From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bedivere.hansenpartnership.com ([66.63.167.143]:49572 "EHLO bedivere.hansenpartnership.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727350AbeJVPw7 (ORCPT ); Mon, 22 Oct 2018 11:52:59 -0400 Message-ID: <1540193734.3202.9.camel@HansenPartnership.com> Subject: [PATCH v4 1/7] tpm-buf: create new functions for handling TPM buffers From: James Bottomley To: linux-integrity@vger.kernel.org Cc: linux-crypto@vger.kernel.org, linux-security-module@vger.kernel.org, Jarkko Sakkinen , Ard Biesheuvel Date: Mon, 22 Oct 2018 08:35:34 +0100 In-Reply-To: <1540193596.3202.7.camel@HansenPartnership.com> References: <1540193596.3202.7.camel@HansenPartnership.com> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-crypto-owner@vger.kernel.org List-ID: This separates out the old tpm_buf_... handling functions from static inlines into tpm.h and makes them their own tpm-buf.c file. It also adds handling for tpm2b structures and also incremental pointer advancing parsers. Signed-off-by: James Bottomley --- v2: added this patch to separate out the API changes v3: added tpm_buf_reset_cmd() v4: renamed tpm_buf_reset_cmd() to tpm_buf_reset() --- drivers/char/tpm/Makefile | 2 +- drivers/char/tpm/tpm-buf.c | 191 +++++++++++++++++++++++++++++++++++++++++++++ drivers/char/tpm/tpm.h | 96 ++++------------------- 3 files changed, 208 insertions(+), 81 deletions(-) create mode 100644 drivers/char/tpm/tpm-buf.c diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile index 3655258bee73..65d165cce530 100644 --- a/drivers/char/tpm/Makefile +++ b/drivers/char/tpm/Makefile @@ -5,7 +5,7 @@ obj-$(CONFIG_TCG_TPM) += tpm.o tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o \ tpm-dev-common.o tpmrm-dev.o eventlog/common.o eventlog/tpm1.o \ - eventlog/tpm2.o tpm2-space.o + eventlog/tpm2.o tpm2-space.o tpm-buf.o tpm-$(CONFIG_ACPI) += tpm_ppi.o eventlog/acpi.o tpm-$(CONFIG_EFI) += eventlog/efi.o tpm-$(CONFIG_OF) += eventlog/of.o diff --git a/drivers/char/tpm/tpm-buf.c b/drivers/char/tpm/tpm-buf.c new file mode 100644 index 000000000000..faa22bb09d99 --- /dev/null +++ b/drivers/char/tpm/tpm-buf.c @@ -0,0 +1,191 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Handing for tpm2b structures to facilitate the building of commands + */ + +#include "tpm.h" + +#include + +#include + +static int __tpm_buf_init(struct tpm_buf *buf) +{ + buf->data_page = alloc_page(GFP_HIGHUSER); + if (!buf->data_page) + return -ENOMEM; + + buf->flags = 0; + buf->data = kmap(buf->data_page); + + return 0; +} + +void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal) +{ + struct tpm_input_header *head; + + head = (struct tpm_input_header *) buf->data; + + head->tag = cpu_to_be16(tag); + head->length = cpu_to_be32(sizeof(*head)); + head->ordinal = cpu_to_be32(ordinal); +} +EXPORT_SYMBOL_GPL(tpm_buf_reset); + +int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal) +{ + int rc; + + rc = __tpm_buf_init(buf); + if (rc) + return rc; + + tpm_buf_reset(buf, tag, ordinal); + + return 0; +} +EXPORT_SYMBOL_GPL(tpm_buf_init); + +int tpm_buf_init_2b(struct tpm_buf *buf) +{ + struct tpm_input_header *head; + int rc; + + rc = __tpm_buf_init(buf); + if (rc) + return rc; + + head = (struct tpm_input_header *) buf->data; + + head->length = cpu_to_be32(sizeof(*head)); + + buf->flags = TPM_BUF_2B; + return 0; +} +EXPORT_SYMBOL_GPL(tpm_buf_init_2b); + +void tpm_buf_destroy(struct tpm_buf *buf) +{ + kunmap(buf->data_page); + __free_page(buf->data_page); +} +EXPORT_SYMBOL_GPL(tpm_buf_destroy); + +static void *tpm_buf_data(struct tpm_buf *buf) +{ + if (buf->flags & TPM_BUF_2B) + return buf->data + TPM_HEADER_SIZE; + return buf->data; +} + +u32 tpm_buf_length(struct tpm_buf *buf) +{ + struct tpm_input_header *head = (struct tpm_input_header *)buf->data; + u32 len; + + len = be32_to_cpu(head->length); + if (buf->flags & TPM_BUF_2B) + len -= sizeof(*head); + return len; +} +EXPORT_SYMBOL_GPL(tpm_buf_length); + +u16 tpm_buf_tag(struct tpm_buf *buf) +{ + struct tpm_input_header *head = (struct tpm_input_header *)buf->data; + + return be16_to_cpu(head->tag); +} +EXPORT_SYMBOL_GPL(tpm_buf_tag); + +void tpm_buf_append(struct tpm_buf *buf, + const unsigned char *new_data, + unsigned int new_len) +{ + struct tpm_input_header *head = (struct tpm_input_header *) buf->data; + u32 len = be32_to_cpu(head->length); + + /* Return silently if overflow has already happened. */ + if (buf->flags & TPM_BUF_OVERFLOW) + return; + + if ((len + new_len) > PAGE_SIZE) { + WARN(1, "tpm_buf: overflow\n"); + buf->flags |= TPM_BUF_OVERFLOW; + return; + } + + memcpy(&buf->data[len], new_data, new_len); + head->length = cpu_to_be32(len + new_len); +} +EXPORT_SYMBOL_GPL(tpm_buf_append); + +void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value) +{ + tpm_buf_append(buf, &value, 1); +} +EXPORT_SYMBOL_GPL(tpm_buf_append_u8); + +void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value) +{ + __be16 value2 = cpu_to_be16(value); + + tpm_buf_append(buf, (u8 *) &value2, 2); +} +EXPORT_SYMBOL_GPL(tpm_buf_append_u16); + +void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value) +{ + __be32 value2 = cpu_to_be32(value); + + tpm_buf_append(buf, (u8 *) &value2, 4); +} +EXPORT_SYMBOL_GPL(tpm_buf_append_u32); + +static void tpm_buf_reset_int(struct tpm_buf *buf) +{ + struct tpm_input_header *head; + + head = (struct tpm_input_header *)buf->data; + head->length = cpu_to_be32(sizeof(*head)); +} + +void tpm_buf_append_2b(struct tpm_buf *buf, struct tpm_buf *tpm2b) +{ + u16 len = tpm_buf_length(tpm2b); + + tpm_buf_append_u16(buf, len); + tpm_buf_append(buf, tpm_buf_data(tpm2b), len); + /* clear the buf for reuse */ + tpm_buf_reset_int(tpm2b); +} +EXPORT_SYMBOL_GPL(tpm_buf_append_2b); + +/* functions for unmarshalling data and moving the cursor */ +u8 tpm_get_inc_u8(const u8 **ptr) +{ + return *((*ptr)++); +} +EXPORT_SYMBOL_GPL(tpm_get_inc_u8); + +u16 tpm_get_inc_u16(const u8 **ptr) +{ + u16 val; + + val = get_unaligned_be16(*ptr); + *ptr += sizeof(val); + return val; +} +EXPORT_SYMBOL_GPL(tpm_get_inc_u16); + +u32 tpm_get_inc_u32(const u8 **ptr) +{ + u32 val; + + val = get_unaligned_be32(*ptr); + *ptr += sizeof(val); + return val; +} +EXPORT_SYMBOL_GPL(tpm_get_inc_u32); diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index f3501d05264f..d73701e36eba 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -416,6 +416,7 @@ struct tpm_cmd_t { enum tpm_buf_flags { TPM_BUF_OVERFLOW = BIT(0), + TPM_BUF_2B = BIT(1), }; struct tpm_buf { @@ -424,86 +425,21 @@ struct tpm_buf { u8 *data; }; -static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal) -{ - struct tpm_input_header *head; - head = (struct tpm_input_header *)buf->data; - head->tag = cpu_to_be16(tag); - head->length = cpu_to_be32(sizeof(*head)); - head->ordinal = cpu_to_be32(ordinal); -} - -static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal) -{ - buf->data_page = alloc_page(GFP_HIGHUSER); - if (!buf->data_page) - return -ENOMEM; - - buf->flags = 0; - buf->data = kmap(buf->data_page); - tpm_buf_reset(buf, tag, ordinal); - return 0; -} - -static inline void tpm_buf_destroy(struct tpm_buf *buf) -{ - kunmap(buf->data_page); - __free_page(buf->data_page); -} - -static inline u32 tpm_buf_length(struct tpm_buf *buf) -{ - struct tpm_input_header *head = (struct tpm_input_header *) buf->data; - - return be32_to_cpu(head->length); -} - -static inline u16 tpm_buf_tag(struct tpm_buf *buf) -{ - struct tpm_input_header *head = (struct tpm_input_header *) buf->data; - - return be16_to_cpu(head->tag); -} - -static inline void tpm_buf_append(struct tpm_buf *buf, - const unsigned char *new_data, - unsigned int new_len) -{ - struct tpm_input_header *head = (struct tpm_input_header *) buf->data; - u32 len = tpm_buf_length(buf); - - /* Return silently if overflow has already happened. */ - if (buf->flags & TPM_BUF_OVERFLOW) - return; - - if ((len + new_len) > PAGE_SIZE) { - WARN(1, "tpm_buf: overflow\n"); - buf->flags |= TPM_BUF_OVERFLOW; - return; - } - - memcpy(&buf->data[len], new_data, new_len); - head->length = cpu_to_be32(len + new_len); -} - -static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value) -{ - tpm_buf_append(buf, &value, 1); -} - -static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value) -{ - __be16 value2 = cpu_to_be16(value); - - tpm_buf_append(buf, (u8 *) &value2, 2); -} - -static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value) -{ - __be32 value2 = cpu_to_be32(value); - - tpm_buf_append(buf, (u8 *) &value2, 4); -} +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_2b(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 unsigned char *new_data, + unsigned int new_len); +void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value); +void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value); +void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value); +void tpm_buf_append_2b(struct tpm_buf *buf, struct tpm_buf *tpm2b); + +u8 tpm_get_inc_u8(const u8 **ptr); +u16 tpm_get_inc_u16(const u8 **ptr); +u32 tpm_get_inc_u32(const u8 **ptr); extern struct class *tpm_class; extern struct class *tpmrm_class; -- 2.16.4