From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brijesh Singh Subject: [Part2 PATCH v5.1 12.9/31] crypto: ccp: Implement SEV_PDH_CERT_EXPORT ioctl command Date: Fri, 6 Oct 2017 20:06:07 -0500 Message-ID: <20171007010607.78088-9-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: In-Reply-To: <20171007010607.78088-1-brijesh.singh@amd.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org The SEV_PDH_CERT_EXPORT command can be used to export the PDH and its certificate chain. The command is defined in SEV spec section 5.10. 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 | 110 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 110 insertions(+) diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c index 861c44bf2910..0a069e3c7b8c 100644 --- a/drivers/crypto/ccp/psp-dev.c +++ b/drivers/crypto/ccp/psp-dev.c @@ -473,6 +473,112 @@ static int sev_ioctl_pek_cert_import(struct sev_issue_cmd *argp) return ret; } +static int sev_ioctl_pdh_cert_export(struct sev_issue_cmd *argp) +{ + struct sev_user_data_pdh_cert_export input; + struct sev_data_pdh_cert_export *data; + int ret, state, need_shutdown = 0; + void *pdh_blob, *cert_blob; + + if (copy_from_user(&input, (void __user *)(uintptr_t)argp->data, + sizeof(struct sev_user_data_pdh_cert_export))) + return -EFAULT; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + pdh_blob = NULL; + if (input.pdh_cert_address) { + if (!access_ok(VERIFY_WRITE, input.pdh_cert_address, input.pdh_cert_len) || + (input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE)) { + ret = -EFAULT; + goto e_free; + } + + pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL); + if (!pdh_blob) { + ret = -ENOMEM; + goto e_free; + } + + data->pdh_cert_address = __psp_pa(pdh_blob); + data->pdh_cert_len = input.pdh_cert_len; + } + + cert_blob = NULL; + if (input.cert_chain_address) { + if (!access_ok(VERIFY_WRITE, input.cert_chain_address, input.cert_chain_len) || + (input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE)) { + ret = -EFAULT; + goto e_free_pdh; + } + + cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL); + if (!cert_blob) { + ret = -ENOMEM; + goto e_free_pdh; + } + + data->cert_chain_address = __psp_pa(cert_blob); + data->cert_chain_len = input.cert_chain_len; + } + + ret = sev_platform_get_state(&state, &argp->error); + if (ret) + goto e_free_cert; + + /* + * CERT_EXPORT command can be issued in INIT or WORKING state. + * If we are in UNINIT state then transition to INIT. + */ + if (state == SEV_STATE_UNINIT) { + ret = sev_firmware_init(&argp->error); + if (ret) + goto e_free_cert; + + need_shutdown = 1; + } + + ret = sev_handle_cmd(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error); + + input.cert_chain_len = data->cert_chain_len; + input.pdh_cert_len = data->pdh_cert_len; + + /* copy certificate length to userspace */ + if (copy_to_user((void __user *)(uintptr_t)argp->data, &input, + sizeof(struct sev_user_data_pdh_cert_export))) + ret = -EFAULT; + + if (ret) + goto e_shutdown; + + /* copy PDH certificate to userspace */ + if (pdh_blob && + copy_to_user((void __user *)(uintptr_t)input.pdh_cert_address, + pdh_blob, input.pdh_cert_len)) { + ret = -EFAULT; + goto e_shutdown; + } + + /* copy certificate chain to userspace */ + if (cert_blob && + copy_to_user((void __user *)(uintptr_t)input.cert_chain_address, + cert_blob, input.cert_chain_len)) + ret = -EFAULT; + +e_shutdown: + if (need_shutdown) + sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL); +e_free_cert: + kfree(cert_blob); +e_free_pdh: + kfree(pdh_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; @@ -514,6 +620,10 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) ret = sev_ioctl_pek_cert_import(&input); break; } + case SEV_PDH_CERT_EXPORT: { + ret = sev_ioctl_pdh_cert_export(&input); + break; + } default: ret = -EINVAL; break; -- 2.9.5