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linux/sound/drivers
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Takashi Iwai ddce57a6f0 ALSA: dummy: Implement timer backend switching more safely 
Currently the selected timer backend is referred at any moment from
the running PCM callbacks.  When the backend is switched, it's
possible to lead to inconsistency from the running backend.  This was
pointed by syzkaller fuzzer, and the commit [7ee96216c3: ALSA:
dummy: Disable switching timer backend via sysfs] disabled the dynamic
switching for avoiding the crash.

This patch improves the handling of timer backend switching.  It keeps
the reference to the selected backend during the whole operation of an
opened stream so that it won't be changed by other streams.

Together with this change, the hrtimer parameter is reenabled as
writable now.

NOTE: this patch also turned out to fix the still remaining race.
Namely, ops was still replaced dynamically at dummy_pcm_open:

  static int dummy_pcm_open(struct snd_pcm_substream *substream)
  {
  ....
          dummy->timer_ops = &dummy_systimer_ops;
          if (hrtimer)
                  dummy->timer_ops = &dummy_hrtimer_ops;

Since dummy->timer_ops is common among all streams, and when the
replacement happens during accesses of other streams, it may lead to a
crash.  This was actually triggered by syzkaller fuzzer and KASAN.

This patch rewrites the code not to use the ops shared by all streams
any longer, too.

BugLink: http://lkml.kernel.org/r/CACT4Y+aZ+xisrpuM6cOXbL21DuM0yVxPYXf4cD4Md9uw0C3dBQ@mail.gmail.com
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-02-08 08:15:35 +01:00
..
mpu401 ALSA: Include linux/io.h instead of asm/io.h 2015-01-28 16:49:33 +01:00
opl3 Merge branch 'for-linus' into for-next 2015-03-09 08:42:00 +01:00
opl4 ALSA: opl4: Fix / cleanup ifdef CONFIG_PROC_FS 2015-05-29 07:49:55 +02:00
pcsp ALSA: drivers: pcsp: Fix printout of resolution 2015-05-12 09:14:51 +02:00
vx ALSA: Include linux/io.h instead of asm/io.h 2015-01-28 16:49:33 +01:00
aloop.c ALSA: aloop: Drop unnecessary ifdef CONFIG_PROC_FS 2015-05-29 07:46:05 +02:00
dummy.c ALSA: dummy: Implement timer backend switching more safely 2016-02-08 08:15:35 +01:00
Kconfig
Makefile
ml403-ac97cr.c ALSA: Deletion of checks before the function call "iounmap" 2015-01-04 15:13:45 +01:00
mtpav.c ALSA: mtpav: Use setup_timer() and mod_timer() 2015-01-19 11:32:10 +01:00
mts64.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
pcm-indirect2.c treewide: Fix typos in printk 2015-12-08 14:59:19 +01:00
pcm-indirect2.h
portman2x4.c
serial-u16550.c ALSA: Include linux/io.h instead of asm/io.h 2015-01-28 16:49:33 +01:00
virmidi.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00