linux-kernel - [PATCH v6 09/10] tpm-buf: Remove chip parameter from tpm_buf_append

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20251018111725.3116386-10-jarkko@kernel.org>
Date: Sat, 18 Oct 2025 14:17:24 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: linux-integrity@...r.kernel.org
Cc: keyring@...r.kernel.org,
	dpsmith@...rtussolutions.com,
	ross.philipson@...cle.com,
	Jonathan McDowell <noodles@...th.li>,
	Roberto Sassu <roberto.sassu@...wei.com>,
	Stefano Garzarella <sgarzare@...hat.com>,
	Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>,
	Jonathan McDowell <noodles@...a.com>,
	Peter Huewe <peterhuewe@....de>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Jason Gunthorpe <jgg@...pe.ca>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v6 09/10] tpm-buf: Remove chip parameter from tpm_buf_append_handle

From: Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>

Remove @chip from tpm_buf_append_handle() in order to decouple it from
driver. This allows tpm-buf.c to be compiled as part of early boot code,
thus providing a mechanism to build and parse TPM data.

E.g., Trenchboot can use this to manage TPM2_PcrExtend protocol data as
part of its early boot blob simply by compiling and linking the object
file.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>
Reviewed-by: Jonathan McDowell <noodles@...a.com>
---
v6:
- Rewrote the commit message.
v5:
- No changes.
v4:
- No changes.
v3:
- No changes.
v2:
- No changes.
---
 drivers/char/tpm/tpm-buf.c       | 5 ++---
 drivers/char/tpm/tpm2-cmd.c      | 2 +-
 drivers/char/tpm/tpm2-sessions.c | 2 +-
 include/linux/tpm.h              | 2 +-
 4 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/char/tpm/tpm-buf.c b/drivers/char/tpm/tpm-buf.c
index 69ee77400539..1b9dee0d0681 100644
--- a/drivers/char/tpm/tpm-buf.c
+++ b/drivers/char/tpm/tpm-buf.c
@@ -147,20 +147,19 @@ EXPORT_SYMBOL_GPL(tpm_buf_append_u32);
 
 /**
  * tpm_buf_append_handle() - Add a handle
- * @chip:	&tpm_chip instance
  * @buf:	&tpm_buf instance
  * @handle:	a TPM object handle
  *
  * Add a handle to the buffer, and increase the count tracking the number of
  * handles in the command buffer. Works only for command buffers.
  */
-void tpm_buf_append_handle(struct tpm_chip *chip, struct tpm_buf *buf, u32 handle)
+void tpm_buf_append_handle(struct tpm_buf *buf, u32 handle)
 {
 	if (buf->flags & TPM_BUF_INVALID)
 		return;
 
 	if (buf->flags & TPM_BUF_TPM2B) {
-		dev_err(&chip->dev, "Invalid buffer type (TPM2B)\n");
+		WARN(1, "tpm-buf: invalid type: TPM2B\n");
 		buf->flags |= TPM_BUF_INVALID;
 		return;
 	}
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 254003e5dd8b..e548b0ac7654 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -190,7 +190,7 @@ int tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
 		tpm_buf_append_name(chip, &buf, pcr_idx, NULL);
 		tpm_buf_append_hmac_session(chip, &buf, 0, NULL, 0);
 	} else {
-		tpm_buf_append_handle(chip, &buf, pcr_idx);
+		tpm_buf_append_handle(&buf, pcr_idx);
 		tpm_buf_append_auth(chip, &buf, NULL, 0);
 	}
 
diff --git a/drivers/char/tpm/tpm2-sessions.c b/drivers/char/tpm/tpm2-sessions.c
index 13f019d1312a..bbc05f0997a8 100644
--- a/drivers/char/tpm/tpm2-sessions.c
+++ b/drivers/char/tpm/tpm2-sessions.c
@@ -232,7 +232,7 @@ void tpm_buf_append_name(struct tpm_chip *chip, struct tpm_buf *buf,
 #endif
 
 	if (!tpm2_chip_auth(chip)) {
-		tpm_buf_append_handle(chip, buf, handle);
+		tpm_buf_append_handle(buf, handle);
 		return;
 	}
 
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 3eae22a06558..6ff76a4b8a53 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -426,7 +426,7 @@ void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value);
 u8 tpm_buf_read_u8(struct tpm_buf *buf, off_t *offset);
 u16 tpm_buf_read_u16(struct tpm_buf *buf, off_t *offset);
 u32 tpm_buf_read_u32(struct tpm_buf *buf, off_t *offset);
-void tpm_buf_append_handle(struct tpm_chip *chip, struct tpm_buf *buf, u32 handle);
+void tpm_buf_append_handle(struct tpm_buf *buf, u32 handle);
 
 /*
  * Check if TPM device is in the firmware upgrade mode.
-- 
2.39.5