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authorDavid Safford <david.safford@gmail.com>2022-06-07 21:07:57 +0300
committerJarkko Sakkinen <jarkko@kernel.org>2022-06-08 14:12:13 +0300
commitdda5384313a40ecbaafd8a9a80f47483255e4c4d (patch)
tree4844450a4789b452a0561451cb270f173d57e948 /security
parent9886142c7a2226439c1e3f7d9b69f9c7094c3ef6 (diff)
downloadlinux-dda5384313a40ecbaafd8a9a80f47483255e4c4d.tar.xz
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>
Diffstat (limited to 'security')
-rw-r--r--security/keys/trusted-keys/trusted_tpm2.c4
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 */