CVE-2023-41051

In a typical Virtual Machine Monitor (VMM) there are several components,
such as boot loader, virtual device drivers, virtio backend drivers and
vhost drivers, that need to access the VM physical memory. The vm-memory
rust crate provides a set of traits to decouple VM memory consumers from VM
memory providers. An issue was discovered in the default implementations of
the VolatileMemory::{get_atomic_ref, aligned_as_ref, aligned_as_mut, get_ref, get_array_ref} trait functions, which allows out-of-bounds memory
access if the VolatileMemory::get_slice function returns a
VolatileSlice whose length is less than the function’s count argument.
No implementations of get_slice provided in vm_memory are affected.
Users of custom VolatileMemory implementations may be impacted if the
custom implementation does not adhere to get_slice’s documentation. The
issue started in version 0.1.0 but was fixed in version 0.12.2 by inserting
a check that verifies that the VolatileSlice returned by get_slice is
of the correct length. Users are advised to upgrade. There are no known
workarounds for this issue.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1051101&gt;