commit 2d386f0b0ce34aaf97b814da1867bb94a93b62a2 Author: Kathy Brade brade@pearlcrescent.com Date: Wed Apr 19 16:29:59 2017 -0400

fixup! Bug 12827: Create preference to disable SVG.

If the top window's URI is not available, check for the system principal to determine if SVGs may be used. This fixes bug 21962. --- layout/svg/nsSVGUtils.cpp | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/layout/svg/nsSVGUtils.cpp b/layout/svg/nsSVGUtils.cpp index 1217e92..98dd287e 100644 --- a/layout/svg/nsSVGUtils.cpp +++ b/layout/svg/nsSVGUtils.cpp @@ -114,6 +114,7 @@ NS_SVGEnabledForChannel(nsIChannel *aChannel)

#ifdef DEBUG_SVG_ENABLE nsAutoCString topDocSpec; // Set if approved via a whitelisted top doc. + bool checkedSystemPrincipal = false; #endif

bool isSVGAllowed = false; @@ -152,6 +153,18 @@ NS_SVGEnabledForChannel(nsIChannel *aChannel) if (isSVGAllowed) topDocURI->GetSpec(topDocSpec); #endif + } else { + // Unable to retrieve the top window's URI. Fallback to checking + // the system principal (see bug 21962). +#ifdef DEBUG_SVG_ENABLE + checkedSystemPrincipal = true; +#endif + nsCOMPtr<nsIScriptObjectPrincipal> scriptObjPrin = + do_QueryInterface(topWin); + if (scriptObjPrin) { + isSVGAllowed = nsContentUtils::IsSystemPrincipal( + scriptObjPrin->GetPrincipal()); + } } } } @@ -166,7 +179,10 @@ NS_SVGEnabledForChannel(nsIChannel *aChannel) if (uri) uri->GetSpec(spec);

- if (topDocSpec.IsEmpty()) { + if (checkedSystemPrincipal) { + printf("NS_SVGEnabledForChannel for %s: %s (via system principal check)\n", + spec.get(), isSVGAllowed ? "YES" : "NO"); + } else if (topDocSpec.IsEmpty()) { printf("NS_SVGEnabledForChannel for %s: %s\n", spec.get(), isSVGAllowed ? "YES" : "NO"); } else {