[4/6] tpm: move tpm_validate_commmand() to tpm2-space.c

Commit Message

Jarkko Sakkinen Nov. 3, 2018, 4:08 a.m. UTC

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 <[e-mail]>
---
 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(-)

Comments

kernel test robot Nov. 3, 2018, 11:11 a.m. UTC | #1

Hi Jarkko,

I love your patch! Perhaps something to improve:

[auto build test WARNING on jss-tpmdd/next]
[also build test WARNING on next-20181102]
[cannot apply to v4.19]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Jarkko-Sakkinen/Detach-TPM-space-code-from-tpm_transmit-flow/20181103-183010
base:   git://git.infradead.org/users/jjs/linux-tpmdd next
config: i386-randconfig-x002-201843 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   drivers/char/tpm/tpm2-space.c: In function 'tpm2_prepare_space':
>> drivers/char/tpm/tpm2-space.c:335:16: warning: 'cc' may be used uninitialized in this function [-Wmaybe-uninitialized]
     chip->last_cc = cc;
     ~~~~~~~~~~~~~~^~~~

vim +/cc +335 drivers/char/tpm/tpm2-space.c

   302	
   303	int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u8 *cmd,
   304			       size_t cmdsiz)
   305	{
   306		int rc;
   307		int cc;
   308	
   309		if (!space)
   310			return 0;
   311	
   312		cc = tpm_validate_command(chip, space, cmd, cmdsiz);
   313		if (cc < 0)
   314			return cc;
   315	
   316		memcpy(&chip->work_space.context_tbl, &space->context_tbl,
   317		       sizeof(space->context_tbl));
   318		memcpy(&chip->work_space.session_tbl, &space->session_tbl,
   319		       sizeof(space->session_tbl));
   320		memcpy(chip->work_space.context_buf, space->context_buf, PAGE_SIZE);
   321		memcpy(chip->work_space.session_buf, space->session_buf, PAGE_SIZE);
   322	
   323		rc = tpm2_load_space(chip);
   324		if (rc) {
   325			tpm2_flush_space(chip);
   326			return rc;
   327		}
   328	
   329		rc = tpm2_map_command(chip, cc, cmd);
   330		if (rc) {
   331			tpm2_flush_space(chip);
   332			return rc;
   333		}
   334	
 > 335		chip->last_cc = cc;
   336		return 0;
   337	}
   338	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

Patch

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index dd97a17243e3..dcdf2436ae44 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;
 
@@ -244,7 +202,7 @@  static ssize_t tpm_try_transmit(struct tpm_chip *chip,
 	if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length))
 		return -EFAULT;
 
-	rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
+	rc = tpm2_commit_space(chip, space, buf, &len);
 	if (rc) {
 		dev_err(&chip->dev, "%s: commit error %d\n", __func__, rc);
 		return rc;
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 49bca4d1e786..d4a5d5ca64b0 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;
 
@@ -579,10 +580,10 @@  int tpm2_probe(struct tpm_chip *chip);
 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);
-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 1131a8e7b79b..eb8f85b6f485 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)
+{
+	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);
 		return rc;
 	}
 
-	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);
 		return rc;