From patchwork Sat Nov 2 06:22:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 840310 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 0BA719474; Sat, 2 Nov 2024 06:23:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730528592; cv=none; b=srAKK/6tTLk6MeZbE5fOtUC+yUc2yHxpEKNjGMBaK/jF7Eh4msSVcPGPZl//iMNtZGpeKd4K70vc1fThGEPM5Nr1AOw0g4i/2DW/urbf6U61OzNWYAmRqUHsWXulxyz/epzr3nXXwqLzfawPuh33ziRl65TH5YJ46MaFt8waJtk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730528592; c=relaxed/simple; bh=gzlKGnvzGZzthTS3QitaJ2eHRSt7oYdMJoKnxawWJRk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gOsiUp3ByfA4ncEJ3OsFtbL4MEkgZ0GtR4F0c7l+VA4DU52ZThJbxa6L6NYkGUR/1z3vIXLRHQmdJPwhIL11L+NBFG8S89XMmGdegLqdBFtdV7D2meQJHHrW9Ygf5gPx/tQ80WeD6AAxPScVZglU73GQkKhCKqnowUp/DPANaAc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mb4eV9y8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mb4eV9y8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D929BC4CEC3; Sat, 2 Nov 2024 06:23:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730528591; bh=gzlKGnvzGZzthTS3QitaJ2eHRSt7oYdMJoKnxawWJRk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mb4eV9y89dfN9oOHM4OhAI4OQ9Cj+BXbnE3G1iP+z3SxUwpusj+9d70QI2O0L1xsr D4ZpzGO5RyHqIe1AmcaEw2Q5a61TKTWIxJAkezKtKzPKOBI1geuWEsZsQpYfRrFF3A TGBu4UpN+3rMyk0FvZFAEvQ23i0qvzOY0W15n1sj+Pa7LBMnYql5a8YOkIpxDzyzNs MZQkrqibQSz+pxBRvg0g2FwLcG2VVMQyiYlVwdQm6X7HQ/2Xpon6NHMiPrZg/o1jv8 3Ga0mxAkfPcjbBy8BwIM0kRg37tuS8DNeDQ0VUPNCGJ/oTC1X77l59oakmKgdmzPBC BRp8JCbfcljXg== From: Jarkko Sakkinen To: jarkko@kernel.org, Jonathan Corbet , Peter Huewe , Jason Gunthorpe Cc: James.Bottomley@hansenpartnership.com, andrew.cooper3@citrix.com, ardb@kernel.org, baolu.lu@linux.intel.com, bp@alien8.de, dave.hansen@linux.intel.com, davem@davemloft.net, dpsmith@apertussolutions.com, dwmw2@infradead.org, ebiederm@xmission.com, herbert@gondor.apana.org.au, hpa@zytor.com, iommu@lists.linux-foundation.org, kanth.ghatraju@oracle.com, kexec@lists.infradead.org, linux-crypto@vger.kernel.org, linux-doc@vger.kernel.org, linux-efi@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, luto@amacapital.net, mingo@redhat.com, mjg59@srcf.ucam.org, nivedita@alum.mit.edu, ross.philipson@oracle.com, tglx@linutronix.de, trenchboot-devel@googlegroups.com, x86@kernel.org Subject: [RFC PATCH v2 1/2] tpm, tpm_tis: Introduce TPM_IOC_SET_LOCALITY Date: Sat, 2 Nov 2024 08:22:56 +0200 Message-ID: <20241102062259.2521361-1-jarkko@kernel.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-efi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 DRTM needs to be able to set the locality used by kernel. Provide TPM_IOC_SET_LOCALITY operation for this purpose. It is enabled only if the kernel command-line has 'tpm.set_locality_enabled=1'. The operation is one-shot allowed only for tpm_tis for the moment. Signed-off-by: Jarkko Sakkinen --- v2: - Do not ignore the return value of tpm_ioc_set_locality(). - if (!(chip->flags & TPM_CHIP_FLAG_SET_LOCALITY_ENABLED)) - Refined kernel-parameters.txt description. - Use __u8 instead of u8 in the uapi. - Tested with https://codeberg.org/jarkko/tpm-set-locality-test/src/branch/main/src/main.rs v1: - NOTE: Only compile-tested. --- .../admin-guide/kernel-parameters.txt | 5 ++ .../userspace-api/ioctl/ioctl-number.rst | 2 + drivers/char/tpm/tpm-chip.c | 2 +- drivers/char/tpm/tpm-dev.c | 70 +++++++++++++++++++ drivers/char/tpm/tpm_tis_core.c | 2 + include/linux/tpm.h | 10 +++ include/uapi/linux/tpm.h | 11 +++ 7 files changed, 101 insertions(+), 1 deletion(-) create mode 100644 include/uapi/linux/tpm.h diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 1518343bbe22..8fd9fc94c883 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6727,6 +6727,11 @@ torture.verbose_sleep_duration= [KNL] Duration of each verbose-printk() sleep in jiffies. + tpm.set_locality_enabled= [HW,TPM] + Enable one-shot locality setting after the boot. The + operation can be performed with TPM_IOC_SET_LOCALITY + applied to /dev/tpm0. The default value is 0. + tpm_suspend_pcr=[HW,TPM] Format: integer pcr id Specify that at suspend time, the tpm driver diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst index e4be1378ba26..3eba57ab2fb1 100644 --- a/Documentation/userspace-api/ioctl/ioctl-number.rst +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst @@ -338,6 +338,8 @@ Code Seq# Include File Comments 0xA3 90-9F linux/dtlk.h 0xA4 00-1F uapi/linux/tee.h Generic TEE subsystem 0xA4 00-1F uapi/asm/sgx.h +0xA4 00-1F uapi/linux/tpm.h TPM + 0xA5 01-05 linux/surface_aggregator/cdev.h Microsoft Surface Platform System Aggregator 0xA5 20-2F linux/surface_aggregator/dtx.h Microsoft Surface DTX driver diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 7df7abaf3e52..c8016342352a 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -44,7 +44,7 @@ static int tpm_request_locality(struct tpm_chip *chip) if (!chip->ops->request_locality) return 0; - rc = chip->ops->request_locality(chip, 0); + rc = chip->ops->request_locality(chip, chip->default_locality); if (rc < 0) return rc; diff --git a/drivers/char/tpm/tpm-dev.c b/drivers/char/tpm/tpm-dev.c index 97c94b5e9340..d07aec98f894 100644 --- a/drivers/char/tpm/tpm-dev.c +++ b/drivers/char/tpm/tpm-dev.c @@ -13,8 +13,74 @@ * Device file system interface to the TPM */ #include +#include #include "tpm-dev.h" +static bool set_locality_enabled; +module_param(set_locality_enabled, bool, 0644); + +/* + * Set a locality as a one-shot operation. A chip must declare support for it + * with %TPM_CHIP_FLAG_SET_LOCALITY_ENABLED, which will cleared after setting + * the locality. + */ +static long tpm_ioc_set_locality(struct tpm_chip *chip, u8 __user *localityp) +{ + u8 locality; + + if (!set_locality_enabled) + return -ENOIOCTLCMD; + + if (!(chip->flags & TPM_CHIP_FLAG_SET_LOCALITY_ENABLED)) + return -EOPNOTSUPP; + + if (copy_from_user(&locality, localityp, sizeof(locality))) + return -EFAULT; + + if (locality >= TPM_MAX_LOCALITY) + return -EINVAL; + + chip->default_locality = locality; + chip->flags &= ~TPM_CHIP_FLAG_SET_LOCALITY_ENABLED; + return 0; +} + +static long tpm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct file_priv *priv = file->private_data; + void __user *argp = (void __user *)arg; + struct tpm_chip *chip = priv->chip; + int ret; + + mutex_lock(&priv->buffer_mutex); + + ret = tpm_try_get_ops(chip); + if (ret) + goto out; + + switch (cmd) { + case TPM_IOC_SET_LOCALITY: + ret = tpm_ioc_set_locality(chip, argp); + break; + default: + ret = -ENOIOCTLCMD; + break; + } + + tpm_put_ops(chip); + +out: + mutex_unlock(&priv->buffer_mutex); + return 0; +} + +#ifdef CONFIG_COMPAT +static long tpm_compat_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) +{ + return tpm_ioctl(filep, cmd, arg); +} +#endif + static int tpm_open(struct inode *inode, struct file *file) { struct tpm_chip *chip; @@ -59,6 +125,10 @@ static int tpm_release(struct inode *inode, struct file *file) const struct file_operations tpm_fops = { .owner = THIS_MODULE, + .unlocked_ioctl = tpm_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = tpm_compat_ioctl, +#endif .open = tpm_open, .read = tpm_common_read, .write = tpm_common_write, diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index fdef214b9f6b..3517db710423 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -1111,6 +1111,8 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq, if (IS_ERR(chip)) return PTR_ERR(chip); + chip->flags |= TPM_CHIP_FLAG_SET_LOCALITY_ENABLED; + #ifdef CONFIG_ACPI chip->acpi_dev_handle = acpi_dev_handle; #endif diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 587b96b4418e..27071ef13b7a 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -147,6 +147,12 @@ struct tpm_chip_seqops { */ #define TPM2_MAX_CONTEXT_SIZE 4096 +/* + * The maximum locality (0 - 4) for a TPM, as defined in section 3.2 of the + * Client Platform Profile Specification. + */ +#define TPM_MAX_LOCALITY 4 + struct tpm_chip { struct device dev; struct device devs; @@ -202,6 +208,9 @@ struct tpm_chip { /* active locality */ int locality; + /* the default locality used by the kernel (default 0) */ + u8 default_locality; + #ifdef CONFIG_TCG_TPM2_HMAC /* details for communication security via sessions */ @@ -348,6 +357,7 @@ enum tpm_chip_flags { TPM_CHIP_FLAG_SUSPENDED = BIT(8), TPM_CHIP_FLAG_HWRNG_DISABLED = BIT(9), TPM_CHIP_FLAG_DISABLE = BIT(10), + TPM_CHIP_FLAG_SET_LOCALITY_ENABLED = BIT(11), }; #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev) diff --git a/include/uapi/linux/tpm.h b/include/uapi/linux/tpm.h new file mode 100644 index 000000000000..73485a184f14 --- /dev/null +++ b/include/uapi/linux/tpm.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI_TPM_H +#define _UAPI_TPM_H + +#include +#include + +#define TPM_MAGIC 0xA4 +#define TPM_IOC_SET_LOCALITY _IOW(TPM_MAGIC, 0x00, __u8) + +#endif /* _UAPI_TPM_H */