Juergen Gross 153d1ea327 xen/console: harden hvc_xen against event channel storms ... commit fe415186b4 upstream. The Xen console driver is still vulnerable for an attack via excessive number of events sent by the backend. Fix that by using a lateeoi event channel. For the normal domU initial console this requires the introduction of bind_evtchn_to_irq_lateeoi() as there is no xenbus device available at the time the event channel is bound to the irq. As the decision whether an interrupt was spurious or not requires to test for bytes having been read from the backend, move sending the event into the if statement, as sending an event without having found any bytes to be read is making no sense at all. This is part of XSA-391 Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-12-22 09:32:52 +01:00
..
arm	xen/arm: move xen_swiotlb_detect to arm/swiotlb-xen.h	2021-05-14 15:52:05 +02:00
interface	xen: sync include/xen/interface/io/ring.h with Xen's newest version	2021-07-05 09:49:45 +02:00
acpi.h	xen: Remove support for PV ACPI cpu/memory hotplug	2021-04-23 09:31:50 +02:00
balloon.h	xen/balloon: add header guard	2020-09-04 09:59:53 +02:00
events.h	xen/console: harden hvc_xen against event channel storms	2021-12-22 09:32:52 +01:00
features.h	…
grant_table.h	Xen/gnttab: introduce common INVALID_GRANT_{HANDLE,REF}	2021-03-10 16:39:29 -06:00
hvc-console.h	…
hvm.h	xen: Move xen_setup_callback_vector() definition to include/xen/hvm.h	2020-06-11 15:15:19 +02:00
mem-reservation.h	…
page.h	swiotlb-xen: remove XEN_PFN_PHYS	2020-08-04 07:50:43 +02:00
platform_pci.h	…
swiotlb-xen.h	Merge branch 'stable/for-linus-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb	2021-05-04 10:58:49 -07:00
xen-front-pgdir-shbuf.h	…
xen-ops.h	xen/privcmd: drop "pages" parameter from xen_remap_pfn()	2021-10-05 08:20:27 +02:00
xen.h	xen: add helpers to allocate unpopulated memory	2020-09-04 10:00:01 +02:00
xenbus.h	Xen/gnttab: introduce common INVALID_GRANT_{HANDLE,REF}	2021-03-10 16:39:29 -06:00
xenbus_dev.h	…