[PATCH v3 0/7] Streamline TPM2 HMAC sessions

Jarkko Sakkinen
2025-12-10T14:39:46Z

Since we cannot at this point cache names of the keys given limitations
of the ASN.1 file format, I'll start a fresh patch set. Let's fixup what
we can right now.

This patch set addresses two major issues in the feature:

1. Dynamic resolution without gain. All kernel sites have at most single
handle to authorize. Even if this changes some day this is how it is
as of today and we definitely do not want to dictate the future but
instead downscale code to the metrics that we have as of today.
2. Eliminate at least one unnnecessary tpm2_read_public() call.

Jarkko Sakkinen (7):
KEYS: trusted: Remove dead branch from tpm2_unseal_cmd
tpm2-sessions: Define TPM2_NAME_MAX_SIZE
KEYS: trusted: Re-orchestrate tpm2_read_public() calls
tpm2-sessions: Remove AUTH_MAX_NAMES
tpm-buf: Remove tpm_buf_append_handle
tpm: Orchestrate TPM commands in tpm_get_random()
tpm: Send only one TPM command per hwrng request

drivers/char/tpm/tpm-buf.c | 25 ----
drivers/char/tpm/tpm-chip.c | 2 +-
drivers/char/tpm/tpm-interface.c | 174 ++++++++++++++++++++--
drivers/char/tpm/tpm-sysfs.c | 2 +-
drivers/char/tpm/tpm.h | 2 -
drivers/char/tpm/tpm1-cmd.c | 62 --------
drivers/char/tpm/tpm2-cmd.c | 102 +------------
drivers/char/tpm/tpm2-sessions.c | 130 +++++-----------
include/linux/tpm.h | 51 +++++--
security/keys/trusted-keys/trusted_tpm1.c | 8 +-
security/keys/trusted-keys/trusted_tpm2.c | 134 ++++++++++-------
11 files changed, 322 insertions(+), 370 deletions(-)

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2.52.0