On Wed, Nov 29, 2017 at 11:38:22AM -0500, Serhii Popovych wrote:
> It is possible to trigger use after free during HPT resize
> causing host kernel to crash. More details and analysis of
> the problem can be found in change with corresponding subject
> (KVM: PPC: Book3S HV: Fix use after free in case of multiple
> resize requests).
>
> We need some changes to prepare for the fix, especially
> make ->error in HPT resize instance single point for
> tracking allocation state, improve kvmppc_allocate_hpt()
> and kvmppc_free_hpt() so they can be used more safely.
>
> See individual commit description message to get more
> information on changes presented.
>
> Serhii Popovych (4):
> KVM: PPC: Book3S HV: Drop prepare_done from struct kvm_resize_hpt and
> cleanups
> KVM: PPC: Book3S HV: Improve kvmppc_allocate_hpt()/kvmppc_free_hpt()
> KVM: PPC: Book3S HV: Fix use after free in case of multiple resize
> requests
> KVM: PPC: Book3S HV: Remove redundant parameter from
> resize_hpt_release()
>
> arch/powerpc/kvm/book3s_64_mmu_hv.c | 139 +++++++++++++++++++++---------------
> 1 file changed, 82 insertions(+), 57 deletions(-)
Paul, these (at least 1-3) fix (another :() host crash bug which can
be triggered by guest and/or userspace actions. Please merge ASAP.
--
David Gibson | I'll have my music baroque, and my code
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