arm: KVM: Fix VTTBR_BADDR_MASK BUG_ON off-by-one
authorMarc Zyngier <marc.zyngier@arm.com>
Thu, 16 Nov 2017 17:58:21 +0000 (17:58 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 14 Dec 2017 08:53:00 +0000 (09:53 +0100)
commitba8cbedca6dfca432db2eb9ed4013a2dcb358a71
tree5703d5a06f2e744bbbff7ecbf5d86590b7f3f6c0
parentc4e71b6f7fd75ff372e766e01aded59d869d7cec
arm: KVM: Fix VTTBR_BADDR_MASK BUG_ON off-by-one

commit 5553b142be11e794ebc0805950b2e8313f93d718 upstream.

VTTBR_BADDR_MASK is used to sanity check the size and alignment of the
VTTBR address. It seems to currently be off by one, thereby only
allowing up to 39-bit addresses (instead of 40-bit) and also
insufficiently checking the alignment. This patch fixes it.

This patch is the 32bit pendent of Kristina's arm64 fix, and
she deserves the actual kudos for pinpointing that one.

Fixes: f7ed45be3ba52 ("KVM: ARM: World-switch implementation")
Reported-by: Kristina Martsenko <kristina.martsenko@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/arm/include/asm/kvm_arm.h