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| author | Punit Agrawal | 2018-01-04 19:24:33 +0100 |
|---|---|---|
| committer | Christoffer Dall | 2018-01-11 15:25:57 +0100 |
| commit | c507babf10ead4d5c8cca704539b170752a8ac84 (patch) | |
| tree | b2ca66e0864bf52c92e25495ffdde6554c7f366e /virt/kvm/arm/vgic/vgic-v4.c | |
| parent | KVM: arm/arm64: Fix timer enable flow (diff) | |
| download | kernel-qcow2-linux-c507babf10ead4d5c8cca704539b170752a8ac84.tar.gz kernel-qcow2-linux-c507babf10ead4d5c8cca704539b170752a8ac84.tar.xz kernel-qcow2-linux-c507babf10ead4d5c8cca704539b170752a8ac84.zip | |
KVM: arm/arm64: Check pagesize when allocating a hugepage at Stage 2
KVM only supports PMD hugepages at stage 2 but doesn't actually check
that the provided hugepage memory pagesize is PMD_SIZE before populating
stage 2 entries.
In cases where the backing hugepage size is smaller than PMD_SIZE (such
as when using contiguous hugepages), KVM can end up creating stage 2
mappings that extend beyond the supplied memory.
Fix this by checking for the pagesize of userspace vma before creating
PMD hugepage at stage 2.
Fixes: 66b3923a1a0f77a ("arm64: hugetlb: add support for PTE contiguous bit")
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: <stable@vger.kernel.org> # v4.5+
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt/kvm/arm/vgic/vgic-v4.c')
0 files changed, 0 insertions, 0 deletions