kvm: handle errors of applyVirtualRegions

PiperOrigin-RevId: 487845220

pkg/sentry/platform/kvm/machine_amd64.go

@@ -445,7 +445,7 @@ func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *linux.SignalInfo)
 func (m *machine) mapUpperHalf(pageTable *pagetables.PageTables) {
 	// Map all the executable regions so that all the entry functions
 	// are mapped in the upper half.
-	applyVirtualRegions(func(vr virtualRegion) {
+	if err := applyVirtualRegions(func(vr virtualRegion) {
 		if excludeVirtualRegion(vr) || vr.filename == "[vsyscall]" {
 			return
 		}
@@ -462,7 +462,9 @@ func (m *machine) mapUpperHalf(pageTable *pagetables.PageTables) {
 				pagetables.MapOpts{AccessType: hostarch.Execute, Global: true},
 				physical)
 		}
-	})
+	}); err != nil {
+		panic(fmt.Sprintf("error parsing /proc/self/maps: %v", err))
+	}
 	for start, end := range m.kernel.EntryRegions() {
 		regionLen := end - start
 		physical, length, ok := translateToPhysical(start)

pkg/sentry/platform/kvm/machine_arm64.go

@@ -18,6 +18,7 @@
 package kvm
 
 import (
+	"fmt"
 	"runtime"
 
 	"golang.org/x/sys/unix"
@@ -65,7 +66,7 @@ func (m *machine) mapUpperHalf(pageTable *pagetables.PageTables) {
 // physical regions form them.
 func archPhysicalRegions(physicalRegions []physicalRegion) []physicalRegion {
 	rdRegions := []virtualRegion{}
-	applyVirtualRegions(func(vr virtualRegion) {
+	if err := applyVirtualRegions(func(vr virtualRegion) {
 		if excludeVirtualRegion(vr) {
 			return // skip region.
 		}
@@ -74,7 +75,9 @@ func archPhysicalRegions(physicalRegions []physicalRegion) []physicalRegion {
 		if !vr.accessType.Write && vr.accessType.Read {
 			rdRegions = append(rdRegions, vr)
 		}
-	})
+	}); err != nil {
+		panic(fmt.Sprintf("error parsing /proc/self/maps: %v", err))
+	}
 
 	// Add an unreachable region.
 	rdRegions = append(rdRegions, virtualRegion{

pkg/sentry/platform/kvm/physical_map.go

@@ -60,13 +60,15 @@ func fillAddressSpace() (excludedRegions []region) {
 	pSize -= reservedMemory
 
 	// Add specifically excluded regions; see excludeVirtualRegion.
-	applyVirtualRegions(func(vr virtualRegion) {
+	if err := applyVirtualRegions(func(vr virtualRegion) {
 		if excludeVirtualRegion(vr) {
 			excludedRegions = append(excludedRegions, vr.region)
 			vSize -= vr.length
 			log.Infof("excluded: virtual [%x,%x)", vr.virtual, vr.virtual+vr.length)
 		}
-	})
+	}); err != nil {
+		panic(fmt.Sprintf("error parsing /proc/self/maps: %v", err))
+	}
 
 	// Do we need any more work?
 	if vSize < pSize {