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Groups > linux.kernel > #1344048
| From | Luis Henriques <luis.henriques@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.16.y-ckt 108/129] ALSA: dummy: Implement timer backend switching more safely |
| Date | 2016-02-26 11:40 +0100 |
| Message-ID | <r6nYu-1Np-27@gated-at.bofh.it> (permalink) |
| References | <r6nOO-1Jb-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.16.7-ckt25 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Takashi Iwai <tiwai@suse.de>
commit ddce57a6f0a2d8d1bfacfa77f06043bc760403c2 upstream.
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 [7ee96216c31a: 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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
sound/drivers/dummy.c | 37 +++++++++++++++++++------------------
1 file changed, 19 insertions(+), 18 deletions(-)
diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c
index 1e29a1983791..387bb8f603ac 100644
--- a/sound/drivers/dummy.c
+++ b/sound/drivers/dummy.c
@@ -87,7 +87,7 @@ MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
module_param(fake_buffer, bool, 0444);
MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations.");
#ifdef CONFIG_HIGH_RES_TIMERS
-module_param(hrtimer, bool, 0444);
+module_param(hrtimer, bool, 0644);
MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
#endif
@@ -109,6 +109,9 @@ struct dummy_timer_ops {
snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
};
+#define get_dummy_ops(substream) \
+ (*(const struct dummy_timer_ops **)(substream)->runtime->private_data)
+
struct dummy_model {
const char *name;
int (*playback_constraints)(struct snd_pcm_runtime *runtime);
@@ -137,7 +140,6 @@ struct snd_dummy {
int iobox;
struct snd_kcontrol *cd_volume_ctl;
struct snd_kcontrol *cd_switch_ctl;
- const struct dummy_timer_ops *timer_ops;
};
/*
@@ -231,6 +233,8 @@ struct dummy_model *dummy_models[] = {
*/
struct dummy_systimer_pcm {
+ /* ops must be the first item */
+ const struct dummy_timer_ops *timer_ops;
spinlock_t lock;
struct timer_list timer;
unsigned long base_time;
@@ -368,6 +372,8 @@ static struct dummy_timer_ops dummy_systimer_ops = {
*/
struct dummy_hrtimer_pcm {
+ /* ops must be the first item */
+ const struct dummy_timer_ops *timer_ops;
ktime_t base_time;
ktime_t period_time;
atomic_t running;
@@ -494,31 +500,25 @@ static struct dummy_timer_ops dummy_hrtimer_ops = {
static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
- struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
-
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
- return dummy->timer_ops->start(substream);
+ return get_dummy_ops(substream)->start(substream);
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
- return dummy->timer_ops->stop(substream);
+ return get_dummy_ops(substream)->stop(substream);
}
return -EINVAL;
}
static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
{
- struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
-
- return dummy->timer_ops->prepare(substream);
+ return get_dummy_ops(substream)->prepare(substream);
}
static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
{
- struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
-
- return dummy->timer_ops->pointer(substream);
+ return get_dummy_ops(substream)->pointer(substream);
}
static struct snd_pcm_hardware dummy_pcm_hardware = {
@@ -564,17 +564,19 @@ static int dummy_pcm_open(struct snd_pcm_substream *substream)
struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
struct dummy_model *model = dummy->model;
struct snd_pcm_runtime *runtime = substream->runtime;
+ const struct dummy_timer_ops *ops;
int err;
- dummy->timer_ops = &dummy_systimer_ops;
+ ops = &dummy_systimer_ops;
#ifdef CONFIG_HIGH_RES_TIMERS
if (hrtimer)
- dummy->timer_ops = &dummy_hrtimer_ops;
+ ops = &dummy_hrtimer_ops;
#endif
- err = dummy->timer_ops->create(substream);
+ err = ops->create(substream);
if (err < 0)
return err;
+ get_dummy_ops(substream) = ops;
runtime->hw = dummy->pcm_hw;
if (substream->pcm->device & 1) {
@@ -596,7 +598,7 @@ static int dummy_pcm_open(struct snd_pcm_substream *substream)
err = model->capture_constraints(substream->runtime);
}
if (err < 0) {
- dummy->timer_ops->free(substream);
+ get_dummy_ops(substream)->free(substream);
return err;
}
return 0;
@@ -604,8 +606,7 @@ static int dummy_pcm_open(struct snd_pcm_substream *substream)
static int dummy_pcm_close(struct snd_pcm_substream *substream)
{
- struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
- dummy->timer_ops->free(substream);
+ get_dummy_ops(substream)->free(substream);
return 0;
}
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2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 009/129] EVM: Use crypto_memneq() for digest comparisons Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 023/129] ALSA: seq: Degrade the error message for too many opens Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 040/129] powerpc/perf: Remove PPMU_HAS_SSLOT flag for Power8 Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 008/129] iw_cxgb3: Fix incorrectly returning error on success Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 028/129] virtio_pci: fix use after free on release Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 030/129] arm64: errata: Add -mpc-relative-literal-loads to build flags Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 010/129] ALSA: usb-audio: avoid freeing umidi object twice Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 029/129] ALSA: bebob: Use a signed return type for get_formation_index Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 015/129] usb: cdc-acm: handle unlinked urb in acm read callback Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 017/129] cdc-acm:exclude Samsung phone 04e8:685d Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 035/129] ALSA: dummy: Disable switching timer backend via sysfs Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 025/129] USB: option: fix Cinterion AHxx enumeration Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 021/129] USB: serial: option: Adding support for Telit LE922 Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 016/129] usb: cdc-acm: send zero packet for intel 7260 modem Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 034/129] staging/speakup: Use tty_ldisc_ref() for paste kworker Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 038/129] perf annotate browser: Fix behaviour of Shift-Tab with nothing focussed Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:10 +0100 [PATCH 3.16.y-ckt 005/129] USB: serial: visor: fix crash on detecting device without write_urbs Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100 [PATCH 3.16.y-ckt 007/129] qeth: initialize net_device with carrier off Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100 [PATCH 3.16.y-ckt 011/129] iio: adis_buffer: Fix out-of-bounds memory access Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100 [PATCH 3.16.y-ckt 002/129] [media] usbvision: fix leak of usb_dev on failure paths in usbvision_probe() Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100 [PATCH 3.16.y-ckt 003/129] [media] usbvision: fix crash on detecting device with invalid configuration Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100 [PATCH 3.16.y-ckt 004/129] tty: Fix unsafe ldisc reference via ioctl(TIOCGETD) Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100 [PATCH 3.16.y-ckt 006/129] ASN.1: Fix non-match detection failure on data overrun Luis Henriques <luis.henriques@canonical.com> - 2016-02-26 12:20 +0100 [PATCH 3.16.y-ckt 131/131] net: phy: Avoid polling PHY with PHY_IGNORE_INTERRUPTS Luis Henriques <luis.henriques@canonical.com> - 2016-02-29 12:40 +0100 [PATCH 3.16.y-ckt 130/131] net: phy: fix PHY_RUNNING in phy_state_machine Luis Henriques <luis.henriques@canonical.com> - 2016-02-29 12:40 +0100
csiph-web