diff --git a/src/cdk-experimental/dialog/dialog-container.ts b/src/cdk-experimental/dialog/dialog-container.ts
index 28ac13210745..d36ec128cb4a 100644
--- a/src/cdk-experimental/dialog/dialog-container.ts
+++ b/src/cdk-experimental/dialog/dialog-container.ts
@@ -81,9 +81,9 @@ export class CdkDialogContainer extends BasePortalOutlet implements OnDestroy {
   @HostBinding('attr.aria-label') get _ariaLabel() { return this._config.ariaLabel || null; }
 
   @HostBinding('attr.aria-describedby')
-  get _ariaDescribedBy() { return this._config ? this._config.ariaDescribedBy : null; }
+  get _ariaDescribedBy() { return this._config.ariaDescribedBy; }
 
-  @HostBinding('attr.role') get _role() { return this._config ? this._config.role : null; }
+  @HostBinding('attr.role') get _role() { return this._config.role; }
 
   @HostBinding('attr.tabindex') get _tabindex() { return -1; }
   // tslint:disable:no-host-decorator-in-concrete
@@ -103,14 +103,13 @@ export class CdkDialogContainer extends BasePortalOutlet implements OnDestroy {
   /** A subject emitting after the dialog exits the view. */
   _afterExit: Subject<void> = new Subject();
 
-  /** The dialog configuration. */
-  _config: DialogConfig;
-
   constructor(
     private _elementRef: ElementRef,
     private _focusTrapFactory: FocusTrapFactory,
     private _changeDetectorRef: ChangeDetectorRef,
-    @Optional() @Inject(DOCUMENT) private _document: any) {
+    @Optional() @Inject(DOCUMENT) private _document: any,
+    /** The dialog configuration. */
+    public _config: DialogConfig) {
     super();
   }
 
diff --git a/src/cdk-experimental/dialog/dialog.ts b/src/cdk-experimental/dialog/dialog.ts
index 456789e9f6c3..e70bac23d8ec 100644
--- a/src/cdk-experimental/dialog/dialog.ts
+++ b/src/cdk-experimental/dialog/dialog.ts
@@ -178,8 +178,12 @@ export class Dialog {
    */
   protected _attachDialogContainer(overlay: OverlayRef, config: DialogConfig): CdkDialogContainer {
     const container = config.containerComponent || this.injector.get(DIALOG_CONTAINER);
-    let containerPortal = new ComponentPortal(container, config.viewContainerRef);
-    let containerRef: ComponentRef<CdkDialogContainer> = overlay.attach(containerPortal);
+    const userInjector = config && config.viewContainerRef && config.viewContainerRef.injector;
+    const injector = new PortalInjector(userInjector || this.injector, new WeakMap([
+      [DialogConfig, config]
+    ]));
+    const containerPortal = new ComponentPortal(container, config.viewContainerRef, injector);
+    const containerRef: ComponentRef<CdkDialogContainer> = overlay.attach(containerPortal);
     containerRef.instance._config = config;
 
     return containerRef.instance;
@@ -259,12 +263,11 @@ export class Dialog {
       dialogContainer: CdkDialogContainer): PortalInjector {
 
     const userInjector = config && config.viewContainerRef && config.viewContainerRef.injector;
-    const injectionTokens = new WeakMap();
-
-    injectionTokens
-      .set(this.injector.get(DIALOG_REF), dialogRef)
-      .set(this.injector.get(DIALOG_CONTAINER), dialogContainer)
-      .set(DIALOG_DATA, config.data);
+    const injectionTokens = new WeakMap<any, any>([
+      [this.injector.get(DIALOG_REF), dialogRef],
+      [this.injector.get(DIALOG_CONTAINER), dialogContainer],
+      [DIALOG_DATA, config.data]
+    ]);
 
     if (!userInjector || !userInjector.get<Directionality | null>(Directionality, null)) {
       injectionTokens.set(Directionality, {
diff --git a/src/cdk/overlay/position/flexible-connected-position-strategy.ts b/src/cdk/overlay/position/flexible-connected-position-strategy.ts
index bf507a58699a..8ebdfb28b26e 100644
--- a/src/cdk/overlay/position/flexible-connected-position-strategy.ts
+++ b/src/cdk/overlay/position/flexible-connected-position-strategy.ts
@@ -22,7 +22,6 @@ import {isElementScrolledOutsideView, isElementClippedByScrolling} from './scrol
 import {coerceCssPixelValue} from '@angular/cdk/coercion';
 import {Platform} from '@angular/cdk/platform';
 
-
 // TODO: refactor clipping detection into a separate thing (part of scrolling module)
 // TODO: doesn't handle both flexible width and height when it has to scroll along both axis.
 
diff --git a/src/lib/bottom-sheet/bottom-sheet-container.ts b/src/lib/bottom-sheet/bottom-sheet-container.ts
index 9753e15d0cf2..8797f04d3764 100644
--- a/src/lib/bottom-sheet/bottom-sheet-container.ts
+++ b/src/lib/bottom-sheet/bottom-sheet-container.ts
@@ -70,9 +70,6 @@ export class MatBottomSheetContainer extends BasePortalOutlet implements OnDestr
   /** Emits whenever the state of the animation changes. */
   _animationStateChanged = new EventEmitter<AnimationEvent>();
 
-  /** The bottom sheet configuration. */
-  bottomSheetConfig: MatBottomSheetConfig;
-
   /** The class that traps and manages focus within the bottom sheet. */
   private _focusTrap: FocusTrap;
 
@@ -90,7 +87,9 @@ export class MatBottomSheetContainer extends BasePortalOutlet implements OnDestr
     private _changeDetectorRef: ChangeDetectorRef,
     private _focusTrapFactory: FocusTrapFactory,
     breakpointObserver: BreakpointObserver,
-    @Optional() @Inject(DOCUMENT) document: any) {
+    @Optional() @Inject(DOCUMENT) document: any,
+    /** The bottom sheet configuration. */
+    public bottomSheetConfig: MatBottomSheetConfig) {
     super();
 
     this._document = document;
diff --git a/src/lib/bottom-sheet/bottom-sheet.ts b/src/lib/bottom-sheet/bottom-sheet.ts
index 6350707fc895..cee3fd220eda 100644
--- a/src/lib/bottom-sheet/bottom-sheet.ts
+++ b/src/lib/bottom-sheet/bottom-sheet.ts
@@ -103,9 +103,15 @@ export class MatBottomSheet {
    */
   private _attachContainer(overlayRef: OverlayRef,
                            config: MatBottomSheetConfig): MatBottomSheetContainer {
-    const containerPortal = new ComponentPortal(MatBottomSheetContainer, config.viewContainerRef);
+
+    const userInjector = config && config.viewContainerRef && config.viewContainerRef.injector;
+    const injector = new PortalInjector(userInjector || this._injector, new WeakMap([
+      [MatBottomSheetConfig, config]
+    ]));
+
+    const containerPortal =
+        new ComponentPortal(MatBottomSheetContainer, config.viewContainerRef, injector);
     const containerRef: ComponentRef<MatBottomSheetContainer> = overlayRef.attach(containerPortal);
-    containerRef.instance.bottomSheetConfig = config;
     return containerRef.instance;
   }
 
@@ -141,10 +147,10 @@ export class MatBottomSheet {
                              bottomSheetRef: MatBottomSheetRef<T>): PortalInjector {
 
     const userInjector = config && config.viewContainerRef && config.viewContainerRef.injector;
-    const injectionTokens = new WeakMap();
-
-    injectionTokens.set(MatBottomSheetRef, bottomSheetRef);
-    injectionTokens.set(MAT_BOTTOM_SHEET_DATA, config.data);
+    const injectionTokens = new WeakMap<any, any>([
+      [MatBottomSheetRef, bottomSheetRef],
+      [MAT_BOTTOM_SHEET_DATA, config.data]
+    ]);
 
     if (!userInjector || !userInjector.get<Directionality | null>(Directionality, null)) {
       injectionTokens.set(Directionality, {
diff --git a/src/lib/dialog/dialog-container.ts b/src/lib/dialog/dialog-container.ts
index 3a705be37521..5aa3437ee137 100644
--- a/src/lib/dialog/dialog-container.ts
+++ b/src/lib/dialog/dialog-container.ts
@@ -60,10 +60,10 @@ export function throwMatDialogContentAlreadyAttachedError() {
     'class': 'mat-dialog-container',
     'tabindex': '-1',
     '[attr.id]': '_id',
-    '[attr.role]': '_config?.role',
-    '[attr.aria-labelledby]': '_config?.ariaLabel ? null : _ariaLabelledBy',
-    '[attr.aria-label]': '_config?.ariaLabel',
-    '[attr.aria-describedby]': '_config?.ariaDescribedBy || null',
+    '[attr.role]': '_config.role',
+    '[attr.aria-labelledby]': '_config.ariaLabel ? null : _ariaLabelledBy',
+    '[attr.aria-label]': '_config.ariaLabel',
+    '[attr.aria-describedby]': '_config.ariaDescribedBy || null',
     '[@slideDialog]': '_state',
     '(@slideDialog.start)': '_onAnimationStart($event)',
     '(@slideDialog.done)': '_onAnimationDone($event)',
@@ -79,9 +79,6 @@ export class MatDialogContainer extends BasePortalOutlet {
   /** Element that was focused before the dialog was opened. Save this to restore upon close. */
   private _elementFocusedBeforeDialogWasOpened: HTMLElement | null = null;
 
-  /** The dialog configuration. */
-  _config: MatDialogConfig;
-
   /** State of the dialog animation. */
   _state: 'void' | 'enter' | 'exit' = 'enter';
 
@@ -98,7 +95,9 @@ export class MatDialogContainer extends BasePortalOutlet {
     private _elementRef: ElementRef,
     private _focusTrapFactory: FocusTrapFactory,
     private _changeDetectorRef: ChangeDetectorRef,
-    @Optional() @Inject(DOCUMENT) private _document: any) {
+    @Optional() @Inject(DOCUMENT) private _document: any,
+    /** The dialog configuration. */
+    public _config: MatDialogConfig) {
 
     super();
   }
diff --git a/src/lib/dialog/dialog.ts b/src/lib/dialog/dialog.ts
index d763cd9919ca..42de80f1ff9e 100644
--- a/src/lib/dialog/dialog.ts
+++ b/src/lib/dialog/dialog.ts
@@ -17,7 +17,6 @@ import {
 import {ComponentPortal, ComponentType, PortalInjector, TemplatePortal} from '@angular/cdk/portal';
 import {Location} from '@angular/common';
 import {
-  ComponentRef,
   Inject,
   inject,
   Injectable,
@@ -210,9 +209,13 @@ export class MatDialog {
    * @returns A promise resolving to a ComponentRef for the attached container.
    */
   private _attachDialogContainer(overlay: OverlayRef, config: MatDialogConfig): MatDialogContainer {
-    let containerPortal = new ComponentPortal(MatDialogContainer, config.viewContainerRef);
-    let containerRef: ComponentRef<MatDialogContainer> = overlay.attach(containerPortal);
-    containerRef.instance._config = config;
+    const userInjector = config && config.viewContainerRef && config.viewContainerRef.injector;
+    const injector = new PortalInjector(userInjector || this._injector, new WeakMap([
+      [MatDialogConfig, config]
+    ]));
+    const containerPortal =
+        new ComponentPortal(MatDialogContainer, config.viewContainerRef, injector);
+    const containerRef = overlay.attach<MatDialogContainer>(containerPortal);
 
     return containerRef.instance;
   }
@@ -278,16 +281,16 @@ export class MatDialog {
       dialogContainer: MatDialogContainer): PortalInjector {
 
     const userInjector = config && config.viewContainerRef && config.viewContainerRef.injector;
-    const injectionTokens = new WeakMap();
 
     // The MatDialogContainer is injected in the portal as the MatDialogContainer and the dialog's
     // content are created out of the same ViewContainerRef and as such, are siblings for injector
     // purposes. To allow the hierarchy that is expected, the MatDialogContainer is explicitly
     // added to the injection tokens.
-    injectionTokens
-      .set(MatDialogContainer, dialogContainer)
-      .set(MAT_DIALOG_DATA, config.data)
-      .set(MatDialogRef, dialogRef);
+    const injectionTokens = new WeakMap<any, any>([
+      [MatDialogContainer, dialogContainer],
+      [MAT_DIALOG_DATA, config.data],
+      [MatDialogRef, dialogRef]
+    ]);
 
     if (!userInjector || !userInjector.get<Directionality | null>(Directionality, null)) {
       injectionTokens.set(Directionality, {
diff --git a/src/lib/snack-bar/snack-bar-container.ts b/src/lib/snack-bar/snack-bar-container.ts
index 86fc42141050..1a1eec18c915 100644
--- a/src/lib/snack-bar/snack-bar-container.ts
+++ b/src/lib/snack-bar/snack-bar-container.ts
@@ -66,13 +66,13 @@ export class MatSnackBarContainer extends BasePortalOutlet implements OnDestroy
   /** The state of the snack bar animations. */
   _animationState = 'void';
 
-  /** The snack bar configuration. */
-  snackBarConfig: MatSnackBarConfig;
-
   constructor(
     private _ngZone: NgZone,
     private _elementRef: ElementRef,
-    private _changeDetectorRef: ChangeDetectorRef) {
+    private _changeDetectorRef: ChangeDetectorRef,
+    /** The snack bar configuration. */
+    public snackBarConfig: MatSnackBarConfig) {
+
     super();
   }
 
diff --git a/src/lib/snack-bar/snack-bar.ts b/src/lib/snack-bar/snack-bar.ts
index 1e28cf6ec9fa..7061d62dfede 100644
--- a/src/lib/snack-bar/snack-bar.ts
+++ b/src/lib/snack-bar/snack-bar.ts
@@ -130,7 +130,14 @@ export class MatSnackBar {
    */
   private _attachSnackBarContainer(overlayRef: OverlayRef,
                                    config: MatSnackBarConfig): MatSnackBarContainer {
-    const containerPortal = new ComponentPortal(MatSnackBarContainer, config.viewContainerRef);
+
+    const userInjector = config && config.viewContainerRef && config.viewContainerRef.injector;
+    const injector = new PortalInjector(userInjector || this._injector, new WeakMap([
+      [MatSnackBarConfig, config]
+    ]));
+
+    const containerPortal =
+        new ComponentPortal(MatSnackBarContainer, config.viewContainerRef, injector);
     const containerRef: ComponentRef<MatSnackBarContainer> = overlayRef.attach(containerPortal);
     containerRef.instance.snackBarConfig = config;
     return containerRef.instance;
@@ -257,11 +264,10 @@ export class MatSnackBar {
       snackBarRef: MatSnackBarRef<T>): PortalInjector {
 
     const userInjector = config && config.viewContainerRef && config.viewContainerRef.injector;
-    const injectionTokens = new WeakMap();
-
-    injectionTokens.set(MatSnackBarRef, snackBarRef);
-    injectionTokens.set(MAT_SNACK_BAR_DATA, config.data);
 
-    return new PortalInjector(userInjector || this._injector, injectionTokens);
+    return new PortalInjector(userInjector || this._injector, new WeakMap<any, any>([
+      [MatSnackBarRef, snackBarRef],
+      [MAT_SNACK_BAR_DATA, config.data]
+    ]));
   }
 }