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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> |
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.. | ||
events | ||
xen-pciback | ||
xenbus | ||
xenfs | ||
acpi.c | ||
arm-device.c | ||
balloon.c | ||
biomerge.c | ||
cpu_hotplug.c | ||
dbgp.c | ||
efi.c | ||
evtchn.c | ||
features.c | ||
gntalloc.c | ||
gntdev-common.h | ||
gntdev-dmabuf.c | ||
gntdev-dmabuf.h | ||
gntdev.c | ||
grant-table.c | ||
Kconfig | ||
Makefile | ||
manage.c | ||
mcelog.c | ||
mem-reservation.c | ||
pci.c | ||
pcpu.c | ||
platform-pci.c | ||
privcmd-buf.c | ||
privcmd.c | ||
privcmd.h | ||
pvcalls-back.c | ||
pvcalls-front.c | ||
pvcalls-front.h | ||
swiotlb-xen.c | ||
sys-hypervisor.c | ||
time.c | ||
unpopulated-alloc.c | ||
xen-acpi-pad.c | ||
xen-acpi-processor.c | ||
xen-balloon.c | ||
xen-front-pgdir-shbuf.c | ||
xen-scsiback.c | ||
xlate_mmu.c |