Re: [PATCH v5 12/17] tpm: remove @space from tpm_transmit()

From: Stefan Berger
Date: Thu Nov 08 2018 - 10:18:45 EST

Next message: Peter Huewe: "Re: [PATCH v4 4/6] tpm: modify tpm_pcr_read() definition to pass a TPM hash algorithm"
Previous message: Borislav Petkov: "Re: [PATCH v5 5/8] ARM: l2x0: add marvell,ecc-enable property for aurora"
In reply to: Jarkko Sakkinen: "[PATCH v5 12/17] tpm: remove @space from tpm_transmit()"
Next in thread: Jarkko Sakkinen: "[PATCH v5 13/17] tpm: use tpm_try_get_ops() in tpm-sysfs.c."
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On 11/8/18 9:15 AM, Jarkko Sakkinen wrote:

Remove @space from tpm_transmit() API` in order to completely remove the
bound between low-level transmission functionality and TPM spaces. The
only real dependency existing is the amount of data saved before trying
to send a command to the TPM.

It doesn't really matter if we save always a bit more than needed so
this commit changes the amount saved always to be the size of the TPM
header and three handles.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>

Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>

---
drivers/char/tpm/tpm-dev-common.c | 2 +-
drivers/char/tpm/tpm-interface.c | 25 ++++++++++---------------
drivers/char/tpm/tpm-sysfs.c | 5 ++---
drivers/char/tpm/tpm.h | 10 +++++-----
drivers/char/tpm/tpm1-cmd.c | 16 +++++++---------
drivers/char/tpm/tpm2-cmd.c | 30 ++++++++++++++----------------
drivers/char/tpm/tpm2-space.c | 6 ++----
drivers/char/tpm/tpm_vtpm_proxy.c | 2 +-
8 files changed, 42 insertions(+), 54 deletions(-)

diff --git a/drivers/char/tpm/tpm-dev-common.c b/drivers/char/tpm/tpm-dev-common.c
index 40c1cb09ebd2..c7dc54930576 100644
--- a/drivers/char/tpm/tpm-dev-common.c
+++ b/drivers/char/tpm/tpm-dev-common.c
@@ -48,7 +48,7 @@ static ssize_t tpm_dev_transmit(struct tpm_chip *chip, struct tpm_space *space,
if (ret)
goto out_lock;

- len = tpm_transmit(chip, space, buf, bufsiz, TPM_TRANSMIT_UNLOCKED);
+ len = tpm_transmit(chip, buf, bufsiz, TPM_TRANSMIT_UNLOCKED);
if (len < 0)
ret = len;

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 7bec03e46043..8d75c103f280 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -120,9 +120,7 @@ static int tpm_go_idle(struct tpm_chip *chip, unsigned int flags)
return chip->ops->go_idle(chip);
}

-static ssize_t tpm_try_transmit(struct tpm_chip *chip,
- struct tpm_space *space,
- u8 *buf, size_t bufsiz,
+static ssize_t tpm_try_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
unsigned int flags)
{
struct tpm_header *header = (void *)buf;
@@ -192,7 +190,6 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
/**
* tpm_transmit - Internal kernel interface to transmit TPM commands.
* @chip: a TPM chip to use
- * @space: a TPM space
* @buf: a TPM command buffer
* @bufsiz: length of the TPM command buffer
* @flags: TPM transmit flags
@@ -208,8 +205,8 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
* * The response length - OK
* * -errno - A system error
*/
-ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
- u8 *buf, size_t bufsiz, unsigned int flags)
+ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
+ unsigned int flags)
{
struct tpm_header *header = (struct tpm_header *)buf;
/* space for header and handles */
@@ -218,8 +215,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
bool has_locality = false;
u32 rc = 0;
ssize_t ret;
- const size_t save_size = min(space ? sizeof(save) : TPM_HEADER_SIZE,
- bufsiz);
+ const size_t save_size = min(sizeof(save), bufsiz);
/* the command code is where the return code will be */
u32 cc = be32_to_cpu(header->return_code);

@@ -249,7 +245,7 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
if (ret)
goto out_locality;

- ret = tpm_try_transmit(chip, space, buf, bufsiz, flags);
+ ret = tpm_try_transmit(chip, buf, bufsiz, flags);

/* This may fail but do not override ret. */
tpm_go_idle(chip, flags);
@@ -295,7 +291,6 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
/**
* tpm_transmit_cmd - send a tpm command to the device
* @chip: a TPM chip to use
- * @space: a TPM space
* @buf: a TPM command buffer
* @min_rsp_body_length: minimum expected length of response body
* @flags: TPM transmit flags
@@ -306,15 +301,15 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
* * -errno - A system error
* * TPM_RC - A TPM error
*/
-ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
- struct tpm_buf *buf, size_t min_rsp_body_length,
- unsigned int flags, const char *desc)
+ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,
+ size_t min_rsp_body_length, unsigned int flags,
+ const char *desc)
{
const struct tpm_header *header = (struct tpm_header *)buf->data;
int err;
ssize_t len;

- len = tpm_transmit(chip, space, buf->data, PAGE_SIZE, flags);
+ len = tpm_transmit(chip, buf->data, PAGE_SIZE, flags);
if (len < 0)
return len;

@@ -463,7 +458,7 @@ int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
goto out;

memcpy(buf.data, cmd, buflen);
- rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0,
+ rc = tpm_transmit_cmd(chip, &buf, 0, 0,
"attempting to a send a command");
tpm_buf_destroy(&buf);
out:
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 928d4e839bb7..03e704f99ed6 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -52,9 +52,8 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,

tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));

- rc = tpm_transmit_cmd(chip, NULL, &tpm_buf,
- READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
- "attempting to read the PUBEK");
+ rc = tpm_transmit_cmd(chip, &tpm_buf, READ_PUBEK_RESULT_MIN_BODY_SIZE,
+ 0, "attempting to read the PUBEK");
if (rc) {
tpm_buf_destroy(&tpm_buf);
return 0;
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 68d78ebba032..10a5bcf806aa 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -498,11 +498,11 @@ enum tpm_transmit_flags {
TPM_TRANSMIT_NESTED = BIT(1),
};

-ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
- u8 *buf, size_t bufsiz, unsigned int flags);
-ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
- struct tpm_buf *buf, size_t min_rsp_body_length,
- unsigned int flags, const char *desc);
+ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
+ unsigned int flags);
+ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,
+ size_t min_rsp_body_length, unsigned int flags,
+ const char *desc);
int tpm_get_timeouts(struct tpm_chip *);
int tpm_auto_startup(struct tpm_chip *chip);

diff --git a/drivers/char/tpm/tpm1-cmd.c b/drivers/char/tpm/tpm1-cmd.c
index f19b7c1ff800..162c255dd131 100644
--- a/drivers/char/tpm/tpm1-cmd.c
+++ b/drivers/char/tpm/tpm1-cmd.c
@@ -334,8 +334,7 @@ static int tpm1_startup(struct tpm_chip *chip)

tpm_buf_append_u16(&buf, TPM_ST_CLEAR);

- rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0,
- "attempting to start the TPM");
+ rc = tpm_transmit_cmd(chip, &buf, 0, 0, "attempting to start the TPM");
tpm_buf_destroy(&buf);
return rc;
}
@@ -460,7 +459,7 @@ int tpm1_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash,
tpm_buf_append_u32(&buf, pcr_idx);
tpm_buf_append(&buf, hash, TPM_DIGEST_SIZE);

- rc = tpm_transmit_cmd(chip, NULL, &buf, TPM_DIGEST_SIZE, 0, log_msg);
+ rc = tpm_transmit_cmd(chip, &buf, TPM_DIGEST_SIZE, 0, log_msg);
tpm_buf_destroy(&buf);
return rc;
}
@@ -490,7 +489,7 @@ ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
tpm_buf_append_u32(&buf, 4);
tpm_buf_append_u32(&buf, subcap_id);
}
- rc = tpm_transmit_cmd(chip, NULL, &buf, min_cap_length, 0, desc);
+ rc = tpm_transmit_cmd(chip, &buf, min_cap_length, 0, desc);
if (!rc)
*cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
tpm_buf_destroy(&buf);
@@ -531,8 +530,7 @@ int tpm1_get_random(struct tpm_chip *chip, u8 *dest, size_t max)
do {
tpm_buf_append_u32(&buf, num_bytes);

- rc = tpm_transmit_cmd(chip, NULL, &buf,
- sizeof(out->rng_data_len), 0,
+ rc = tpm_transmit_cmd(chip, &buf, sizeof(out->rng_data_len), 0,
"attempting get random");
if (rc)
goto out;
@@ -577,7 +575,7 @@ int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)

tpm_buf_append_u32(&buf, pcr_idx);

- rc = tpm_transmit_cmd(chip, NULL, &buf, TPM_DIGEST_SIZE, 0,
+ rc = tpm_transmit_cmd(chip, &buf, TPM_DIGEST_SIZE, 0,
"attempting to read a pcr value");
if (rc)
goto out;
@@ -611,7 +609,7 @@ static int tpm1_continue_selftest(struct tpm_chip *chip)
if (rc)
return rc;

- rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0, "continue selftest");
+ rc = tpm_transmit_cmd(chip, &buf, 0, 0, "continue selftest");
tpm_buf_destroy(&buf);
return rc;
}
@@ -737,7 +735,7 @@ int tpm1_pm_suspend(struct tpm_chip *chip, u32 tpm_suspend_pcr)
return rc;
/* now do the actual savestate */
for (try = 0; try < TPM_RETRY; try++) {
- rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0, NULL);
+ rc = tpm_transmit_cmd(chip, &buf, 0, 0, NULL);
/*
* If the TPM indicates that it is too busy to respond to
* this command then retry before giving up. It can take
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index ab03f8600f89..f2b0e5c52a57 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -197,7 +197,7 @@ int tpm2_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
tpm_buf_append(&buf, (const unsigned char *)pcr_select,
sizeof(pcr_select));

- rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0, res_buf ?
+ rc = tpm_transmit_cmd(chip, &buf, 0, 0, res_buf ?
"attempting to read a pcr value" : NULL);
if (rc == 0 && res_buf) {
out = (struct tpm2_pcr_read_out *)&buf.data[TPM_HEADER_SIZE];
@@ -264,7 +264,7 @@ int tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, u32 count,
}
}

- rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0,
+ rc = tpm_transmit_cmd(chip, &buf, 0, 0,
"attempting extend a PCR value");

tpm_buf_destroy(&buf);
@@ -309,7 +309,7 @@ int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max)
do {
tpm_buf_reset(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_RANDOM);
tpm_buf_append_u16(&buf, num_bytes);
- err = tpm_transmit_cmd(chip, NULL, &buf,
+ err = tpm_transmit_cmd(chip, &buf,
offsetof(struct tpm2_get_random_out,
buffer),
0, "attempting get random");
@@ -362,7 +362,7 @@ void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,

tpm_buf_append_u32(&buf, handle);

- tpm_transmit_cmd(chip, NULL, &buf, 0, flags, "flushing context");
+ tpm_transmit_cmd(chip, &buf, 0, flags, "flushing context");
tpm_buf_destroy(&buf);
}

@@ -476,7 +476,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
goto out;
}

- rc = tpm_transmit_cmd(chip, NULL, &buf, 4, 0, "sealing data");
+ rc = tpm_transmit_cmd(chip, &buf, 4, 0, "sealing data");
if (rc)
goto out;

@@ -558,7 +558,7 @@ static int tpm2_load_cmd(struct tpm_chip *chip,
goto out;
}

- rc = tpm_transmit_cmd(chip, NULL, &buf, 4, flags, "loading blob");
+ rc = tpm_transmit_cmd(chip, &buf, 4, flags, "loading blob");
if (!rc)
*blob_handle = be32_to_cpup(
(__be32 *) &buf.data[TPM_HEADER_SIZE]);
@@ -608,7 +608,7 @@ static int tpm2_unseal_cmd(struct tpm_chip *chip,
options->blobauth /* hmac */,
TPM_DIGEST_SIZE);

- rc = tpm_transmit_cmd(chip, NULL, &buf, 6, flags, "unsealing");
+ rc = tpm_transmit_cmd(chip, &buf, 6, flags, "unsealing");
if (rc > 0)
rc = -EPERM;

@@ -698,7 +698,7 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
tpm_buf_append_u32(&buf, TPM2_CAP_TPM_PROPERTIES);
tpm_buf_append_u32(&buf, property_id);
tpm_buf_append_u32(&buf, 1);
- rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0, NULL);
+ rc = tpm_transmit_cmd(chip, &buf, 0, 0, NULL);
if (!rc) {
out = (struct tpm2_get_cap_out *)
&buf.data[TPM_HEADER_SIZE];
@@ -728,7 +728,7 @@ void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
if (rc)
return;
tpm_buf_append_u16(&buf, shutdown_type);
- tpm_transmit_cmd(chip, NULL, &buf, 0, 0, "stopping the TPM");
+ tpm_transmit_cmd(chip, &buf, 0, 0, "stopping the TPM");
tpm_buf_destroy(&buf);
}

@@ -757,7 +757,7 @@ static int tpm2_do_selftest(struct tpm_chip *chip)
return rc;

tpm_buf_append_u8(&buf, full);
- rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0,
+ rc = tpm_transmit_cmd(chip, &buf, 0, 0,
"attempting the self test");
tpm_buf_destroy(&buf);

@@ -794,7 +794,7 @@ int tpm2_probe(struct tpm_chip *chip)
tpm_buf_append_u32(&buf, TPM2_CAP_TPM_PROPERTIES);
tpm_buf_append_u32(&buf, TPM_PT_TOTAL_COMMANDS);
tpm_buf_append_u32(&buf, 1);
- rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0, NULL);
+ rc = tpm_transmit_cmd(chip, &buf, 0, 0, NULL);
/* We ignore TPM return codes on purpose. */
if (rc >= 0) {
out = (struct tpm_header *)buf.data;
@@ -833,8 +833,7 @@ static ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
tpm_buf_append_u32(&buf, 0);
tpm_buf_append_u32(&buf, 1);

- rc = tpm_transmit_cmd(chip, NULL, &buf, 9, 0,
- "get tpm pcr allocation");
+ rc = tpm_transmit_cmd(chip, &buf, 9, 0, "get tpm pcr allocation");
if (rc)
goto out;

@@ -905,7 +904,7 @@ static int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip)
tpm_buf_append_u32(&buf, TPM2_CC_FIRST);
tpm_buf_append_u32(&buf, nr_commands);

- rc = tpm_transmit_cmd(chip, NULL, &buf, 9 + 4 * nr_commands, 0, NULL);
+ rc = tpm_transmit_cmd(chip, &buf, 9 + 4 * nr_commands, 0, NULL);
if (rc) {
tpm_buf_destroy(&buf);
goto out;
@@ -962,8 +961,7 @@ static int tpm2_startup(struct tpm_chip *chip)
return rc;

tpm_buf_append_u16(&buf, TPM2_SU_CLEAR);
- rc = tpm_transmit_cmd(chip, NULL, &buf, 0, 0,
- "attempting to start the TPM");
+ rc = tpm_transmit_cmd(chip, &buf, 0, 0, "attempting to start the TPM");
tpm_buf_destroy(&buf);

return rc;
diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
index 9c009db15f88..d1c371db1ab7 100644
--- a/drivers/char/tpm/tpm2-space.c
+++ b/drivers/char/tpm/tpm2-space.c
@@ -83,8 +83,7 @@ static int tpm2_load_context(struct tpm_chip *chip, u8 *buf,
body_size = sizeof(*ctx) + be16_to_cpu(ctx->blob_size);
tpm_buf_append(&tbuf, &buf[*offset], body_size);

- rc = tpm_transmit_cmd(chip, NULL, &tbuf, 4,
- TPM_TRANSMIT_UNLOCKED, NULL);
+ rc = tpm_transmit_cmd(chip, &tbuf, 4, TPM_TRANSMIT_UNLOCKED, NULL);
if (rc < 0) {
dev_warn(&chip->dev, "%s: failed with a system error %d\n",
__func__, rc);
@@ -132,8 +131,7 @@ static int tpm2_save_context(struct tpm_chip *chip, u32 handle, u8 *buf,

tpm_buf_append_u32(&tbuf, handle);

- rc = tpm_transmit_cmd(chip, NULL, &tbuf, 0,
- TPM_TRANSMIT_UNLOCKED, NULL);
+ rc = tpm_transmit_cmd(chip, &tbuf, 0, TPM_TRANSMIT_UNLOCKED, NULL);
if (rc < 0) {
dev_warn(&chip->dev, "%s: failed with a system error %d\n",
__func__, rc);
diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c
index 28eb5ab15b99..e8a1da2810a9 100644
--- a/drivers/char/tpm/tpm_vtpm_proxy.c
+++ b/drivers/char/tpm/tpm_vtpm_proxy.c
@@ -417,7 +417,7 @@ static int vtpm_proxy_request_locality(struct tpm_chip *chip, int locality)

proxy_dev->state |= STATE_DRIVER_COMMAND;

- rc = tpm_transmit_cmd(chip, NULL, &buf, 0, TPM_TRANSMIT_NESTED,
+ rc = tpm_transmit_cmd(chip, &buf, 0, TPM_TRANSMIT_NESTED,
"attempting to set locality");

proxy_dev->state &= ~STATE_DRIVER_COMMAND;

Next message: Peter Huewe: "Re: [PATCH v4 4/6] tpm: modify tpm_pcr_read() definition to pass a TPM hash algorithm"
Previous message: Borislav Petkov: "Re: [PATCH v5 5/8] ARM: l2x0: add marvell,ecc-enable property for aurora"
In reply to: Jarkko Sakkinen: "[PATCH v5 12/17] tpm: remove @space from tpm_transmit()"
Next in thread: Jarkko Sakkinen: "[PATCH v5 13/17] tpm: use tpm_try_get_ops() in tpm-sysfs.c."
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