From patchwork Mon Aug 19 15:25:44 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 11101289 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 7AD0313A0 for ; Mon, 19 Aug 2019 15:26:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6A9DB288C5 for ; Mon, 19 Aug 2019 15:26:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5E574288B2; Mon, 19 Aug 2019 15:26:09 +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 BE9A62866D for ; Mon, 19 Aug 2019 15:26:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726628AbfHSP0I (ORCPT ); Mon, 19 Aug 2019 11:26:08 -0400 Received: from mga14.intel.com ([192.55.52.115]:9895 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726211AbfHSP0I (ORCPT ); Mon, 19 Aug 2019 11:26:08 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Aug 2019 08:26:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,405,1559545200"; d="scan'208";a="180393095" Received: from jsakkine-mobl1.tm.intel.com (HELO localhost) ([10.237.50.125]) by orsmga003.jf.intel.com with ESMTP; 19 Aug 2019 08:26:05 -0700 From: Jarkko Sakkinen To: linux-sgx@vger.kernel.org Cc: Jarkko Sakkinen , Sean Christopherson , Shay Katz-zamir , Serge Ayoun Subject: [PATCH 5/5] x86/sgx: Rename vm_prot_bits as max_vm_flags Date: Mon, 19 Aug 2019 18:25:44 +0300 Message-Id: <20190819152544.7296-6-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190819152544.7296-1-jarkko.sakkinen@linux.intel.com> References: <20190819152544.7296-1-jarkko.sakkinen@linux.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 vm_prot_bits is very bad and misleading name for the field in struct sgx_encl_page. What the field contains exactly is not @prot of mprotect() but the *maximum* VM flags for the VMA that contains the given enclave page. Thus, the only viable name for the field is max_vm_flags. In functions that also pass VM flags the parameter name is renamed from vm_prot_bits to vm_flags. To summarize, this commit makes two improvements to clarify the permission handling: 1. Changes the name to match better the contents. 2. Uses naming to differentiate the field inside the struct and the parameter passed to functions. Cc: Sean Christopherson Cc: Shay Katz-zamir Cc: Serge Ayoun Signed-off-by: Jarkko Sakkinen --- arch/x86/kernel/cpu/sgx/driver/ioctl.c | 2 +- arch/x86/kernel/cpu/sgx/encl.c | 14 +++++++------- arch/x86/kernel/cpu/sgx/encl.h | 4 ++-- 3 files changed, 10 insertions(+), 10 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/driver/ioctl.c b/arch/x86/kernel/cpu/sgx/driver/ioctl.c index 2415dcb20a6e..b61e06daad6e 100644 --- a/arch/x86/kernel/cpu/sgx/driver/ioctl.c +++ b/arch/x86/kernel/cpu/sgx/driver/ioctl.c @@ -261,7 +261,7 @@ static struct sgx_encl_page *sgx_encl_page_alloc(struct sgx_encl *encl, encl_page->encl = encl; /* Calculate maximum of the VM flags for the page. */ - encl_page->vm_prot_bits = calc_vm_prot_bits(prot, 0); + encl_page->max_vm_flags = calc_vm_prot_bits(prot, 0); ret = radix_tree_insert(&encl->page_tree, PFN_DOWN(encl_page->desc), encl_page); diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c index a20d498e9dcd..890eacb45a80 100644 --- a/arch/x86/kernel/cpu/sgx/encl.c +++ b/arch/x86/kernel/cpu/sgx/encl.c @@ -292,25 +292,25 @@ static unsigned int sgx_vma_fault(struct vm_fault *vmf) * @encl: an enclave * @start: lower bound of the address range, inclusive * @end: upper bound of the address range, exclusive - * @vm_prot_bits: requested protections of the address range + * @vm_flags: requested VM flags for the address range * * Iterate through the enclave pages contained within [@start, @end) to verify - * the permissions requested by @vm_prot_bits do not exceed that of any enclave - * page to be mapped. Page addresses that do not have an associated enclave - * page are interpreted to zero permissions. + * the the VM flags do not exceed that of any enclave page to be mapped. Page + * addresses that do not have an associated enclave page are interpreted to zero + * permissions. * * Return: * 0 on success, * -EACCES if VMA permissions exceed enclave page permissions */ int sgx_encl_may_map(struct sgx_encl *encl, unsigned long start, - unsigned long end, unsigned long vm_prot_bits) + unsigned long end, unsigned long vm_flags) { unsigned long idx, idx_start, idx_end; struct sgx_encl_page *page; /* PROT_NONE always succeeds. */ - if (!vm_prot_bits) + if (!vm_flags) return 0; idx_start = PFN_DOWN(start); @@ -321,7 +321,7 @@ int sgx_encl_may_map(struct sgx_encl *encl, unsigned long start, page = radix_tree_lookup(&encl->page_tree, idx); mutex_unlock(&encl->lock); - if (!page || (~page->vm_prot_bits & vm_prot_bits)) + if (!page || (~page->max_vm_flags & vm_flags)) return -EACCES; } diff --git a/arch/x86/kernel/cpu/sgx/encl.h b/arch/x86/kernel/cpu/sgx/encl.h index d3a1687ed84c..0e28b784a8c5 100644 --- a/arch/x86/kernel/cpu/sgx/encl.h +++ b/arch/x86/kernel/cpu/sgx/encl.h @@ -44,7 +44,7 @@ enum sgx_encl_page_desc { struct sgx_encl_page { unsigned long desc; - unsigned long vm_prot_bits; + unsigned long max_vm_flags; struct sgx_epc_page *epc_page; struct sgx_va_page *va_page; struct sgx_encl *encl; @@ -134,6 +134,6 @@ void sgx_free_va_slot(struct sgx_va_page *va_page, unsigned int offset); bool sgx_va_page_full(struct sgx_va_page *va_page); int sgx_encl_may_map(struct sgx_encl *encl, unsigned long start, - unsigned long end, unsigned long vm_prot_bits); + unsigned long end, unsigned long vm_flags); #endif /* _X86_ENCL_H */