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Update TimeRollbackPrevention unit test

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Merge from Widevine repo of http://go/wvgerrit/100110

The unit test TimeRollbackPrevention was broken for several
reasons. This CL reduces the test to its most basic functionality and
updates it to be compatible with a v16 oemcrypto.

This CL also adjusts the fake clock used by the buildbot to fake
sleeping backwards, so that the TimeRollbackPrevention test can also
be run on the buildbot.

Bug: 155773482
Bug: 79422351
Test: unit tests on buildbot, and on flame w/v16 modmock
Change-Id: I3027018b17b738281989e63ae6b0729757217d05
This commit is contained in:
Fred Gylys-Colwell
2020-05-15 14:13:20 -07:00
parent 760bf71908
commit 75575418d0
6 changed files with 240 additions and 205 deletions
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32
libwvdrmengine/cdm/util/test/test_sleep.h
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@@ -22,8 +22,9 @@ class TestSleep {
virtual ~CallBack(){};
};
// If real_sleep_ is true, then this sleeps for |seconds| of time.
// If the callback exists, this calls the callback.
// If real_sleep_ is true, then this sleeps for |seconds| of time. If
// real_sleep_ is false, then the fake clock is advanced by |seconds|. If the
// callback exists, this calls the callback.
static void Sleep(unsigned int seconds);
// If we are using a real clock and a fake clock, then the real clock advances
@@ -33,8 +34,30 @@ class TestSleep {
// failing due to this drift.
static void SyncFakeClock();
static void set_real_sleep(bool real_sleep) { real_sleep_ = real_sleep; }
// Roll the system clock back by |seconds|. Returns true on success. A well
// mannered test will call CanChangeSystemTime before attempting to call this
// function and then assert that this is true. This function should *NOT* roll
// back the clock used by OEMCrypto -- in fact, there are several tests that
// verify this function does not roll back the clock used by OEMCrypto.
static bool RollbackSystemTime(int seconds);
// Roll the system clock forward to undo all previous calls to
// RollBackSystemTime. Returns true on success.
static bool ResetRollback() {
return total_clock_rollback_ == 0 ||
RollbackSystemTime(-total_clock_rollback_);
}
// Returns true if the system time can be rolled back. This is true on some
// devices if the tests are run as root. It is also true when using a fake
// clock with the reference version of OEMCrypto. This function is about the
// system clock, *NOT* the clock used by OEMCrypto.
static bool CanChangeSystemTime();
static void set_real_sleep(bool real_sleep) { real_sleep_ = real_sleep; }
static bool real_sleep() { return real_sleep_; }
// The callback is notified whenever sleep is called.
static void set_callback(CallBack* callback) { callback_ = callback; }
private:
@@ -42,6 +65,9 @@ class TestSleep {
static bool real_sleep_;
// Called when the clock should advance.
static CallBack* callback_;
// The sum of all calls to RollBackSystemTime. Kept so we can undo all changes
// at the end of a test.
static int total_clock_rollback_;
};
} // namespace wvcdm