[tbb-commits] [tor-browser] 30/81: Bug 30541: Disable WebGL readPixel() for web content

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pierov pushed a commit to branch tor-browser-102.4.0esr-12.0-1
in repository tor-browser.

commit a14ad0a92bbdbeca5dfad7d28297a09abebacf1a
Author: Georg Koppen <gk at torproject.org>
AuthorDate: Wed May 29 12:29:19 2019 +0000

    Bug 30541: Disable WebGL readPixel() for web content
    
    Related Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1428034
---
 dom/canvas/ClientWebGLContext.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/dom/canvas/ClientWebGLContext.cpp b/dom/canvas/ClientWebGLContext.cpp
index 1a509d616944..7784dca24a61 100644
--- a/dom/canvas/ClientWebGLContext.cpp
+++ b/dom/canvas/ClientWebGLContext.cpp
@@ -4908,6 +4908,14 @@ bool ClientWebGLContext::ReadPixels_SharedPrecheck(
     return false;
   }
 
+  // Security check passed, but don't let content readPixel calls through for
+  // now, if Resist Fingerprinting Mode is enabled.
+  if (nsContentUtils::ResistFingerprinting(aCallerType)) {
+    JsWarning("readPixels: Not allowed in Resist Fingerprinting Mode");
+    out_error.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+    return false;
+  }
+
   return true;
 }
 

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