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Bug 1430173 - Reduce the precision of all explicit clocks to 2ms. r=baku, a=RyanVM

Browse source 
Backport to ESR where we don't have the ResistFingerprinting component.

MozReview-Commit-ID: 9bjycHjR3SF

--HG--
extra : transplant_source : %EA%03%21%0A%E9%3F%8E%CD%7C%D79f%96%85%96%00%5D%7F%95X
This commit is contained in:
Tom Ritter 2018-02-20 12:18:30 -06:00 • committed by Roy Tam
commit c66f2e1613
14 changed files with 109 additions and 33 deletions
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5
dom/performance/Performance.cpp Normal file → Executable file
View file

@ -21,6 +21,7 @@
#include "mozilla/dom/PerformanceObserverBinding.h"
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/Preferences.h"
#include "mozilla/TimerClamping.h"
#include "WorkerPrivate.h"
#include "WorkerRunnable.h"
@ -228,9 +229,9 @@ Performance::ClearResourceTimings()
DOMHighResTimeStamp
Performance::RoundTime(double aTime) const
{
// Round down to the nearest 20us, because if the timer is too accurate people
// Round down to the nearest 2ms, because if the timer is too accurate people
// can do nasty timing attacks with it.
const double maxResolutionMs = 0.020;
const double maxResolutionMs = 2;
return floor(aTime / maxResolutionMs) * maxResolutionMs;
}

22
dom/performance/PerformanceTiming.cpp Normal file → Executable file
View file

@ -21,7 +21,7 @@ PerformanceTiming::PerformanceTiming(Performance* aPerformance,
DOMHighResTimeStamp aZeroTime)
: mPerformance(aPerformance),
mFetchStart(0.0),
mZeroTime(aZeroTime),
mZeroTime(TimerClamping::ReduceMsTimeValue(aZeroTime)),
mRedirectCount(0),
mTimingAllowed(true),
mAllRedirectsSameOrigin(true),
@ -117,7 +117,7 @@ PerformanceTiming::FetchStartHighRes()
? TimeStampToDOMHighRes(mAsyncOpen)
: 0.0;
}
return mFetchStart;
return TimerClamping::ReduceMsTimeValue(mFetchStart);
}
DOMTimeMilliSec
@ -203,7 +203,7 @@ PerformanceTiming::RedirectStartHighRes()
if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
return mZeroTime;
}
return TimeStampToDOMHighResOrFetchStart(mRedirectStart);
return TimeStampToReducedDOMHighResOrFetchStart(mRedirectStart);
}
DOMTimeMilliSec
@ -236,7 +236,7 @@ PerformanceTiming::RedirectEndHighRes()
if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
return mZeroTime;
}
return TimeStampToDOMHighResOrFetchStart(mRedirectEnd);
return TimeStampToReducedDOMHighResOrFetchStart(mRedirectEnd);
}
DOMTimeMilliSec
@ -259,7 +259,7 @@ PerformanceTiming::DomainLookupStartHighRes()
if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
return mZeroTime;
}
return TimeStampToDOMHighResOrFetchStart(mDomainLookupStart);
return TimeStampToReducedDOMHighResOrFetchStart(mDomainLookupStart);
}
DOMTimeMilliSec
@ -276,7 +276,7 @@ PerformanceTiming::DomainLookupEndHighRes()
}
// Bug 1155008 - nsHttpTransaction is racy. Return DomainLookupStart when null
return mDomainLookupEnd.IsNull() ? DomainLookupStartHighRes()
: TimeStampToDOMHighRes(mDomainLookupEnd);
: TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mDomainLookupEnd));
}
DOMTimeMilliSec
@ -292,7 +292,7 @@ PerformanceTiming::ConnectStartHighRes()
return mZeroTime;
}
return mConnectStart.IsNull() ? DomainLookupEndHighRes()
: TimeStampToDOMHighRes(mConnectStart);
: TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mConnectStart));
}
DOMTimeMilliSec
@ -329,7 +329,7 @@ PerformanceTiming::ConnectEndHighRes()
}
// Bug 1155008 - nsHttpTransaction is racy. Return ConnectStart when null
return mConnectEnd.IsNull() ? ConnectStartHighRes()
: TimeStampToDOMHighRes(mConnectEnd);
: TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mConnectEnd));
}
DOMTimeMilliSec
@ -344,7 +344,7 @@ PerformanceTiming::RequestStartHighRes()
if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
return mZeroTime;
}
return TimeStampToDOMHighResOrFetchStart(mRequestStart);
return TimeStampToReducedDOMHighResOrFetchStart(mRequestStart);
}
DOMTimeMilliSec
@ -363,7 +363,7 @@ PerformanceTiming::ResponseStartHighRes()
(!mCacheReadStart.IsNull() && mCacheReadStart < mResponseStart)) {
mResponseStart = mCacheReadStart;
}
return TimeStampToDOMHighResOrFetchStart(mResponseStart);
return TimeStampToReducedDOMHighResOrFetchStart(mResponseStart);
}
DOMTimeMilliSec
@ -384,7 +384,7 @@ PerformanceTiming::ResponseEndHighRes()
}
// Bug 1155008 - nsHttpTransaction is racy. Return ResponseStart when null
return mResponseEnd.IsNull() ? ResponseStartHighRes()
: TimeStampToDOMHighRes(mResponseEnd);
: TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mResponseEnd));
}
DOMTimeMilliSec

25
dom/performance/PerformanceTiming.h Normal file → Executable file
View file

@ -10,6 +10,7 @@
#include "mozilla/Attributes.h"
#include "nsContentUtils.h"
#include "nsDOMNavigationTiming.h"
#include "mozilla/TimerClamping.h"
#include "nsWrapperCache.h"
#include "Performance.h"
@ -68,10 +69,10 @@ public:
* page), if the given TimeStamp is valid. Otherwise, it will return
* the FetchStart timing value.
*/
inline DOMHighResTimeStamp TimeStampToDOMHighResOrFetchStart(TimeStamp aStamp)
inline DOMHighResTimeStamp TimeStampToReducedDOMHighResOrFetchStart(TimeStamp aStamp)
{
return (!aStamp.IsNull())
? TimeStampToDOMHighRes(aStamp)
? TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(aStamp))
: FetchStartHighRes();
}
@ -119,7 +120,7 @@ public:
if (!nsContentUtils::IsPerformanceTimingEnabled()) {
return 0;
}
return GetDOMTiming()->GetNavigationStart();
return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetNavigationStart());
}
DOMTimeMilliSec UnloadEventStart()
@ -127,7 +128,7 @@ public:
if (!nsContentUtils::IsPerformanceTimingEnabled()) {
return 0;
}
return GetDOMTiming()->GetUnloadEventStart();
return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetUnloadEventStart());
}
DOMTimeMilliSec UnloadEventEnd()
@ -135,7 +136,7 @@ public:
if (!nsContentUtils::IsPerformanceTimingEnabled()) {
return 0;
}
return GetDOMTiming()->GetUnloadEventEnd();
return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetUnloadEventEnd());
}
uint16_t GetRedirectCount() const;
@ -185,7 +186,7 @@ public:
if (!nsContentUtils::IsPerformanceTimingEnabled()) {
return 0;
}
return GetDOMTiming()->GetDomLoading();
return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetDomLoading());
}
DOMTimeMilliSec DomInteractive() const
@ -193,7 +194,7 @@ public:
if (!nsContentUtils::IsPerformanceTimingEnabled()) {
return 0;
}
return GetDOMTiming()->GetDomInteractive();
return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetDomInteractive());
}
DOMTimeMilliSec DomContentLoadedEventStart() const
@ -201,7 +202,7 @@ public:
if (!nsContentUtils::IsPerformanceTimingEnabled()) {
return 0;
}
return GetDOMTiming()->GetDomContentLoadedEventStart();
return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetDomContentLoadedEventStart());
}
DOMTimeMilliSec DomContentLoadedEventEnd() const
@ -209,7 +210,7 @@ public:
if (!nsContentUtils::IsPerformanceTimingEnabled()) {
return 0;
}
return GetDOMTiming()->GetDomContentLoadedEventEnd();
return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetDomContentLoadedEventEnd());
}
DOMTimeMilliSec DomComplete() const
@ -217,7 +218,7 @@ public:
if (!nsContentUtils::IsPerformanceTimingEnabled()) {
return 0;
}
return GetDOMTiming()->GetDomComplete();
return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetDomComplete());
}
DOMTimeMilliSec LoadEventStart() const
@ -225,7 +226,7 @@ public:
if (!nsContentUtils::IsPerformanceTimingEnabled()) {
return 0;
}
return GetDOMTiming()->GetLoadEventStart();
return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetLoadEventStart());
}
DOMTimeMilliSec LoadEventEnd() const
@ -233,7 +234,7 @@ public:
if (!nsContentUtils::IsPerformanceTimingEnabled()) {
return 0;
}
return GetDOMTiming()->GetLoadEventEnd();
return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetLoadEventEnd());
}
private: