SeongJae Park 9996bd4947 xenbus/xenbus_backend: Disallow pending watch messages ... 'xenbus_backend' watches 'state' of devices, which is writable by guests. Hence, if guests intensively updates it, dom0 will have lots of pending events that exhausting memory of dom0. In other words, guests can trigger dom0 memory pressure. This is known as XSA-349. However, the watch callback of it, 'frontend_changed()', reads only 'state', so doesn't need to have the pending events. To avoid the problem, this commit disallows pending watch messages for 'xenbus_backend' using the 'will_handle()' watch callback. This is part of XSA-349 Cc: stable@vger.kernel.org Signed-off-by: SeongJae Park <sjpark@amazon.de> Reported-by: Michael Kurth <mku@amazon.de> Reported-by: Pawel Wieczorkiewicz <wipawel@amazon.de> Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com>		2020-12-14 10:08:40 +01:00
..
events	xen/events: unmask a fifo event channel only if it was masked	2020-10-23 05:41:25 -05:00
xen-pciback	xen/xenbus: Add 'will_handle' callback support in xenbus_watch_path()	2020-12-14 10:04:18 +01:00
xenbus	xenbus/xenbus_backend: Disallow pending watch messages	2020-12-14 10:08:40 +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
arm-device.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201	2019-05-30 11:29:52 -07:00
balloon.c	xen/balloon: try to merge system ram resources	2020-10-16 11:11:18 -07:00
biomerge.c
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/events: switch user event channels to lateeoi model	2020-10-20 10:22:11 +02:00
features.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
gntalloc.c
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
gntdev.c	xen/gntdev.c: Convert get_user_pages*() to pin_user_pages*()	2020-10-04 18:41:33 -05:00
grant-table.c	xen: don't use page->lru for ZONE_DEVICE memory	2020-12-09 10:31:41 +01:00
Kconfig	xen: branch for v5.9-rc4	2020-09-06 09:59:27 -07:00
Makefile	xen: branch for v5.9-rc4	2020-09-06 09:59:27 -07:00
manage.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
mcelog.c	xen/mcelog: add PPIN to record when available	2019-11-14 10:01:57 +01:00
mem-reservation.c
pci.c	xen/pci: reserve MCFG areas earlier	2019-09-12 15:02:55 -04:00
pcpu.c
platform-pci.c	xen-platform: Constify dev_pm_ops	2020-05-21 13:00:39 -05:00
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: branch for v5.9-rc4	2020-09-06 09:59:27 -07:00
privcmd.h
pvcalls-back.c	xen/pvcallsback: use lateeoi irq binding	2020-10-20 10:22:07 +02:00
pvcalls-front.c	xen: remove redundant initialization of variable ret	2020-10-04 18:41:33 -05:00
pvcalls-front.h
swiotlb-xen.c	swiotlb: remove the tbl_dma_addr argument to swiotlb_tbl_map_single	2020-11-02 10:10:39 -05:00
sys-hypervisor.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
time.c	READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses	2020-04-16 12:28:07 +01:00
unpopulated-alloc.c	xen: don't use page->lru for ZONE_DEVICE memory	2020-12-09 10:31:41 +01:00
xen-acpi-cpuhotplug.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 12	2019-05-21 11:28:45 +02:00
xen-acpi-memhotplug.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
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	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288	2019-06-05 17:36:37 +02:00
xen-balloon.c	xen/balloon: Support xend-based toolstack take two	2020-01-22 08:58:16 -06:00
xen-front-pgdir-shbuf.c
xen-scsiback.c	xen: add helpers for caching grant mapping pages	2020-12-09 10:31:37 +01:00
xen-stub.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 12	2019-05-21 11:28:45 +02:00
xlate_mmu.c	xen: add helpers to allocate unpopulated memory	2020-09-04 10:00:01 +02:00