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Message-ID: <20250731212354.105044-4-ebiggers@kernel.org>
Date: Thu, 31 Jul 2025 14:23:54 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: James Bottomley <James.Bottomley@...senPartnership.com>,
Jarkko Sakkinen <jarkko@...nel.org>,
Mimi Zohar <zohar@...ux.ibm.com>,
keyrings@...r.kernel.org
Cc: David Howells <dhowells@...hat.com>,
linux-integrity@...r.kernel.org,
linux-crypto@...r.kernel.org,
linux-kernel@...r.kernel.org,
Eric Biggers <ebiggers@...nel.org>
Subject: [PATCH 3/3] KEYS: trusted_tpm1: Move private functionality out of public header
Move functionality used only by trusted_tpm1.c out of the public header
<keys/trusted_tpm.h>. Specifically, change the exported functions into
static functions, since they are not used outside trusted_tpm1.c, and
move various other definitions and inline functions to trusted_tpm1.c.
Signed-off-by: Eric Biggers <ebiggers@...nel.org>
---
include/keys/trusted_tpm.h | 79 ----------------------
security/keys/trusted-keys/trusted_tpm1.c | 80 ++++++++++++++++++++---
2 files changed, 72 insertions(+), 87 deletions(-)
diff --git a/include/keys/trusted_tpm.h b/include/keys/trusted_tpm.h
index a088b33fd0e3b..0fadc6a4f1663 100644
--- a/include/keys/trusted_tpm.h
+++ b/include/keys/trusted_tpm.h
@@ -3,94 +3,15 @@
#define __TRUSTED_TPM_H
#include <keys/trusted-type.h>
#include <linux/tpm_command.h>
-/* implementation specific TPM constants */
-#define TPM_SIZE_OFFSET 2
-#define TPM_RETURN_OFFSET 6
-#define TPM_DATA_OFFSET 10
-
-#define LOAD32(buffer, offset) (ntohl(*(uint32_t *)&buffer[offset]))
-#define LOAD32N(buffer, offset) (*(uint32_t *)&buffer[offset])
-#define LOAD16(buffer, offset) (ntohs(*(uint16_t *)&buffer[offset]))
-
extern struct trusted_key_ops trusted_key_tpm_ops;
-struct osapsess {
- uint32_t handle;
- unsigned char secret[SHA1_DIGEST_SIZE];
- unsigned char enonce[TPM_NONCE_SIZE];
-};
-
-/* discrete values, but have to store in uint16_t for TPM use */
-enum {
- SEAL_keytype = 1,
- SRK_keytype = 4
-};
-
-int TSS_authhmac(unsigned char *digest, const unsigned char *key,
- unsigned int keylen, unsigned char *h1,
- unsigned char *h2, unsigned int h3, ...);
-int TSS_checkhmac1(unsigned char *buffer,
- const uint32_t command,
- const unsigned char *ononce,
- const unsigned char *key,
- unsigned int keylen, ...);
-
-int trusted_tpm_send(unsigned char *cmd, size_t buflen);
-int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce);
-
int tpm2_seal_trusted(struct tpm_chip *chip,
struct trusted_key_payload *payload,
struct trusted_key_options *options);
int tpm2_unseal_trusted(struct tpm_chip *chip,
struct trusted_key_payload *payload,
struct trusted_key_options *options);
-#define TPM_DEBUG 0
-
-#if TPM_DEBUG
-static inline void dump_options(struct trusted_key_options *o)
-{
- pr_info("sealing key type %d\n", o->keytype);
- pr_info("sealing key handle %0X\n", o->keyhandle);
- pr_info("pcrlock %d\n", o->pcrlock);
- pr_info("pcrinfo %d\n", o->pcrinfo_len);
- print_hex_dump(KERN_INFO, "pcrinfo ", DUMP_PREFIX_NONE,
- 16, 1, o->pcrinfo, o->pcrinfo_len, 0);
-}
-
-static inline void dump_sess(struct osapsess *s)
-{
- print_hex_dump(KERN_INFO, "trusted-key: handle ", DUMP_PREFIX_NONE,
- 16, 1, &s->handle, 4, 0);
- pr_info("secret:\n");
- print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
- 16, 1, &s->secret, SHA1_DIGEST_SIZE, 0);
- pr_info("trusted-key: enonce:\n");
- print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
- 16, 1, &s->enonce, SHA1_DIGEST_SIZE, 0);
-}
-
-static inline void dump_tpm_buf(unsigned char *buf)
-{
- int len;
-
- pr_info("\ntpm buffer\n");
- len = LOAD32(buf, TPM_SIZE_OFFSET);
- print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, buf, len, 0);
-}
-#else
-static inline void dump_options(struct trusted_key_options *o)
-{
-}
-
-static inline void dump_sess(struct osapsess *s)
-{
-}
-
-static inline void dump_tpm_buf(unsigned char *buf)
-{
-}
-#endif
#endif
diff --git a/security/keys/trusted-keys/trusted_tpm1.c b/security/keys/trusted-keys/trusted_tpm1.c
index 126437459a74d..636acb66a4f69 100644
--- a/security/keys/trusted-keys/trusted_tpm1.c
+++ b/security/keys/trusted-keys/trusted_tpm1.c
@@ -22,10 +22,78 @@
#include <keys/trusted_tpm.h>
static struct tpm_chip *chip;
static struct tpm_digest *digests;
+/* implementation specific TPM constants */
+#define TPM_SIZE_OFFSET 2
+#define TPM_RETURN_OFFSET 6
+#define TPM_DATA_OFFSET 10
+
+#define LOAD32(buffer, offset) (ntohl(*(uint32_t *)&buffer[offset]))
+#define LOAD32N(buffer, offset) (*(uint32_t *)&buffer[offset])
+#define LOAD16(buffer, offset) (ntohs(*(uint16_t *)&buffer[offset]))
+
+struct osapsess {
+ uint32_t handle;
+ unsigned char secret[SHA1_DIGEST_SIZE];
+ unsigned char enonce[TPM_NONCE_SIZE];
+};
+
+/* discrete values, but have to store in uint16_t for TPM use */
+enum {
+ SEAL_keytype = 1,
+ SRK_keytype = 4
+};
+
+#define TPM_DEBUG 0
+
+#if TPM_DEBUG
+static inline void dump_options(struct trusted_key_options *o)
+{
+ pr_info("sealing key type %d\n", o->keytype);
+ pr_info("sealing key handle %0X\n", o->keyhandle);
+ pr_info("pcrlock %d\n", o->pcrlock);
+ pr_info("pcrinfo %d\n", o->pcrinfo_len);
+ print_hex_dump(KERN_INFO, "pcrinfo ", DUMP_PREFIX_NONE,
+ 16, 1, o->pcrinfo, o->pcrinfo_len, 0);
+}
+
+static inline void dump_sess(struct osapsess *s)
+{
+ print_hex_dump(KERN_INFO, "trusted-key: handle ", DUMP_PREFIX_NONE,
+ 16, 1, &s->handle, 4, 0);
+ pr_info("secret:\n");
+ print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
+ 16, 1, &s->secret, SHA1_DIGEST_SIZE, 0);
+ pr_info("trusted-key: enonce:\n");
+ print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
+ 16, 1, &s->enonce, SHA1_DIGEST_SIZE, 0);
+}
+
+static inline void dump_tpm_buf(unsigned char *buf)
+{
+ int len;
+
+ pr_info("\ntpm buffer\n");
+ len = LOAD32(buf, TPM_SIZE_OFFSET);
+ print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, buf, len, 0);
+}
+#else
+static inline void dump_options(struct trusted_key_options *o)
+{
+}
+
+static inline void dump_sess(struct osapsess *s)
+{
+}
+
+static inline void dump_tpm_buf(unsigned char *buf)
+{
+}
+#endif
+
static int TSS_rawhmac(unsigned char *digest, const unsigned char *key,
unsigned int keylen, ...)
{
struct hmac_sha1_ctx hmac_ctx;
va_list argp;
@@ -54,11 +122,11 @@ static int TSS_rawhmac(unsigned char *digest, const unsigned char *key,
}
/*
* calculate authorization info fields to send to TPM
*/
-int TSS_authhmac(unsigned char *digest, const unsigned char *key,
+static int TSS_authhmac(unsigned char *digest, const unsigned char *key,
unsigned int keylen, unsigned char *h1,
unsigned char *h2, unsigned int h3, ...)
{
unsigned char paramdigest[SHA1_DIGEST_SIZE];
struct sha1_ctx sha_ctx;
@@ -92,16 +160,15 @@ int TSS_authhmac(unsigned char *digest, const unsigned char *key,
ret = TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE,
paramdigest, TPM_NONCE_SIZE, h1,
TPM_NONCE_SIZE, h2, 1, &c, 0, 0);
return ret;
}
-EXPORT_SYMBOL_GPL(TSS_authhmac);
/*
* verify the AUTH1_COMMAND (Seal) result from TPM
*/
-int TSS_checkhmac1(unsigned char *buffer,
+static int TSS_checkhmac1(unsigned char *buffer,
const uint32_t command,
const unsigned char *ononce,
const unsigned char *key,
unsigned int keylen, ...)
{
@@ -157,11 +224,10 @@ int TSS_checkhmac1(unsigned char *buffer,
if (crypto_memneq(testhmac, authdata, SHA1_DIGEST_SIZE))
return -EINVAL;
return 0;
}
-EXPORT_SYMBOL_GPL(TSS_checkhmac1);
/*
* verify the AUTH2_COMMAND (unseal) result from TPM
*/
static int TSS_checkhmac2(unsigned char *buffer,
@@ -242,11 +308,11 @@ static int TSS_checkhmac2(unsigned char *buffer,
/*
* For key specific tpm requests, we will generate and send our
* own TPM command packets using the drivers send function.
*/
-int trusted_tpm_send(unsigned char *cmd, size_t buflen)
+static int trusted_tpm_send(unsigned char *cmd, size_t buflen)
{
struct tpm_buf buf;
int rc;
if (!chip)
@@ -268,11 +334,10 @@ int trusted_tpm_send(unsigned char *cmd, size_t buflen)
rc = -EPERM;
tpm_put_ops(chip);
return rc;
}
-EXPORT_SYMBOL_GPL(trusted_tpm_send);
/*
* Lock a trusted key, by extending a selected PCR.
*
* Prevents a trusted key that is sealed to PCRs from being accessed.
@@ -322,11 +387,11 @@ static int osap(struct tpm_buf *tb, struct osapsess *s,
}
/*
* Create an object independent authorisation protocol (oiap) session
*/
-int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce)
+static int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce)
{
int ret;
if (!chip)
return -ENODEV;
@@ -339,11 +404,10 @@ int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce)
*handle = LOAD32(tb->data, TPM_DATA_OFFSET);
memcpy(nonce, &tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)],
TPM_NONCE_SIZE);
return 0;
}
-EXPORT_SYMBOL_GPL(oiap);
struct tpm_digests {
unsigned char encauth[SHA1_DIGEST_SIZE];
unsigned char pubauth[SHA1_DIGEST_SIZE];
unsigned char xorwork[SHA1_DIGEST_SIZE * 2];
--
2.50.1
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