From patchwork Thu Aug 8 00:12:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 11082997 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E83BF1709 for ; Thu, 8 Aug 2019 00:12:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D9F7B28AD2 for ; Thu, 8 Aug 2019 00:12:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CE3E728AD5; Thu, 8 Aug 2019 00:12:59 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham 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 7F48728AD3 for ; Thu, 8 Aug 2019 00:12:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730302AbfHHAM7 (ORCPT ); Wed, 7 Aug 2019 20:12:59 -0400 Received: from mga09.intel.com ([134.134.136.24]:51237 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730038AbfHHAM7 (ORCPT ); Wed, 7 Aug 2019 20:12:59 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Aug 2019 17:12:58 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,358,1559545200"; d="scan'208";a="165519366" Received: from sjchrist-coffee.jf.intel.com ([10.54.74.41]) by orsmga007.jf.intel.com with ESMTP; 07 Aug 2019 17:12:58 -0700 From: Sean Christopherson To: Jarkko Sakkinen Cc: linux-sgx@vger.kernel.org, Shay Katz-zamir , Serge Ayoun Subject: [PATCH for_v22 08/11] x86/sgx: Do not free enclave resources on redundant ECREATE Date: Wed, 7 Aug 2019 17:12:51 -0700 Message-Id: <20190808001254.11926-9-sean.j.christopherson@intel.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190808001254.11926-1-sean.j.christopherson@intel.com> References: <20190808001254.11926-1-sean.j.christopherson@intel.com> MIME-Version: 1.0 Sender: linux-sgx-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Fix a bug where sgx_encl_create() incorrectly frees the enclave's SECS and backing storage when the enclave has already been created. Freeing the structures leads to various forms of faults due to dereferencing null pointers. Signed-off-by: Sean Christopherson Acked-by: Jarkko Sakkinen --- arch/x86/kernel/cpu/sgx/driver/ioctl.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/sgx/driver/ioctl.c b/arch/x86/kernel/cpu/sgx/driver/ioctl.c index 700d65c96b9a..18f6925ab2ed 100644 --- a/arch/x86/kernel/cpu/sgx/driver/ioctl.c +++ b/arch/x86/kernel/cpu/sgx/driver/ioctl.c @@ -277,7 +277,7 @@ static int sgx_encl_create(struct sgx_encl *encl, struct sgx_secs *secs) if (encl->flags & SGX_ENCL_CREATED) { ret = -EFAULT; - goto err_out; + goto err_out_unlock; } ssaframesize = sgx_calc_ssaframesize(secs->miscselect, secs->xfrm); @@ -348,6 +348,7 @@ static int sgx_encl_create(struct sgx_encl *encl, struct sgx_secs *secs) encl->backing = NULL; } +err_out_unlock: mutex_unlock(&encl->lock); return ret; }