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tpm: fix: set continueSession attribute for the unseal operation

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It's better to set the continueSession attribute for the unseal
operation so that the session object is not removed as a side-effect
when the operation is successful. Since a user process created the
session, it should be also decide when the session is destroyed.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Fixes: 5beb0c435b ("keys, trusted: seal with a TPM2 authorization policy")
This commit is contained in:
Jarkko Sakkinen 2016-02-13 11:51:23 +02:00
parent 8e0ee3c9fa
commit c0b5eed110
1 changed files with 7 additions and 3 deletions
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10
drivers/char/tpm/tpm2-cmd.c
View file

@ -20,7 +20,11 @@
#include <keys/trusted-type.h>
enum tpm2_object_attributes {
TPM2_ATTR_USER_WITH_AUTH = BIT(6),
TPM2_OA_USER_WITH_AUTH = BIT(6),
};
enum tpm2_session_attributes {
TPM2_SA_CONTINUE_SESSION = BIT(0),
};
struct tpm2_startup_in {
@ -489,7 +493,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
tpm_buf_append(&buf, options->policydigest,
options->policydigest_len);
} else {
tpm_buf_append_u32(&buf, TPM2_ATTR_USER_WITH_AUTH);
tpm_buf_append_u32(&buf, TPM2_OA_USER_WITH_AUTH);
tpm_buf_append_u16(&buf, 0);
}
@ -627,7 +631,7 @@ static int tpm2_unseal(struct tpm_chip *chip,
options->policyhandle ?
options->policyhandle : TPM2_RS_PW,
NULL /* nonce */, 0,
0 /* session_attributes */,
TPM2_SA_CONTINUE_SESSION,
options->blobauth /* hmac */,
TPM_DIGEST_SIZE);