linux-kernel - [PATCH v3 02/11] tpm: Export and rename tpm2_find_and_validate

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Date:   Tue, 27 Sep 2022 09:49:13 -0700
From:   Evan Green <evgreen@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-integrity@...r.kernel.org, apronin@...omium.org,
        dlunev@...gle.com, jarkko@...nel.org, Pavel Machek <pavel@....cz>,
        Ben Boeckel <me@...boeckel.net>, rjw@...ysocki.net,
        corbet@....net, linux-pm@...r.kernel.org, zohar@...ux.ibm.com,
        Kees Cook <keescook@...omium.org>,
        Eric Biggers <ebiggers@...nel.org>, jejb@...ux.ibm.com,
        gwendal@...omium.org, Matthew Garrett <mgarrett@...ora.tech>,
        Evan Green <evgreen@...omium.org>,
        Jason Gunthorpe <jgg@...pe.ca>, Peter Huewe <peterhuewe@....de>
Subject: [PATCH v3 02/11] tpm: Export and rename tpm2_find_and_validate_cc()

Export tpm_find_and_validate_cc() since it will be needed by an upcoming
change allowing access to certain PCRs to be restricted to the kernel.
In order to export it consistently, and because it's a tpm2-only
function, rename it to tpm2_find_and_validate_cc().

Signed-off-by: Evan Green <evgreen@...omium.org>

---

Changes in v3:
 - Split find_and_validate_cc() export to its own patch (Jarkko)
 - Rename tpm_find_and_validate_cc() to tpm2_find_and_validate_cc().

 drivers/char/tpm/tpm.h        | 3 +++
 drivers/char/tpm/tpm2-space.c | 8 ++++----
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 34e20b3192f833..9c9e5d75b37c78 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -232,6 +232,9 @@ int tpm2_find_cc(struct tpm_chip *chip, u32 cc);
 int tpm2_init_space(struct tpm_space *space, unsigned int buf_size);
 void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space);
 void tpm2_flush_space(struct tpm_chip *chip);
+int tpm2_find_and_validate_cc(struct tpm_chip *chip,
+			      struct tpm_space *space,
+			      const void *cmd, size_t len);
 int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u8 *cmd,
 		       size_t cmdsiz);
 int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, void *buf,
diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
index ffb35f0154c16c..ca34cc006e7f8d 100644
--- a/drivers/char/tpm/tpm2-space.c
+++ b/drivers/char/tpm/tpm2-space.c
@@ -262,9 +262,9 @@ static int tpm2_map_command(struct tpm_chip *chip, u32 cc, u8 *cmd)
 	return 0;
 }
 
-static int tpm_find_and_validate_cc(struct tpm_chip *chip,
-				    struct tpm_space *space,
-				    const void *cmd, size_t len)
+int tpm2_find_and_validate_cc(struct tpm_chip *chip,
+			      struct tpm_space *space,
+			      const void *cmd, size_t len)
 {
 	const struct tpm_header *header = (const void *)cmd;
 	int i;
@@ -306,7 +306,7 @@ int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u8 *cmd,
 	if (!space)
 		return 0;
 
-	cc = tpm_find_and_validate_cc(chip, space, cmd, cmdsiz);
+	cc = tpm2_find_and_validate_cc(chip, space, cmd, cmdsiz);
 	if (cc < 0)
 		return cc;
 
-- 
2.31.0