From nobody Tue Dec 16 23:57:51 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 981DC7260F; Wed, 10 Dec 2025 17:21:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765387263; cv=none; b=m7/7C8fDKb1xz8+nBiQ432Jof4AgA97dluxVlgFFcB25c5jqo3PHPPcvuKGr9VmLQb+SmZzuZacDdT1yHLcNGF03nXb3gZN5A5+XC9XsUfHFCOSBoDuE9wyfc5Td/WrdqXrQrnjVGe6IG7klCa3epDSWV+/gmn4JYzuNlmmYN/Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765387263; c=relaxed/simple; bh=WJPWwhEnL9cZ2qZj1SQCBIP02Hql/+FLIpMhmf94jhE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=rITwgRIEpp7NWuVQW9FmxY1th72j1HFwSYEwkdRk5dSJv7WM1MI7GVknLNzM6TszGI+3U3CCYyV/sNI0HprLanSRdvpKPHLxCw2HgmKRAZA/I5Gb3Dbqgw5b5V9UArDXZb89bfevRMDOFCyyNJmAK+8MnKKi4i7RK9rs5aQtOmE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cHP4LWfc; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="cHP4LWfc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B2154C4CEF1; Wed, 10 Dec 2025 17:21:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1765387263; bh=WJPWwhEnL9cZ2qZj1SQCBIP02Hql/+FLIpMhmf94jhE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cHP4LWfcicVy/gvHLfmB7NL/c1tbUhavAXLFNl0zdqaYSTqUww2OHLWK9IpxCh45K SGWcIcibikDaWqq3OgOQNbpHdoICfCge/IPeM6Bchqt/CU5vXow/200HqWT5y79+Lp 5MZvgtULICbxZgdS2EC88Os9rlF1QAYPmuwEyNUPOIGD5qKScbImavroNd2Z49/Ol9 ac7YXT3J5jY7WD9CddsFe4odi25LRlP3KrRcH8rylrTIlhRvHoajxXhswZNnGaqKxs uATnL+u7Ji2IrQaiyFLpRpy8osfoo+QFaQAmJSeZ0Bq/FWEXdpxeLlNMSt6IKx4Hc4 Zrnd9LAqtBPjw== From: Jarkko Sakkinen To: linux-integrity@vger.kernel.org Cc: Jarkko Sakkinen , Peter Huewe , Jason Gunthorpe , David Howells , Paul Moore , James Morris , "Serge E. Hallyn" , linux-kernel@vger.kernel.org (open list), keyrings@vger.kernel.org (open list:KEYS/KEYRINGS), linux-security-module@vger.kernel.org (open list:SECURITY SUBSYSTEM) Subject: [PATCH v4 5/8] tpm-buf: Remove tpm_buf_append_handle Date: Wed, 10 Dec 2025 19:20:23 +0200 Message-Id: <20251210172027.109938-6-jarkko@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20251210172027.109938-1-jarkko@kernel.org> References: <20251210172027.109938-1-jarkko@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Since the number of handles is fixed to a single handle, eliminate all uses of buf->handles and deduce values during compile-time. Signed-off-by: Jarkko Sakkinen --- v2: - Streamline the code change and remove dead code. --- drivers/char/tpm/tpm-buf.c | 25 ------------------------- drivers/char/tpm/tpm2-cmd.c | 6 ++---- drivers/char/tpm/tpm2-sessions.c | 14 ++------------ include/linux/tpm.h | 2 -- 4 files changed, 4 insertions(+), 43 deletions(-) diff --git a/drivers/char/tpm/tpm-buf.c b/drivers/char/tpm/tpm-buf.c index 73be8a87b472..752c69b8a4f5 100644 --- a/drivers/char/tpm/tpm-buf.c +++ b/drivers/char/tpm/tpm-buf.c @@ -40,7 +40,6 @@ static void __tpm_buf_reset(struct tpm_buf *buf, u16 buf_= size, u16 tag, u32 ordi buf->flags =3D 0; buf->length =3D sizeof(*head); buf->capacity =3D buf_size - sizeof(*buf); - buf->handles =3D 0; head->tag =3D cpu_to_be16(tag); head->length =3D cpu_to_be32(sizeof(*head)); head->ordinal =3D cpu_to_be32(ordinal); @@ -56,7 +55,6 @@ static void __tpm_buf_reset_sized(struct tpm_buf *buf, u1= 6 buf_size) buf->flags =3D TPM_BUF_TPM2B; buf->length =3D 2; buf->capacity =3D buf_size - sizeof(*buf); - buf->handles =3D 0; buf->data[0] =3D 0; buf->data[1] =3D 0; } @@ -177,29 +175,6 @@ void tpm_buf_append_u32(struct tpm_buf *buf, const u32= value) } EXPORT_SYMBOL_GPL(tpm_buf_append_u32); =20 -/** - * tpm_buf_append_handle() - Add a handle - * @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_buf *buf, u32 handle) -{ - if (buf->flags & TPM_BUF_INVALID) - return; - - if (buf->flags & TPM_BUF_TPM2B) { - WARN(1, "tpm-buf: invalid type: TPM2B\n"); - buf->flags |=3D TPM_BUF_INVALID; - return; - } - - tpm_buf_append_u32(buf, handle); - buf->handles++; -} - /** * tpm_buf_read() - Read from a TPM buffer * @buf: &tpm_buf instance diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index 436ee82620e4..bc50d6b734cf 100644 --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -205,7 +205,7 @@ int tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, return rc; tpm_buf_append_hmac_session(chip, buf, 0, NULL, 0); } else { - tpm_buf_append_handle(buf, pcr_idx); + tpm_buf_append_u32(buf, pcr_idx); tpm_buf_append_auth(chip, buf, NULL, 0); } =20 @@ -281,10 +281,8 @@ int tpm2_get_random(struct tpm_chip *chip, u8 *dest, s= ize_t max) TPM2_SA_CONTINUE_SESSION, NULL, 0); } else { - offset =3D buf->handles * 4 + TPM_HEADER_SIZE; head =3D (struct tpm_header *)buf->data; - if (tpm_buf_length(buf) =3D=3D offset) - head->tag =3D cpu_to_be16(TPM2_ST_NO_SESSIONS); + head->tag =3D cpu_to_be16(TPM2_ST_NO_SESSIONS); } tpm_buf_append_u16(buf, num_bytes); err =3D tpm_buf_fill_hmac_session(chip, buf); diff --git a/drivers/char/tpm/tpm2-sessions.c b/drivers/char/tpm/tpm2-sessi= ons.c index 62a200ae72d7..f2b8ca893e15 100644 --- a/drivers/char/tpm/tpm2-sessions.c +++ b/drivers/char/tpm/tpm2-sessions.c @@ -261,7 +261,7 @@ int tpm_buf_append_name(struct tpm_chip *chip, struct t= pm_buf *buf, } =20 if (!tpm2_chip_auth(chip)) { - tpm_buf_append_handle(buf, handle); + tpm_buf_append_u32(buf, handle); return 0; } =20 @@ -288,17 +288,7 @@ EXPORT_SYMBOL_GPL(tpm_buf_append_name); void tpm_buf_append_auth(struct tpm_chip *chip, struct tpm_buf *buf, u8 *passphrase, int passphrase_len) { - /* offset tells us where the sessions area begins */ - int offset =3D buf->handles * 4 + TPM_HEADER_SIZE; - u32 len =3D 9 + passphrase_len; - - if (tpm_buf_length(buf) !=3D offset) { - /* not the first session so update the existing length */ - len +=3D get_unaligned_be32(&buf->data[offset]); - put_unaligned_be32(len, &buf->data[offset]); - } else { - tpm_buf_append_u32(buf, len); - } + tpm_buf_append_u32(buf, 9 + passphrase_len); /* auth handle */ tpm_buf_append_u32(buf, TPM2_RS_PW); /* nonce */ diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 9f684fc7ae04..e68995df8796 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -395,7 +395,6 @@ enum tpm_buf_flags { */ struct tpm_buf { u8 flags; - u8 handles; u16 length; u16 capacity; u8 data[]; @@ -441,7 +440,6 @@ 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_buf *buf, u32 handle); =20 /* * Check if TPM device is in the firmware upgrade mode. --=20 2.39.5