From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F16EC4CEC5 for ; Fri, 13 Sep 2019 15:01:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 606AE2089F for ; Fri, 13 Sep 2019 15:01:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390368AbfIMPBa (ORCPT ); Fri, 13 Sep 2019 11:01:30 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55632 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388170AbfIMPBa (ORCPT ); Fri, 13 Sep 2019 11:01:30 -0400 Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E842A69086 for ; Fri, 13 Sep 2019 15:01:29 +0000 (UTC) Received: by mail-wr1-f72.google.com with SMTP id m9so5579158wrs.13 for ; Fri, 13 Sep 2019 08:01:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:openpgp:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=zuzwEhDdM8nFD/eqeUMdkZbahAvWuck1YuH/cdNiv9o=; b=PjxXhMbxa+xSYoXxLItV6eH6SJvgk/3UwuGViptFDFGpHPLloerz7KikrWse4dg4BB WFko1n0aCobLTo85rLUXxZGU8Dexc4HDdiMe9kpH0JFRIBvvNsfAIe3fPw68Oh0kJ47j LY/aaHfHJoVS5FbbV2BgW+tAt8lzgjlDFtdyhSficwa9k97bwgPVfDX1CzY436a0Y9ba 6qaoL2QuX0bzq+RORTdXHu0hQpkAwFkog8J5PnjZrxjMQZ400t6w2BG3vFPq6wR0usOg pjldtopUR+3wSThHKYKAGm1WEcQfZdsEkQe0hq0icJ+9MPIajYv4DTPaMRSTnmelPcBT QtJA== X-Gm-Message-State: APjAAAURRaWIfkbDx/fvyLzSLKPZDrS00IU+jyF1dWcbblIf+pmey72B +OiBysWCVtoSMq0kQ5uZptRQO0FsD5u3xbwDhoWGLyfpaNPZcyAw1iJ6P07kY2vztcTm5bvGeM5 DODnLMIoTYw0m X-Received: by 2002:a1c:c013:: with SMTP id q19mr3447798wmf.87.1568386884926; Fri, 13 Sep 2019 08:01:24 -0700 (PDT) X-Google-Smtp-Source: APXvYqxVmkhicWbX9sM2V6LPnr+xLUUrZU9HvAJMzAOfyJJVoRtNarvooFR4sjG8yibYs2ccdb68wg== X-Received: by 2002:a1c:c013:: with SMTP id q19mr3447762wmf.87.1568386884662; Fri, 13 Sep 2019 08:01:24 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:c5d2:4bb2:a923:3a9a? ([2001:b07:6468:f312:c5d2:4bb2:a923:3a9a]) by smtp.gmail.com with ESMTPSA id y15sm1949532wmj.32.2019.09.13.08.01.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 13 Sep 2019 08:01:24 -0700 (PDT) Subject: Re: KASAN: slab-out-of-bounds Read in handle_vmptrld To: Greg Kroah-Hartman Cc: Vitaly Kuznetsov , kvm@vger.kernel.org, bp@alien8.de, carlo@caione.org, catalin.marinas@arm.com, devicetree@vger.kernel.org, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, khilman@baylibre.com, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, mark.rutland@arm.com, mingo@redhat.com, narmstrong@baylibre.com, rkrcmar@redhat.com, robh+dt@kernel.org, sean.j.christopherson@intel.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, wanpengli@tencent.com, will.deacon@arm.com, x86@kernel.org, syzbot , Dmitry Vyukov , USB list References: <000000000000a9d4f705924cff7a@google.com> <87lfutei1j.fsf@vitty.brq.redhat.com> <5218e70e-8a80-7c5f-277b-01d9ab70692a@redhat.com> <20190913044614.GA120223@kroah.com> <20190913130226.GB403359@kroah.com> From: Paolo Bonzini Openpgp: preference=signencrypt Message-ID: <6a0ec3a2-2a52-f67a-6140-e0a60874538a@redhat.com> Date: Fri, 13 Sep 2019 17:01:22 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190913130226.GB403359@kroah.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 13/09/19 15:02, Greg Kroah-Hartman wrote: > Look at linux-next, we "should" have fixed up hcd_buffer_alloc() now to > not need this type of thing. If we got it wrong, please let us know and > then yes, a fix like this would be most appreciated :) I still see /* some USB hosts just use PIO */ if (!hcd_uses_dma(hcd)) { *dma = ~(dma_addr_t) 0; return kmalloc(size, mem_flags); } in linux-next's hcd_buffer_alloc and also in usb.git's usb-next branch. I also see the same if (remap_pfn_range(vma, vma->vm_start, virt_to_phys(usbm->mem) >> PAGE_SHIFT, size, vma->vm_page_prot) < 0) { ... } in usbdev_mmap. Of course it's possible that I'm looking at the wrong branch, or just being dense. Paolo