On Fri, Jan 23, 2026 at 10:25:03PM +0530, Srish Srinivasan wrote:
> 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().
>
> Fixes: 6e9722e9a7bf ("tpm2-sessions: Fix out of range indexing in name_size")
>
> References:
> [1] trustedcomputinggroup.org/wp-content/uploads/
> Trusted-Platform-Module-2.0-Library-Part-3-Version-184_pub.pdf
>
> Signed-off-by: Srish Srinivasan <[email protected]>
> Reviewed-by: Stefan Berger <[email protected]>
> ---
> security/keys/trusted-keys/trusted_tpm2.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/security/keys/trusted-keys/trusted_tpm2.c
> b/security/keys/trusted-keys/trusted_tpm2.c
> index a7ea4a1c3bed..6340823f8b53 100644
> --- a/security/keys/trusted-keys/trusted_tpm2.c
> +++ b/security/keys/trusted-keys/trusted_tpm2.c
> @@ -465,7 +465,7 @@ static int tpm2_load_cmd(struct tpm_chip *chip,
> }
>
> /**
> - * 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;
>
> --
> 2.43.0
>
Reviewed-by: Jarkko Sakkinen <[email protected]>
And applied. I also need to check what is wrong with my QA because
it should have catched this.
BR, Jarkko
