On Sat, Sep 14, 2024 at 3:14 AM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > Fix a long-standing goof in the coalesced IO code, and a lurking bug in > kvm_clear_guest(). > > The following changes since commit 47ac09b91befbb6a235ab620c32af719f8208399: > > Linux 6.11-rc4 (2024-08-18 13:17:27 -0700) > > are available in the Git repository at: > > https://github.com/kvm-x86/linux.git tags/kvm-x86-generic-6.12 > > for you to fetch changes up to 025dde582bbf31e7618f9283594ef5e2408e384b: > > KVM: Harden guest memory APIs against out-of-bounds accesses (2024-09-09 20:15:34 -0700) Pulled, thanks. Paolo > ---------------------------------------------------------------- > KVK generic changes for 6.12: > > - Fix a bug that results in KVM prematurely exiting to userspace for coalesced > MMIO/PIO in many cases, clean up the related code, and add a testcase. > > - Fix a bug in kvm_clear_guest() where it would trigger a buffer overflow _if_ > the gpa+len crosses a page boundary, which thankfully is guaranteed to not > happen in the current code base. Add WARNs in more helpers that read/write > guest memory to detect similar bugs. > > ---------------------------------------------------------------- > Ilias Stamatis (1): > KVM: Fix coalesced_mmio_has_room() to avoid premature userspace exit > > Sean Christopherson (4): > KVM: selftests: Add a test for coalesced MMIO (and PIO on x86) > KVM: Clean up coalesced MMIO ring full check > KVM: Write the per-page "segment" when clearing (part of) a guest page > KVM: Harden guest memory APIs against out-of-bounds accesses > > tools/testing/selftests/kvm/Makefile | 3 + > tools/testing/selftests/kvm/coalesced_io_test.c | 236 ++++++++++++++++++++++++ > tools/testing/selftests/kvm/include/kvm_util.h | 26 +++ > virt/kvm/coalesced_mmio.c | 31 +--- > virt/kvm/kvm_main.c | 11 +- > 5 files changed, 283 insertions(+), 24 deletions(-) > create mode 100644 tools/testing/selftests/kvm/coalesced_io_test.c >
