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pierov pushed a commit to branch tor-browser-91.9.0esr-11.5-2 in repository tor-browser.
commit 5f704c50b8cc06b44be716860c0cee02e398cad4 Author: Georg Koppen gk@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 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; }