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From: Jim Fehlig <jfehlig@suse.com>
To: xen-devel@lists.xen.org
Cc: Jim Fehlig <jfehlig@suse.com>
Subject: [PATCH] tools: Restrict configuration of qemu processes
Date: Mon, 14 Mar 2016 19:08:49 -0600	[thread overview]
Message-ID: <1458004129-29004-1-git-send-email-jfehlig@suse.com> (raw)

Commit 6ef823fd added '-nodefaults' to the qemu args created by
libxl, which is a good step in restricting qemu's default
configuration. This change takes another step by adding
-no-user-config, which ignores any user-provided config files in
sysconfdir. Together, -nodefaults and -no-user-config allow Xen
to avoid unkown and uncontrolled qemu configuration.

Both options are also added to the qemu invocation in the
xen-qemu-dom0-disk-backend systemd service file.

Signed-off-by: Jim Fehlig <jfehlig@suse.com>
---
 tools/hotplug/Linux/systemd/xen-qemu-dom0-disk-backend.service.in | 1 +
 tools/libxl/libxl_dm.c                                            | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/tools/hotplug/Linux/systemd/xen-qemu-dom0-disk-backend.service.in b/tools/hotplug/Linux/systemd/xen-qemu-dom0-disk-backend.service.in
index acf61a8..f56775b 100644
--- a/tools/hotplug/Linux/systemd/xen-qemu-dom0-disk-backend.service.in
+++ b/tools/hotplug/Linux/systemd/xen-qemu-dom0-disk-backend.service.in
@@ -14,6 +14,7 @@ ExecStartPre=/bin/mkdir -p @XEN_RUN_DIR@
 ExecStart=@qemu_xen_systemd@ -xen-domid 0 \
 	-xen-attach -name dom0 -nographic -M xenpv -daemonize \
 	-monitor /dev/null -serial /dev/null -parallel /dev/null \
+	-nodefaults -no-user-config \
 	-pidfile @XEN_RUN_DIR@/qemu-dom0.pid
 
 [Install]
diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index 4aca38e..cfda24c 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -828,6 +828,12 @@ static int libxl__build_device_model_args_new(libxl__gc *gc,
      */
     flexarray_append(dm_args, "-nodefaults");
 
+    /*
+     * Do not use any of the user-provided config files in sysconfdir,
+     * avoiding unkown and uncontrolled configuration.
+     */
+    flexarray_append(dm_args, "-no-user-config");
+
     if (b_info->type == LIBXL_DOMAIN_TYPE_PV) {
         flexarray_append(dm_args, "-xen-attach");
     }
-- 
2.1.4


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             reply	other threads:[~2016-03-15  1:08 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-15  1:08 Jim Fehlig [this message]
2016-03-15  1:14 ` Jim Fehlig
2016-03-15 12:28   ` Wei Liu
2016-03-22 20:12     ` Jim Fehlig
2016-03-24 13:53 ` Ian Jackson
2016-05-09 16:35   ` Ian Jackson
2016-05-09 22:37     ` Jim Fehlig

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