diff options
| author | David Safford <david.safford@gmail.com> | 2022-06-07 14:07:57 -0400 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko@kernel.org> | 2022-06-08 14:12:13 +0300 |
| commit | dda5384313a40ecbaafd8a9a80f47483255e4c4d (patch) | |
| tree | 4844450a4789b452a0561451cb270f173d57e948 | |
| parent | 9886142c7a2226439c1e3f7d9b69f9c7094c3ef6 (diff) | |
| download | linux-dda5384313a40ecbaafd8a9a80f47483255e4c4d.tar.gz | |
KEYS: trusted: tpm2: Fix migratable logic
When creating (sealing) a new trusted key, migratable
trusted keys have the FIXED_TPM and FIXED_PARENT attributes
set, and non-migratable keys don't. This is backwards, and
also causes creation to fail when creating a migratable key
under a migratable parent. (The TPM thinks you are trying to
seal a non-migratable blob under a migratable parent.)
The following simple patch fixes the logic, and has been
tested for all four combinations of migratable and non-migratable
trusted keys and parent storage keys. With this logic, you will
get a proper failure if you try to create a non-migratable
trusted key under a migratable parent storage key, and all other
combinations work correctly.
Cc: stable@vger.kernel.org # v5.13+
Fixes: e5fb5d2c5a03 ("security: keys: trusted: Make sealed key properly interoperable")
Signed-off-by: David Safford <david.safford@gmail.com>
Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
| -rw-r--r-- | security/keys/trusted-keys/trusted_tpm2.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c index 0165da386289..2b2c8eb258d5 100644 --- a/security/keys/trusted-keys/trusted_tpm2.c +++ b/security/keys/trusted-keys/trusted_tpm2.c @@ -283,8 +283,8 @@ int tpm2_seal_trusted(struct tpm_chip *chip, /* key properties */ flags = 0; flags |= options->policydigest_len ? 0 : TPM2_OA_USER_WITH_AUTH; - flags |= payload->migratable ? (TPM2_OA_FIXED_TPM | - TPM2_OA_FIXED_PARENT) : 0; + flags |= payload->migratable ? 0 : (TPM2_OA_FIXED_TPM | + TPM2_OA_FIXED_PARENT); tpm_buf_append_u32(&buf, flags); /* policy */ |