Not all types are safe to read from guest memory. Any type with a
reference or pointer will be initialized to random bits that don't refer
to a valid address. This can cause dangling pointer and general
unsafe behavior.
To fix this, limit types that can be read with read_obj to those that
implement the unsafe trait `DataInit`. Provide implementations of
`DataInit` for intrinsic types that are obviously safe to initialize
with random data.
Implement the needed traits for bootparam types as they are read from
the kernel image directly.
Change-Id: I1040f5bc1b2fc4c58c87d8a2ce3f618edcf6f9b1
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/540750
Reviewed-by: Zach Reizner <zachr@chromium.org>
This will be used to create temporary directories that are lifetime
managed for running jails.
Change-Id: I35dfeae76a211c820db090b65baf72277d9e2d8a
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/520706
Reviewed-by: Zach Reizner <zachr@chromium.org>
Add a module for accessing guest memory.
This module will replace all the slices that are used to access it
currently as those slices aren't valid because the memory is volatile
and a volatile slice doesn't exist in rust.
Modify the existing users so they no longer depend on the deprecated slice
access.
Change-Id: Ic0e86dacf66f68bd88ed9cc197cb14e45ada891d
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/509919
These utilities are used for reading structs from u8 slices.
Often the kernel returns pointers to void pointers that represent a struct.
This helps convert back to the struct.
Change-Id: I6e59fb772f3ba75f006c9370412267ff565dfe4c
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/497768
Reviewed-by: Zach Reizner <zachr@chromium.org>
In KVM, eventfd's are essential for sending and receiving signals to the
VM. This CL adds a safe wrapper around their usage.
TEST=cargo test
BUG=None
Change-Id: I04cd9036db156bfa8b9bd49281347a2460fbff2c
Reviewed-on: https://chromium-review.googlesource.com/496988
Commit-Ready: Dylan Reid <dgreid@chromium.org>
Tested-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
