Rename and document TPM2_OA_TMPL, as originally requested in the patch
set review, but left unaddressed without any appropriate reasoning. The
new name is TPM2_OA_NULL_KEY, has a documentation and is local only to
tpm2-sessions.c.
Link: https://lore.kernel.org/linux-integrity/ddbeb8111f48a8ddb0b8fca248dff6cc9d7079b2.camel@HansenPartnership.com/
Link: https://lore.kernel.org/linux-integrity/CZCKTWU6ZCC9.2UTEQPEVICYHL@suppilovahvero/
Signed-off-by: Jarkko Sakkinen <[email protected]>
---
v2:
- linux/tpm.h is not a place for AES_* constants. Move them also to
drivers/char/tpm/tpm2-sessions.c.
- Remove the comment related to TPM2_OA_TMPL as "key tcg documents"
is not a legit xerf, and thus only adds obfuscation.
---
drivers/char/tpm/tpm2-sessions.c | 21 +++++++++++++++++++--
include/linux/tpm.h | 15 ---------------
2 files changed, 19 insertions(+), 17 deletions(-)
diff --git a/drivers/char/tpm/tpm2-sessions.c b/drivers/char/tpm/tpm2-sessions.c
index ea8860661876..907ac9956a78 100644
--- a/drivers/char/tpm/tpm2-sessions.c
+++ b/drivers/char/tpm/tpm2-sessions.c
@@ -80,6 +80,9 @@
/* maximum number of names the TPM must remember for authorization */
#define AUTH_MAX_NAMES 3
+#define AES_KEY_BYTES AES_KEYSIZE_128
+#define AES_KEY_BITS (AES_KEY_BYTES*8)
+
static int tpm2_create_primary(struct tpm_chip *chip, u32 hierarchy,
u32 *handle, u8 *name);
@@ -954,6 +957,20 @@ int tpm2_start_auth_session(struct tpm_chip *chip)
}
EXPORT_SYMBOL(tpm2_start_auth_session);
+/*
+ * A mask containing the object attributes for the kernel held null primary key
+ * used in HMAC encryption. For more information on specific attributes look up
+ * to "8.3 TPMA_OBJECT (Object Attributes)".
+ */
+#define TPM2_OA_NULL_KEY ( \
+ TPM2_OA_NO_DA | \
+ TPM2_OA_FIXED_TPM | \
+ TPM2_OA_FIXED_PARENT | \
+ TPM2_OA_SENSITIVE_DATA_ORIGIN | \
+ TPM2_OA_USER_WITH_AUTH | \
+ TPM2_OA_DECRYPT | \
+ TPM2_OA_RESTRICTED)
+
/**
* tpm2_parse_create_primary() - parse the data returned from TPM_CC_CREATE_PRIMARY
*
@@ -1018,7 +1035,7 @@ static int tpm2_parse_create_primary(struct tpm_chip *chip, struct tpm_buf *buf,
val = tpm_buf_read_u32(buf, &offset_t);
/* object properties */
- if (val != TPM2_OA_TMPL)
+ if (val != TPM2_OA_NULL_KEY)
return -EINVAL;
/* auth policy (empty) */
@@ -1178,7 +1195,7 @@ static int tpm2_create_primary(struct tpm_chip *chip, u32 hierarchy,
tpm_buf_append_u16(&template, TPM_ALG_SHA256);
/* object properties */
- tpm_buf_append_u32(&template, TPM2_OA_TMPL);
+ tpm_buf_append_u32(&template, TPM2_OA_NULL_KEY);
/* sauth policy (empty) */
tpm_buf_append_u16(&template, 0);
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index b3217200df28..21a67dc9efe8 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -394,21 +394,6 @@ enum tpm2_object_attributes {
TPM2_OA_SIGN = BIT(18),
};
-/*
- * definitions for the canonical template. These are mandated
- * by the TCG key template documents
- */
-
-#define AES_KEY_BYTES AES_KEYSIZE_128
-#define AES_KEY_BITS (AES_KEY_BYTES*8)
-#define TPM2_OA_TMPL (TPM2_OA_NO_DA | \
- TPM2_OA_FIXED_TPM | \
- TPM2_OA_FIXED_PARENT | \
- TPM2_OA_SENSITIVE_DATA_ORIGIN | \
- TPM2_OA_USER_WITH_AUTH | \
- TPM2_OA_DECRYPT | \
- TPM2_OA_RESTRICTED)
-
enum tpm2_session_attributes {
TPM2_SA_CONTINUE_SESSION = BIT(0),
TPM2_SA_AUDIT_EXCLUSIVE = BIT(1),
--
2.45.1