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| author |   Alexey Kardashevskiy <aik@ozlabs.ru> | 2019-08-26 14:55:20 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-08-30 09:40:14 +1000 |
| commit | 4f916593be9da38c5cf0d3a5c386b57beb70f422 (patch) | |
| tree | 4355102b215462c3f8242b808cf640fa5b7ae113 /arch/powerpc/kernel/iommu.c | |
| parent | powerpc/xive: Implement get_irqchip_state method for XIVE to fix shutdown race (diff) | |
| download | linux-dev-4f916593be9da38c5cf0d3a5c386b57beb70f422.tar.xz linux-dev-4f916593be9da38c5cf0d3a5c386b57beb70f422.zip | |
KVM: PPC: Book3S: Fix incorrect guest-to-user-translation error handling
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 with TCEs which can cause early exit from the handler and
leave 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.
Fixes: 121f80ba68f1 ("KVM: PPC: VFIO: Add in-kernel acceleration for VFIO")
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190826045520.92153-1-aik@ozlabs.ru
Diffstat (limited to 'arch/powerpc/kernel/iommu.c')
0 files changed, 0 insertions, 0 deletions