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Ian Jackson
44ea68c6e6
This gives us a record of all the backends we have set up for a
domain, which is separate from the frontends in
/local/domain/$DOMID/device.
In particular:
1. A guest has write permission for the frontend path:
/local/domain/$DOMID/device/$KIND/$DEVID
which means that the guest can completely delete the frontend.
(They can't recreate it because they don't have write permission
on the containing directory.)
2. A guest has write permission for the backend path recorded in the
frontend, ie, it can write to
/local/domain/$DOMID/device/$KIND/$DEVID/backend
which means that the guest can break the association between
frontend and backend.
So we can't rely on iterating over the frontends to find all the
backends, or examining a frontend to discover how a device is
configured.
So, have libxl__device_generic_add record the frontend and backend
paths in /libxl/$DOMID/device, and have libxl__device_destroy remove
them again.
Create the containing directory /libxl/GUEST/device in
libxl__domain_make. The already existing xs_rm in devices_destroy_cb
will take care of removing it.
This is part of XSA-175.
Backport note: Backported over 7472ced, which fixes a bug in driver
domain teardown.
Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
xen-bugtool =========== The xen-bugtool command line application will collate the Xen dmesg output, details of the hardware configuration of your machine, information about the build of Xen that you are using, plus, if you allow it, various logs. The information collated can either be posted to a Xen Bugzilla bug (this bug must already exist in the system, and you must be a registered user there), or it can be saved as a .tar.bz2 for sending or archiving. The collated logs may contain private information, and if you are at all worried about that, you should not use this tool, or you should explicitly exclude those logs from the archive. xen-bugtool is wholly interactive, so simply run it, and answer the questions.