linux-kernel - [PATCH v6 02/10] tpm: Use -EPERM as fallback error code in tpm_ret_to

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Message-Id: <20251018111725.3116386-3-jarkko@kernel.org>
Date: Sat, 18 Oct 2025 14:17:17 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: linux-integrity@...r.kernel.org
Cc: keyring@...r.kernel.org,
	dpsmith@...rtussolutions.com,
	ross.philipson@...cle.com,
	Jonathan McDowell <noodles@...th.li>,
	Roberto Sassu <roberto.sassu@...wei.com>,
	Stefano Garzarella <sgarzare@...hat.com>,
	Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>,
	Peter Huewe <peterhuewe@....de>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Jason Gunthorpe <jgg@...pe.ca>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v6 02/10] tpm: Use -EPERM as fallback error code in tpm_ret_to_err

From: Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>

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@...nsys.com>
Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
---
v6:
- No changes.
v5:
- No changes.
v4:
- No changes.
v3:
- Removed fixes tag as it hardly categorizes as a bug fix.
v2:
- Split trusted_tpm2 change to a separate patch.
---
 include/linux/tpm.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index eb0ff071bcae..0e9e043f728c 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;
 	}
 }
 
-- 
2.39.5