From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail02.groups.io (mail02.groups.io [66.175.222.108]) by spool.mail.gandi.net (Postfix) with ESMTPS id 0985E941BE2 for ; Tue, 13 Feb 2024 15:28:27 +0000 (UTC) DKIM-Signature: a=rsa-sha256; bh=QfUdZXEEz5czyKHflq580TRWeu+/rPGP1r2jCXTCGEs=; c=relaxed/simple; d=groups.io; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version:In-Reply-To:Precedence:List-Subscribe:List-Help:Sender:List-Id:Mailing-List:Delivered-To:Reply-To:List-Unsubscribe-Post:List-Unsubscribe:Content-Type:Content-Disposition; s=20140610; t=1707838106; v=1; b=lt+D0W3NplfOHurUIayLV95FpZ/BPN5we0B21Z1UlTCu3AqS8B8kWedZ8Lzh630shdovZUsn 5vYlyOpXC1hc6kjXnWlJRUFvC43YRX1YH/YBlTZOOa1+CqJh/Ph8nkZBqhxhCCUDQEV64hyQ371 E3PP6y5/lPLDfMLvVPyv3o4Y= X-Received: by 127.0.0.2 with SMTP id e8krYY7687511xJkw1duxGqH; Tue, 13 Feb 2024 07:28:26 -0800 X-Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by mx.groups.io with SMTP id smtpd.web10.14123.1707838105932358793 for ; Tue, 13 Feb 2024 07:28:26 -0800 X-Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-417-GxrhCBjQP92lxy2Zmld2ww-1; Tue, 13 Feb 2024 10:28:19 -0500 X-MC-Unique: GxrhCBjQP92lxy2Zmld2ww-1 X-Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 16391381D4A8; Tue, 13 Feb 2024 15:28:09 +0000 (UTC) X-Received: from sirius.home.kraxel.org (unknown [10.39.193.192]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DCED62166B31; Tue, 13 Feb 2024 15:28:08 +0000 (UTC) X-Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id D19A11800987; Tue, 13 Feb 2024 16:28:07 +0100 (CET) Date: Tue, 13 Feb 2024 16:28:07 +0100 From: "Gerd Hoffmann" To: Ard Biesheuvel Cc: devel@edk2.groups.io, pedro.falcato@gmail.com, Laszlo Ersek , Oliver Steffen , Ard Biesheuvel , Jiewen Yao , dun.tan@intel.com Subject: Re: [edk2-devel] [PATCH 1/1] OvmfPkg/QemuVideoDxe: purge VbeShim Message-ID: References: <20240213085925.687848-1-kraxel@redhat.com> <64005185-3cfd-de56-f086-da301aff13ba@redhat.com> MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Precedence: Bulk List-Subscribe: List-Help: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,kraxel@redhat.com List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: X-Gm-Message-State: 85RCc9pK9oV9k0HKUl33OEGXx7686176AA= Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-GND-Status: LEGIT Authentication-Results: spool.mail.gandi.net; dkim=pass header.d=groups.io header.s=20140610 header.b=lt+D0W3N; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=redhat.com (policy=none); spf=pass (spool.mail.gandi.net: domain of bounce@groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce@groups.io Hi, > > > New theory: This is a NULL pointer dereference corrupting the zero page. > > > > Tangentially related: Maybe it's time to unmap the NULL page? :) Suggestion: read mails to the end. Had the same idea + question ;) > That would break many 3rd party GPU and network drivers. For virtual machine firmware it might be acceptable to just ignore that, or at least default to an unmapped zero page and offer an qemu fw-cfg override in case someone needs that when pci-assigning nic or gpu to a VM. take care, Gerd -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#115387): https://edk2.groups.io/g/devel/message/115387 Mute This Topic: https://groups.io/mt/104329097/7686176 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io] -=-=-=-=-=-=-=-=-=-=-=-