CVE-2023-53866 in Linux
Resumen
por VulDB • 2026-05-14
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:
ASoC: soc-compress: Reubicar y añadir pcm_mutex
Si panic_on_warn está configurado y se inicia el flujo de compresión (DPCM), se produce un kernel panic porque card->pcm_mutex no se mantiene adecuadamente. En las siguientes funciones, se emiten advertencias en esta línea: "snd_soc_dpcm_mutex_assert_held".
```c static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe, struct snd_soc_pcm_runtime *be, int stream) {
... snd_soc_dpcm_mutex_assert_held(fe); ... }
void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream) {
... snd_soc_dpcm_mutex_assert_held(fe); ... }
void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd, int stream, int action) {
... snd_soc_dpcm_mutex_assert_held(rtd); ... }
int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir, int event) {
... snd_soc_dpcm_mutex_assert_held(fe); ... } ```
Estas funciones son llamadas por soc_compr_set_params_fe, soc_compr_open_fe y soc_compr_free_fe sin el bloqueo de pcm_mutex. Y esta es la pila de llamadas:
``` [ 414.527841][ T2179] pc : dpcm_process_paths+0x5a4/0x750
[ 414.527848][ T2179] lr : dpcm_process_paths+0x37c/0x750
[ 414.527945][ T2179] Call trace:
[ 414.527949][ T2179] dpcm_process_paths+0x5a4/0x750
[ 414.527955][ T2179] soc_compr_open_fe+0xb0/0x2cc
[ 414.527972][ T2179] snd_compr_open+0x180/0x248
[ 414.527981][ T2179] snd_open+0x15c/0x194
[ 414.528003][ T2179] chrdev_open+0x1b0/0x220
[ 414.528023][ T2179] do_dentry_open+0x30c/0x594
[ 414.528033][ T2179] vfs_open+0x34/0x5c
[ 414.528040][ T2179] do_open+0x230/0x3e0
[ 414.528050][ T2179] do_filp_open+0xc0/0x170
[ 414.528068][ T2179] do_sys_openat2+0x94/0x18c
[ 414.528076][ T2179] __arm64_sys_openat+0x78/0xa4
[ 414.528084][ T2179] invoke_syscall+0x48/0x10c
[ 414.528094][ T2179] el0_svc_common+0xbc/0x104
[ 414.528099][ T2179] do_el0_svc+0x34/0xd8
[ 414.528103][ T2179] el0_svc+0x34/0xc4
[ 414.528125][ T2179] el0t_64_sync_handler+0x8c/0xfc
[ 414.528133][ T2179] el0t_64_sync+0x1a0/0x1a4
[ 414.528142][ T2179] Kernel panic - not syncing: panic_on_warn set ...
```
Por lo tanto, se reubica y añade pcm_mutex para resolver el error de lockdep.
Fixes: 043444344344 ("ASoC: soc-compress: Add DPCM support for compress") Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
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