From 9c407382b031f16160f83383ef8b0d419457829a Mon Sep 17 00:00:00 2001
From: Ian Gudger <igudger@google.com>
Date: Tue, 21 Aug 2018 11:15:15 -0700
Subject: [PATCH] Fix races in kernel.(*Task).Value()

PiperOrigin-RevId: 209627180
Change-Id: Idc84afd38003427e411df6e75abfabd9174174e1
---
 pkg/sentry/kernel/task.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkg/sentry/kernel/task.go b/pkg/sentry/kernel/task.go
index 19029adb1..0f83c0a39 100644
--- a/pkg/sentry/kernel/task.go
+++ b/pkg/sentry/kernel/task.go
@@ -568,12 +568,18 @@ func (t *Task) Value(key interface{}) interface{} {
 	case CtxPIDNamespace:
 		return t.tg.pidns
 	case CtxUTSNamespace:
+		t.mu.Lock()
+		defer t.mu.Unlock()
 		return t.utsns
 	case CtxIPCNamespace:
+		t.mu.Lock()
+		defer t.mu.Unlock()
 		return t.ipcns
 	case CtxTask:
 		return t
 	case auth.CtxCredentials:
+		t.mu.Lock()
+		defer t.mu.Unlock()
 		return t.creds
 	case context.CtxThreadGroupID:
 		return int32(t.ThreadGroup().ID())