Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 84ea03ded8bb54fd046a1f5c2b2379f308a3f5af
https://github.com/WebKit/WebKit/commit/84ea03ded8bb54fd046a1f5c2b2379f308a3f5af
Author: Roberto Rodriguez <[email protected]>
Date: 2026-08-12 (Wed, 12 Aug 2026)
Changed paths:
A
LayoutTests/imported/w3c/web-platform-tests/content-security-policy/inheritance/about-blank-from-javascript-url-inherits-csp-from-initiator.sub-expected.txt
A
LayoutTests/imported/w3c/web-platform-tests/content-security-policy/inheritance/about-blank-from-javascript-url-inherits-csp-from-initiator.sub.html
A
LayoutTests/imported/w3c/web-platform-tests/content-security-policy/inheritance/support/page-with-csp-marker.html
A
LayoutTests/imported/w3c/web-platform-tests/content-security-policy/inheritance/support/page-with-csp-marker.html.headers
M LayoutTests/platform/ios-site-isolation/TestExpectations
M LayoutTests/platform/mac-site-isolation/TestExpectations
M Source/WebCore/loader/NavigationRequester.cpp
Log Message:
-----------
about:blank inherits cross-origin policy container due to empty document URL
https://bugs.webkit.org/show_bug.cgi?id=316512
rdar://176188073
Reviewed by Alex Christensen.
Documents created via javascript: URL have an empty internal URL.
Document::setURL() would
normally normalize this to aboutBlankURL(), but the call is conditionally
skipped during
document creation.
When one of these documents creates a cross-origin iframe and then navigates it
to about:blank,
the empty URL passes through NavigationRequester into
NavigationAction::isEmpty(), which
mistakes it for an action that was never set. The fallback in
FrameLoader::loadWithDocumentLoader
incorrectly rebuilds the action from the target frame's cross-origin document
rather than the
original initiator (the javascript: URL document). The about:blank then
inherits that document's
policy container instead of the initiator's, leaking its CSP and referrer via
SecurityPolicyViolationEvent.
Fix by normalizing empty document URLs to aboutBlankURL() in
NavigationRequester::from(),
matching what Document::setURL() and Document::urlForBindings() already do.
Tests:
imported/w3c/web-platform-tests/content-security-policy/inheritance/about-blank-from-javascript-url-inherits-csp-from-initiator.sub.html
imported/w3c/web-platform-tests/content-security-policy/inheritance/support/page-with-csp-marker.html
*
LayoutTests/imported/w3c/web-platform-tests/content-security-policy/inheritance/about-blank-from-javascript-url-inherits-csp-from-initiator.sub-expected.txt:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/content-security-policy/inheritance/about-blank-from-javascript-url-inherits-csp-from-initiator.sub.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/content-security-policy/inheritance/support/page-with-csp-marker.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/content-security-policy/inheritance/support/page-with-csp-marker.html.headers:
Added.
* LayoutTests/platform/ios-site-isolation/TestExpectations:
* LayoutTests/platform/mac-site-isolation/TestExpectations:
* Source/WebCore/loader/NavigationRequester.cpp:
(WebCore::NavigationRequester::from):
Originally-landed-as: [email protected] (45512c517789).
rdar://184744543
Canonical link: https://commits.webkit.org/319079@main
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