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richard pushed a commit to branch geckoview-102.4.0esr-11.5-1 in repository tor-browser.
commit 953072b1c950ecbcd7f1834f2bef10b1412a7b1b Author: Georg Koppen gk@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 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; }