From patchwork Thu Oct 12 19:53:31 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Borislav Petkov X-Patchwork-Id: 10002733 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7ED45602BF for ; Thu, 12 Oct 2017 19:54:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 713E728DD2 for ; Thu, 12 Oct 2017 19:54:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6506E28E72; Thu, 12 Oct 2017 19:54:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E065828DD2 for ; Thu, 12 Oct 2017 19:54:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752877AbdJLTxq (ORCPT ); Thu, 12 Oct 2017 15:53:46 -0400 Received: from mx2.suse.de ([195.135.220.15]:47614 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751348AbdJLTxp (ORCPT ); Thu, 12 Oct 2017 15:53:45 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 01BC1AB9D; Thu, 12 Oct 2017 19:53:42 +0000 (UTC) Date: Thu, 12 Oct 2017 21:53:31 +0200 From: Borislav Petkov To: Brijesh Singh Cc: Paolo Bonzini , Radim =?utf-8?B?S3LEjW3DocWZ?= , Herbert Xu , Gary Hook , Tom Lendacky , linux-crypto@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [Part2 PATCH v5.1 12.7/31] crypto: ccp: Implement SEV_PEK_CSR ioctl command Message-ID: <20171012195331.bdzwqzyrjc6fi5lj@pd.tnic> References: <20171004131412.13038-13-brijesh.singh@amd.com> <20171007010607.78088-1-brijesh.singh@amd.com> <20171007010607.78088-7-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20171007010607.78088-7-brijesh.singh@amd.com> User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On Fri, Oct 06, 2017 at 08:06:05PM -0500, Brijesh Singh wrote: > 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(+) Ok, a couple of things here: * Move the checks first and the allocations second so that you allocate memory only after all checks have been passed and you don't allocate pointlessly. * That: 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; } is a repeating pattern. Perhaps it should be called sev_firmware_reinit() and called by other functions. * The rest is simplifications and streamlining. diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c index e3ee68afd068..d41f5448a25b 100644 --- a/drivers/crypto/ccp/psp-dev.c +++ b/drivers/crypto/ccp/psp-dev.c @@ -302,33 +302,30 @@ static int sev_ioctl_pek_csr(struct sev_issue_cmd *argp) int ret, state; void *blob; - if (copy_from_user(&input, (void __user *)(uintptr_t)argp->data, - sizeof(struct sev_user_data_pek_csr))) + if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) + return -EFAULT; + + if (!input.address) + return -EINVAL; + + /* allocate a physically contiguous buffer to store the CSR blob */ + if (!access_ok(VERIFY_WRITE, input.address, input.length) || + input.length > SEV_FW_BLOB_MAX_SIZE) 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; + 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; @@ -349,25 +346,23 @@ static int sev_ioctl_pek_csr(struct sev_issue_cmd *argp) do_shutdown = 1; } - ret = sev_handle_cmd(SEV_CMD_PEK_CSR, data, &argp->error); + ret = sev_do_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)) { + if (copy_to_user((void __user *)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))) + if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) ret = -EFAULT; e_shutdown: if (do_shutdown) - sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL); + ret = sev_do_cmd(SEV_CMD_SHUTDOWN, 0, NULL); + e_free_blob: kfree(blob); e_free: @@ -408,10 +403,10 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) ret = sev_ioctl_pdh_gen(&input); break; - case SEV_PEK_CSR: { + case SEV_PEK_CSR: ret = sev_ioctl_pek_csr(&input); break; - } + default: ret = -EINVAL; goto out;