It's possible for userspace to control intid. Sanitize intid when using it as an array index.
At the same time, sort the includes when adding <linux/nospec.h>. Found by smatch. Signed-off-by: Mark Rutland <[email protected]> Cc: Christoffer Dall <[email protected]> Cc: Marc Zyngier <[email protected]> Cc: [email protected] --- virt/kvm/arm/vgic/vgic.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index e74baec76361..bd125563b15b 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -14,11 +14,13 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ +#include <linux/interrupt.h> +#include <linux/irq.h> #include <linux/kvm.h> #include <linux/kvm_host.h> #include <linux/list_sort.h> -#include <linux/interrupt.h> -#include <linux/irq.h> +#include <linux/nospec.h> + #include <asm/kvm_hyp.h> #include "vgic.h" @@ -101,12 +103,16 @@ struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 intid) { /* SGIs and PPIs */ - if (intid <= VGIC_MAX_PRIVATE) + if (intid <= VGIC_MAX_PRIVATE) { + intid = array_index_nospec(intid, VGIC_MAX_PRIVATE); return &vcpu->arch.vgic_cpu.private_irqs[intid]; + } /* SPIs */ - if (intid <= VGIC_MAX_SPI) + if (intid <= VGIC_MAX_SPI) { + intid = array_index_nospec(intid, VGIC_MAX_SPI); return &kvm->arch.vgic.spis[intid - VGIC_NR_PRIVATE_IRQS]; + } /* LPIs */ if (intid >= VGIC_MIN_LPI) -- 2.11.0 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
