case EVM_XATTR_PORTABLE_DIGSIG:
+		evm_immutable = 1;
+		fallthrough;
+	case EVM_IMA_XATTR_DIGSIG:
 		/* accept xattr with non-empty signature field */
 		if (xattr_len <= sizeof(struct signature_v2_hdr)) {
 			evm_status = INTEGRITY_FAIL;
@@ -238,9 +241,12 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry,
 		break;
 	}
 
-	if (rc)
-		evm_status = (rc == -ENODATA) ?
-				INTEGRITY_NOXATTRS : INTEGRITY_FAIL;
+	if (rc) {
+		evm_status = INTEGRITY_NOXATTRS;
+		if (rc != -ENODATA)
+			evm_status = evm_immutable ?
+				     INTEGRITY_FAIL_IMMUTABLE : INTEGRITY_FAIL;
+	}
 out:
 	if (iint)
 		iint->evm_status = evm_status;
@@ -374,6 +380,14 @@ static int evm_protect_xattr(struct dentry *dentry, const char *xattr_name,
 out:
 	if (evm_ignore_error_safe(evm_status))
 		return 0;
+
+	/*
+	 * Writing other xattrs is safe for portable signatures, as portable
+	 * signatures are immutable and can never be updated.
+	 */
+	if (evm_status == INTEGRITY_FAIL_IMMUTABLE)
+		return 0;
+
 	if (evm_status != INTEGRITY_PASS)
 		integrity_audit_msg(AUDIT_INTEGRITY_METADATA, d_backing_inode(dentry),
 				    dentry->d_name.name, "appraise_metadata",
@@ -534,8 +548,13 @@ int evm_inode_setattr(struct dentry *dentry, struct iattr *attr)
 	if (!(ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID)))
 		return 0;
 	evm_status = evm_verify_current_integrity(dentry);
+	/*
+	 * Writing attrs is safe for portable signatures, as portable signatures
+	 * are immutable and can never be updated.
+	 */
 	if ((evm_status == INTEGRITY_PASS) ||
 	    (evm_status == INTEGRITY_NOXATTRS) ||
+	    (evm_status == INTEGRITY_FAIL_IMMUTABLE) ||
 	    (evm_ignore_error_safe(evm_status)))
 		return 0;
 	integrity_audit_msg(AUDIT_INTEGRITY_METADATA, d_backing_inode(dentry),
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 0f42269ecfa99d42da07af8f8f9801b68e51ff1f..ce864b9f49b7475873b05fe1039b65a398f5c619 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -410,6 +410,8 @@ int ima_appraise_measurement(enum ima_hooks func,
 	case INTEGRITY_NOLABEL:		/* No security.evm xattr. */
 		cause = "missing-HMAC";
 		goto out;
+	case INTEGRITY_FAIL_IMMUTABLE:
+		fallthrough;
 	case INTEGRITY_FAIL:		/* Invalid HMAC/signature. */
 		cause = "invalid-HMAC";
 		goto out;