linux-kernel - [PATCH 0/4] Fix use after free in HPT resizing code and related minor improvements

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Message-Id: <1511973506-65683-1-git-send-email-spopovyc@redhat.com>
Date:   Wed, 29 Nov 2017 11:38:22 -0500
From:   Serhii Popovych <spopovyc@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     michael@...erman.id.au, paulus@...ba.org,
        linuxppc-dev@...ts.ozlabs.org, kvm-ppc@...r.kernel.org,
        david@...son.dropbear.id.au
Subject: [PATCH 0/4] Fix use after free in HPT resizing code and related minor improvements

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(-)

-- 
1.8.3.1