From patchwork Tue Jan 10 22:04:04 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 9508657 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D435F601E9 for ; Tue, 10 Jan 2017 22:04:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B8612285D5 for ; Tue, 10 Jan 2017 22:04:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A9EFF285D4; Tue, 10 Jan 2017 22:04:15 +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 autolearn=ham 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 48749285D4 for ; Tue, 10 Jan 2017 22:04:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752613AbdAJWEN (ORCPT ); Tue, 10 Jan 2017 17:04:13 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:34774 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752259AbdAJWEM (ORCPT ); Tue, 10 Jan 2017 17:04:12 -0500 Received: from pps.filterd (m0098393.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id v0AM3q3L057222 for ; Tue, 10 Jan 2017 17:04:11 -0500 Received: from e37.co.us.ibm.com (e37.co.us.ibm.com [32.97.110.158]) by mx0a-001b2d01.pphosted.com with ESMTP id 27w7grhbef-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 10 Jan 2017 17:04:11 -0500 Received: from localhost by e37.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 10 Jan 2017 15:04:07 -0700 Received: from b01cxnp23034.gho.pok.ibm.com (b01cxnp23034.gho.pok.ibm.com [9.57.198.29]) by d03dlp03.boulder.ibm.com (Postfix) with ESMTP id 2BE7619D803F; Tue, 10 Jan 2017 15:03:24 -0700 (MST) Received: from b01ledav005.gho.pok.ibm.com (b01ledav005.gho.pok.ibm.com [9.57.199.110]) by b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v0AM46il11469136; Tue, 10 Jan 2017 22:04:06 GMT Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B7839AE06B; Tue, 10 Jan 2017 17:04:06 -0500 (EST) Received: from sbct-3.watson.ibm.com (unknown [9.2.141.158]) by b01ledav005.gho.pok.ibm.com (Postfix) with ESMTP id 976B7AE04E; Tue, 10 Jan 2017 17:04:06 -0500 (EST) From: Stefan Berger To: tpmdd-devel@lists.sourceforge.net Cc: linux-security-module@vger.kernel.org, jarkko.sakkinen@linux.intel.com, Stefan Berger Subject: [PATCH v3] tpm: Check size of response before accessing data Date: Tue, 10 Jan 2017 17:04:04 -0500 X-Mailer: git-send-email 2.5.5 X-TM-AS-GCONF: 00 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 17011022-0024-0000-0000-000015AB2B62 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006410; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000199; SDB=6.00805838; UDB=6.00392083; IPR=6.00583174; BA=6.00005042; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00013882; XFM=3.00000011; UTC=2017-01-10 22:04:09 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17011022-0025-0000-0000-000047D63BD5 Message-Id: <1484085844-23374-1-git-send-email-stefanb@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-01-10_16:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=15 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1612050000 definitions=main-1701100290 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Make sure that we have not received less bytes than what is indicated in the header of the TPM response. Also, check the number of bytes in the response before accessing its data. Signed-off-by: Stefan Berger --- drivers/char/tpm/tpm-interface.c | 59 +++++++++++++++++++++---------- drivers/char/tpm/tpm-sysfs.c | 29 +++++++++------ drivers/char/tpm/tpm.h | 7 ++-- drivers/char/tpm/tpm2-cmd.c | 76 +++++++++++++++++++++++++++++----------- drivers/char/tpm/tpm_tis_core.c | 3 +- 5 files changed, 122 insertions(+), 52 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index fecdd3f..403d332 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -434,7 +434,8 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz, * A positive number for a TPM error. */ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd, - int len, unsigned int flags, const char *desc) + size_t len, size_t min_rx_length, + unsigned int flags, const char *desc) { const struct tpm_output_header *header; int err; @@ -446,6 +447,9 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd, return -EFAULT; header = cmd; + if (len < be32_to_cpu(header->length) || + be32_to_cpu(header->length) < min_rx_length) + return -EFAULT; err = be32_to_cpu(header->return_code); if (err != 0 && desc) @@ -468,7 +472,7 @@ static const struct tpm_input_header tpm_getcap_header = { }; ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap, - const char *desc) + const char *desc, size_t min_cap_length) { struct tpm_cmd_t tpm_cmd; int rc; @@ -491,8 +495,9 @@ ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap, tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); tpm_cmd.params.getcap_in.subcap = cpu_to_be32(subcap_id); } - rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0, - desc); + rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, + TPM_HEADER_SIZE + min_cap_length, 0, desc); + if (!rc) *cap = tpm_cmd.params.getcap_out.cap; return rc; @@ -515,7 +520,8 @@ static int tpm_startup(struct tpm_chip *chip, __be16 startup_type) start_cmd.header.in = tpm_startup_header; start_cmd.params.startup_in.startup_type = startup_type; - return tpm_transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE, 0, + return tpm_transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE, + TPM_HEADER_SIZE, 0, "attempting to start the TPM"); } @@ -546,7 +552,8 @@ int tpm_get_timeouts(struct tpm_chip *chip) return 0; } - rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL); + rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL, + sizeof(cap.timeout)); if (rc == TPM_ERR_INVALID_POSTINIT) { /* The TPM is not started, we are the first to talk to it. Execute a startup command. */ @@ -555,7 +562,8 @@ int tpm_get_timeouts(struct tpm_chip *chip) return rc; rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, - "attempting to determine the timeouts"); + "attempting to determine the timeouts", + sizeof(cap.timeout)); } if (rc) { dev_err(&chip->dev, @@ -606,7 +614,8 @@ int tpm_get_timeouts(struct tpm_chip *chip) chip->timeout_d = usecs_to_jiffies(new_timeout[3]); rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap, - "attempting to determine the durations"); + "attempting to determine the durations", + sizeof(cap.duration)); if (rc) return rc; @@ -657,8 +666,9 @@ static int tpm_continue_selftest(struct tpm_chip *chip) struct tpm_cmd_t cmd; cmd.header.in = continue_selftest_header; - rc = tpm_transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE, 0, - "continue selftest"); + rc = tpm_transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE, + CONTINUE_SELFTEST_RESULT_SIZE, + 0, "continue selftest"); return rc; } @@ -677,9 +687,10 @@ int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) cmd.header.in = pcrread_header; cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx); - rc = tpm_transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE, 0, + rc = tpm_transmit_cmd(chip, &cmd, + READ_PCR_RESULT_SIZE, + READ_PCR_RESULT_SIZE, 0, "attempting to read a pcr value"); - if (rc == 0) memcpy(res_buf, cmd.params.pcrread_out.pcr_result, TPM_DIGEST_SIZE); @@ -775,7 +786,8 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) cmd.header.in = pcrextend_header; cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx); memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE); - rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, 0, + rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, + EXTEND_PCR_RESULT_SIZE, 0, "attempting extend a PCR value"); tpm_put_ops(chip); @@ -879,7 +891,8 @@ int tpm_send(u32 chip_num, void *cmd, size_t buflen) if (chip == NULL) return -ENODEV; - rc = tpm_transmit_cmd(chip, cmd, buflen, 0, "attempting tpm_cmd"); + rc = tpm_transmit_cmd(chip, cmd, buflen, TPM_HEADER_SIZE, + 0, "attempting tpm_cmd"); tpm_put_ops(chip); return rc; @@ -981,15 +994,16 @@ int tpm_pm_suspend(struct device *dev) cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr); memcpy(cmd.params.pcrextend_in.hash, dummy_hash, TPM_DIGEST_SIZE); - rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, 0, + rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, + EXTEND_PCR_RESULT_SIZE, 0, "extending dummy pcr before suspend"); } /* now do the actual savestate */ for (try = 0; try < TPM_RETRY; try++) { cmd.header.in = savestate_header; - rc = tpm_transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, 0, - NULL); + rc = tpm_transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, + SAVESTATE_RESULT_SIZE, 0, NULL); /* * If the TPM indicates that it is too busy to respond to @@ -1051,7 +1065,7 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max) { struct tpm_chip *chip; struct tpm_cmd_t tpm_cmd; - u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA); + u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA), rlength; int err, total = 0, retries = 5; u8 *dest = out; @@ -1074,11 +1088,20 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max) err = tpm_transmit_cmd(chip, &tpm_cmd, TPM_GETRANDOM_RESULT_SIZE + num_bytes, + offsetof(struct tpm_cmd_t, + params.getrandom_out.rng_data), 0, "attempting get random"); if (err) break; recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len); + + rlength = be32_to_cpu(tpm_cmd.header.out.length); + if (rlength < offsetof(struct tpm_cmd_t, + params.getrandom_out.rng_data) + recd) { + total = -EFAULT; + break; + } memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd); dest += recd; diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c index 848ad65..bd0134d 100644 --- a/drivers/char/tpm/tpm-sysfs.c +++ b/drivers/char/tpm/tpm-sysfs.c @@ -39,8 +39,9 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr, struct tpm_chip *chip = to_tpm_chip(dev); tpm_cmd.header.in = tpm_readpubek_header; - err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, 0, - "attempting to read the PUBEK"); + err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, + TPM_HEADER_SIZE + 28 + 256, + 0, "attempting to read the PUBEK"); if (err) goto out; @@ -95,7 +96,8 @@ static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr, struct tpm_chip *chip = to_tpm_chip(dev); rc = tpm_getcap(chip, TPM_CAP_PROP_PCR, &cap, - "attempting to determine the number of PCRS"); + "attempting to determine the number of PCRS", + sizeof(cap.num_pcrs)); if (rc) return 0; @@ -120,7 +122,8 @@ static ssize_t enabled_show(struct device *dev, struct device_attribute *attr, ssize_t rc; rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap, - "attempting to determine the permanent enabled state"); + "attempting to determine the permanent enabled state", + sizeof(cap.perm_flags)); if (rc) return 0; @@ -136,7 +139,8 @@ static ssize_t active_show(struct device *dev, struct device_attribute *attr, ssize_t rc; rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap, - "attempting to determine the permanent active state"); + "attempting to determine the permanent active state", + sizeof(cap.perm_flags)); if (rc) return 0; @@ -152,7 +156,8 @@ static ssize_t owned_show(struct device *dev, struct device_attribute *attr, ssize_t rc; rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap, - "attempting to determine the owner state"); + "attempting to determine the owner state", + sizeof(cap.owned)); if (rc) return 0; @@ -168,7 +173,8 @@ static ssize_t temp_deactivated_show(struct device *dev, ssize_t rc; rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap, - "attempting to determine the temporary state"); + "attempting to determine the temporary state", + sizeof(cap.stclear_flags)); if (rc) return 0; @@ -186,7 +192,8 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr, char *str = buf; rc = tpm_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap, - "attempting to determine the manufacturer"); + "attempting to determine the manufacturer", + sizeof(cap.manufacturer_id)); if (rc) return 0; str += sprintf(str, "Manufacturer: 0x%x\n", @@ -194,7 +201,8 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr, /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */ rc = tpm_getcap(chip, TPM_CAP_VERSION_1_2, &cap, - "attempting to determine the 1.2 version"); + "attempting to determine the 1.2 version", + sizeof(cap.tpm_version_1_2)); if (!rc) { str += sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n", @@ -205,7 +213,8 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr, } else { /* Otherwise just use TPM_STRUCT_VER */ rc = tpm_getcap(chip, TPM_CAP_VERSION_1_1, &cap, - "attempting to determine the 1.1 version"); + "attempting to determine the 1.1 version", + sizeof(cap.tpm_version)); if (rc) return 0; str += sprintf(str, diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 1ae9768..9e81865 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -493,10 +493,11 @@ enum tpm_transmit_flags { ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz, unsigned int flags); -ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd, int len, - unsigned int flags, const char *desc); +ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd, size_t len, + size_t min_tx_length, unsigned int flags, + const char *desc); ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap, - const char *desc); + const char *desc, size_t min_cap_length); int tpm_get_timeouts(struct tpm_chip *); int tpm1_auto_startup(struct tpm_chip *chip); int tpm_do_selftest(struct tpm_chip *chip); diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index 6eda239..201538e 100644 --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -248,6 +248,10 @@ static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = { (sizeof(struct tpm_input_header) + \ sizeof(struct tpm2_pcr_read_in)) +#define TPM2_PCR_READ_OUT_SIZE \ + (sizeof(struct tpm_output_header) + \ + sizeof(struct tpm2_pcr_read_out)) + static const struct tpm_input_header tpm2_pcrread_header = { .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), .length = cpu_to_be32(TPM2_PCR_READ_IN_SIZE), @@ -280,8 +284,8 @@ int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) sizeof(cmd.params.pcrread_in.pcr_select)); cmd.params.pcrread_in.pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7); - rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, - "attempting to read a pcr value"); + rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), TPM2_PCR_READ_OUT_SIZE, + 0, "attempting to read a pcr value"); if (rc == 0) { buf = cmd.params.pcrread_out.digest; memcpy(res_buf, buf, TPM_DIGEST_SIZE); @@ -327,7 +331,7 @@ int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash) cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1); memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE); - rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, + rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), TPM_HEADER_SIZE, 0, "attempting extend a PCR value"); return rc; @@ -356,7 +360,7 @@ static const struct tpm_input_header tpm2_getrandom_header = { int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max) { struct tpm2_cmd cmd; - u32 recd; + u32 recd, rlength; u32 num_bytes; int err; int total = 0; @@ -373,13 +377,19 @@ int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max) cmd.header.in = tpm2_getrandom_header; cmd.params.getrandom_in.size = cpu_to_be16(num_bytes); - err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, - "attempting get random"); + err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), + offsetof(struct tpm2_cmd, + params.getrandom_out.buffer), + 0, "attempting get random"); if (err) break; recd = min_t(u32, be16_to_cpu(cmd.params.getrandom_out.size), num_bytes); + rlength = be32_to_cpu(cmd.header.out.length); + if (rlength < offsetof(struct tpm2_cmd, + params.getrandom_out.buffer) + recd) + return -EFAULT; memcpy(dest, cmd.params.getrandom_out.buffer, recd); dest += recd; @@ -394,6 +404,10 @@ int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max) (sizeof(struct tpm_input_header) + \ sizeof(struct tpm2_get_tpm_pt_in)) +#define TPM2_GET_TPM_PT_OUT_SIZE \ + (sizeof(struct tpm_output_header) + \ + sizeof(struct tpm2_get_tpm_pt_out)) + static const struct tpm_input_header tpm2_get_tpm_pt_header = { .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), .length = cpu_to_be32(TPM2_GET_TPM_PT_IN_SIZE), @@ -445,7 +459,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip, { unsigned int blob_len; struct tpm_buf buf; - u32 hash; + u32 hash, rlength; int i; int rc; @@ -510,7 +524,9 @@ int tpm2_seal_trusted(struct tpm_chip *chip, goto out; } - rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 0, "sealing data"); + rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, + TPM_HEADER_SIZE + 4, + 0, "sealing data"); if (rc) goto out; @@ -519,6 +535,11 @@ int tpm2_seal_trusted(struct tpm_chip *chip, rc = -E2BIG; goto out; } + rlength = be32_to_cpu(((struct tpm2_cmd*)&buf)->header.out.length); + if (rlength < TPM_HEADER_SIZE + 4 + blob_len) { + rc = -EFAULT; + goto out; + } memcpy(payload->blob, &buf.data[TPM_HEADER_SIZE + 4], blob_len); payload->blob_len = blob_len; @@ -588,7 +609,8 @@ static int tpm2_load_cmd(struct tpm_chip *chip, goto out; } - rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, flags, "loading blob"); + rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, + TPM_HEADER_SIZE + 4, flags, "loading blob"); if (!rc) *blob_handle = be32_to_cpup( (__be32 *) &buf.data[TPM_HEADER_SIZE]); @@ -626,8 +648,8 @@ static void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle, tpm_buf_append_u32(&buf, handle); - rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, flags, - "flushing context"); + rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, TPM_HEADER_SIZE, + flags, "flushing context"); if (rc) dev_warn(&chip->dev, "0x%08x was not flushed, rc=%d\n", handle, rc); @@ -657,6 +679,7 @@ static int tpm2_unseal_cmd(struct tpm_chip *chip, u16 data_len; u8 *data; int rc; + u32 rlength; rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_UNSEAL); if (rc) @@ -671,13 +694,21 @@ static int tpm2_unseal_cmd(struct tpm_chip *chip, options->blobauth /* hmac */, TPM_DIGEST_SIZE); - rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, flags, "unsealing"); + rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, + TPM_HEADER_SIZE + 4 + 2, flags, "unsealing"); if (rc > 0) rc = -EPERM; if (!rc) { data_len = be16_to_cpup( (__be16 *) &buf.data[TPM_HEADER_SIZE + 4]); + + rlength = be32_to_cpu(((struct tpm2_cmd *)&buf) + ->header.out.length); + if (rlength < TPM_HEADER_SIZE + 4 + 2 + data_len) { + rc = -EFAULT; + goto out; + } data = &buf.data[TPM_HEADER_SIZE + 6]; memcpy(payload->key, data, data_len - 1); @@ -685,6 +716,7 @@ static int tpm2_unseal_cmd(struct tpm_chip *chip, payload->migratable = data[data_len - 1]; } +out: tpm_buf_destroy(&buf); return rc; } @@ -739,7 +771,8 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value, cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(property_id); cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1); - rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, desc); + rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), + TPM2_GET_TPM_PT_OUT_SIZE, 0, desc); if (!rc) *value = be32_to_cpu(cmd.params.get_tpm_pt_out.value); @@ -773,8 +806,8 @@ static int tpm2_startup(struct tpm_chip *chip, u16 startup_type) cmd.header.in = tpm2_startup_header; cmd.params.startup_in.startup_type = cpu_to_be16(startup_type); - return tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, - "attempting to start the TPM"); + return tpm_transmit_cmd(chip, &cmd, sizeof(cmd), TPM_HEADER_SIZE, + 0, "attempting to start the TPM"); } #define TPM2_SHUTDOWN_IN_SIZE \ @@ -802,7 +835,8 @@ void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type) cmd.header.in = tpm2_shutdown_header; cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type); - rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, "stopping the TPM"); + rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), TPM_HEADER_SIZE, + 0, "stopping the TPM"); /* In places where shutdown command is sent there's no much we can do * except print the error code on a system failure. @@ -865,8 +899,8 @@ static int tpm2_start_selftest(struct tpm_chip *chip, bool full) cmd.header.in = tpm2_selftest_header; cmd.params.selftest_in.full_test = full; - rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE, 0, - "continue selftest"); + rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE, + TPM_HEADER_SIZE, 0, "continue selftest"); /* At least some prototype chips seem to give RC_TESTING error * immediately. This is a workaround for that. @@ -916,7 +950,8 @@ static int tpm2_do_selftest(struct tpm_chip *chip) cmd.params.pcrread_in.pcr_select[1] = 0x00; cmd.params.pcrread_in.pcr_select[2] = 0x00; - rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, NULL); + rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), TPM_HEADER_SIZE, + 0, NULL); if (rc < 0) break; @@ -949,7 +984,8 @@ int tpm2_probe(struct tpm_chip *chip) cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100); cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1); - rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0, NULL); + rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), TPM_HEADER_SIZE, + 0, NULL); if (rc < 0) return rc; diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index 7993678..93a12be 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -552,7 +552,8 @@ static int tpm_tis_gen_interrupt(struct tpm_chip *chip) if (chip->flags & TPM_CHIP_FLAG_TPM2) return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc); else - return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc); + return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, + sizeof(cap.timeout)); } /* Register the IRQ and issue a command that will cause an interrupt. If an