From patchwork Mon Jun 17 00:50:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gaurav Kashyap (QUIC)" X-Patchwork-Id: 13699749 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (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 5B79913A897; Mon, 17 Jun 2024 00:59:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718585986; cv=none; b=k34VANS+S6HcMcyOFStISNRd/A+GiZvMf35BRoUxwVlORYGGOA7/vMKWJ7pVdSUVTtQmQ01TNRxREqrBPMaZtOSIX7chKmkiWl7uqXEfNtez6plDqJ6mbxVlvMgK++sbgUurLxQTiG0lQb6X62xMSdtfZ59wgaIZsyxH2pWOUrI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718585986; c=relaxed/simple; bh=tLe18O4p3ZzviNMYPnK0ebczZImFCYVMo5CSNIuwba8=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ltgjWxIOB+hrVFgwyiDKbDR4pUp9bCIA4SZnD2D3CZZlzS2v2l5h3fSaITy0ZIDvDL7/wA95XsKs3NFbPBxfiY+PxLi0As/c0vyKz7x3RieSNIRQodRS5j15hR3k0InWP1OoqQ6HCksAoDP0kWHhneE89KKtCH6UDCrLgSSfgxw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=c4+WsiLq; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="c4+WsiLq" Received: from pps.filterd (m0279868.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 45H0SVUP003442; Mon, 17 Jun 2024 00:59:00 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= BQ94rsMIum+RsaYZOXw5/zGt3WWsXoGXTsqeDfjPN+E=; b=c4+WsiLq0d+LqpfZ 7Am4rTXzW4CMtS5bgT4h7eGmM9qjDjxty+vgB3zw4MQz+jQ0aqK/EAeLpBOCZqnB bXT4v7GZ7/J4/BQv+sCovKI7lHwRLrv+jt33t7LkWRy9wwyWSUtdLr38Kz+aGs1E KlTKm/vR2qPvCzSeCGD96jQqxQjGouJLeNgcpNJ/n1Y98OLlzNW74SevsBsC7uzn DCm0tmk4rzV2XaFsKXN/L/E2ows7iId+KNKj8BjAunrPXGIktWe7dPH9X1ETN70y NI0Fdm5jkIzizInHZFyRop7rF/irUyOaRnApZKUkQPxv/fMlhmWUthnUDi+s2Q9v Fo6sMw== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3ys29gtf05-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 17 Jun 2024 00:59:00 +0000 (GMT) Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA01.qualcomm.com (8.17.1.19/8.17.1.19) with ESMTPS id 45H0wxKT009628 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 17 Jun 2024 00:58:59 GMT Received: from hu-gaurkash-lv.qualcomm.com (10.49.16.6) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Sun, 16 Jun 2024 17:58:53 -0700 From: Gaurav Kashyap To: , , , , , , , , CC: , , , , , , , , , , , , , , , , , , Gaurav Kashyap Subject: [PATCH v5 03/15] qcom_scm: scm call for create, prepare and import keys Date: Sun, 16 Jun 2024 17:50:58 -0700 Message-ID: <20240617005825.1443206-4-quic_gaurkash@quicinc.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240617005825.1443206-1-quic_gaurkash@quicinc.com> References: <20240617005825.1443206-1-quic_gaurkash@quicinc.com> Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: a2Z1krcVaISQ1MLZUvx9LbljUJtRiQMy X-Proofpoint-ORIG-GUID: a2Z1krcVaISQ1MLZUvx9LbljUJtRiQMy X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-16_12,2024-06-14_03,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 adultscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 priorityscore=1501 malwarescore=0 bulkscore=0 phishscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406170006 Storage encryption has two IOCTLs for creating, importing and preparing keys for encryption. For wrapped keys, these IOCTLs need to interface with Qualcomm's Trustzone, which require these SCM calls. generate_key: This is used to generate and return a longterm wrapped key. Trustzone achieves this by generating a key and then wrapping it using hwkm, returning a wrapped keyblob. import_key: The functionality is similar to generate, but here, a raw key is imported into hwkm and a longterm wrapped keyblob is returned. prepare_key: The longterm wrapped key from import or generate is made further secure by rewrapping it with a per-boot ephemeral wrapped key before installing it to the linux kernel for programming to ICE. Tested-by: Neil Armstrong Signed-off-by: Gaurav Kashyap --- drivers/firmware/qcom/qcom_scm.c | 175 +++++++++++++++++++++++++ drivers/firmware/qcom/qcom_scm.h | 3 + include/linux/firmware/qcom/qcom_scm.h | 5 + 3 files changed, 183 insertions(+) diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c index 8f23b459c525..61a1ace3c683 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -1309,6 +1309,181 @@ int qcom_scm_derive_sw_secret(const u8 *wkey, size_t wkey_size, } EXPORT_SYMBOL_GPL(qcom_scm_derive_sw_secret); +/** + * qcom_scm_generate_ice_key() - Generate a wrapped key for encryption. + * @lt_key: the wrapped key returned after key generation + * @lt_key_size: size of the wrapped key to be returned. + * + * Qualcomm wrapped keys need to be generated in a trusted environment. + * A generate key IOCTL call is used to achieve this. These are longterm + * in nature as they need to be generated and wrapped only once per + * requirement. + * + * Adds support for the create key IOCTL to interface + * with the secure environment to generate and return a wrapped key.. + * + * Return: 0 on success; -errno on failure. + */ +int qcom_scm_generate_ice_key(u8 *lt_key, size_t lt_key_size) +{ + struct qcom_scm_desc desc = { + .svc = QCOM_SCM_SVC_ES, + .cmd = QCOM_SCM_ES_GENERATE_ICE_KEY, + .arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_RW, QCOM_SCM_VAL), + .args[1] = lt_key_size, + .owner = ARM_SMCCC_OWNER_SIP, + }; + + int ret; + + void *lt_key_buf __free(qcom_tzmem) = qcom_tzmem_alloc(__scm->mempool, + lt_key_size, + GFP_KERNEL); + if (!lt_key_buf) + return -ENOMEM; + + desc.args[0] = qcom_tzmem_to_phys(lt_key_buf); + + ret = qcom_scm_call(__scm->dev, &desc, NULL); + if (!ret) + memcpy(lt_key, lt_key_buf, lt_key_size); + + memzero_explicit(lt_key_buf, lt_key_size); + + return ret; +} +EXPORT_SYMBOL_GPL(qcom_scm_generate_ice_key); + +/** + * qcom_scm_prepare_ice_key() - Get per boot ephemeral wrapped key + * @lt_key: the longterm wrapped key + * @lt_key_size: size of the wrapped key + * @eph_key: ephemeral wrapped key to be returned + * @eph_key_size: size of the ephemeral wrapped key + * + * Qualcomm wrapped keys (longterm keys) are rewrapped with a per-boot + * ephemeral key for added protection. These are ephemeral in nature as + * they are valid only for that boot. A create key IOCTL is used to + * achieve this. These are the keys that are installed into the kernel + * to be then unwrapped and programmed into ICE. + * + * Adds support for the create key IOCTL to interface + * with the secure environment to rewrap the wrapped key with an + * ephemeral wrapping key. + * + * Return: 0 on success; -errno on failure. + */ +int qcom_scm_prepare_ice_key(const u8 *lt_key, size_t lt_key_size, + u8 *eph_key, size_t eph_key_size) +{ + struct qcom_scm_desc desc = { + .svc = QCOM_SCM_SVC_ES, + .cmd = QCOM_SCM_ES_PREPARE_ICE_KEY, + .arginfo = QCOM_SCM_ARGS(4, QCOM_SCM_RO, + QCOM_SCM_VAL, QCOM_SCM_RW, + QCOM_SCM_VAL), + .args[1] = lt_key_size, + .args[3] = eph_key_size, + .owner = ARM_SMCCC_OWNER_SIP, + }; + + int ret; + + void *lt_key_buf __free(qcom_tzmem) = qcom_tzmem_alloc(__scm->mempool, + lt_key_size, + GFP_KERNEL); + if (!lt_key_buf) + return -ENOMEM; + + void *eph_key_buf __free(qcom_tzmem) = qcom_tzmem_alloc(__scm->mempool, + eph_key_size, + GFP_KERNEL); + if (!eph_key_buf) { + ret = -ENOMEM; + goto out_free_longterm; + } + + memcpy(lt_key_buf, lt_key, lt_key_size); + desc.args[0] = qcom_tzmem_to_phys(lt_key_buf); + desc.args[2] = qcom_tzmem_to_phys(eph_key_buf); + + ret = qcom_scm_call(__scm->dev, &desc, NULL); + if (!ret) + memcpy(eph_key, eph_key_buf, eph_key_size); + + memzero_explicit(eph_key_buf, eph_key_size); + +out_free_longterm: + memzero_explicit(lt_key_buf, lt_key_size); + + return ret; +} +EXPORT_SYMBOL_GPL(qcom_scm_prepare_ice_key); + +/** + * qcom_scm_import_ice_key() - Import a wrapped key for encryption + * @imp_key: the raw key that is imported + * @imp_key_size: size of the key to be imported + * @lt_key: the wrapped key to be returned + * @lt_key_size: size of the wrapped key + * + * Conceptually, this is very similar to generate, the difference being, + * here we want to import a raw key and return a longterm wrapped key + * from it. The same create key IOCTL is used to achieve this. + * + * Adds support for the create key IOCTL to interface with + * the secure environment to import a raw key and generate a longterm + * wrapped key. + * + * Return: 0 on success; -errno on failure. + */ +int qcom_scm_import_ice_key(const u8 *imp_key, size_t imp_key_size, + u8 *lt_key, size_t lt_key_size) +{ + struct qcom_scm_desc desc = { + .svc = QCOM_SCM_SVC_ES, + .cmd = QCOM_SCM_ES_IMPORT_ICE_KEY, + .arginfo = QCOM_SCM_ARGS(4, QCOM_SCM_RO, + QCOM_SCM_VAL, QCOM_SCM_RW, + QCOM_SCM_VAL), + .args[1] = imp_key_size, + .args[3] = lt_key_size, + .owner = ARM_SMCCC_OWNER_SIP, + }; + + int ret; + + void *imp_key_buf __free(qcom_tzmem) = qcom_tzmem_alloc(__scm->mempool, + imp_key_size, + GFP_KERNEL); + if (!imp_key_buf) + return -ENOMEM; + + void *lt_key_buf __free(qcom_tzmem) = qcom_tzmem_alloc(__scm->mempool, + lt_key_size, + GFP_KERNEL); + if (!lt_key_buf) { + ret = -ENOMEM; + goto out_free_longterm; + } + + memcpy(imp_key_buf, imp_key, imp_key_size); + desc.args[0] = qcom_tzmem_to_phys(imp_key_buf); + desc.args[2] = qcom_tzmem_to_phys(lt_key_buf); + + ret = qcom_scm_call(__scm->dev, &desc, NULL); + if (!ret) + memcpy(lt_key, lt_key_buf, lt_key_size); + + memzero_explicit(lt_key_buf, lt_key_size); + +out_free_longterm: + memzero_explicit(imp_key_buf, imp_key_size); + + return ret; +} +EXPORT_SYMBOL_GPL(qcom_scm_import_ice_key); + /** * qcom_scm_hdcp_available() - Check if secure environment supports HDCP. * diff --git a/drivers/firmware/qcom/qcom_scm.h b/drivers/firmware/qcom/qcom_scm.h index 56ff0806f5d2..c30d6383b6de 100644 --- a/drivers/firmware/qcom/qcom_scm.h +++ b/drivers/firmware/qcom/qcom_scm.h @@ -128,6 +128,9 @@ struct qcom_tzmem_pool *qcom_scm_get_tzmem_pool(void); #define QCOM_SCM_ES_INVALIDATE_ICE_KEY 0x03 #define QCOM_SCM_ES_CONFIG_SET_ICE_KEY 0x04 #define QCOM_SCM_ES_DERIVE_SW_SECRET 0x07 +#define QCOM_SCM_ES_GENERATE_ICE_KEY 0x08 +#define QCOM_SCM_ES_PREPARE_ICE_KEY 0x09 +#define QCOM_SCM_ES_IMPORT_ICE_KEY 0xA #define QCOM_SCM_SVC_HDCP 0x11 #define QCOM_SCM_HDCP_INVOKE 0x01 diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h index ce343e102c84..665ea8f0e8bb 100644 --- a/include/linux/firmware/qcom/qcom_scm.h +++ b/include/linux/firmware/qcom/qcom_scm.h @@ -105,6 +105,11 @@ int qcom_scm_ice_set_key(u32 index, const u8 *key, u32 key_size, enum qcom_scm_ice_cipher cipher, u32 data_unit_size); int qcom_scm_derive_sw_secret(const u8 *wkey, size_t wkey_size, u8 *sw_secret, size_t sw_secret_size); +int qcom_scm_generate_ice_key(u8 *lt_key, size_t lt_key_size); +int qcom_scm_prepare_ice_key(const u8 *lt_key, size_t lt_key_size, + u8 *eph_key, size_t eph_size); +int qcom_scm_import_ice_key(const u8 *imp_key, size_t imp_size, + u8 *lt_key, size_t lt_key_size); bool qcom_scm_hdcp_available(void); int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp);