linux-toradex.git/include/linux/time.h, branch v4.6-rc6

time: Verify time values in adjtimex ADJ_SETOFFSET to avoid overflow

2015-12-11T06:41:06+00:00

For adjtimex()'s ADJ_SETOFFSET, make sure the tv_usec value is
sane. We might multiply them later which can cause an overflow
and undefined behavior.

This patch introduces new helper functions to simplify the
checking code and adds comments to clarify

Orginally this patch was by Sasha Levin, but I've basically
rewritten it, so he should get credit for finding the issue
and I should get the blame for any mistakes made since.

Also, credit to Richard Cochran for the phrasing used in the
comment for what is considered valid here.

Cc: Sasha Levin 
Cc: Richard Cochran 
Cc: Thomas Gleixner 
Reported-by: Sasha Levin 
Signed-off-by: John Stultz

Merge branch 'fortglx/3.19-stable/time' of https://git.linaro.org/people/john.stultz/linux into timers/urgent

2015-01-22T11:28:02+00:00

Pull urgent fixes from John Stultz:

  Two urgent fixes for user triggerable time related overflow issues

time: settimeofday: Validate the values of tv from user

2015-01-07T17:49:14+00:00

An unvalidated user input is multiplied by a constant, which can result in
an undefined behaviour for large values. While this is validated later,
we should avoid triggering undefined behaviour.

Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: stable 
Signed-off-by: Sasha Levin 
[jstultz: include trivial milisecond->microsecond correction noticed
by Andy]
Signed-off-by: John Stultz

time: Provide y2038 safe mktime() replacement

2014-11-21T19:59:58+00:00

As part of addressing "y2038 problem" for in-kernel uses, this
patch adds safe mktime64() using time64_t.

After this patch, mktime() is deprecated and all its call sites
will be fixed using mktime64(), after that it can be removed.

Signed-off-by: pang.xunlei 
Signed-off-by: John Stultz

time: Consolidate the time accessor prototypes

2014-07-23T17:17:54+00:00

Right now we have time related prototypes in 3 different header
files. Move it to a single timekeeping header file and move the core
internal stuff into a core private header.

Signed-off-by: Thomas Gleixner 
Signed-off-by: John Stultz

time64: Add time64.h header and define struct timespec64

2014-07-23T17:17:53+00:00

Define the timespec64 structure and standard helper functions.

[ tglx: Make it 32bit only. 64bit really can map timespec to timespec64 ]

Signed-off-by: John Stultz 
Signed-off-by: Thomas Gleixner 
Signed-off-by: John Stultz

ktime: Kill non-scalar ktime_t implementation for 2038

2014-07-23T17:16:50+00:00

The non-scalar ktime_t implementation is basically a timespec
which has to be changed to support dates past 2038 on 32bit
systems.

This patch removes the non-scalar ktime_t implementation, forcing
the scalar s64 nanosecond version on all architectures.

This may have additional performance overhead on some 32bit
systems when converting between ktime_t and timespec structures,
however the majority of 32bit systems (arm and i386) were already
using scalar ktime_t, so no performance regressions will be seen
on those platforms.

On affected platforms, I'm open to finding optimizations, including
avoiding converting to timespecs where possible.

[ tglx: We can now cleanup the ktime_t.tv64 mess, but thats a
  different issue and we can throw a coccinelle script at it ]

Signed-off-by: John Stultz 
Signed-off-by: Thomas Gleixner 
Signed-off-by: John Stultz

hrtimer: Cleanup hrtimer accessors to the timekepeing state

2014-07-23T17:16:50+00:00

Rather then having two similar but totally different implementations
that provide timekeeping state to the hrtimer code, try to unify the
two implementations to be more simliar.

Thus this clarifies ktime_get_update_offsets to
ktime_get_update_offsets_now and changes get_xtime...  to
ktime_get_update_offsets_tick.

Signed-off-by: John Stultz 
Signed-off-by: Thomas Gleixner 
Signed-off-by: John Stultz

time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time optimizaitons

2013-05-14T18:54:06+00:00

Kay Sievers noted that the ALWAYS_USE_PERSISTENT_CLOCK config,
which enables some minor compile time optimization to avoid
uncessary code in mostly the suspend/resume path could cause
problems for userland.

In particular, the dependency for RTC_HCTOSYS on
!ALWAYS_USE_PERSISTENT_CLOCK, which avoids setting the time
twice and simplifies suspend/resume, has the side effect
of causing the /sys/class/rtc/rtcN/hctosys flag to always be
zero, and this flag is commonly used by udev to setup the
/dev/rtc symlink to /dev/rtcN, which can cause pain for
older applications.

While the udev rules could use some work to be less fragile,
breaking userland should strongly be avoided. Additionally
the compile time optimizations are fairly minor, and the code
being optimized is likely to be reworked in the future, so
lets revert this change.

Reported-by: Kay Sievers 
Signed-off-by: John Stultz 
Cc: stable  #3.9
Cc: Feng Tang 
Cc: Jason Gunthorpe 
Link: http://lkml.kernel.org/r/1366828376-18124-1-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner

timekeeping: Add CLOCK_TAI clockid

2013-03-22T23:19:59+00:00

This add a CLOCK_TAI clockid and the needed accessors.

CC: Thomas Gleixner 
CC: Eric Dumazet 
CC: Richard Cochran 
Signed-off-by: John Stultz