From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754011Ab2GQOkm (ORCPT ); Tue, 17 Jul 2012 10:40:42 -0400 Received: from e28smtp05.in.ibm.com ([122.248.162.5]:40589 "EHLO e28smtp05.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752258Ab2GQOkl (ORCPT ); Tue, 17 Jul 2012 10:40:41 -0400 Message-ID: <50057962.1020603@linux.vnet.ibm.com> Date: Tue, 17 Jul 2012 22:40:34 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1 MIME-Version: 1.0 To: Xiao Guangrong CC: Avi Kivity , Marcelo Tosatti , LKML , KVM Subject: [PATCH 01/10] KVM: fix missing check for memslot flags References: <5005791B.8040807@linux.vnet.ibm.com> In-Reply-To: <5005791B.8040807@linux.vnet.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit x-cbid: 12071714-8256-0000-0000-00000359A1F4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Check flags when memslot is registered from userspace as Avi's suggestion Signed-off-by: Xiao Guangrong --- virt/kvm/kvm_main.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 78cf42f..7cb29bb 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -689,6 +689,14 @@ void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new) slots->generation++; } +static int check_memory_region_flags(struct kvm_userspace_memory_region *mem) +{ + if (mem->flags & ~KVM_MEM_LOG_DIRTY_PAGES) + return -EINVAL; + + return 0; +} + /* * Allocate some memory and give it an address in the guest physical address * space. @@ -709,6 +717,10 @@ int __kvm_set_memory_region(struct kvm *kvm, struct kvm_memory_slot old, new; struct kvm_memslots *slots, *old_memslots; + r = check_memory_region_flags(mem); + if (r) + goto out; + r = -EINVAL; /* General sanity checks */ if (mem->memory_size & (PAGE_SIZE - 1)) -- 1.7.7.6