linux-kernel - [PATCH v6 14/17] ufs: core: add support for generating, importing and preparing keys

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Message-Id: <20240906-wrapped-keys-v6-14-d59e61bc0cb4@linaro.org>
Date: Fri, 06 Sep 2024 20:07:17 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Jens Axboe <axboe@...nel.dk>, Jonathan Corbet <corbet@....net>, 
 Alasdair Kergon <agk@...hat.com>, Mike Snitzer <snitzer@...nel.org>, 
 Mikulas Patocka <mpatocka@...hat.com>, 
 Adrian Hunter <adrian.hunter@...el.com>, 
 Asutosh Das <quic_asutoshd@...cinc.com>, 
 Ritesh Harjani <ritesh.list@...il.com>, 
 Ulf Hansson <ulf.hansson@...aro.org>, Alim Akhtar <alim.akhtar@...sung.com>, 
 Avri Altman <avri.altman@....com>, Bart Van Assche <bvanassche@....org>, 
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>, 
 Eric Biggers <ebiggers@...nel.org>, "Theodore Y. Ts'o" <tytso@....edu>, 
 Jaegeuk Kim <jaegeuk@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Gaurav Kashyap <quic_gaurkash@...cinc.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>
Cc: linux-block@...r.kernel.org, linux-doc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, dm-devel@...ts.linux.dev, 
 linux-mmc@...r.kernel.org, linux-scsi@...r.kernel.org, 
 linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
 Om Prakash Singh <quic_omprsing@...cinc.com>
Subject: [PATCH v6 14/17] ufs: core: add support for generating, importing
 and preparing keys

From: Gaurav Kashyap <quic_gaurkash@...cinc.com>

The block layer now allows storage controllers to implement the
operations for handling wrapped keys. We can now extend the UFS core to
also support them by reaching into the block layer. Add hooks
corresponding with the existing crypto operations lower on the stack.

Tested-by: Neil Armstrong <neil.armstrong@...aro.org>
Reviewed-by: Om Prakash Singh <quic_omprsing@...cinc.com>
Signed-off-by: Gaurav Kashyap <quic_gaurkash@...cinc.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/ufs/core/ufshcd-crypto.c | 41 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/drivers/ufs/core/ufshcd-crypto.c b/drivers/ufs/core/ufshcd-crypto.c
index 2530239d42af..49c0784f2432 100644
--- a/drivers/ufs/core/ufshcd-crypto.c
+++ b/drivers/ufs/core/ufshcd-crypto.c
@@ -145,10 +145,51 @@ bool ufshcd_crypto_enable(struct ufs_hba *hba)
 	return true;
 }

+static int ufshcd_crypto_generate_key(struct blk_crypto_profile *profile,
+				      u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
+{
+	struct ufs_hba *hba =
+		container_of(profile, struct ufs_hba, crypto_profile);
+
+	if (hba->vops && hba->vops->generate_key)
+		return hba->vops->generate_key(hba, lt_key);
+
+	return -EOPNOTSUPP;
+}
+
+static int ufshcd_crypto_prepare_key(struct blk_crypto_profile *profile,
+				     const u8 *lt_key, size_t lt_key_size,
+				     u8 eph_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
+{
+	struct ufs_hba *hba =
+		container_of(profile, struct ufs_hba, crypto_profile);
+
+	if (hba->vops && hba->vops->prepare_key)
+		return hba->vops->prepare_key(hba, lt_key, lt_key_size, eph_key);
+
+	return -EOPNOTSUPP;
+}
+
+static int ufshcd_crypto_import_key(struct blk_crypto_profile *profile,
+				    const u8 *imp_key, size_t imp_key_size,
+				    u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
+{
+	struct ufs_hba *hba =
+		container_of(profile, struct ufs_hba, crypto_profile);
+
+	if (hba->vops && hba->vops->import_key)
+		return hba->vops->import_key(hba, imp_key, imp_key_size, lt_key);
+
+	return -EOPNOTSUPP;
+}
+
 static const struct blk_crypto_ll_ops ufshcd_crypto_ops = {
 	.keyslot_program	= ufshcd_crypto_keyslot_program,
 	.keyslot_evict		= ufshcd_crypto_keyslot_evict,
 	.derive_sw_secret	= ufshcd_crypto_derive_sw_secret,
+	.generate_key		= ufshcd_crypto_generate_key,
+	.prepare_key		= ufshcd_crypto_prepare_key,
+	.import_key		= ufshcd_crypto_import_key,
 };

 static enum blk_crypto_mode_num

-- 
2.43.0