[PATCH v4 3/4] KEYS: trusted: Open code tpm2_buf_append()

[Jarkko Sakkinen <jarkko@kernel.org>]

From: Jarkko Sakkinen <jarkko.sakkinen@opinsys.com>

tpm2_buf_append_auth() has only single call site and most of its parameters
are redundant. Open code it to the call site. Remove illegit FIXME comment
as there is no categorized bug and replace it with more sane comment about
implementation (i.e. "non-opionated inline comment").

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@opinsys.com>
Reviewed-by: Jonathan McDowell <noodles@earth.li>
---
 security/keys/trusted-keys/trusted_tpm2.c | 51 ++++-------------------
 1 file changed, 9 insertions(+), 42 deletions(-)

diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
index 07f04cc010bc..3b5dbbc2d257 100644
--- a/security/keys/trusted-keys/trusted_tpm2.c
+++ b/security/keys/trusted-keys/trusted_tpm2.c
@@ -226,36 +226,6 @@ int tpm2_key_parent_name(void *context, size_t hdrlen, unsigned char tag,
 
 	return 0;
 }
-/**
- * tpm2_buf_append_auth() - append TPMS_AUTH_COMMAND to the buffer.
- *
- * @buf: an allocated tpm_buf instance
- * @session_handle: session handle
- * @nonce: the session nonce, may be NULL if not used
- * @nonce_len: the session nonce length, may be 0 if not used
- * @attributes: the session attributes
- * @hmac: the session HMAC or password, may be NULL if not used
- * @hmac_len: the session HMAC or password length, maybe 0 if not used
- */
-static void tpm2_buf_append_auth(struct tpm_buf *buf, u32 session_handle,
-				 const u8 *nonce, u16 nonce_len,
-				 u8 attributes,
-				 const u8 *hmac, u16 hmac_len)
-{
-	tpm_buf_append_u32(buf, 9 + nonce_len + hmac_len);
-	tpm_buf_append_u32(buf, session_handle);
-	tpm_buf_append_u16(buf, nonce_len);
-
-	if (nonce && nonce_len)
-		tpm_buf_append(buf, nonce, nonce_len);
-
-	tpm_buf_append_u8(buf, attributes);
-	tpm_buf_append_u16(buf, hmac_len);
-
-	if (hmac && hmac_len)
-		tpm_buf_append(buf, hmac, hmac_len);
-}
-
 /**
  * tpm2_seal_trusted() - seal the payload of a trusted key
  *
@@ -549,19 +519,16 @@ static int tpm2_unseal_cmd(struct tpm_chip *chip,
 					    options->blobauth_len);
 	} else {
 		/*
-		 * FIXME: The policy session was generated outside the
-		 * kernel so we don't known the nonce and thus can't
-		 * calculate a HMAC on it.  Therefore, the user can
-		 * only really use TPM2_PolicyPassword and we must
-		 * send down the plain text password, which could be
-		 * intercepted.  We can still encrypt the returned
-		 * key, but that's small comfort since the interposer
-		 * could repeat our actions with the exfiltrated
-		 * password.
+		 * The policy session is generated outside the kernel, and thus
+		 * the password will end up being unencrypted on the bus, as
+		 * HMAC nonce cannot be calculated for it.
 		 */
-		tpm2_buf_append_auth(&buf, options->policyhandle,
-				     NULL /* nonce */, 0, 0,
-				     options->blobauth, options->blobauth_len);
+		tpm_buf_append_u32(&buf, 9 + options->blobauth_len);
+		tpm_buf_append_u32(&buf, options->policyhandle);
+		tpm_buf_append_u16(&buf, 0);
+		tpm_buf_append_u8(&buf, 0);
+		tpm_buf_append_u16(&buf, options->blobauth_len);
+		tpm_buf_append(&buf, options->blobauth, options->blobauth_len);
 		if (tpm2_chip_auth(chip)) {
 			tpm_buf_append_hmac_session(chip, &buf, TPM2_SA_ENCRYPT, NULL, 0);
 		} else  {
-- 
2.52.0