KEYS: trusted tpmdd-queue on 20210423

Fix a regression in the TPM trusted keys caused by the generic rework
 to add ARM TEE based trusted keys.  Without this fix, the TPM trusted
 key subsystem fails to add or load any keys.
 
 Signed-off-by: James E.J. Bottomley <jejb@linux.ibm.com>
 -----BEGIN PGP SIGNATURE-----
 
 iJwEABMIAEQWIQTnYEDbdso9F2cI+arnQslM7pishQUCYINO/CYcamFtZXMuYm90
 dG9tbGV5QGhhbnNlbnBhcnRuZXJzaGlwLmNvbQAKCRDnQslM7pishYvuAP418ooC
 6CeoWs/GLXchG/Do412JBLuPJBg3BOrXqUqMTQD/TmfcbQ8r+WRmuaVsweptQhKx
 7IYnETpAGgP7fGh4Dss=
 =gvsH
 -----END PGP SIGNATURE-----

Merge tag 'queue' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/tpmdd

Pull tpm fixes from James Bottomley:
 "Fix a regression in the TPM trusted keys caused by the generic rework
  to add ARM TEE based trusted keys.

  Without this fix, the TPM trusted key subsystem fails to add or load
  any keys"

* tag 'queue' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/tpmdd:
  KEYS: trusted: fix TPM trusted keys for generic framework

security/keys/trusted-keys/trusted_core.c

@@ -62,7 +62,7 @@ static const match_table_t key_tokens = {
  *
  * On success returns 0, otherwise -EINVAL.
  */
-static int datablob_parse(char *datablob, struct trusted_key_payload *p)
+static int datablob_parse(char **datablob, struct trusted_key_payload *p)
 {
 	substring_t args[MAX_OPT_ARGS];
 	long keylen;
@@ -71,14 +71,14 @@ static int datablob_parse(char *datablob, struct trusted_key_payload *p)
 	char *c;
 
 	/* main command */
-	c = strsep(&datablob, " \t");
+	c = strsep(datablob, " \t");
 	if (!c)
 		return -EINVAL;
 	key_cmd = match_token(c, key_tokens, args);
 	switch (key_cmd) {
 	case Opt_new:
 		/* first argument is key size */
-		c = strsep(&datablob, " \t");
+		c = strsep(datablob, " \t");
 		if (!c)
 			return -EINVAL;
 		ret = kstrtol(c, 10, &keylen);
@@ -89,7 +89,7 @@ static int datablob_parse(char *datablob, struct trusted_key_payload *p)
 		break;
 	case Opt_load:
 		/* first argument is sealed blob */
-		c = strsep(&datablob, " \t");
+		c = strsep(datablob, " \t");
 		if (!c)
 			return -EINVAL;
 		p->blob_len = strlen(c) / 2;
@@ -140,7 +140,7 @@ static int trusted_instantiate(struct key *key,
 {
 	struct trusted_key_payload *payload = NULL;
 	size_t datalen = prep->datalen;
-	char *datablob;
+	char *datablob, *orig_datablob;
 	int ret = 0;
 	int key_cmd;
 	size_t key_len;
@@ -148,7 +148,7 @@ static int trusted_instantiate(struct key *key,
 	if (datalen <= 0 || datalen > 32767 || !prep->data)
 		return -EINVAL;
 
-	datablob = kmalloc(datalen + 1, GFP_KERNEL);
+	orig_datablob = datablob = kmalloc(datalen + 1, GFP_KERNEL);
 	if (!datablob)
 		return -ENOMEM;
 	memcpy(datablob, prep->data, datalen);
@@ -160,7 +160,7 @@ static int trusted_instantiate(struct key *key,
 		goto out;
 	}
 
-	key_cmd = datablob_parse(datablob, payload);
+	key_cmd = datablob_parse(&datablob, payload);
 	if (key_cmd < 0) {
 		ret = key_cmd;
 		goto out;
@@ -196,7 +196,7 @@ static int trusted_instantiate(struct key *key,
 		ret = -EINVAL;
 	}
 out:
-	kfree_sensitive(datablob);
+	kfree_sensitive(orig_datablob);
 	if (!ret)
 		rcu_assign_keypointer(key, payload);
 	else
@@ -220,7 +220,7 @@ static int trusted_update(struct key *key, struct key_preparsed_payload *prep)
 	struct trusted_key_payload *p;
 	struct trusted_key_payload *new_p;
 	size_t datalen = prep->datalen;
-	char *datablob;
+	char *datablob, *orig_datablob;
 	int ret = 0;
 
 	if (key_is_negative(key))
@@ -231,7 +231,7 @@ static int trusted_update(struct key *key, struct key_preparsed_payload *prep)
 	if (datalen <= 0 || datalen > 32767 || !prep->data)
 		return -EINVAL;
 
-	datablob = kmalloc(datalen + 1, GFP_KERNEL);
+	orig_datablob = datablob = kmalloc(datalen + 1, GFP_KERNEL);
 	if (!datablob)
 		return -ENOMEM;
 
@@ -243,7 +243,7 @@ static int trusted_update(struct key *key, struct key_preparsed_payload *prep)
 
 	memcpy(datablob, prep->data, datalen);
 	datablob[datalen] = '\0';
-	ret = datablob_parse(datablob, new_p);
+	ret = datablob_parse(&datablob, new_p);
 	if (ret != Opt_update) {
 		ret = -EINVAL;
 		kfree_sensitive(new_p);
@@ -267,7 +267,7 @@ static int trusted_update(struct key *key, struct key_preparsed_payload *prep)
 	rcu_assign_keypointer(key, new_p);
 	call_rcu(&p->rcu, trusted_rcu_free);
 out:
-	kfree_sensitive(datablob);
+	kfree_sensitive(orig_datablob);
 	return ret;
 }
 

security/keys/trusted-keys/trusted_tpm1.c

@@ -747,6 +747,9 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
 
 	opt->hash = tpm2 ? HASH_ALGO_SHA256 : HASH_ALGO_SHA1;
 
+	if (!c)
+		return 0;
+
 	while ((p = strsep(&c, " \t"))) {
 		if (*p == '\0' || *p == ' ' || *p == '\t')
 			continue;
@@ -944,7 +947,7 @@ static int trusted_tpm_unseal(struct trusted_key_payload *p, char *datablob)
 		goto out;
 	dump_options(options);
 
-	if (!options->keyhandle) {
+	if (!options->keyhandle && !tpm2) {
 		ret = -EINVAL;
 		goto out;
 	}