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Mon, 11 Oct 2021 12:14:32 +0000 (UTC) Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-597-KD96ISU4NFSGPy0U9Lh6UQ-1; Mon, 11 Oct 2021 08:14:29 -0400 Received: from dggemv703-chm.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4HSd072dWrzYl20 for ; Mon, 11 Oct 2021 20:09:59 +0800 (CST) Received: from dggema765-chm.china.huawei.com (10.1.198.207) by dggemv703-chm.china.huawei.com (10.3.19.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2308.8; Mon, 11 Oct 2021 20:14:26 +0800 Received: from localhost.localdomain (10.175.101.6) by dggema765-chm.china.huawei.com (10.1.198.207) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.8; Mon, 11 Oct 2021 20:14:25 +0800 X-MC-Unique: 9MCrj3KyNUWd4LVKVJVObQ-1 X-MC-Unique: KD96ISU4NFSGPy0U9Lh6UQ-1 From: Peng Liang To: Subject: [PATCH 1/2] qemu: Move pid file of pr-helper to stateDir Date: Mon, 11 Oct 2021 20:11:35 +0800 Message-ID: <20211011121136.249689-2-liangpeng10@huawei.com> In-Reply-To: <20211011121136.249689-1-liangpeng10@huawei.com> References: <20211011121136.249689-1-liangpeng10@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggema765-chm.china.huawei.com (10.1.198.207) X-CFilter-Loop: Reflected X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 X-MIME-Autoconverted: from quoted-printable to 8bit by lists01.pubmisc.prod.ext.phx2.redhat.com id 19BCEWu9021486 X-loop: libvir-list@redhat.com Cc: yubihong@huawei.com, liangpeng10@huawei.com, xiexiangyou@huawei.com X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: libvir-list-bounces@redhat.com Errors-To: libvir-list-bounces@redhat.com X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=libvir-list-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-ZM-MESSAGEID: 1633954483445100001 Content-Type: text/plain; charset="utf-8" Libvirt will put the pid file of pr-helper to per-domain directory. However, the ownership of the per-domain directory is the user to run the QEMU process and the user has the write permission of the directory. If VM escape occurs, the attacker can 1. write arbitrary content to the pid file (if running QEMU using root), then the attacker can kill any process by writing appropriate pid to the pid file; 2. spoof the pid file (if running QEMU using a regular user), then the pr-helper process will never be cleared even if the VM is destroyed. So, move the pid file of pr-helper from per-domain directory to stateDir just like the pid file of the domain. Signed-off-by: Peng Liang --- src/qemu/qemu_process.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index 1d0165af6daa..583f3ec76c7b 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -2859,9 +2859,11 @@ static char * qemuProcessBuildPRHelperPidfilePath(virDomainObj *vm) { qemuDomainObjPrivate *priv =3D vm->privateData; - const char *prdAlias =3D qemuDomainGetManagedPRAlias(); + g_autofree char *domname =3D virDomainDefGetShortName(vm->def); + g_autofree char *prdName =3D g_strdup_printf("%s-%s", domname, qemuDom= ainGetManagedPRAlias()); + g_autoptr(virQEMUDriverConfig) cfg =3D virQEMUDriverGetConfig(priv->dr= iver); =20 - return virPidFileBuildPath(priv->libDir, prdAlias); + return virPidFileBuildPath(cfg->stateDir, prdName); } =20 =20 --=20 2.31.1