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linux/drivers/xen
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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>
History 2021-12-22 09:32:52 +01:00
..
events xen/console: harden hvc_xen against event channel storms 2021-12-22 09:32:52 +01:00
xen-pciback xen-pciback: Fix return in pm_ctrl_init() 2021-11-18 19:17:05 +01:00
xenbus xen: detect uninitialized xenbus in xenbus_init 2021-12-01 09:04:42 +01:00
xenfs Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
acpi.c xen: rename dom0_op to platform_op 2015-12-21 14:40:55 +00:00
arm-device.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
balloon.c xen/balloon: add late_initcall_sync() for initial ballooning done 2021-11-18 19:16:04 +01:00
biomerge.c block: pass page to xen_biovec_phys_mergeable 2019-04-01 12:11:13 -06:00
cpu_hotplug.c xen/cpuhotplug: Fix initial CPU offlining for PV(H) guests 2020-05-21 13:01:45 -05:00
dbgp.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
efi.c xen/efi: have a common runtime setup function 2019-10-02 10:31:07 -04:00
evtchn.c xen/evtchn: use READ/WRITE_ONCE() for accessing ring indices 2021-02-23 10:07:52 -06:00
features.c xen: check required Xen features 2021-08-30 11:57:45 +02:00
gntalloc.c mm: treewide: remove GFP_TEMPORARY allocation flag 2017-09-13 18:53:16 -07:00
gntdev-common.h xen: Use evtchn_type_t as a type for event channels 2020-04-07 12:12:54 +02:00
gntdev-dmabuf.c xen: gntdev: fix common struct sg_table related issues 2020-09-10 08:18:35 +02:00
gntdev-dmabuf.h xen/gntdev: Do not destroy context while dma-bufs are in use 2019-02-18 06:50:03 +01:00
gntdev.c Xen/gntdev: don't ignore kernel unmapping error 2021-09-20 16:57:08 +02:00
grant-table.c xen: don't use page->lru for ZONE_DEVICE memory 2020-12-09 10:31:41 +01:00
Kconfig xen/x86: allow PVH Dom0 without XEN_PV=y 2021-10-05 08:35:56 +02:00
Makefile xen: Remove support for PV ACPI cpu/memory hotplug 2021-04-23 09:31:50 +02:00
manage.c xen/manage: Fix fall-through warnings for Clang 2020-12-16 07:58:44 +01:00
mcelog.c xen/mcelog: add PPIN to record when available 2019-11-14 10:01:57 +01:00
mem-reservation.c xen/balloon: add runtime control for scrubbing ballooned out pages 2018-09-14 08:51:10 -04:00
pci.c xen/pci: reserve MCFG areas earlier 2019-09-12 15:02:55 -04:00
pcpu.c xen: Use DEVICE_ATTR_*() macro 2021-07-05 09:23:31 +02:00
platform-pci.c xen: Set platform PCI device INTX affinity to CPU0 2021-01-13 16:12:03 +01:00
privcmd-buf.c xen/privcmd-buf.c: convert to use vm_map_pages_zero() 2019-05-14 09:47:50 -07:00
privcmd.c xen/privcmd: drop "pages" parameter from xen_remap_pfn() 2021-10-05 08:20:27 +02:00
privcmd.h xen: add new hypercall buffer mapping device 2018-06-22 08:26:42 +02:00
pvcalls-back.c xen/events: link interdomain events to associated xenbus device 2021-02-11 14:47:00 -08:00
pvcalls-front.c xen: remove redundant initialization of variable ret 2020-10-04 18:41:33 -05:00
pvcalls-front.h xen: fix poll misannotation 2018-02-01 10:07:32 -05:00
swiotlb-xen.c xen: branch for v5.15-rc3 2021-09-25 15:37:31 -07:00
sys-hypervisor.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
time.c x86/paravirt: Switch time pvops functions to use static_call() 2021-03-11 16:17:52 +01:00
unpopulated-alloc.c xen/unpopulated-alloc: fix error return code in fill_list() 2021-05-10 09:42:25 +02:00
xen-acpi-pad.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 2019-06-05 17:36:37 +02:00
xen-acpi-processor.c xen: Replace lkml.org links with lore 2021-02-23 10:08:07 -06:00
xen-balloon.c xen: Use DEVICE_ATTR_*() macro 2021-07-05 09:23:31 +02:00
xen-front-pgdir-shbuf.c xen-front-pgdir-shbuf: don't record wrong grant handle upon error 2021-02-23 12:35:43 -06:00
xen-scsiback.c isystem: trim/fixup stdarg.h and other headers 2021-08-19 09:02:55 +09:00
xlate_mmu.c xen: add helpers to allocate unpopulated memory 2020-09-04 10:00:01 +02:00