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keys/trusted_keys: fix handle passed to tpm_buf_append_name during unseal

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TPM2_Unseal[1] expects the handle of a loaded data object, and not the
handle of the parent key. But the tpm2_unseal_cmd provides the parent
keyhandle instead of blob_handle for the session HMAC calculation. This
causes unseal to fail.

Fix this by passing blob_handle to tpm_buf_append_name().

References:

[1] trustedcomputinggroup.org/wp-content/uploads/
    Trusted-Platform-Module-2.0-Library-Part-3-Version-184_pub.pdf

Fixes: 6e9722e9a7 ("tpm2-sessions: Fix out of range indexing in name_size")
Signed-off-by: Srish Srinivasan <ssrish@linux.ibm.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
This commit is contained in:
Srish Srinivasan 2026-01-23 22:25:03 +05:30 • committed by Jarkko Sakkinen
parent d91a46d680
commit 6342969daf
1 changed files with 2 additions and 2 deletions
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4
security/keys/trusted-keys/trusted_tpm2.c
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@ -465,7 +465,7 @@ out:
}
/**
* tpm2_unseal_cmd() - execute a TPM2_Unload command
* tpm2_unseal_cmd() - execute a TPM2_Unseal command
*
* @chip: TPM chip to use
* @payload: the key data in clear and encrypted form
@ -498,7 +498,7 @@ static int tpm2_unseal_cmd(struct tpm_chip *chip,
return rc;
}
rc = tpm_buf_append_name(chip, &buf, options->keyhandle, NULL);
rc = tpm_buf_append_name(chip, &buf, blob_handle, NULL);
if (rc)
goto out;