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=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=ham 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 C2245C433E6 for ; Sun, 17 Jan 2021 18:47:04 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D181C224B8 for ; Sun, 17 Jan 2021 18:47:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D181C224B8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bugs.launchpad.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:57824 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l1D4o-0007nO-K1 for qemu-devel@archiver.kernel.org; Sun, 17 Jan 2021 13:47:02 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:50984) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l1D3X-0007Bo-9I for qemu-devel@nongnu.org; Sun, 17 Jan 2021 13:45:43 -0500 Received: from indium.canonical.com ([91.189.90.7]:43312) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1l1D3V-0008Vo-40 for qemu-devel@nongnu.org; Sun, 17 Jan 2021 13:45:43 -0500 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1l1D3S-0001LD-Lb for ; Sun, 17 Jan 2021 18:45:38 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id A05252E8042 for ; Sun, 17 Jan 2021 18:45:38 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Sun, 17 Jan 2021 18:37:00 -0000 From: Mingye Wang <1912107@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=New; importance=Undecided; assignee=None; X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: artoria2e5 X-Launchpad-Bug-Reporter: Mingye Wang (artoria2e5) X-Launchpad-Bug-Modifier: Mingye Wang (artoria2e5) Message-Id: <161090862069.30717.14713485848942415507.malonedeb@chaenomeles.canonical.com> Subject: [Bug 1912107] [NEW] Option to constrain linux-user exec() to emulated CPU only X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="511b4a3b6512aa3d421c5f7d74f3527e78bff26e"; Instance="production" X-Launchpad-Hash: be40cfcf53dc15885dcba041108ac82e1d7cc28d Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-Spam_score_int: -66 X-Spam_score: -6.7 X-Spam_bar: ------ X-Spam_report: (-6.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1912107 <1912107@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Public bug reported: When trying to reproduce a bug someone reported on an actual AMD K10[1], = =E2=80=8BI tried to directly throw `qemu_x86-64 -cpu = =E2=80=8Bphenom path/to/wrongly-labelled-instruction-set/gcc 1.c` at the pr= oblem, but failed to get an "illegal instruction" as expected. A quick inve= stigation reveals that the error is actually caused by one of gcc's child p= rocessess, and that the said process is being ran directly on the host. A s= imilar problem happens with trying to call stuff with /usr/bin/env. =E2=80=8B[1]: https://github.com/Homebrew/brew/issues/1034 Since both the host and the guest are x86_64, I deemed binfmt inapplicable to my case. I believe that QEMU should offer a way to modify exec() and other spawning syscalls so that execution remains on an emulated CPU in such a case. Call it an extra layer of binfmt, if you must. ** Affects: qemu Importance: Undecided Status: New -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1912107 Title: Option to constrain linux-user exec() to emulated CPU only Status in QEMU: New Bug description: When trying to reproduce a bug someone reported on an actual AMD K10[1], = =E2=80=8BI tried to directly throw `qemu_x86-64 -cpu = =E2=80=8Bphenom path/to/wrongly-labelled-instruction-set/gcc 1.c` at the = problem, but failed to get an "illegal instruction" as expected. A quick in= vestigation reveals that the error is actually caused by one of gcc's child= processess, and that the said process is being ran directly on the host. A= similar problem happens with trying to call stuff with /usr/bin/env. =E2=80=8B[1]: https://github.com/Homebrew/brew/issues/1034 Since both the host and the guest are x86_64, I deemed binfmt inapplicable to my case. I believe that QEMU should offer a way to modify exec() and other spawning syscalls so that execution remains on an emulated CPU in such a case. Call it an extra layer of binfmt, if you must. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1912107/+subscriptions