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| author |   Marek Majtyka <marek.majtyka@tieto.com> | 2015-09-16 12:04:55 +0200 |
|---|---|---|
| committer |   Marc Zyngier <marc.zyngier@arm.com> | 2015-09-16 14:50:45 +0100 |
| commit | ca09f02f122b2ecb0f5ddfc5fd47b29ed657d4fd (patch) | |
| tree | 5af4246ef7b215b3e689be3812cd197b410fc185 /arch/arm/kvm/arm.c | |
| parent | arm64: KVM: Fix user access for debug registers (diff) | |
| download | wireguard-linux-ca09f02f122b2ecb0f5ddfc5fd47b29ed657d4fd.tar.xz wireguard-linux-ca09f02f122b2ecb0f5ddfc5fd47b29ed657d4fd.zip | |
arm: KVM: Fix incorrect device to IPA mapping
A critical bug has been found in device memory stage1 translation for
VMs with more then 4GB of address space. Once vm_pgoff size is smaller
then pa (which is true for LPAE case, u32 and u64 respectively) some
more significant bits of pa may be lost as a shift operation is performed
on u32 and later cast onto u64.
Example: vm_pgoff(u32)=0x00210030, PAGE_SHIFT=12
expected pa(u64): 0x0000002010030000
produced pa(u64): 0x0000000010030000
The fix is to change the order of operations (casting first onto phys_addr_t
and then shifting).
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
[maz: fixed changelog and patch formatting]
Cc: stable@vger.kernel.org
Signed-off-by: Marek Majtyka <marek.majtyka@tieto.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions