From patchwork Wed May 2 19:04:01 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 10376391 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 20D9A603B4 for ; Wed, 2 May 2018 19:59:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1163E28FBA for ; Wed, 2 May 2018 19:59:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 03A2528FBD; Wed, 2 May 2018 19:59:42 +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=-2.7 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED, SORTED_RECIPS autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id 27F5528FBA for ; Wed, 2 May 2018 19:59:40 +0000 (UTC) Received: (qmail 10229 invoked by uid 550); 2 May 2018 19:59:36 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Delivered-To: moderator for kernel-hardening@lists.openwall.com Received: (qmail 20003 invoked from network); 2 May 2018 19:05:56 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1525287944; bh=D31RMhV9hExUl3K9xtLm4QBIqQspE8eNwgCMatPAO7Q=; h=Subject:To:Cc:From:Date:From; b=EFJGW50VRMdNGJb6X2/lJguC+FE7mqvRR7EDMFRqH21GY9VhGzI13/Oxfafh/4uHL SUkh/gGWkrDK87de2OhaO3IwgcDcmEnXbcrH8a9FpKkwqlxcxmgC/HGFiv4PTQq9L5 fFaAHT44vyu6AhhXupGkHQ5QDEe5LCkKzfo7NLdk= Subject: Patch "kvm: x86: fix KVM_XEN_HVM_CONFIG ioctl" has been added to the 4.4-stable tree To: alexander.levin@microsoft.com, gregkh@linuxfoundation.org, keescook@chromium.org, kernel-hardening@lists.openwall.com, pbonzini@redhat.com, rkrcmar@redhat.com Cc: From: Date: Wed, 02 May 2018 12:04:01 -0700 Message-ID: <15252878411690@kroah.com> MIME-Version: 1.0 X-stable: commit X-Virus-Scanned: ClamAV using ClamSMTP This is a note to let you know that I've just added the patch titled kvm: x86: fix KVM_XEN_HVM_CONFIG ioctl to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kvm-x86-fix-kvm_xen_hvm_config-ioctl.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. From foo@baz Wed May 2 11:39:22 PDT 2018 From: Paolo Bonzini Date: Thu, 26 Oct 2017 15:45:47 +0200 Subject: kvm: x86: fix KVM_XEN_HVM_CONFIG ioctl From: Paolo Bonzini [ Upstream commit 51776043afa415435c7e4636204fbe4f7edc4501 ] This ioctl is obsolete (it was used by Xenner as far as I know) but still let's not break it gratuitously... Its handler is copying directly into struct kvm. Go through a bounce buffer instead, with the added benefit that we can actually do something useful with the flags argument---the previous code was exiting with -EINVAL but still doing the copy. This technically is a userspace ABI breakage, but since no one should be using the ioctl, it's a good occasion to see if someone actually complains. Cc: kernel-hardening@lists.openwall.com Cc: Kees Cook Cc: Radim Krčmář Signed-off-by: Paolo Bonzini Signed-off-by: Kees Cook Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/x86.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) Patches currently in stable-queue which might be from pbonzini@redhat.com are queue-4.4/kvm-x86-fix-kvm_xen_hvm_config-ioctl.patch --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3973,13 +3973,14 @@ long kvm_arch_vm_ioctl(struct file *filp mutex_unlock(&kvm->lock); break; case KVM_XEN_HVM_CONFIG: { + struct kvm_xen_hvm_config xhc; r = -EFAULT; - if (copy_from_user(&kvm->arch.xen_hvm_config, argp, - sizeof(struct kvm_xen_hvm_config))) + if (copy_from_user(&xhc, argp, sizeof(xhc))) goto out; r = -EINVAL; - if (kvm->arch.xen_hvm_config.flags) + if (xhc.flags) goto out; + memcpy(&kvm->arch.xen_hvm_config, &xhc, sizeof(xhc)); r = 0; break; }