From patchwork Mon Apr 29 20:27:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Bottomley X-Patchwork-Id: 13647677 Received: from bedivere.hansenpartnership.com (bedivere.hansenpartnership.com [96.44.175.130]) (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 1A88613AD2F; Mon, 29 Apr 2024 20:29:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=96.44.175.130 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714422560; cv=none; b=f1aXZ8OkxBivJikpisc3AMCjMOV5w0d2GmpuvGxedCplD9DxYauje/XfBPAK3bCkNvvUavAWXXUuD7WNLwcoX3OwM3dviK2u3Fe+1dGvHsssyR1dQ1yr2TvtimXIwvtsUoNINl9HDVkpuH04VHJ8FG3J61Tm/+2KoXh+IDzQTuw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714422560; c=relaxed/simple; bh=GhlA/Rq82/QUrouorinlF9Wm+3ULLc25ENkn8rx/tUg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=qUIRyD4xwwy18gu/GCgtfX88TiLs60VKswWiSvRBbf9m5ZxOtxf/OWBxKlnqSvG52iz2ZoHSYVCkx535LR5AGqIXrw6XbCVnvMgFsEWUUCA8alCMM4P3fI6qnFauJ35+5jMN5QgeyClLbtz+q61xQky6gRsifci9wO3Je1Q+pEA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=HansenPartnership.com; spf=pass smtp.mailfrom=HansenPartnership.com; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b=xZOLgkXw; arc=none smtp.client-ip=96.44.175.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="xZOLgkXw" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1714422558; bh=GhlA/Rq82/QUrouorinlF9Wm+3ULLc25ENkn8rx/tUg=; h=From:To:Subject:Date:Message-Id:In-Reply-To:References:From; b=xZOLgkXwqhr4spcMDc5Tq1za5rFz1FV4fDdNYg+ijI7P9PtnlOgTjVvAuPJRq82mi OhcrTIOk09+mJ9ocxX+jb8laKZhvbk4d7obuBZcL6JlushSgyy6rhTJhsn1pMffQo5 llrXrakebjA8rcf8IIKzRQTNvH4ZIgEYcFDFqhQo= Received: from localhost (localhost [127.0.0.1]) by bedivere.hansenpartnership.com (Postfix) with ESMTP id 8CB541281D87; Mon, 29 Apr 2024 16:29:18 -0400 (EDT) Received: from bedivere.hansenpartnership.com ([127.0.0.1]) by localhost (bedivere.hansenpartnership.com [127.0.0.1]) (amavis, port 10024) with ESMTP id SHoqPGxA2FRk; Mon, 29 Apr 2024 16:29:18 -0400 (EDT) Received: from lingrow.int.hansenpartnership.com (unknown [153.66.160.227]) by bedivere.hansenpartnership.com (Postfix) with ESMTP id F298D12819F3; Mon, 29 Apr 2024 16:29:17 -0400 (EDT) From: James Bottomley To: linux-integrity@vger.kernel.org Cc: Jarkko Sakkinen , keyrings@vger.kernel.org, Ard Biesheuvel Subject: [PATCH v8 06/22] tpm: TPM2B formatted buffers Date: Mon, 29 Apr 2024 16:27:55 -0400 Message-Id: <20240429202811.13643-7-James.Bottomley@HansenPartnership.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240429202811.13643-1-James.Bottomley@HansenPartnership.com> References: <20240429202811.13643-1-James.Bottomley@HansenPartnership.com> Precedence: bulk X-Mailing-List: keyrings@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Jarkko Sakkinen Declare tpm_buf_init_sized() and tpm_buf_reset_sized() for creating TPM2B formatted buffers. These buffers are also known as sized buffers in the specifications and literature. Signed-off-by: Jarkko Sakkinen Signed-off-by: James Bottomley --- drivers/char/tpm/tpm-buf.c | 38 +++++++++++++++++++++++++++++++++++--- include/linux/tpm.h | 4 ++++ 2 files changed, 39 insertions(+), 3 deletions(-) diff --git a/drivers/char/tpm/tpm-buf.c b/drivers/char/tpm/tpm-buf.c index 3f39893f3bb1..099b4a56c5d5 100644 --- a/drivers/char/tpm/tpm-buf.c +++ b/drivers/char/tpm/tpm-buf.c @@ -47,6 +47,36 @@ void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal) } EXPORT_SYMBOL_GPL(tpm_buf_reset); +/** + * tpm_buf_init_sized() - Allocate and initialize a sized (TPM2B) buffer + * @buf: A @tpm_buf + * + * Return: 0 or -ENOMEM + */ +int tpm_buf_init_sized(struct tpm_buf *buf) +{ + buf->data = (u8 *)__get_free_page(GFP_KERNEL); + if (!buf->data) + return -ENOMEM; + + tpm_buf_reset_sized(buf); + return 0; +} +EXPORT_SYMBOL_GPL(tpm_buf_init_sized); + +/** + * tpm_buf_reset_sized() - Initialize a sized buffer + * @buf: A &tpm_buf + */ +void tpm_buf_reset_sized(struct tpm_buf *buf) +{ + buf->flags = TPM_BUF_TPM2B; + buf->length = 2; + buf->data[0] = 0; + buf->data[1] = 0; +} +EXPORT_SYMBOL_GPL(tpm_buf_reset_sized); + void tpm_buf_destroy(struct tpm_buf *buf) { free_page((unsigned long)buf->data); @@ -72,8 +102,6 @@ EXPORT_SYMBOL_GPL(tpm_buf_length); */ void tpm_buf_append(struct tpm_buf *buf, const u8 *new_data, u16 new_length) { - struct tpm_header *head = (struct tpm_header *)buf->data; - /* Return silently if overflow has already happened. */ if (buf->flags & TPM_BUF_OVERFLOW) return; @@ -86,7 +114,11 @@ void tpm_buf_append(struct tpm_buf *buf, const u8 *new_data, u16 new_length) memcpy(&buf->data[buf->length], new_data, new_length); buf->length += new_length; - head->length = cpu_to_be32(buf->length); + + if (buf->flags & TPM_BUF_TPM2B) + ((__be16 *)buf->data)[0] = cpu_to_be16(buf->length - 2); + else + ((struct tpm_header *)buf->data)->length = cpu_to_be32(buf->length); } EXPORT_SYMBOL_GPL(tpm_buf_append); diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 1d7b39b5c383..715db4a91c1f 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -300,6 +300,8 @@ struct tpm_header { enum tpm_buf_flags { /* the capacity exceeded: */ TPM_BUF_OVERFLOW = BIT(0), + /* TPM2B format: */ + TPM_BUF_TPM2B = BIT(1), }; /* @@ -328,6 +330,8 @@ struct tpm2_hash { int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal); void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal); +int tpm_buf_init_sized(struct tpm_buf *buf); +void tpm_buf_reset_sized(struct tpm_buf *buf); void tpm_buf_destroy(struct tpm_buf *buf); u32 tpm_buf_length(struct tpm_buf *buf); void tpm_buf_append(struct tpm_buf *buf, const u8 *new_data, u16 new_length);