linux/drivers/xen
Stefano Stabellini 36e8f60f08 xen: detect uninitialized xenbus in xenbus_init
If the xenstore page hasn't been allocated properly, reading the value
of the related hvm_param (HVM_PARAM_STORE_PFN) won't actually return
error. Instead, it will succeed and return zero. Instead of attempting
to xen_remap a bad guest physical address, detect this condition and
return early.

Note that although a guest physical address of zero for
HVM_PARAM_STORE_PFN is theoretically possible, it is not a good choice
and zero has never been validly used in that capacity.

Also recognize all bits set as an invalid value.

For 32-bit Linux, any pfn above ULONG_MAX would get truncated. Pfns
above ULONG_MAX should never be passed by the Xen tools to HVM guests
anyway, so check for this condition and return early.

Cc: stable@vger.kernel.org
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Link: https://lore.kernel.org/r/20211123210748.1910236-1-sstabellini@kernel.org
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2021-11-24 08:55:15 -06:00
..
events xen/events: Fix race in set_evtchn_to_irq 2021-08-12 10:49:54 -05:00
xen-pciback xen-pciback: allow compiling on other archs than x86 2021-11-02 08:03:43 -05:00
xenbus xen: detect uninitialized xenbus in xenbus_init 2021-11-24 08:55:15 -06:00
xenfs
acpi.c
arm-device.c
balloon.c xen/balloon: fix unused-variable warning 2021-11-08 10:40:17 -06:00
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
efi.c
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
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 dma-buf: move dma-buf symbols into the DMA_BUF module namespace 2021-10-25 14:53:08 +02:00
gntdev-dmabuf.h
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/privcmd: make option visible in Kconfig 2021-11-16 16:13:31 -06:00
Makefile xen-pciback: allow compiling on other archs than x86 2021-11-02 08:03:43 -05:00
manage.c xen/manage: Fix fall-through warnings for Clang 2020-12-16 07:58:44 +01:00
mcelog.c
mem-reservation.c x86/xen: remove 32-bit pv leftovers 2021-11-02 08:03:43 -05:00
pci.c xen-pciback: allow compiling on other archs than x86 2021-11-02 08:03:43 -05:00
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
privcmd.c xen/privcmd: drop "pages" parameter from xen_remap_pfn() 2021-10-05 08:20:27 +02:00
privcmd.h
pvcalls-back.c xen/pvcalls-back: Remove redundant 'flush_workqueue()' calls 2021-11-02 07:45:44 -05:00
pvcalls-front.c xen: flag pvcalls-front to be not essential for system boot 2021-11-23 13:42:20 -06:00
pvcalls-front.h
swiotlb-xen.c Merge branch 'akpm' (patches from Andrew) 2021-11-06 14:08:17 -07:00
sys-hypervisor.c
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
xen-acpi-processor.c xen: Fix implicit type conversion 2021-11-02 07:45:44 -05:00
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