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KVM: arm64: Fix buffer overflow in kvm_arm_set_fw_reg()
commita25bc8486f
upstream. The KVM_REG_SIZE() comes from the ioctl and it can be a power of two between 0-32768 but if it is more than sizeof(long) this will corrupt memory. Fixes:99adb56763
("KVM: arm/arm64: Add save/restore support for firmware workaround state") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Reviewed-by: Steven Price <steven.price@arm.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/4efbab8c-640f-43b2-8ac6-6d68e08280fe@kili.mountain Signed-off-by: Oliver Upton <oliver.upton@linux.dev> [will: kvm_arm_set_fw_reg() lives in psci.c not hypercalls.c] Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -508,6 +508,8 @@ int kvm_arm_set_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
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u64 val;
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int wa_level;
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if (KVM_REG_SIZE(reg->id) != sizeof(val))
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return -ENOENT;
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if (copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id)))
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return -EFAULT;
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