[tor-commits] [tor-browser] 33/69: Bug 30541: Disable WebGL readPixel() for web content

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richard pushed a commit to annotated tag FIREFOX_91_9_0esr_BUILD1
in repository tor-browser.

commit 68031deba46698113bb85e7fcac8e0d313d45de6
Author: Georg Koppen <gk at torproject.org>
AuthorDate: Wed May 29 12:29:19 2019 +0000

    Bug 30541: Disable WebGL readPixel() for web content
---
 dom/canvas/ClientWebGLContext.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/dom/canvas/ClientWebGLContext.cpp b/dom/canvas/ClientWebGLContext.cpp
index 7f7dc1e85c307..bba4fccc1fab5 100644
--- a/dom/canvas/ClientWebGLContext.cpp
+++ b/dom/canvas/ClientWebGLContext.cpp
@@ -4654,6 +4654,14 @@ 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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