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[Lockdown Mode] Disable XSLT parsing for WebKit in Lockdown Mode #47305

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@ronan-apple ronan-apple commented Jun 27, 2025 •
edited by webkit-early-warning-system
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5980209

[Lockdown Mode] Disable XSLT parsing for WebKit in Lockdown Mode
https://bugs.webkit.org/show_bug.cgi?id=295107
<rdar://problem/151845594>

Reviewed by NOBODY (OOPS!).

This patch disables XSLT support when in Lockdown Mode by removing
access to the XSLTProcessor constructor to prevent JavaScript usage,
and preventing detection of a stylesheet as XSL unless a newly
introduced feature flag is enabled.

The feature flag is enabled by default and disabled in LDM to prevent
any change in current behaviour.

Added LayoutTests that ensure XSLTProcessor is inaccessible, and suitably
check an XML document with a stylesheet is not processed when in LDM.

* LayoutTests/dom/xsl/lockdown-mode/XSLT-disabled.xml: Added.
* LayoutTests/dom/xsl/lockdown-mode/XSLT-disabled.xsl: Added.
* LayoutTests/js/dom/lockdown-mode/XSLTProcessor-disabled-expected.txt: Added.
* LayoutTests/js/dom/lockdown-mode/XSLTProcessor-disabled.html: Added.
* LayoutTests/js/dom/lockdown-mode/script-tests/XSLTProcessor-disabled.js: Added.
* LayoutTests/platform/glib/TestExpectations:
* LayoutTests/platform/ios/dom/xsl/lockdown-mode/XSLT-disabled-expected.txt: Added.
* LayoutTests/platform/mac-wk1/TestExpectations:
* LayoutTests/platform/mac/dom/xsl/lockdown-mode/XSLT-disabled-expected.txt: Added.
* LayoutTests/platform/win/TestExpectations:
* LayoutTests/platform/wpe/TestExpectations:
* Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml:
* Source/WebCore/bindings/js/WebCoreBuiltinNames.h:
* Source/WebCore/dom/Document.cpp:
(WebCore::Document::scheduleToApplyXSLTransforms):
* Source/WebCore/dom/ProcessingInstruction.cpp:
(WebCore::ProcessingInstruction::checkStyleSheet):
* Source/WebCore/xml/XSLTProcessor.idl:

5980209

Misc iOS, visionOS, tvOS & watchOS macOS Linux Windows
✅ 🧪 style ✅ 🛠 ios ✅ 🛠 mac ✅ 🛠 wpe ✅ 🛠 win
✅ 🧪 bindings ✅ 🛠 ios-sim ✅ 🛠 mac-AS-debug ✅ 🧪 wpe-wk2 ⏳ 🧪 win-tests
✅ 🧪 webkitperl ✅ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
✅ 🧪 ios-wk2-wpt ✅ 🧪 mac-wk1 ✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc ✅ 🧪 api-ios ✅ 🧪 mac-wk2 ✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64 ✅ 🛠 vision ✅ 🧪 mac-AS-debug-wk2 ✅ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-wk2-stress ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-intel-wk2   🛠 playstation
✅ 🛠 tv ✅ 🛠 mac-safer-cpp ✅ 🛠 jsc-armv7
✅ 🛠 tv-sim ✅ 🧪 jsc-armv7-tests
✅ 🛠 watch
✅ 🛠 watch-sim

@ronan-apple ronan-apple requested review from cdumez, rniwa and a team as code owners June 27, 2025 16:33
@ronan-apple ronan-apple self-assigned this Jun 27, 2025
@ronan-apple ronan-apple added the New Bugs Unclassified bugs are placed in this component until the correct component can be determined. label Jun 27, 2025
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webkit-early-warning-system commented Jun 27, 2025 •
edited
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EWS run on previous version of this PR (hash bcc70c6)

Misc iOS, visionOS, tvOS & watchOS macOS Linux Windows
✅ 🧪 style ✅ 🛠 ios ✅ 🛠 mac ✅ 🛠 wpe ✅ 🛠 win
✅ 🧪 bindings ✅ 🛠 ios-sim ✅ 🛠 mac-AS-debug ❌ 🧪 wpe-wk2 ⏳ 🧪 win-tests
✅ 🧪 webkitperl ❌ 🧪 ios-wk2 ✅ 🧪 api-mac ❌ 🧪 api-wpe
❌ 🧪 ios-wk2-wpt ❌ 🧪 mac-wk1 ✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc ✅ 🧪 api-ios ✅ 🧪 mac-wk2 ✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64 ✅ 🛠 vision ✅ 🧪 mac-AS-debug-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-wk2-stress ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-intel-wk2   🛠 playstation
✅ 🛠 tv loading 🛠 mac-safer-cpp ✅ 🛠 jsc-armv7
✅ 🛠 tv-sim ❌ 🧪 jsc-armv7-tests
✅ 🛠 watch
✅ 🛠 watch-sim

@ronan-apple
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Didn't realise this would kick off adding people as reviewers already! Pre-emptively pushing this one up to check tests (I think I'll need to sort out expected results for other platforms for new LayoutTests), and to get an early review from people. Feedback welcome!

lilyspiniolas
lilyspiniolas reviewed Jun 27, 2025
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LayoutTests/dom/xsl/lockdown-mode/XSLT-disabled.xsl Outdated
Transform - <xsl:value-of select="."/>
</xsl:template>

</xsl:stylesheet>
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nit: add empty newline at EOF

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Ah, thank you! Fixed!

lilyspiniolas
lilyspiniolas reviewed Jun 27, 2025
View reviewed changes
LayoutTests/js/dom/lockdown-mode/script-tests/XSLTProcessor-disabled.js Outdated
"XSLTProcessor disabled test"
);

shouldBeTrue("typeof(XSLTProcessor) === 'undefined'");
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nit: add empty newline at EOF

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Ah, thank you! Fixed!

@webkit-ews-buildbot webkit-ews-buildbot added the merging-blocked Applied to prevent a change from being merged label Jun 27, 2025
@ronan-apple ronan-apple removed the merging-blocked Applied to prevent a change from being merged label Jun 30, 2025
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webkit-early-warning-system commented Jun 30, 2025 •
edited
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EWS run on previous version of this PR (hash c90770b)

Misc iOS, visionOS, tvOS & watchOS macOS Linux Windows
❌ 🧪 style ❌ 🛠 ios ❌ 🛠 mac ❌ 🛠 wpe   🛠 win
❌ 🧪 bindings ❌ 🛠 ios-sim ❌ 🛠 mac-AS-debug ❌ 🧪 wpe-wk2   🧪 win-tests
❌ 🧪 webkitperl ❌ 🧪 ios-wk2 ❌ 🧪 api-mac ❌ 🧪 api-wpe
❌ 🧪 ios-wk2-wpt ❌ 🧪 mac-wk1   🛠 wpe-cairo
❌ 🛠 🧪 jsc ❌ 🧪 api-ios ❌ 🧪 mac-wk2 ❌ 🛠 gtk
❌ 🛠 🧪 jsc-arm64 ❌ 🛠 vision ❌ 🧪 mac-AS-debug-wk2 ❌ 🧪 gtk-wk2
❌ 🛠 vision-sim ❌ 🧪 mac-wk2-stress ❌ 🧪 api-gtk
⏳ 🧪 vision-wk2 ❌ 🧪 mac-intel-wk2   🛠 playstation
❌ 🛠 tv ❌ 🛠 mac-safer-cpp ❌ 🛠 jsc-armv7
❌ 🛠 tv-sim ❌ 🧪 jsc-armv7-tests
❌ 🛠 watch
❌ 🛠 watch-sim

@webkit-early-warning-system
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webkit-early-warning-system commented Jun 30, 2025 •
edited
Loading

EWS run on previous version of this PR (hash 4978d53)

Misc iOS, visionOS, tvOS & watchOS macOS Linux Windows
✅ 🧪 style ✅ 🛠 ios ✅ 🛠 mac ✅ 🛠 wpe   🛠 win
✅ 🧪 bindings ✅ 🛠 ios-sim ✅ 🛠 mac-AS-debug   🧪 wpe-wk2   🧪 win-tests
✅ 🧪 webkitperl   🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
  🧪 ios-wk2-wpt   🧪 mac-wk1 ✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc ✅ 🧪 api-ios ✅ 🧪 mac-wk2 ✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64 ✅ 🛠 vision   🧪 mac-AS-debug-wk2   🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-wk2-stress   🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-intel-wk2   🛠 playstation
✅ 🛠 tv ✅ 🛠 mac-safer-cpp ✅ 🛠 jsc-armv7
✅ 🛠 tv-sim ❌ 🧪 jsc-armv7-tests
✅ 🛠 watch
✅ 🛠 watch-sim

@webkit-early-warning-system
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webkit-early-warning-system commented Jun 30, 2025 •
edited
Loading

EWS run on previous version of this PR (hash ff86c20)

Misc iOS, visionOS, tvOS & watchOS macOS Linux Windows
✅ 🧪 style ✅ 🛠 ios ✅ 🛠 mac ✅ 🛠 wpe ✅ 🛠 win
✅ 🧪 bindings ✅ 🛠 ios-sim ✅ 🛠 mac-AS-debug ✅ 🧪 wpe-wk2 ⏳ 🧪 win-tests
✅ 🧪 webkitperl ❌ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
❌ 🧪 ios-wk2-wpt ❌ 🧪 mac-wk1 ✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc ✅ 🧪 api-ios ✅ 🧪 mac-wk2 ❌ 🛠 gtk
✅ 🛠 🧪 jsc-arm64 ✅ 🛠 vision ✅ 🧪 mac-AS-debug-wk2 ❌ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-wk2-stress ❌ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-intel-wk2   🛠 playstation
✅ 🛠 tv ✅ 🛠 mac-safer-cpp ✅ 🛠 jsc-armv7
✅ 🛠 tv-sim ✅ 🧪 jsc-armv7-tests
✅ 🛠 watch
✅ 🛠 watch-sim

@webkit-ews-buildbot webkit-ews-buildbot added the merging-blocked Applied to prevent a change from being merged label Jun 30, 2025
@ronan-apple ronan-apple marked this pull request as draft July 1, 2025 08:37
@ronan-apple ronan-apple removed the merging-blocked Applied to prevent a change from being merged label Jul 1, 2025
@webkit-early-warning-system
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webkit-early-warning-system commented Jul 1, 2025 •
edited
Loading

EWS run on previous version of this PR (hash 1dfd8d8)

Misc iOS, visionOS, tvOS & watchOS macOS Linux Windows
❌ 🧪 style ❌ 🛠 ios ❌ 🛠 mac ❌ 🛠 wpe ❌ 🛠 win
❌ 🧪 bindings ❌ 🛠 ios-sim ❌ 🛠 mac-AS-debug ❌ 🧪 wpe-wk2 ❌ 🧪 win-tests
❌ 🧪 webkitperl ❌ 🧪 ios-wk2 ❌ 🧪 api-mac ❌ 🧪 api-wpe
❌ 🧪 ios-wk2-wpt ❌ 🧪 mac-wk1 ❌ 🛠 wpe-cairo
❌ 🛠 🧪 jsc ❌ 🧪 api-ios ❌ 🧪 mac-wk2 ❌ 🛠 gtk
❌ 🛠 🧪 jsc-arm64 ❌ 🛠 vision ❌ 🧪 mac-AS-debug-wk2 ❌ 🧪 gtk-wk2
❌ 🛠 vision-sim ❌ 🧪 mac-wk2-stress ❌ 🧪 api-gtk
⏳ 🧪 vision-wk2 ❌ 🧪 mac-intel-wk2 ❌ 🛠 playstation
❌ 🛠 tv ❌ 🛠 mac-safer-cpp ❌ 🛠 jsc-armv7
❌ 🛠 tv-sim ❌ 🧪 jsc-armv7-tests
❌ 🛠 watch
❌ 🛠 watch-sim

[Lockdown Mode] Disable XSLT parsing for WebKit in Lockdown Mode
5980209 
https://bugs.webkit.org/show_bug.cgi?id=295107
<rdar://problem/151845594>

Reviewed by NOBODY (OOPS!).

This patch disables XSLT support when in Lockdown Mode by removing
access to the XSLTProcessor constructor to prevent JavaScript usage,
and preventing detection of a stylesheet as XSL unless a newly
introduced feature flag is enabled.

The feature flag is enabled by default and disabled in LDM to prevent
any change in current behaviour.

Added LayoutTests that ensure XSLTProcessor is inaccessible, and suitably
check an XML document with a stylesheet is not processed when in LDM.

* LayoutTests/dom/xsl/lockdown-mode/XSLT-disabled.xml: Added.
* LayoutTests/dom/xsl/lockdown-mode/XSLT-disabled.xsl: Added.
* LayoutTests/js/dom/lockdown-mode/XSLTProcessor-disabled-expected.txt: Added.
* LayoutTests/js/dom/lockdown-mode/XSLTProcessor-disabled.html: Added.
* LayoutTests/js/dom/lockdown-mode/script-tests/XSLTProcessor-disabled.js: Added.
* LayoutTests/platform/glib/TestExpectations:
* LayoutTests/platform/ios/dom/xsl/lockdown-mode/XSLT-disabled-expected.txt: Added.
* LayoutTests/platform/mac-wk1/TestExpectations:
* LayoutTests/platform/mac/dom/xsl/lockdown-mode/XSLT-disabled-expected.txt: Added.
* LayoutTests/platform/win/TestExpectations:
* LayoutTests/platform/wpe/TestExpectations:
* Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml:
* Source/WebCore/bindings/js/WebCoreBuiltinNames.h:
* Source/WebCore/dom/Document.cpp:
(WebCore::Document::scheduleToApplyXSLTransforms):
* Source/WebCore/dom/ProcessingInstruction.cpp:
(WebCore::ProcessingInstruction::checkStyleSheet):
* Source/WebCore/xml/XSLTProcessor.idl:
@webkit-early-warning-system
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webkit-early-warning-system commented Jul 1, 2025 •
edited
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EWS run on current version of this PR (hash 5980209)

Misc iOS, visionOS, tvOS & watchOS macOS Linux Windows
✅ 🧪 style ✅ 🛠 ios ✅ 🛠 mac ✅ 🛠 wpe ✅ 🛠 win
✅ 🧪 bindings ✅ 🛠 ios-sim ✅ 🛠 mac-AS-debug ✅ 🧪 wpe-wk2 ⏳ 🧪 win-tests
✅ 🧪 webkitperl ✅ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
✅ 🧪 ios-wk2-wpt ✅ 🧪 mac-wk1 ✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc ✅ 🧪 api-ios ✅ 🧪 mac-wk2 ✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64 ✅ 🛠 vision ✅ 🧪 mac-AS-debug-wk2 ✅ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-wk2-stress ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-intel-wk2   🛠 playstation
✅ 🛠 tv ✅ 🛠 mac-safer-cpp ✅ 🛠 jsc-armv7
✅ 🛠 tv-sim ✅ 🧪 jsc-armv7-tests
✅ 🛠 watch
✅ 🛠 watch-sim

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@lilyspiniolas lilyspiniolas lilyspiniolas left review comments

@cdumez cdumez Awaiting requested review from cdumez cdumez is a code owner

@rniwa rniwa Awaiting requested review from rniwa rniwa is a code owner

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