From patchwork Fri Sep 6 18:07:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 13794643 Received: from mail-wm1-f48.google.com (mail-wm1-f48.google.com [209.85.128.48]) (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 E29791D86C6 for ; Fri, 6 Sep 2024 18:07:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.48 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725646055; cv=none; b=mhJUqjDQA2s+SOunLOMPW8u1u1wttPUTIdtWdu9Yc+mK3FcX/JTUm6pyou0c5bJ48oRoK84FuF/G5/tCch4P0zKZUnxa71qcE15XJcZ00gYGV1t6T/kgAKmzG50x3NTchnvVa5DxyaU0p6tsUh6JkMns6Ct9aVs4SVGuqQ+HWuA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725646055; c=relaxed/simple; bh=ilnQcQK5Wy1pBXzDgHykq4yCmc3ANcBFrm8jF1kC9ek=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=h4kCIEeEWIMoytclQsXmz9rFAbIWPC+tInJFIGIAtSIpDiKzneAcViuYH+rz3S265RQhBUC0KmwXPEdxVaEE5GA8CcFedu57hJFpMVIGl5LrdzI4FwtgKz7PLQmmHv87s2QUOYU3WKCUS9J94YxgH9OpCCsQwgpOd56/j1UAHuw= 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=tkhIcCUU; arc=none smtp.client-ip=209.85.128.48 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="tkhIcCUU" Received: by mail-wm1-f48.google.com with SMTP id 5b1f17b1804b1-42c7b5b2d01so24511995e9.3 for ; Fri, 06 Sep 2024 11:07:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20230601.gappssmtp.com; s=20230601; t=1725646048; x=1726250848; 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=dQvGanjtStSrRxyUv2DuAjHXlFYYXgU+MB1dIZTWF6s=; b=tkhIcCUUeRuUCeLoARgRmi3Df8GMuU1DTG2YALeZAiiuxY23M5taSh4c8RPuFJA4Qo 7P/l3HlOSqJlTMGbcAJK2A5w3+0ABKCtfFwIrtY7p1bPINcZnvR0i2bYE6AFynDw3htF pwUwOhJH+lWYZrmyoFi6qaUh91Gz8At7LWtPh81fqugnuktgyQRMOqMOz2AkA24SlVeQ WsIQZ/yg/Mom33Yq1DSLXUhfimEsMS1EwjFG6RSuLMRCovOB0/hEvOju+PTTXgKxUlT7 EZtnOCJ4HA3y9DaIe198oL8+Qk8OV86x402cp5gXz98H2iQ6/OKjduQbWP9xfSu0aSGp +E6A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725646048; x=1726250848; 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=dQvGanjtStSrRxyUv2DuAjHXlFYYXgU+MB1dIZTWF6s=; b=NODyz8rfDnZKqk9D8ty5FPvbAqq7cSSvzsz3EyMz0DIjvlTN9lVX5Nc2ifJxYIlZ6t 7E5qvQfocApqtB6BlGZtbbWAm1ntUv0NGYufTyQjas+8bufFkKH9qs5H51aU+p2uQTkt /VkG8nizE2+wP+drZPjyzgp7sZxgkq9TB/nj4wRNJHTT6vhwPRrT57Wi0niw2G/1IPLg gSWWWzOdywwrirsCt9UDyyObKE+SZmZALTFPs8uH3NCKgKzuhLrgHtJ+cCvOPJqmUV+R of5ATw6VURbM7+rxESCLv6lUQQI49u06pNiLlAalDoL2M7r4HQs1NwZalha4q8boQE5d Ftzg== X-Forwarded-Encrypted: i=1; AJvYcCXXcu1ZxC1o/o+yi7owD5t08l/CpfDMKBWRqQWVEfWyDJCDb5pm5AZ6e/LAYci+debSAtkGdcc3v3OA@vger.kernel.org X-Gm-Message-State: AOJu0Yx3bGeBkpO7FwJ6ozc+++FlJX7oG6XBakfzZCyiRUqzOciO85eK k+IVu1lO/diTOKSieWHUR4U4OFl/EJqsTH/RgfbNUhBMFaVrF7ftw/h+JJ0upKQ= X-Google-Smtp-Source: AGHT+IH1QkmmVpZO/Pg/SpdHahghFnMBF6YG+qG36mDKqoik5hsrq9KQuGm23VIxfOMfJ2FEjMd/oA== X-Received: by 2002:a05:600c:190a:b0:426:6857:3156 with SMTP id 5b1f17b1804b1-42c9f9e0a59mr26109775e9.27.1725646048056; Fri, 06 Sep 2024 11:07:28 -0700 (PDT) Received: from [127.0.1.1] ([2a01:cb1d:dc:7e00:b9fc:a1e7:588c:1e37]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42cac8543dbsm5880485e9.42.2024.09.06.11.07.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Sep 2024 11:07:27 -0700 (PDT) From: Bartosz Golaszewski Date: Fri, 06 Sep 2024 20:07:05 +0200 Subject: [PATCH v6 02/17] blk-crypto: show supported key types in sysfs Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240906-wrapped-keys-v6-2-d59e61bc0cb4@linaro.org> References: <20240906-wrapped-keys-v6-0-d59e61bc0cb4@linaro.org> In-Reply-To: <20240906-wrapped-keys-v6-0-d59e61bc0cb4@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" , "Martin K. Petersen" , Eric Biggers , "Theodore Y. Ts'o" , Jaegeuk Kim , Alexander Viro , Christian Brauner , Jan Kara , Bjorn Andersson , Konrad Dybcio , Manivannan Sadhasivam , Dmitry Baryshkov , Gaurav Kashyap , Neil Armstrong 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 , Eric Biggers X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4301; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=eXYBlq2yaUMqXfUV/YG7MSDNKrLWqz5dkzbaRWcU/Cc=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBm20TVnwtwifTOUUqDpse3yaEf0083Tld0LXqcP yPeS+XQL3KJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCZttE1QAKCRARpy6gFHHX ciC0EADE28MXIlmhSbAQubkeu0rl1fkMrZm7wS0+FZWiZlexMbPUcTpuopGXB6JcFueBC0BSY5E bcQb2m9KP4aeKRtyxPrHhJRoONO6bA+w0gz2fHRQei2MBSzLnaEnGuPAY4QyY+9wX5vn8REIJta J50e/zhcMQxnc9jKWh4dOGcKdhqL+KMZ0mooxMruJIS2NrzyWrx8QhMvUDawEpyySN3edMxMDZu 2xHAVJ2KxvB3QDqorZ405SucwvvVzGPvgLJTUVPfown9jsZ+3zp7uBI2D6o8Uc3I77fuwgHnQX/ UdrFej2XITQGR/uKV0i4fSkFhXYYT1H3EpWKw8vO09urTgzHFkk7DrmZ0/iGZkWBLWsPyW5jfPf qru+ODbVlG245gXMGR/L0t2zV5n+QTAhcHm+hTmBD4LxGf4n+517VQoc+fLoeUIlZJWRy7zLqiJ JEKKNrC0oga0/5oUOkEfJkxuwOLqEysDUitUoWfFK7CwOlXRn1wbHPT34CuOK9uVY5Fp39SIVI8 QVTuzfnoIqg7/4B4Cynifw8pj+FlmGwKFCf9IzQZK0pHtLoyFTFcUo3wzUh2c6iNvxo4pqkrNgr qfySMYNOXQNCTUujdWD0xdx8WJ4+QUJuxF27jII1dZzRHG2eRcsleqsuHS9UTrMiZo2GVELoBes JXm+M4MnGyvYzyQ== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Eric Biggers Add sysfs files that indicate which type(s) of keys are supported by the inline encryption hardware associated with a particular request queue: /sys/block/$disk/queue/crypto/hw_wrapped_keys /sys/block/$disk/queue/crypto/standard_keys Userspace can use the presence or absence of these files to decide what encyption settings to use. Don't use a single key_type file, as devices might support both key types at the same time. Signed-off-by: Eric Biggers Signed-off-by: Bartosz Golaszewski --- Documentation/ABI/stable/sysfs-block | 18 ++++++++++++++++++ block/blk-crypto-sysfs.c | 35 +++++++++++++++++++++++++++++++++++ 2 files changed, 53 insertions(+) diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block index cea8856f798d..609adb8dec0b 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -229,6 +229,16 @@ Description: encryption, refer to Documentation/block/inline-encryption.rst. +What: /sys/block//queue/crypto/hw_wrapped_keys +Contact: linux-block@vger.kernel.org +Description: + [RO] The presence of this file indicates that the device + supports hardware-wrapped inline encryption keys, i.e. key blobs + that can only be unwrapped and used by dedicated hardware. For + more information about hardware-wrapped inline encryption keys, + see Documentation/block/inline-encryption.rst. + + What: /sys/block//queue/crypto/max_dun_bits Date: February 2022 Contact: linux-block@vger.kernel.org @@ -267,6 +277,14 @@ Description: use with inline encryption. +What: /sys/block//queue/crypto/standard_keys +Contact: linux-block@vger.kernel.org +Description: + [RO] The presence of this file indicates that the device + supports standard inline encryption keys, i.e. keys that are + managed in raw, plaintext form in software. + + What: /sys/block//queue/dax Date: June 2016 Contact: linux-block@vger.kernel.org diff --git a/block/blk-crypto-sysfs.c b/block/blk-crypto-sysfs.c index a304434489ba..acab50493f2c 100644 --- a/block/blk-crypto-sysfs.c +++ b/block/blk-crypto-sysfs.c @@ -31,6 +31,13 @@ static struct blk_crypto_attr *attr_to_crypto_attr(struct attribute *attr) return container_of(attr, struct blk_crypto_attr, attr); } +static ssize_t hw_wrapped_keys_show(struct blk_crypto_profile *profile, + struct blk_crypto_attr *attr, char *page) +{ + /* Always show supported, since the file doesn't exist otherwise. */ + return sysfs_emit(page, "supported\n"); +} + static ssize_t max_dun_bits_show(struct blk_crypto_profile *profile, struct blk_crypto_attr *attr, char *page) { @@ -43,20 +50,48 @@ static ssize_t num_keyslots_show(struct blk_crypto_profile *profile, return sysfs_emit(page, "%u\n", profile->num_slots); } +static ssize_t standard_keys_show(struct blk_crypto_profile *profile, + struct blk_crypto_attr *attr, char *page) +{ + /* Always show supported, since the file doesn't exist otherwise. */ + return sysfs_emit(page, "supported\n"); +} + #define BLK_CRYPTO_RO_ATTR(_name) \ static struct blk_crypto_attr _name##_attr = __ATTR_RO(_name) +BLK_CRYPTO_RO_ATTR(hw_wrapped_keys); BLK_CRYPTO_RO_ATTR(max_dun_bits); BLK_CRYPTO_RO_ATTR(num_keyslots); +BLK_CRYPTO_RO_ATTR(standard_keys); + +static umode_t blk_crypto_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct blk_crypto_profile *profile = kobj_to_crypto_profile(kobj); + struct blk_crypto_attr *a = attr_to_crypto_attr(attr); + + if (a == &hw_wrapped_keys_attr && + !(profile->key_types_supported & BLK_CRYPTO_KEY_TYPE_HW_WRAPPED)) + return 0; + if (a == &standard_keys_attr && + !(profile->key_types_supported & BLK_CRYPTO_KEY_TYPE_STANDARD)) + return 0; + + return 0444; +} static struct attribute *blk_crypto_attrs[] = { + &hw_wrapped_keys_attr.attr, &max_dun_bits_attr.attr, &num_keyslots_attr.attr, + &standard_keys_attr.attr, NULL, }; static const struct attribute_group blk_crypto_attr_group = { .attrs = blk_crypto_attrs, + .is_visible = blk_crypto_is_visible, }; /*