Date: Sun, 9 Mar 2014 01:26:40 +0000 From: Tom Evans <tevans.uk@googlemail.com> To: "freebsd-x11@freebsd.org" <freebsd-x11@freebsd.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Cc: Alexander Leidinger <Alexander@leidinger.net>, jamie@freebsd.org Subject: [PATCH] Xorg in a jail Message-ID: <CAFHbX1JUzM%2BN9Zx=eCQdejvz1jAWcXNHepB2=5ZRuunu1gAG6g@mail.gmail.com>
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--001a1133a8180070a404f42261fd Content-Type: text/plain; charset=UTF-8 I've been reinstalling my home server with 10-STABLE and wanted to compartmentalise all the disparate tasks it does - file storage, DNS, web servers and mplayer/xorg/media stuff in general - in to a separate jail for each task. For the most part, this was quite straightforward, apart from with xorg I found that it wasn't quite supported. I found Alexander's patch, and the work Jamie did in part integrating it, allowing kmem read, and reworked it for 10-STABLE. >From Jamie's emails it looked like he was working on a way of properly integrating these permissions in a more unified way, but I had a pressing need :) I've tested this on 10-STABLE r262457M, intel graphics (ivy bridge, WITH_NEW_XORG), and everything seems to work just fine. I'm going to try out radeonkms and nvidia tomorrow also. Also please note that whilst I want things jailed for separation and neatness concerns rather than security, it must be pointed out that letting one jail read and write kernel memory of the whole machine is not at all secure! Anyone with root in this xorg jail would be able to break free of the jail. I'm not sure I did the jail allow parameters right, but it works for me - I would appreciate someone more competent taking a look! Also, dev_io_access should probably be renamed or using it to control access to /dev/mem split out from it? Also, is the style right? vim: noet sw=8 ts=8 is what I was using. Cheers Tom PS: I haven't tested any input devices yet with this, let me know! Instructions: Apply patch, rebuild world and kernel, install and update jails/basejails Create /etc/devfs.rules to unhide the pertinent devices and restart devfs This is what I am using, it might be overkill... [devfsrules_unhide_xorg=8] add include $devfsrules_hide_all add include $devfsrules_unhide_basic add include $devfsrules_unhide_login add path agpgart unhide add path console unhide add path consolectl unhide add path dri unhide add path 'dri/*' unhide add path io unhide add path mem unhide add path pci unhide add path tty unhide add path ttyv0 unhide add path ttyv1 unhide add path ttyv8 unhide Set sysctls on jail host to allow jails to have permission granted to them to access (in particular) /dev/mem, /dev/io and /dev/dri/* security.jail.dev_io_access=1 security.jail.dev_dri_access=1 Configure your chosen jail to use these devfs rules and allow them to use the devices. I use ezjail, so for me this meant changing /usr/local/etc/ezjail/<name_of_jail> and setting these lines: export jail_xorg_foo_com_devfs_ruleset="8" export jail_xorg_foo_com_parameters="allow.dev_io_access=1 allow.dev_dri_access=1" Load any required kernel modules in the jail host - xorg in the jail will not be able to load them for you. Therefore, make sure to load i915kms, radeonkms or nvidia before hand. Install and use xorg in the jail as you would normally. --001a1133a8180070a404f42261fd Content-Type: text/plain; charset=US-ASCII; name="sys-jail-priv--xorg-in-jail.diff.txt" Content-Disposition: attachment; filename="sys-jail-priv--xorg-in-jail.diff.txt" Content-Transfer-Encoding: base64 X-Attachment-Id: f_hsjmunfq0 SW5kZXg6IHN5cy9kZXYvZHJtL2RybVAuaAo9PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBzeXMvZGV2L2RybS9kcm1Q LmgJKHJldmlzaW9uIDI2MjQ1NykKKysrIHN5cy9kZXYvZHJtL2RybVAuaAkod29ya2luZyBjb3B5 KQpAQCAtMjI4LDcgKzIyOCw3IEBACiAjZGVmaW5lIFBBR0VfQUxJR04oYWRkcikgcm91bmRfcGFn ZShhZGRyKQogLyogRFJNX1NVU0VSIHJldHVybnMgdHJ1ZSBpZiB0aGUgdXNlciBpcyBzdXBlcnVz ZXIgKi8KICNpZiBfX0ZyZWVCU0RfdmVyc2lvbiA+PSA3MDAwMDAKLSNkZWZpbmUgRFJNX1NVU0VS KHApCQkocHJpdl9jaGVjayhwLCBQUklWX0RSSVZFUikgPT0gMCkKKyNkZWZpbmUgRFJNX1NVU0VS KHApCQkocHJpdl9jaGVjayhwLCBQUklWX0RSSV9EUklWRVIpID09IDApCiAjZWxzZQogI2RlZmlu 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