From: Jarkko Sakkinen <jarkko.sakkinen@opinsys.com>
Date: Tue, 30 Sep 2025 13:02:54 +0000 (+0300)
Subject: tpm: Use -EPERM as fallback error code in tpm_ret_to_err
X-Git-Url: https://gentwo.org/gitweb/?a=commitdiff_plain;h=7fcf459ac84c42a4ef63a650dccc345602cf4da6;p=linux%2F.git

tpm: Use -EPERM as fallback error code in tpm_ret_to_err

Using -EFAULT as the tpm_ret_to_err() fallback error code causes makes it
incompatible on how trusted keys transmute TPM return codes.

Change the fallback as -EPERM in order to gain compatibility with trusted
keys. In addition, map TPM_RC_HASH to -EINVAL in order to be compatible
with tpm2_seal_trusted() return values.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@opinsys.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---

diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 53de9488c509..3d8f7d1ce2b8 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -456,8 +456,10 @@ static inline ssize_t tpm_ret_to_err(ssize_t ret)
 		return 0;
 	case TPM2_RC_SESSION_MEMORY:
 		return -ENOMEM;
+	case TPM2_RC_HASH:
+		return -EINVAL;
 	default:
-		return -EFAULT;
+		return -EPERM;
 	}
 }