Re: [PATCH v3 08/16] tpm: move tpm_validate_commmand() to tpm2-space.c

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On 11/4/18 8:45 PM, Jarkko Sakkinen wrote:
Move tpm_validate_command() to tpm2-space.c and make it part of the
tpm2_prepare_space() flow. Make cc resolution as part of the TPM space
functionality in order to detach it from rest of the tpm_transmit()
flow.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
  drivers/char/tpm/tpm-interface.c | 72 +++++++-------------------------
  drivers/char/tpm/tpm.h           |  9 ++--
  drivers/char/tpm/tpm2-space.c    | 54 +++++++++++++++++++++---
  3 files changed, 68 insertions(+), 67 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 422e3bb0bd3d..3bf0c51b7b4f 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -62,47 +62,6 @@ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
  }
  EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);

-static int tpm_validate_command(struct tpm_chip *chip,
-				 struct tpm_space *space,
-				 const u8 *cmd,
-				 size_t len)
-{
-	const struct tpm_input_header *header = (const void *)cmd;
-	int i;
-	u32 cc;
-	u32 attrs;
-	unsigned int nr_handles;
-
-	if (len < TPM_HEADER_SIZE)
-		return -EINVAL;
-
-	if (!space)
-		return 0;
-
-	if (chip->flags & TPM_CHIP_FLAG_TPM2 && chip->nr_commands) {
-		cc = be32_to_cpu(header->ordinal);
-
-		i = tpm2_find_cc(chip, cc);
-		if (i < 0) {
-			dev_dbg(&chip->dev, "0x%04X is an invalid command\n",
-				cc);
-			return -EOPNOTSUPP;
-		}
-
-		attrs = chip->cc_attrs_tbl[i];
-		nr_handles =
-			4 * ((attrs >> TPM2_CC_ATTR_CHANDLES) & GENMASK(2, 0));
-		if (len < TPM_HEADER_SIZE + 4 * nr_handles)
-			goto err_len;
-	}
-
-	return 0;
-err_len:
-	dev_dbg(&chip->dev,
-		"%s: insufficient command length %zu", __func__, len);
-	return -EINVAL;
-}
-
  static int tpm_request_locality(struct tpm_chip *chip, unsigned int flags)
  {
  	int rc;
@@ -172,20 +131,8 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
  	u32 count, ordinal;
  	unsigned long stop;

-	rc = tpm_validate_command(chip, space, buf, bufsiz);
-	if (rc == -EINVAL)
-		return rc;
-	/*
-	 * If the command is not implemented by the TPM, synthesize a
-	 * response with a TPM2_RC_COMMAND_CODE return for user-space.
-	 */
-	if (rc == -EOPNOTSUPP) {
-		header->length = cpu_to_be32(sizeof(*header));
-		header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
-		header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
-						  TSS2_RESMGR_TPM_RC_LAYER);
-		return sizeof(*header);
-	}
+	if (bufsiz < TPM_HEADER_SIZE)
+		return -EINVAL;

  	if (bufsiz > TPM_BUFSIZE)
  		bufsiz = TPM_BUFSIZE;
@@ -200,7 +147,18 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
  		return -E2BIG;
  	}

-	rc = tpm2_prepare_space(chip, space, ordinal, buf);
+	rc = tpm2_prepare_space(chip, space, buf, bufsiz);
+	/*
+	 * If the command is not implemented by the TPM, synthesize a
+	 * response with a TPM2_RC_COMMAND_CODE return for user-space.
+	 */
+	if (rc == -EOPNOTSUPP) {
+		header->length = cpu_to_be32(sizeof(*header));
+		header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
+		header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
+						  TSS2_RESMGR_TPM_RC_LAYER);
+		return sizeof(*header);
+	}
  	if (rc)
  		return rc;

@@ -251,7 +209,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
  	if (rc)
  		tpm2_flush_space(chip);
  	else
-		rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
+		rc = tpm2_commit_space(chip, space, buf, &len);

  	return rc ? rc : len;
  }
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 229ac42b644e..8503dd261897 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -264,6 +264,7 @@ struct tpm_chip {
  #endif /* CONFIG_ACPI */

  	struct tpm_space work_space;
+	u32 last_cc;
  	u32 nr_commands;
  	u32 *cc_attrs_tbl;

@@ -580,10 +581,10 @@ int tpm2_find_cc(struct tpm_chip *chip, u32 cc);
  int tpm2_init_space(struct tpm_space *space);
  void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space);
  void tpm2_flush_space(struct tpm_chip *chip);
-int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u32 cc,
-		       u8 *cmd);
-int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space,
-		      u32 cc, u8 *buf, size_t *bufsiz);
+int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u8 *cmd,
+		       size_t cmdsiz);
+int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, u8 *buf,
+		       size_t *bufsiz);

  int tpm_bios_log_setup(struct tpm_chip *chip);
  void tpm_bios_log_teardown(struct tpm_chip *chip);
diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
index 3d5f9577e5de..20c295fadd50 100644
--- a/drivers/char/tpm/tpm2-space.c
+++ b/drivers/char/tpm/tpm2-space.c
@@ -264,14 +264,55 @@ static int tpm2_map_command(struct tpm_chip *chip, u32 cc, u8 *cmd)
  	return 0;
  }

-int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u32 cc,
-		       u8 *cmd)
+static int tpm_validate_command(struct tpm_chip *chip, struct tpm_space *space,
+				const u8 *cmd, size_t len)


Nit: len -> cmdsiz (like below)


+{
+	const struct tpm_input_header *header = (const void *)cmd;
+	int i;
+	u32 cc;
+	u32 attrs;
+	unsigned int nr_handles;
+
+	if (len < TPM_HEADER_SIZE)
+		return -EINVAL;
+
+	if (chip->nr_commands) {
+		cc = be32_to_cpu(header->ordinal);
+
+		i = tpm2_find_cc(chip, cc);
+		if (i < 0) {
+			dev_dbg(&chip->dev, "0x%04X is an invalid command\n",
+				cc);
+			return -EOPNOTSUPP;
+		}
+
+		attrs = chip->cc_attrs_tbl[i];
+		nr_handles =
+			4 * ((attrs >> TPM2_CC_ATTR_CHANDLES) & GENMASK(2, 0));
+		if (len < TPM_HEADER_SIZE + 4 * nr_handles)
+			goto err_len;
+	}
+
+	return cc;
+err_len:
+	dev_dbg(&chip->dev, "%s: insufficient command length %zu", __func__,
+		len);
+	return -EINVAL;
+}
+
+int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u8 *cmd,
+		       size_t cmdsiz)
  {
  	int rc;
+	int cc;

  	if (!space)
  		return 0;

+	cc = tpm_validate_command(chip, space, cmd, cmdsiz);
+	if (cc < 0)
+		return cc;
+
  	memcpy(&chip->work_space.context_tbl, &space->context_tbl,
  	       sizeof(space->context_tbl));
  	memcpy(&chip->work_space.session_tbl, &space->session_tbl,
@@ -291,6 +332,7 @@ int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u32 cc,
  		return rc;
  	}

+	chip->last_cc = cc;
  	return 0;
  }

@@ -489,8 +531,8 @@ static int tpm2_save_space(struct tpm_chip *chip)
  	return 0;
  }

-int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space,
-		      u32 cc, u8 *buf, size_t *bufsiz)
+int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, u8 *buf,
+		      size_t *bufsiz)
  {
  	struct tpm_output_header *header = (void *)buf;
  	int rc;
@@ -498,13 +540,13 @@ int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space,
  	if (!space)
  		return 0;

-	rc = tpm2_map_response_header(chip, cc, buf, *bufsiz);
+	rc = tpm2_map_response_header(chip, chip->last_cc, buf, *bufsiz);
  	if (rc) {
  		tpm2_flush_space(chip);
  		goto out;
  	}

-	rc = tpm2_map_response_body(chip, cc, buf, *bufsiz);
+	rc = tpm2_map_response_body(chip, chip->last_cc, buf, *bufsiz);
  	if (rc) {
  		tpm2_flush_space(chip);
  		goto out;

Rest looks good.

Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>




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