[Webkit-unassigned] [Bug 182924] Potential privacy issue: DNS prefetching can be re-enabled

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Feb 23 11:32:13 PST 2018


--- Comment #15 from Michael Catanzaro <mcatanzaro at igalia.com> ---
Just don't get rid of the && !m_haveExplicitlyDisabledDNSPrefetch check:

void Document::parseDNSPrefetchControlHeader(const String& dnsPrefetchControl)
    // Prefetch disabled in settings
    if (!settings().dnsPrefetchingEnabled())

    // Prefetch requested by website *AND not previously turned off by website*
    if (equalLettersIgnoringASCIICase(dnsPrefetchControl, "on") && !m_haveExplicitlyDisabledDNSPrefetch) {
        m_isDNSPrefetchEnabled = true;

    // Prefetch turned off by website (any value for the header except "on")
    m_isDNSPrefetchEnabled = false;
    m_haveExplicitlyDisabledDNSPrefetch = true;

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