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Message-Id: <20180228195819.22231-6-jarkko.sakkinen@linux.intel.com>
Date: Wed, 28 Feb 2018 21:58:18 +0200
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: linux-integrity@...r.kernel.org
Cc: linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
Peter Huewe <peterhuewe@....de>,
Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 5/5] tpm: migrate tpm2_get_random() to use struct tpm_buf
In order to make struct tpm_buf the first class object for constructing
TPM commands, migrate tpm2_get_random() to use it. In addition, removed
remaining references to struct tpm2_cmd. All of them use it to acquire
the length of the response, which can be achieved by using
tpm_buf_length().
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
drivers/char/tpm/tpm.h | 2 +-
drivers/char/tpm/tpm2-cmd.c | 87 ++++++++++++++++-----------------------------
2 files changed, 31 insertions(+), 58 deletions(-)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index cccd5994a0e1..cffb71ec0289 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -557,7 +557,7 @@ static inline u32 tpm2_rc_value(u32 rc)
int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
struct tpm2_digest *digests);
-int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
+int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max);
void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
unsigned int flags);
int tpm2_seal_trusted(struct tpm_chip *chip,
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 43791947b8e1..574caa33aab3 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -27,25 +27,6 @@ enum tpm2_session_attributes {
TPM2_SA_CONTINUE_SESSION = BIT(0),
};
-struct tpm2_get_random_in {
- __be16 size;
-} __packed;
-
-struct tpm2_get_random_out {
- __be16 size;
- u8 buffer[TPM_MAX_RNG_DATA];
-} __packed;
-
-union tpm2_cmd_params {
- struct tpm2_get_random_in getrandom_in;
- struct tpm2_get_random_out getrandom_out;
-};
-
-struct tpm2_cmd {
- tpm_cmd_header header;
- union tpm2_cmd_params params;
-} __packed;
-
struct tpm2_hash {
unsigned int crypto_id;
unsigned int tpm_id;
@@ -298,62 +279,58 @@ int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
}
-#define TPM2_GETRANDOM_IN_SIZE \
- (sizeof(struct tpm_input_header) + \
- sizeof(struct tpm2_get_random_in))
-
-static const struct tpm_input_header tpm2_getrandom_header = {
- .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
- .length = cpu_to_be32(TPM2_GETRANDOM_IN_SIZE),
- .ordinal = cpu_to_be32(TPM2_CC_GET_RANDOM)
-};
+struct tpm2_get_random_out {
+ __be16 size;
+ u8 buffer[TPM_MAX_RNG_DATA];
+} __packed;
/**
* tpm2_get_random() - get random bytes from the TPM RNG
*
* @chip: TPM chip to use
- * @out: destination buffer for the random bytes
+ * @dest: destination buffer for the random bytes
* @max: the max number of bytes to write to @out
*
* Return:
- * Size of the output buffer, or -EIO on error.
+ * size of the output buffer when the operation is successful.
+ * A negative number for system errors (errno).
*/
-int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max)
+int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max)
{
- struct tpm2_cmd cmd;
- u32 recd, rlength;
- u32 num_bytes;
+ struct tpm2_get_random_out *out;
+ struct tpm_buf buf;
+ u32 recd;
+ u32 num_bytes = max;
int err;
int total = 0;
int retries = 5;
- u8 *dest = out;
+ u8 *dest_ptr = dest;
- num_bytes = min_t(u32, max, sizeof(cmd.params.getrandom_out.buffer));
-
- if (!out || !num_bytes ||
- max > sizeof(cmd.params.getrandom_out.buffer))
+ if (!num_bytes || max > TPM_MAX_RNG_DATA)
return -EINVAL;
do {
- cmd.header.in = tpm2_getrandom_header;
- cmd.params.getrandom_in.size = cpu_to_be16(num_bytes);
-
- err = tpm_transmit_cmd(chip, NULL, &cmd, sizeof(cmd),
+ err = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS,
+ TPM2_CC_GET_RANDOM);
+ if (err)
+ return err;
+ tpm_buf_append_u16(&buf, num_bytes);
+ err = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE,
offsetof(struct tpm2_get_random_out,
buffer),
0, "attempting get random");
if (err)
break;
- recd = min_t(u32, be16_to_cpu(cmd.params.getrandom_out.size),
- num_bytes);
- rlength = be32_to_cpu(cmd.header.out.length);
- if (rlength < offsetof(struct tpm2_get_random_out, buffer) +
- recd)
+ out = (struct tpm2_get_random_out *)
+ &buf.data[TPM_HEADER_SIZE];
+ recd = min_t(u32, be16_to_cpu(out->size), num_bytes);
+ if (tpm_buf_length(&buf) <
+ offsetof(struct tpm2_get_random_out, buffer) + recd)
return -EFAULT;
- memcpy(dest, cmd.params.getrandom_out.buffer, recd);
+ memcpy(dest_ptr, out->buffer, recd);
- dest += recd;
+ dest_ptr += recd;
total += recd;
num_bytes -= recd;
} while (retries-- && total < max);
@@ -435,7 +412,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
{
unsigned int blob_len;
struct tpm_buf buf;
- u32 hash, rlength;
+ u32 hash;
int i;
int rc;
@@ -510,8 +487,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
rc = -E2BIG;
goto out;
}
- rlength = be32_to_cpu(((struct tpm2_cmd *)&buf)->header.out.length);
- if (rlength < TPM_HEADER_SIZE + 4 + blob_len) {
+ if (tpm_buf_length(&buf) < TPM_HEADER_SIZE + 4 + blob_len) {
rc = -EFAULT;
goto out;
}
@@ -621,7 +597,6 @@ static int tpm2_unseal_cmd(struct tpm_chip *chip,
u16 data_len;
u8 *data;
int rc;
- u32 rlength;
rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_UNSEAL);
if (rc)
@@ -649,9 +624,7 @@ static int tpm2_unseal_cmd(struct tpm_chip *chip,
goto out;
}
- rlength = be32_to_cpu(((struct tpm2_cmd *)&buf)
- ->header.out.length);
- if (rlength < TPM_HEADER_SIZE + 6 + data_len) {
+ if (tpm_buf_length(&buf) < TPM_HEADER_SIZE + 6 + data_len) {
rc = -EFAULT;
goto out;
}
--
2.15.1
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