Sean Christopherson 6a44f200f1 KVM: Disallow user memslot with size that exceeds "unsigned long" ... commit 6b285a5587506bae084cf9a3ed5aa491d623b91b upstream. Reject userspace memslots whose size exceeds the storage capacity of an "unsigned long". KVM's uAPI takes the size as u64 to support large slots on 64-bit hosts, but does not account for the size being truncated on 32-bit hosts in various flows. The access_ok() check on the userspace virtual address in particular casts the size to "unsigned long" and will check the wrong number of bytes. KVM doesn't actually support slots whose size doesn't fit in an "unsigned long", e.g. KVM's internal kvm_memory_slot.npages is an "unsigned long", not a "u64", and misc arch specific code follows that behavior. Fixes: fa3d315a4c ("KVM: Validate userspace_addr of memslot when registered") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com> Message-Id: <20211104002531.1176691-3-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-12-08 09:03:21 +01:00
..
async_pf.c	mm/gup: remove task_struct pointer for all gup code	2020-08-12 10:58:04 -07:00
async_pf.h
coalesced_mmio.c	KVM: mmio: Fix use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio	2021-07-20 16:05:35 +02:00
coalesced_mmio.h
eventfd.c	kvm/eventfd: move wildcard calculation outside loop	2020-09-28 07:57:08 -04:00
irqchip.c
Kconfig	entry: Provide infrastructure for work before transitioning to guest mode	2020-07-24 15:03:42 +02:00
kvm_main.c	KVM: Disallow user memslot with size that exceeds "unsigned long"	2021-12-08 09:03:21 +01:00
vfio.c
vfio.h