[Webkit-unassigned] [Bug 216407] New: Safely handle overly-long CSS variable values

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216407

            Bug ID: 216407
           Summary: Safely handle overly-long CSS variable values
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: twilco.o at protonmail.com

Safely handle and reject long CSS variable values to prevent unbounded memory consumption.

https://drafts.csswg.org/css-variables/#long-variables

>From the spec:

.foo {
  --prop1: lol;
  --prop2: var(--prop1) var(--prop1);
  --prop3: var(--prop2) var(--prop2);
  --prop4: var(--prop3) var(--prop3);
  /* expand to --prop30 */
}

Results in --prop30 containing ~1 billion instances of this identifier.

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