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Avoid crash when non-trusted-script object is passed into Function constructor (#39451)

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It is possible to pass in objects that are not trusted scripts into the
Function constructor. Rather than crashing, we now treat these as
untrusted. `can_compile_string_with_trusted_type` doesn't need to know
the contents of a string, as it always marks it as untrusted.

We can make the same optimization in the string case, where we no longer
need to convert the string.

Testing: This change adds a WPT crash test.
Fixes #39436

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>
This commit is contained in:
Tim van der Lippe 2025-09-26 20:33:56 +02:00 • committed by GitHub
parent d29ad5b9c3
commit b38bf3e606
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3 changed files with 34 additions and 4 deletions
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11
components/script/script_runtime.rs
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@ -552,13 +552,16 @@ unsafe extern "C" fn content_security_policy_allows(
parameter_args_vec
.push(TrustedScriptOrString::TrustedScript(trusted_script));
} else {
unreachable!();
// It's not a trusted script but a different object. Treat it
// as if it is a string, since we don't need the actual contents
// of the object.
parameter_args_vec
.push(TrustedScriptOrString::String(DOMString::new()));
}
} else if value.is_string() {
let string_ptr = std::ptr::NonNull::new(value.to_string()).unwrap();
let dom_string = unsafe { jsstr_to_string(*cx, string_ptr) };
// We don't need to know the specific string, only that it is untrusted
parameter_args_vec
.push(TrustedScriptOrString::String(dom_string.into()));
.push(TrustedScriptOrString::String(DOMString::new()));
} else {
unreachable!();
}