From patchwork Mon Dec 2 12:02:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 13890453 Received: from mail-wm1-f43.google.com (mail-wm1-f43.google.com [209.85.128.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E75C420408A for ; Mon, 2 Dec 2024 12:02:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.43 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733140974; cv=none; b=twOM6MgLvWGX1oOFcU2hATrkIsN5AnIQlVQoac61AFxBLUYWeUarNkkW5vvM1gziDZ0iV2k4sjZQBLNbWT3INcMaw1LW8aLCfHxjjEte71zq20CLiHIp8GUJ167Hdyt84cM8WaHNqCfQ1n7nBWJk65bqqHokWfCHs1AH1wtZRTg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733140974; c=relaxed/simple; bh=2ORU5vyUJ27lap9sqAiI3qTrLNQQhoC73WWhD6bjviY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=CAcC5pEi+ltHS2WXjXNpzVzLaGaWk3CHflNknL81N5POmofdOb8wGRDi83LksIVb2WX7bPw06CraXBv7pjrRJRFZdgWFAt/48fhC6w5wxIw/2dqUwzKxPxWJ9MIXRGKv4BL7rF3Jd5uAdSo95nZEbucMgzv09P0Q2ohWmuMY/SQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=bgdev.pl; spf=none smtp.mailfrom=bgdev.pl; dkim=pass (2048-bit key) header.d=bgdev-pl.20230601.gappssmtp.com header.i=@bgdev-pl.20230601.gappssmtp.com header.b=SREQ59kL; arc=none smtp.client-ip=209.85.128.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=bgdev.pl Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bgdev.pl Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bgdev-pl.20230601.gappssmtp.com header.i=@bgdev-pl.20230601.gappssmtp.com header.b="SREQ59kL" Received: by mail-wm1-f43.google.com with SMTP id 5b1f17b1804b1-434a736518eso52520965e9.1 for ; Mon, 02 Dec 2024 04:02:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20230601.gappssmtp.com; s=20230601; t=1733140967; x=1733745767; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=v5lbIjJ4pCG8r8J9xIS9Rd3wgRBn4855nSdT5ZJ6kC4=; b=SREQ59kL3ga7GzxjqD5aXpP9UTOp8b0Lp+i2xtybWbfF/R5Y0gFY4MJF2bxceSW1qq twqGL+DX6wBj16+avqPZCo1rYh1dr11k/ffnTsCNyyRIMrlam38HUA851ubfoTet32us AKeNHLnLcqBLVPx2mjM/4r2AZRY4pq7lSqDUvU9KZPvMqrEAE74nC/ThfC38A/gAxznO SdihYitd2kkCpcnm+nT1Uc4Glu74NpU5wshq2TNpne2hwN/5xpgt/YZ0rMZdQSUuq2S5 AaEBZDmXMB5DmhlkmZfYjdk6hTfr5Xt5Kuqs3bZxIVHASyPlF5zTtu2w9TPq2cxua+Lf buWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733140967; x=1733745767; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=v5lbIjJ4pCG8r8J9xIS9Rd3wgRBn4855nSdT5ZJ6kC4=; b=CZRPfTg769vLHMpzF22b6/j/xPtx7tcyDzHTL3999Gvn9nCPOwCEjtOCKm5wR7B6Bu qX4J58kwvqO2bR6iiGDVljfDHw2wrz2IXQd3PHbNbsA0fmrZtcORw+KwxZ9Fy/ovEle5 DEbMMkqq9a2gUMFe007IbpNkcsyoB8R2oopXcKYffTrh5Tqz90CTsrrvPIWyyZ7LhoKP g2f1a7kYh1qy8u+IRF0NmRzaM90W06/7+PIjT3zxnyt4s0AvTb6qmbiqzir2StUXfPBR b9CDkjVCyRz/OR/bcDEQCIhznpPUwb6G0Ux2OBVkg5pD/KqzmyFfBZanctEw25ruGwKd v/vQ== X-Forwarded-Encrypted: i=1; AJvYcCXebnTI06tIrtrAFjYhlRHWCgjqUP3qRTgxJeGx3xtfo4MXohR+B1bfy5wtP5kt0Q/x+Hka11ISqJRRfl9U@vger.kernel.org X-Gm-Message-State: AOJu0YzTzjTxH9NTWqRAfW5ULAZ2R2Vt7HU0UKcCVjnBjGkSDeWzpeKt gwYRPwdxx5hieh8cSEQqXs9cAvJtjlFWOu73YdJW6HlghhHay0lj+oQJSfgemno= X-Gm-Gg: ASbGnctAeytEVmbzO9ue6GgsB/nkird2tDSCZK3lwm4JZPeqAxSMABSjdzgj6QAno8y l5feCLjxiOT9vYTz7Mu4f/zJepWn62LTakIIHUsq7sZt9smMJasQRjvqpRLHySEGwTPQTU6TAD6 7V2rOarisYY8mpx8CSMvL6r3rl4ERUj3w239stoMZj53kbUCuy54KGAS8VrV9STOTbLTlVKLwsV PoWZK5xvURrcBxD5DTsGQtr8yffw/pcQ0RZ9ami X-Google-Smtp-Source: AGHT+IHQAyekXbdAXZ7eydZRNVx2vlbKBM8IKXEW49sElJ/U7e3rXwUNnq8MwjxBEeFibtagQDeTrA== X-Received: by 2002:a05:600c:3585:b0:434:a04d:1670 with SMTP id 5b1f17b1804b1-434a9d4f86dmr259111775e9.0.1733140966888; Mon, 02 Dec 2024 04:02:46 -0800 (PST) Received: from [127.0.1.1] ([193.57.185.11]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-434b0d9bed7sm152396095e9.8.2024.12.02.04.02.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Dec 2024 04:02:46 -0800 (PST) From: Bartosz Golaszewski Date: Mon, 02 Dec 2024 13:02:22 +0100 Subject: [PATCH RESEND v7 06/17] firmware: qcom: scm: add a call for deriving the software secret Precedence: bulk X-Mailing-List: linux-fscrypt@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241202-wrapped-keys-v7-6-67c3ca3f3282@linaro.org> References: <20241202-wrapped-keys-v7-0-67c3ca3f3282@linaro.org> In-Reply-To: <20241202-wrapped-keys-v7-0-67c3ca3f3282@linaro.org> To: Jens Axboe , Jonathan Corbet , Alasdair Kergon , Mike Snitzer , Mikulas Patocka , Adrian Hunter , Asutosh Das , Ritesh Harjani , Ulf Hansson , Alim Akhtar , Avri Altman , Bart Van Assche , "James E.J. Bottomley" , Gaurav Kashyap , Neil Armstrong , Dmitry Baryshkov , "Martin K. Petersen" , Eric Biggers , "Theodore Y. Ts'o" , Jaegeuk Kim , Alexander Viro , Christian Brauner , Jan Kara , Bjorn Andersson , Konrad Dybcio , Manivannan Sadhasivam Cc: linux-block@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, dm-devel@lists.linux.dev, linux-mmc@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fscrypt@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Bartosz Golaszewski X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=4754; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=wotGjX4ZTp3jBAnHlA+0tTqo+DEvuJKXXEnuWdkW8m0=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBnTaHTdc124fFeQJuf7Q4Szt+eF8iUREMbzDgTo ZfwiG+IpcCJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCZ02h0wAKCRARpy6gFHHX ctmGEADNdGvvGUYSlzGzUnBCi7/j35SwFxgaa6QN+8TI9JXd8mR3ZZ73L+Gmt7gpQym2/zRyEAl yF9/T9SK51RnNQvukU0EOstfpk9NWNgC2d/UtA8jk7/QqKPnhyny1XqDVqVpQlrPJAGY29KYjO/ ME4Nc4nzYQhFHaGF8+iadJD2oKXkgQLq1Z7ykIzTVLkqeaq79bHA3uhFwLCbhLq6HHvZD2K4GiY 96E2ByHsy5IA0qauyMOac6NmaXLo7WA8qqgThdJLsmjSCiOyWnLRpsdGlvvZXA4+58mhW/+JRU5 P1MadkpeijDlZ/Khp8aJdiTi7eu1yghd90ZgFMXCum14b/G2lzXSXxz8xhpETWtdpqSc7YLqF2+ pwPIiFY8lbELeKrUJY6oOeMXlbzlwY42/TI0rnYaymh+C0XgQGTrgJd1vWe6b70up1xJiwOeC4k NWBgKKYYfvMJXcqWW4CFRZIWlxsKt4h9PmKZ7VEC9BLe8aCwVnjcrvdC8RijQqXtPKtRGGOdFTN JkIuz5tVVVhwN+Sn5iYXMAT1Lhuu5iQRc4F4jawLqNLXO6gmzkQl9z1UsKQJzM7mdWLxIbZtlEe u9A095ThTUabhV8PLKo9qX8UaIhlpPnqgzlTmptY9kqpqdQNGy0pCpRSRCPGVGgIwhsngV3Uw/Z zE2EoBf2tLqlt9w== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Gaurav Kashyap Inline storage encryption may require deriving a software secret from storage keys added to the kernel. For raw keys, this can be directly done in the kernel as keys are not encrypted in memory. However, hardware wrapped keys can only be unwrapped by the HW wrapping entity. In case of Qualcomm's wrapped key solution, this is done by the Hardware Key Manager (HWKM) from Trustzone. Add a new SCM call which provides a hook to the software secret crypto profile API provided by the block layer. Tested-by: Neil Armstrong Signed-off-by: Gaurav Kashyap Reviewed-by: Dmitry Baryshkov Reviewed-by: Konrad Dybcio Signed-off-by: Bartosz Golaszewski --- drivers/firmware/qcom/qcom_scm.c | 65 ++++++++++++++++++++++++++++++++++ drivers/firmware/qcom/qcom_scm.h | 1 + include/linux/firmware/qcom/qcom_scm.h | 2 ++ 3 files changed, 68 insertions(+) diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c index 72bf87ddcd969..d523ce671997e 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -1279,6 +1279,71 @@ int qcom_scm_ice_set_key(u32 index, const u8 *key, u32 key_size, } EXPORT_SYMBOL_GPL(qcom_scm_ice_set_key); +/** + * qcom_scm_derive_sw_secret() - Derive software secret from wrapped key + * @wkey: the hardware wrapped key inaccessible to software + * @wkey_size: size of the wrapped key + * @sw_secret: the secret to be derived which is exactly the secret size + * @sw_secret_size: size of the sw_secret + * + * Derive a software secret from a hardware wrapped key for software crypto + * operations. + * For wrapped keys, the key needs to be unwrapped, in order to derive a + * software secret, which can be done in the hardware from a secure execution + * environment. + * + * For more information on sw secret, please refer to "Hardware-wrapped keys" + * section of Documentation/block/inline-encryption.rst. + * + * Return: 0 on success; -errno on failure. + */ +int qcom_scm_derive_sw_secret(const u8 *wkey, size_t wkey_size, + u8 *sw_secret, size_t sw_secret_size) +{ + struct qcom_scm_desc desc = { + .svc = QCOM_SCM_SVC_ES, + .cmd = QCOM_SCM_ES_DERIVE_SW_SECRET, + .arginfo = QCOM_SCM_ARGS(4, QCOM_SCM_RW, + QCOM_SCM_VAL, QCOM_SCM_RW, + QCOM_SCM_VAL), + .args[1] = wkey_size, + .args[3] = sw_secret_size, + .owner = ARM_SMCCC_OWNER_SIP, + }; + + int ret; + + void *wkey_buf __free(qcom_tzmem) = qcom_tzmem_alloc(__scm->mempool, + wkey_size, + GFP_KERNEL); + if (!wkey_buf) + return -ENOMEM; + + void *secret_buf __free(qcom_tzmem) = qcom_tzmem_alloc(__scm->mempool, + sw_secret_size, + GFP_KERNEL); + if (!secret_buf) { + ret = -ENOMEM; + goto out_free_wrapped; + } + + memcpy(wkey_buf, wkey, wkey_size); + desc.args[0] = qcom_tzmem_to_phys(wkey_buf); + desc.args[2] = qcom_tzmem_to_phys(secret_buf); + + ret = qcom_scm_call(__scm->dev, &desc, NULL); + if (!ret) + memcpy(sw_secret, secret_buf, sw_secret_size); + + memzero_explicit(secret_buf, sw_secret_size); + +out_free_wrapped: + memzero_explicit(wkey_buf, wkey_size); + + return ret; +} +EXPORT_SYMBOL_GPL(qcom_scm_derive_sw_secret); + /** * 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 e36b2f67607fc..55547ed27edd9 100644 --- a/drivers/firmware/qcom/qcom_scm.h +++ b/drivers/firmware/qcom/qcom_scm.h @@ -128,6 +128,7 @@ struct qcom_tzmem_pool *qcom_scm_get_tzmem_pool(void); #define QCOM_SCM_SVC_ES 0x10 /* Enterprise Security */ #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_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 4621aec0328c2..b843678bc3ee4 100644 --- a/include/linux/firmware/qcom/qcom_scm.h +++ b/include/linux/firmware/qcom/qcom_scm.h @@ -105,6 +105,8 @@ bool qcom_scm_ice_available(void); int qcom_scm_ice_invalidate_key(u32 index); 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); bool qcom_scm_hdcp_available(void); int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp);