From patchwork Sat Nov 3 01:21:21 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 10666427 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DDE1D13BF for ; Sat, 3 Nov 2018 01:21:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D0C5C2B532 for ; Sat, 3 Nov 2018 01:21:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C54182B589; Sat, 3 Nov 2018 01:21:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI, SUBJ_OBFU_PUNCT_MANY autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CCECD2B587 for ; Sat, 3 Nov 2018 01:21:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728164AbeKCKbD (ORCPT ); Sat, 3 Nov 2018 06:31:03 -0400 Received: from mga18.intel.com ([134.134.136.126]:26626 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725865AbeKCKbD (ORCPT ); Sat, 3 Nov 2018 06:31:03 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Nov 2018 18:21:33 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,458,1534834800"; d="scan'208";a="246621936" Received: from djustese-mobl1.ger.corp.intel.com (HELO localhost) ([10.249.254.59]) by orsmga004.jf.intel.com with ESMTP; 02 Nov 2018 18:21:28 -0700 From: Jarkko Sakkinen To: linux-integrity@vger.kernel.org Cc: linux-security-module@vger.kernel.org, James Bottomley , Jarkko Sakkinen , Peter Huewe , Jason Gunthorpe , Arnd Bergmann , Greg Kroah-Hartman , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] tpm: move tpm_validate_commmand() to tpm2-space.c Date: Sat, 3 Nov 2018 03:21:21 +0200 Message-Id: <20181103012122.25434-1-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Move tpm_validate_command() to tpm2-space.c and make it part of the tpm2_prepare_space() flow. Make cc resolution as part of the TPM space functionality in order to detach it from rest of the tpm_transmit() flow. Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-interface.c | 72 +++++++------------------------- drivers/char/tpm/tpm.h | 9 ++-- drivers/char/tpm/tpm2-space.c | 54 +++++++++++++++++++++--- 3 files changed, 68 insertions(+), 67 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index dd97a17243e3..dcdf2436ae44 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -62,47 +62,6 @@ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal) } EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration); -static int tpm_validate_command(struct tpm_chip *chip, - struct tpm_space *space, - const u8 *cmd, - size_t len) -{ - const struct tpm_input_header *header = (const void *)cmd; - int i; - u32 cc; - u32 attrs; - unsigned int nr_handles; - - if (len < TPM_HEADER_SIZE) - return -EINVAL; - - if (!space) - return 0; - - if (chip->flags & TPM_CHIP_FLAG_TPM2 && chip->nr_commands) { - cc = be32_to_cpu(header->ordinal); - - i = tpm2_find_cc(chip, cc); - if (i < 0) { - dev_dbg(&chip->dev, "0x%04X is an invalid command\n", - cc); - return -EOPNOTSUPP; - } - - attrs = chip->cc_attrs_tbl[i]; - nr_handles = - 4 * ((attrs >> TPM2_CC_ATTR_CHANDLES) & GENMASK(2, 0)); - if (len < TPM_HEADER_SIZE + 4 * nr_handles) - goto err_len; - } - - return 0; -err_len: - dev_dbg(&chip->dev, - "%s: insufficient command length %zu", __func__, len); - return -EINVAL; -} - static int tpm_request_locality(struct tpm_chip *chip, unsigned int flags) { int rc; @@ -172,20 +131,8 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, u32 count, ordinal; unsigned long stop; - rc = tpm_validate_command(chip, space, buf, bufsiz); - if (rc == -EINVAL) - return rc; - /* - * If the command is not implemented by the TPM, synthesize a - * response with a TPM2_RC_COMMAND_CODE return for user-space. - */ - if (rc == -EOPNOTSUPP) { - header->length = cpu_to_be32(sizeof(*header)); - header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS); - header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE | - TSS2_RESMGR_TPM_RC_LAYER); - return sizeof(*header); - } + if (bufsiz < TPM_HEADER_SIZE) + return -EINVAL; if (bufsiz > TPM_BUFSIZE) bufsiz = TPM_BUFSIZE; @@ -200,7 +147,18 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, return -E2BIG; } - rc = tpm2_prepare_space(chip, space, ordinal, buf); + rc = tpm2_prepare_space(chip, space, buf, bufsiz); + /* + * If the command is not implemented by the TPM, synthesize a + * response with a TPM2_RC_COMMAND_CODE return for user-space. + */ + if (rc == -EOPNOTSUPP) { + header->length = cpu_to_be32(sizeof(*header)); + header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS); + header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE | + TSS2_RESMGR_TPM_RC_LAYER); + return sizeof(*header); + } if (rc) return rc; @@ -244,7 +202,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length)) return -EFAULT; - rc = tpm2_commit_space(chip, space, ordinal, buf, &len); + rc = tpm2_commit_space(chip, space, buf, &len); if (rc) { dev_err(&chip->dev, "%s: commit error %d\n", __func__, rc); return rc; diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 49bca4d1e786..d4a5d5ca64b0 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -264,6 +264,7 @@ struct tpm_chip { #endif /* CONFIG_ACPI */ struct tpm_space work_space; + u32 last_cc; u32 nr_commands; u32 *cc_attrs_tbl; @@ -579,10 +580,10 @@ int tpm2_probe(struct tpm_chip *chip); int tpm2_find_cc(struct tpm_chip *chip, u32 cc); int tpm2_init_space(struct tpm_space *space); void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space); -int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u32 cc, - u8 *cmd); -int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, - u32 cc, u8 *buf, size_t *bufsiz); +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, u8 *buf, + size_t *bufsiz); int tpm_bios_log_setup(struct tpm_chip *chip); void tpm_bios_log_teardown(struct tpm_chip *chip); diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c index 1131a8e7b79b..eb8f85b6f485 100644 --- a/drivers/char/tpm/tpm2-space.c +++ b/drivers/char/tpm/tpm2-space.c @@ -264,14 +264,55 @@ static int tpm2_map_command(struct tpm_chip *chip, u32 cc, u8 *cmd) return 0; } -int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u32 cc, - u8 *cmd) +static int tpm_validate_command(struct tpm_chip *chip, struct tpm_space *space, + const u8 *cmd, size_t len) +{ + const struct tpm_input_header *header = (const void *)cmd; + int i; + u32 cc; + u32 attrs; + unsigned int nr_handles; + + if (len < TPM_HEADER_SIZE) + return -EINVAL; + + if (chip->nr_commands) { + cc = be32_to_cpu(header->ordinal); + + i = tpm2_find_cc(chip, cc); + if (i < 0) { + dev_dbg(&chip->dev, "0x%04X is an invalid command\n", + cc); + return -EOPNOTSUPP; + } + + attrs = chip->cc_attrs_tbl[i]; + nr_handles = + 4 * ((attrs >> TPM2_CC_ATTR_CHANDLES) & GENMASK(2, 0)); + if (len < TPM_HEADER_SIZE + 4 * nr_handles) + goto err_len; + } + + return cc; +err_len: + dev_dbg(&chip->dev, "%s: insufficient command length %zu", __func__, + len); + return -EINVAL; +} + +int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u8 *cmd, + size_t cmdsiz) { int rc; + int cc; if (!space) return 0; + cc = tpm_validate_command(chip, space, cmd, cmdsiz); + if (cc < 0) + return cc; + memcpy(&chip->work_space.context_tbl, &space->context_tbl, sizeof(space->context_tbl)); memcpy(&chip->work_space.session_tbl, &space->session_tbl, @@ -291,6 +332,7 @@ int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u32 cc, return rc; } + chip->last_cc = cc; return 0; } @@ -489,8 +531,8 @@ static int tpm2_save_space(struct tpm_chip *chip) return 0; } -int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, - u32 cc, u8 *buf, size_t *bufsiz) +int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, u8 *buf, + size_t *bufsiz) { struct tpm_output_header *header = (void *)buf; int rc; @@ -498,13 +540,13 @@ int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, if (!space) return 0; - rc = tpm2_map_response_header(chip, cc, buf, *bufsiz); + rc = tpm2_map_response_header(chip, chip->last_cc, buf, *bufsiz); if (rc) { tpm2_flush_space(chip); return rc; } - rc = tpm2_map_response_body(chip, cc, buf, *bufsiz); + rc = tpm2_map_response_body(chip, chip->last_cc, buf, *bufsiz); if (rc) { tpm2_flush_space(chip); return rc;