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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2019-09-03 23:16:27 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-06 11:21:00 +0300 |
| commit | 06ab420a84f0955360dca6c34faf2658d8cff1ce (patch) | |
| tree | b00d0b37bfd349077e91712dd70e3cd90a9ddb95 /virt/kvm | |
| parent | d5054c17d9fe31596e4e7a6c008e9361f6e0f776 (diff) | |
| download | linux-06ab420a84f0955360dca6c34faf2658d8cff1ce.tar.xz | |
KVM: PPC: Book3S: Fix incorrect guest-to-user-translation error handling
[ Upstream commit ddfd151f3def9258397fcde7a372205a2d661903 ]
H_PUT_TCE_INDIRECT handlers receive a page with up to 512 TCEs from
a guest. Although we verify correctness of TCEs before we do anything
with the existing tables, there is a small window when a check in
kvmppc_tce_validate might pass and right after that the guest alters
the page of TCEs, causing an early exit from the handler and leaving
srcu_read_lock(&vcpu->kvm->srcu) (virtual mode) or lock_rmap(rmap)
(real mode) locked.
This fixes the bug by jumping to the common exit code with an appropriate
unlock.
Cc: stable@vger.kernel.org # v4.11+
Fixes: 121f80ba68f1 ("KVM: PPC: VFIO: Add in-kernel acceleration for VFIO")
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'virt/kvm')
0 files changed, 0 insertions, 0 deletions