From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brijesh Singh Subject: [Part2 PATCH v5.1 12.7/31] crypto: ccp: Implement SEV_PEK_CSR ioctl command Date: Fri, 6 Oct 2017 20:06:05 -0500 Message-ID: <20171007010607.78088-7-brijesh.singh@amd.com> References: <20171004131412.13038-13-brijesh.singh@amd.com> <20171007010607.78088-1-brijesh.singh@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Brijesh Singh , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Herbert Xu , Gary Hook , Tom Lendacky , linux-crypto@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org To: bp@suse.de Return-path: Received: from mail-sn1nam01on0081.outbound.protection.outlook.com ([104.47.32.81]:49120 "EHLO NAM01-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753137AbdJGBGa (ORCPT ); Fri, 6 Oct 2017 21:06:30 -0400 In-Reply-To: <20171007010607.78088-1-brijesh.singh@amd.com> Sender: linux-crypto-owner@vger.kernel.org List-ID: The SEV_PEK_CSR command can be used to generate a PEK certificate signing request. The command is defined in SEV spec section 5.7. Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Borislav Petkov Cc: Herbert Xu Cc: Gary Hook Cc: Tom Lendacky Cc: linux-crypto@vger.kernel.org Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Brijesh Singh --- drivers/crypto/ccp/psp-dev.c | 85 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c index 28efb7a9245a..8038ca7aef03 100644 --- a/drivers/crypto/ccp/psp-dev.c +++ b/drivers/crypto/ccp/psp-dev.c @@ -299,6 +299,87 @@ static int sev_ioctl_pdh_gen(struct sev_issue_cmd *argp) return ret; } +static int sev_ioctl_pek_csr(struct sev_issue_cmd *argp) +{ + struct sev_user_data_pek_csr input; + struct sev_data_pek_csr *data; + int do_shutdown = 0; + int ret, state; + void *blob; + + if (copy_from_user(&input, (void __user *)(uintptr_t)argp->data, + sizeof(struct sev_user_data_pek_csr))) + return -EFAULT; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + /* allocate a temporary physical contigous buffer to store the CSR blob */ + blob = NULL; + if (input.address) { + if (!access_ok(VERIFY_WRITE, input.address, input.length) || + input.length > SEV_FW_BLOB_MAX_SIZE) { + ret = -EFAULT; + goto e_free; + } + + blob = kmalloc(input.length, GFP_KERNEL); + if (!blob) { + ret = -ENOMEM; + goto e_free; + } + + data->address = __psp_pa(blob); + data->len = input.length; + } + + ret = sev_platform_get_state(&state, &argp->error); + if (ret) + goto e_free_blob; + + /* + * PEK_CERT command can be issued only when we are in INIT state. + * if current state is WORKING then reject it, if state is UNINIT + * then transition the platform to INIT state before issuing the + * command. + */ + if (state == SEV_STATE_WORKING) { + ret = -EBUSY; + goto e_free_blob; + } else if (state == SEV_STATE_UNINIT) { + ret = sev_firmware_init(&argp->error); + if (ret) + goto e_free_blob; + do_shutdown = 1; + } + + ret = sev_handle_cmd(SEV_CMD_PEK_CSR, data, &argp->error); + + input.length = data->len; + + /* copy blob to userspace */ + if (blob && + copy_to_user((void __user *)(uintptr_t)input.address, + blob, input.length)) { + ret = -EFAULT; + goto e_shutdown; + } + + if (copy_to_user((void __user *)(uintptr_t)argp->data, &input, + sizeof(struct sev_user_data_pek_csr))) + ret = -EFAULT; + +e_shutdown: + if (do_shutdown) + sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL); +e_free_blob: + kfree(blob); +e_free: + kfree(data); + return ret; +} + static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) { void __user *argp = (void __user *)arg; @@ -332,6 +413,10 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) ret = sev_ioctl_pdh_gen(&input); break; } + case SEV_PEK_CSR: { + ret = sev_ioctl_pek_csr(&input); + break; + } default: ret = -EINVAL; break; -- 2.9.5