[PATCH 4.19 208/239] ASoC: dpcm: prevent snd_soc_dpcm use after free
From: Greg Kroah-Hartman
Date: Mon Jan 24 2022 - 15:07:43 EST
From: KaiChieh Chuang <kaichieh.chuang@xxxxxxxxxxxx>
commit a9764869779081e8bf24da07ac040e8f3efcf13a upstream.
The dpcm get from fe_clients/be_clients
may be free before use
Add a spin lock at snd_soc_card level,
to protect the dpcm instance.
The lock may be used in atomic context, so use spin lock.
Use irq spin lock version,
since the lock may be used in interrupts.
possible race condition between
void dpcm_be_disconnect(
...
list_del(&dpcm->list_be);
list_del(&dpcm->list_fe);
kfree(dpcm);
...
and
for_each_dpcm_fe()
for_each_dpcm_be*()
race condition example
Thread 1:
snd_soc_dapm_mixer_update_power()
-> soc_dpcm_runtime_update()
-> dpcm_be_disconnect()
-> kfree(dpcm);
Thread 2:
dpcm_fe_dai_trigger()
-> dpcm_be_dai_trigger()
-> snd_soc_dpcm_can_be_free_stop()
-> if (dpcm->fe == fe)
Excpetion Scenario:
two FE link to same BE
FE1 -> BE
FE2 ->
Thread 1: switch of mixer between FE2 -> BE
Thread 2: pcm_stop FE1
Exception:
Unable to handle kernel paging request at virtual address dead0000000000e0
pc=<> [<ffffff8960e2cd10>] dpcm_be_dai_trigger+0x29c/0x47c
sound/soc/soc-pcm.c:3226
if (dpcm->fe == fe)
lr=<> [<ffffff8960e2f694>] dpcm_fe_dai_do_trigger+0x94/0x26c
Backtrace:
[<ffffff89602dba80>] notify_die+0x68/0xb8
[<ffffff896028c7dc>] die+0x118/0x2a8
[<ffffff89602a2f84>] __do_kernel_fault+0x13c/0x14c
[<ffffff89602a27f4>] do_translation_fault+0x64/0xa0
[<ffffff8960280cf8>] do_mem_abort+0x4c/0xd0
[<ffffff8960282ad0>] el1_da+0x24/0x40
[<ffffff8960e2cd10>] dpcm_be_dai_trigger+0x29c/0x47c
[<ffffff8960e2f694>] dpcm_fe_dai_do_trigger+0x94/0x26c
[<ffffff8960e2edec>] dpcm_fe_dai_trigger+0x3c/0x44
[<ffffff8960de5588>] snd_pcm_do_stop+0x50/0x5c
[<ffffff8960dded24>] snd_pcm_action+0xb4/0x13c
[<ffffff8960ddfdb4>] snd_pcm_drop+0xa0/0x128
[<ffffff8960de69bc>] snd_pcm_common_ioctl+0x9d8/0x30f0
[<ffffff8960de1cac>] snd_pcm_ioctl_compat+0x29c/0x2f14
[<ffffff89604c9d60>] compat_SyS_ioctl+0x128/0x244
[<ffffff8960283740>] el0_svc_naked+0x34/0x38
[<ffffffffffffffff>] 0xffffffffffffffff
Signed-off-by: KaiChieh Chuang <kaichieh.chuang@xxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
[willmcvicker: move spinlock to bottom of struct snd_soc_card]
Signed-off-by: Will McVicker <willmcvicker@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 4.19+
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/sound/soc.h | 2 ++
sound/soc/soc-core.c | 1 +
sound/soc/soc-pcm.c | 40 +++++++++++++++++++++++++++++++++-------
3 files changed, 36 insertions(+), 7 deletions(-)
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1113,6 +1113,8 @@ struct snd_soc_card {
u32 pop_time;
void *drvdata;
+
+ spinlock_t dpcm_lock;
};
/* SoC machine DAI configuration, glues a codec and cpu DAI together */
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -2752,6 +2752,7 @@ int snd_soc_register_card(struct snd_soc
card->instantiated = 0;
mutex_init(&card->mutex);
mutex_init(&card->dapm_mutex);
+ spin_lock_init(&card->dpcm_lock);
ret = snd_soc_instantiate_card(card);
if (ret != 0)
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -1221,6 +1221,7 @@ static int dpcm_be_connect(struct snd_so
struct snd_soc_pcm_runtime *be, int stream)
{
struct snd_soc_dpcm *dpcm;
+ unsigned long flags;
/* only add new dpcms */
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
@@ -1236,8 +1237,10 @@ static int dpcm_be_connect(struct snd_so
dpcm->fe = fe;
be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
+ spin_lock_irqsave(&fe->card->dpcm_lock, flags);
list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
+ spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
stream ? "capture" : "playback", fe->dai_link->name,
@@ -1283,6 +1286,7 @@ static void dpcm_be_reparent(struct snd_
void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm, *d;
+ unsigned long flags;
list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
@@ -1302,8 +1306,10 @@ void dpcm_be_disconnect(struct snd_soc_p
#ifdef CONFIG_DEBUG_FS
debugfs_remove(dpcm->debugfs_state);
#endif
+ spin_lock_irqsave(&fe->card->dpcm_lock, flags);
list_del(&dpcm->list_be);
list_del(&dpcm->list_fe);
+ spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
kfree(dpcm);
}
}
@@ -1557,10 +1563,13 @@ int dpcm_process_paths(struct snd_soc_pc
void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm;
+ unsigned long flags;
+ spin_lock_irqsave(&fe->card->dpcm_lock, flags);
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
dpcm->be->dpcm[stream].runtime_update =
SND_SOC_DPCM_UPDATE_NO;
+ spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
}
static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
@@ -2626,6 +2635,7 @@ static int dpcm_run_update_startup(struc
struct snd_soc_dpcm *dpcm;
enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
int ret;
+ unsigned long flags;
dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
stream ? "capture" : "playback", fe->dai_link->name);
@@ -2695,11 +2705,13 @@ close:
dpcm_be_dai_shutdown(fe, stream);
disconnect:
/* disconnect any non started BEs */
+ spin_lock_irqsave(&fe->card->dpcm_lock, flags);
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
struct snd_soc_pcm_runtime *be = dpcm->be;
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
}
+ spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
return ret;
}
@@ -3278,7 +3290,10 @@ int snd_soc_dpcm_can_be_free_stop(struct
{
struct snd_soc_dpcm *dpcm;
int state;
+ int ret = 1;
+ unsigned long flags;
+ spin_lock_irqsave(&fe->card->dpcm_lock, flags);
list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
if (dpcm->fe == fe)
@@ -3287,12 +3302,15 @@ int snd_soc_dpcm_can_be_free_stop(struct
state = dpcm->fe->dpcm[stream].state;
if (state == SND_SOC_DPCM_STATE_START ||
state == SND_SOC_DPCM_STATE_PAUSED ||
- state == SND_SOC_DPCM_STATE_SUSPEND)
- return 0;
+ state == SND_SOC_DPCM_STATE_SUSPEND) {
+ ret = 0;
+ break;
+ }
}
+ spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
/* it's safe to free/stop this BE DAI */
- return 1;
+ return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
@@ -3305,7 +3323,10 @@ int snd_soc_dpcm_can_be_params(struct sn
{
struct snd_soc_dpcm *dpcm;
int state;
+ int ret = 1;
+ unsigned long flags;
+ spin_lock_irqsave(&fe->card->dpcm_lock, flags);
list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
if (dpcm->fe == fe)
@@ -3315,12 +3336,15 @@ int snd_soc_dpcm_can_be_params(struct sn
if (state == SND_SOC_DPCM_STATE_START ||
state == SND_SOC_DPCM_STATE_PAUSED ||
state == SND_SOC_DPCM_STATE_SUSPEND ||
- state == SND_SOC_DPCM_STATE_PREPARE)
- return 0;
+ state == SND_SOC_DPCM_STATE_PREPARE) {
+ ret = 0;
+ break;
+ }
}
+ spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
/* it's safe to change hw_params */
- return 1;
+ return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
@@ -3359,6 +3383,7 @@ static ssize_t dpcm_show_state(struct sn
struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
struct snd_soc_dpcm *dpcm;
ssize_t offset = 0;
+ unsigned long flags;
/* FE state */
offset += scnprintf(buf + offset, size - offset,
@@ -3386,6 +3411,7 @@ static ssize_t dpcm_show_state(struct sn
goto out;
}
+ spin_lock_irqsave(&fe->card->dpcm_lock, flags);
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
struct snd_soc_pcm_runtime *be = dpcm->be;
params = &dpcm->hw_params;
@@ -3406,7 +3432,7 @@ static ssize_t dpcm_show_state(struct sn
params_channels(params),
params_rate(params));
}
-
+ spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
out:
return offset;
}