Make sure that the fencePort received over IPC has the expected disposition (SEND)

• Component: WebKit2
• Status: RESOLVED FIXED

[Brent Fulgham]

We shouldn't blindly assume that the Mach Send Right we receive from the UIProcess in WebPage::setTopContentInsetFenced (and VideoFullscreenManager::setVideoLayerFrameFenced) will have the expected MACH_MSG_TYPE_MOVE_SEND disposition.

Instead, we should check that it meets expectations. If we discover a discrepancy, we should discard the message without touching the mach port contents.

[Brent Fulgham]

<rdar://problem/37814171>

[Brent Fulgham]

Created attachment 341800 [details]
Patch

[Geoffrey Garen]

Comment on attachment 341800 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=341800&action=review

r=me

> Source/WebKit/WebProcess/WebPage/WebPage.cpp:2664
> +    // Check for invalid message receipt. If this is not a send right, something has
> +    // gone wrong and we should discard this message.

I don't think this comment adds anything. It just kind of restates the code below.

> Source/WebKit/WebProcess/cocoa/VideoFullscreenManager.mm:568
> +    // Check for invalid message receipt. If this is not a send right, something has
> +    // gone wrong and we should discard this message.

Ditto.

[EWS Watchlist]

Comment on attachment 341800 [details]
Patch

Attachment 341800 [details] did not pass win-ews (win):
Output: http://webkit-queues.webkit.org/results/7941653

New failing tests:
http/tests/security/canvas-remote-read-remote-video-localhost.html

[EWS Watchlist]

Created attachment 341837 [details]
Archive of layout-test-results from ews206 for win-future

The attached test failures were seen while running run-webkit-tests on the win-ews.
Bot: ews206  Port: win-future  Platform: CYGWIN_NT-6.1-2.9.0-0.318-5-3-x86_64-64bit

[Brent Fulgham]

Created attachment 341867 [details]
Patch for landing

[WebKit Commit Bot]

Comment on attachment 341867 [details]
Patch for landing

Clearing flags on attachment: 341867

Committed r232451: <https://trac.webkit.org/changeset/232451>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.