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KVM: arm/arm64: vgic: fix possible spectre-v1 in vgic_get_irq()

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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 <mark.rutland@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: kvmarm@lists.cs.columbia.edu
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland 2018-04-25 17:13:41 +01:00 committed by Will Deacon
parent 19791a7ca6
commit 41b87599c7
1 changed files with 10 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

14
virt/kvm/arm/vgic/vgic.c
View file

@ -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)