3 files changed, 56 insertions, 10 deletions
diff --git a/pkg/sentry/fsimpl/proc/proc_state_autogen.go b/pkg/sentry/fsimpl/proc/proc_state_autogen.go
index 8303e846d..ebcb21edb 100644
--- a/pkg/sentry/fsimpl/proc/proc_state_autogen.go
+++ b/pkg/sentry/fsimpl/proc/proc_state_autogen.go
@@ -1977,6 +1977,31 @@ func (c *cgroupsData) StateLoad(stateSourceObject state.Source) {
 	stateSourceObject.Load(0, &c.dynamicBytesFileSetAttr)
 }
 
+func (c *cmdLineData) StateTypeName() string {
+	return "pkg/sentry/fsimpl/proc.cmdLineData"
+}
+
+func (c *cmdLineData) StateFields() []string {
+	return []string{
+		"dynamicBytesFileSetAttr",
+	}
+}
+
+func (c *cmdLineData) beforeSave() {}
+
+// +checklocksignore
+func (c *cmdLineData) StateSave(stateSinkObject state.Sink) {
+	c.beforeSave()
+	stateSinkObject.Save(0, &c.dynamicBytesFileSetAttr)
+}
+
+func (c *cmdLineData) afterLoad() {}
+
+// +checklocksignore
+func (c *cmdLineData) StateLoad(stateSourceObject state.Source) {
+	stateSourceObject.Load(0, &c.dynamicBytesFileSetAttr)
+}
+
 func (r *tasksInodeRefs) StateTypeName() string {
 	return "pkg/sentry/fsimpl/proc.tasksInodeRefs"
 }
@@ -2309,6 +2334,7 @@ func init() {
 	state.Register((*versionData)(nil))
 	state.Register((*filesystemsData)(nil))
 	state.Register((*cgroupsData)(nil))
+	state.Register((*cmdLineData)(nil))
 	state.Register((*tasksInodeRefs)(nil))
 	state.Register((*tcpMemDir)(nil))
 	state.Register((*mmapMinAddrData)(nil))
diff --git a/pkg/sentry/fsimpl/proc/tasks.go b/pkg/sentry/fsimpl/proc/tasks.go
index 7c7543f14..cf905fae4 100644
--- a/pkg/sentry/fsimpl/proc/tasks.go
+++ b/pkg/sentry/fsimpl/proc/tasks.go
@@ -65,6 +65,7 @@ var _ kernfs.Inode = (*tasksInode)(nil)
 func (fs *filesystem) newTasksInode(ctx context.Context, k *kernel.Kernel, pidns *kernel.PIDNamespace, fakeCgroupControllers map[string]string) *tasksInode {
 	root := auth.NewRootCredentials(pidns.UserNamespace())
 	contents := map[string]kernfs.Inode{
+		"cmdline":     fs.newInode(ctx, root, 0444, &cmdLineData{}),
 		"cpuinfo":     fs.newInode(ctx, root, 0444, newStaticFileSetStat(cpuInfoData(k))),
 		"filesystems": fs.newInode(ctx, root, 0444, &filesystemsData{}),
 		"loadavg":     fs.newInode(ctx, root, 0444, &loadavgData{}),
diff --git a/pkg/sentry/fsimpl/proc/tasks_files.go b/pkg/sentry/fsimpl/proc/tasks_files.go
index e1a8b4409..045ed7a2d 100644
--- a/pkg/sentry/fsimpl/proc/tasks_files.go
+++ b/pkg/sentry/fsimpl/proc/tasks_files.go
@@ -336,15 +336,6 @@ var _ dynamicInode = (*versionData)(nil)
 
 // Generate implements vfs.DynamicBytesSource.Generate.
 func (*versionData) Generate(ctx context.Context, buf *bytes.Buffer) error {
-	k := kernel.KernelFromContext(ctx)
-	init := k.GlobalInit()
-	if init == nil {
-		// Attempted to read before the init Task is created. This can
-		// only occur during startup, which should never need to read
-		// this file.
-		panic("Attempted to read version before initial Task is available")
-	}
-
 	// /proc/version takes the form:
 	//
 	// "SYSNAME version RELEASE (COMPILE_USER@COMPILE_HOST)
@@ -364,7 +355,7 @@ func (*versionData) Generate(ctx context.Context, buf *bytes.Buffer) error {
 	// FIXME(mpratt): Using Version from the init task SyscallTable
 	// disregards the different version a task may have (e.g., in a uts
 	// namespace).
-	ver := init.Leader().SyscallTable().Version
+	ver := kernelVersion(ctx)
 	fmt.Fprintf(buf, "%s version %s %s\n", ver.Sysname, ver.Release, ver.Version)
 	return nil
 }
@@ -400,3 +391,31 @@ func (*cgroupsData) Generate(ctx context.Context, buf *bytes.Buffer) error {
 	r.GenerateProcCgroups(buf)
 	return nil
 }
+
+// cmdLineData backs /proc/cmdline.
+//
+// +stateify savable
+type cmdLineData struct {
+	dynamicBytesFileSetAttr
+}
+
+var _ dynamicInode = (*cmdLineData)(nil)
+
+// Generate implements vfs.DynamicByteSource.Generate.
+func (*cmdLineData) Generate(ctx context.Context, buf *bytes.Buffer) error {
+	fmt.Fprintf(buf, "BOOT_IMAGE=/vmlinuz-%s-gvisor quiet\n", kernelVersion(ctx).Release)
+	return nil
+}
+
+// kernelVersion returns the kernel version.
+func kernelVersion(ctx context.Context) kernel.Version {
+	k := kernel.KernelFromContext(ctx)
+	init := k.GlobalInit()
+	if init == nil {
+		// Attempted to read before the init Task is created. This can
+		// only occur during startup, which should never need to read
+		// this file.
+		panic("Attempted to read version before initial Task is available")
+	}
+	return init.Leader().SyscallTable().Version
+}