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Bug 1752907: Cut over Hardware Concurrency to finer-grained RFP Check r=tjr

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Differential Revision: https://phabricator.services.mozilla.com/D137481
This commit is contained in:
asharma 2022-02-07 20:26:28 +00:00
parent f97318414e
commit 9fd77ce12f
4 changed files with 10 additions and 5 deletions
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3
dom/base/Navigator.cpp
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@ -645,7 +645,8 @@ uint64_t Navigator::HardwareConcurrency() {
return 1;
}
return rts->ClampedHardwareConcurrency();
return rts->ClampedHardwareConcurrency(
nsContentUtils::ShouldResistFingerprinting(mWindow->GetExtantDoc()));
}
namespace {

5
dom/workers/RuntimeService.cpp
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@ -1994,11 +1994,12 @@ void RuntimeService::MemoryPressureAllWorkers() {
BroadcastAllWorkers([](auto& worker) { worker.MemoryPressure(); });
}
uint32_t RuntimeService::ClampedHardwareConcurrency() const {
uint32_t RuntimeService::ClampedHardwareConcurrency(
bool aShouldResistFingerprinting) const {
// The Firefox Hardware Report says 70% of Firefox users have exactly 2 cores.
// When the resistFingerprinting pref is set, we want to blend into the crowd
// so spoof navigator.hardwareConcurrency = 2 to reduce user uniqueness.
if (MOZ_UNLIKELY(nsContentUtils::ShouldResistFingerprinting())) {
if (MOZ_UNLIKELY(aShouldResistFingerprinting)) {
return 2;
}

2
dom/workers/RuntimeService.h
View File

@ -178,7 +178,7 @@ class RuntimeService final : public nsIObserver {
void MemoryPressureAllWorkers();
uint32_t ClampedHardwareConcurrency() const;
uint32_t ClampedHardwareConcurrency(bool aShouldResistFingerprinting) const;
void CrashIfHanging();

5
dom/workers/WorkerNavigator.cpp
View File

@ -176,7 +176,10 @@ uint64_t WorkerNavigator::HardwareConcurrency() const {
RuntimeService* rts = RuntimeService::GetService();
MOZ_ASSERT(rts);
return rts->ClampedHardwareConcurrency();
WorkerPrivate* aWorkerPrivate = GetCurrentThreadWorkerPrivate();
bool rfp = aWorkerPrivate->ShouldResistFingerprinting();
return rts->ClampedHardwareConcurrency(rfp);
}
StorageManager* WorkerNavigator::Storage() {