Save/restore simple devices.

We weren't saving simple devices' last allocated inode numbers, which
caused inode number reuse across S/R.

PiperOrigin-RevId: 241414245
Change-Id: I964289978841ef0a57d2fa48daf8eab7633c1284

3 files changed, 16 insertions, 0 deletions

diff --git a/pkg/sentry/kernel/BUILD b/pkg/sentry/kernel/BUILD
index 4d34bc733..99a2fd964 100644
--- a/pkg/sentry/kernel/BUILD
+++ b/pkg/sentry/kernel/BUILD
@@ -137,6 +137,7 @@ go_library(
     importpath = "gvisor.googlesource.com/gvisor/pkg/sentry/kernel",
     imports = [
         "gvisor.googlesource.com/gvisor/pkg/bpf",
+        "gvisor.googlesource.com/gvisor/pkg/sentry/device",
         "gvisor.googlesource.com/gvisor/pkg/tcpip",
     ],
     visibility = ["//:sandbox"],
@@ -156,6 +157,7 @@ go_library(
         "//pkg/secio",
         "//pkg/sentry/arch",
         "//pkg/sentry/context",
+        "//pkg/sentry/device",
         "//pkg/sentry/fs",
         "//pkg/sentry/fs/lock",
         "//pkg/sentry/fs/timerfd",
diff --git a/pkg/sentry/kernel/kernel.go b/pkg/sentry/kernel/kernel.go
index f5cbd6c23..f7f471aaa 100644
--- a/pkg/sentry/kernel/kernel.go
+++ b/pkg/sentry/kernel/kernel.go
@@ -185,6 +185,9 @@ type Kernel struct {
 	// socketTable is used to track all sockets on the system. Protected by
 	// extMu.
 	socketTable map[int]map[*refs.WeakRef]struct{}
+
+	// deviceRegistry is used to save/restore device.SimpleDevices.
+	deviceRegistry struct{} `state:".(*device.Registry)"`
 }
 
 // InitKernelArgs holds arguments to Init.
diff --git a/pkg/sentry/kernel/kernel_state.go b/pkg/sentry/kernel/kernel_state.go
index a0a69b498..aae6f9ad2 100644
--- a/pkg/sentry/kernel/kernel_state.go
+++ b/pkg/sentry/kernel/kernel_state.go
@@ -15,6 +15,7 @@
 package kernel
 
 import (
+	"gvisor.googlesource.com/gvisor/pkg/sentry/device"
 	"gvisor.googlesource.com/gvisor/pkg/tcpip"
 )
 
@@ -29,3 +30,13 @@ func (k *Kernel) loadDanglingEndpoints(es []tcpip.Endpoint) {
 		tcpip.AddDanglingEndpoint(e)
 	}
 }
+
+// saveDeviceRegistry is invoked by stateify.
+func (k *Kernel) saveDeviceRegistry() *device.Registry {
+	return device.SimpleDevices
+}
+
+// loadDeviceRegistry is invoked by stateify.
+func (k *Kernel) loadDeviceRegistry(r *device.Registry) {
+	device.SimpleDevices.LoadFrom(r)
+}