key: add tpm_send command

Add internal kernel tpm_send() command used to seal/unseal keys.

Changelog:
- replaced module_put in tpm_send() with new tpm_chip_put() wrapper
  (suggested by David Howells)
- Make tpm_send() cmd argument a 'void *' (suggested by David Howells)

Signed-off-by: David Safford <safford@watson.ibm.com>
Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: David Howells <dhowells@redhat.com>
Acked-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 26c09f3b4a74..068bac858b4a 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -780,6 +780,22 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
 }
 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
 
+int tpm_send(u32 chip_num, void *cmd, size_t buflen)
+{
+        struct tpm_chip *chip;
+        int rc;
+
+        chip = tpm_chip_find_get(chip_num);
+        if (chip == NULL)
+                return -ENODEV;
+
+        rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
+
+        tpm_chip_put(chip);
+        return rc;
+}
+EXPORT_SYMBOL_GPL(tpm_send);
+
 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
                       char *buf)
 {