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-rw-r--r--security/keys/trusted.c54
1 files changed, 12 insertions, 42 deletions
diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index 2d5d041f2049..3f163d0489ad 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -369,38 +369,6 @@ static int trusted_tpm_send(const u32 chip_num, unsigned char *cmd,
}
/*
- * get a random value from TPM
- */
-static int tpm_get_random(struct tpm_buf *tb, unsigned char *buf, uint32_t len)
-{
- int ret;
-
- INIT_BUF(tb);
- store16(tb, TPM_TAG_RQU_COMMAND);
- store32(tb, TPM_GETRANDOM_SIZE);
- store32(tb, TPM_ORD_GETRANDOM);
- store32(tb, len);
- ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, sizeof tb->data);
- if (!ret)
- memcpy(buf, tb->data + TPM_GETRANDOM_SIZE, len);
- return ret;
-}
-
-static int my_get_random(unsigned char *buf, int len)
-{
- struct tpm_buf *tb;
- int ret;
-
- tb = kmalloc(sizeof *tb, GFP_KERNEL);
- if (!tb)
- return -ENOMEM;
- ret = tpm_get_random(tb, buf, len);
-
- kfree(tb);
- return ret;
-}
-
-/*
* Lock a trusted key, by extending a selected PCR.
*
* Prevents a trusted key that is sealed to PCRs from being accessed.
@@ -413,8 +381,8 @@ static int pcrlock(const int pcrnum)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- ret = my_get_random(hash, SHA1_DIGEST_SIZE);
- if (ret < 0)
+ ret = tpm_get_random(TPM_ANY_NUM, hash, SHA1_DIGEST_SIZE);
+ if (ret != SHA1_DIGEST_SIZE)
return ret;
return tpm_pcr_extend(TPM_ANY_NUM, pcrnum, hash) ? -EINVAL : 0;
}
@@ -429,8 +397,8 @@ static int osap(struct tpm_buf *tb, struct osapsess *s,
unsigned char ononce[TPM_NONCE_SIZE];
int ret;
- ret = tpm_get_random(tb, ononce, TPM_NONCE_SIZE);
- if (ret < 0)
+ ret = tpm_get_random(TPM_ANY_NUM, ononce, TPM_NONCE_SIZE);
+ if (ret != TPM_NONCE_SIZE)
return ret;
INIT_BUF(tb);
@@ -524,8 +492,8 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
if (ret < 0)
goto out;
- ret = tpm_get_random(tb, td->nonceodd, TPM_NONCE_SIZE);
- if (ret < 0)
+ ret = tpm_get_random(TPM_ANY_NUM, td->nonceodd, TPM_NONCE_SIZE);
+ if (ret != TPM_NONCE_SIZE)
goto out;
ordinal = htonl(TPM_ORD_SEAL);
datsize = htonl(datalen);
@@ -634,8 +602,8 @@ static int tpm_unseal(struct tpm_buf *tb,
ordinal = htonl(TPM_ORD_UNSEAL);
keyhndl = htonl(SRKHANDLE);
- ret = tpm_get_random(tb, nonceodd, TPM_NONCE_SIZE);
- if (ret < 0) {
+ ret = tpm_get_random(TPM_ANY_NUM, nonceodd, TPM_NONCE_SIZE);
+ if (ret != TPM_NONCE_SIZE) {
pr_info("trusted_key: tpm_get_random failed (%d)\n", ret);
return ret;
}
@@ -935,6 +903,7 @@ static int trusted_instantiate(struct key *key, const void *data,
char *datablob;
int ret = 0;
int key_cmd;
+ size_t key_len;
if (datalen <= 0 || datalen > 32767 || !data)
return -EINVAL;
@@ -974,8 +943,9 @@ static int trusted_instantiate(struct key *key, const void *data,
pr_info("trusted_key: key_unseal failed (%d)\n", ret);
break;
case Opt_new:
- ret = my_get_random(payload->key, payload->key_len);
- if (ret < 0) {
+ key_len = payload->key_len;
+ ret = tpm_get_random(TPM_ANY_NUM, payload->key, key_len);
+ if (ret != key_len) {
pr_info("trusted_key: key_create failed (%d)\n", ret);
goto out;
}