CVE-2023-53866

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ASoC: soc-compress: Reposition and add pcm_mutex<br /> <br /> If panic_on_warn is set and compress stream(DPCM) is started,<br /> then kernel panic occurred because card-&gt;pcm_mutex isn&amp;#39;t held appropriately.<br /> In the following functions, warning were issued at this line<br /> "snd_soc_dpcm_mutex_assert_held".<br /> <br /> static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,<br /> struct snd_soc_pcm_runtime *be, int stream)<br /> {<br /> ...<br /> snd_soc_dpcm_mutex_assert_held(fe);<br /> ...<br /> }<br /> <br /> void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)<br /> {<br /> ...<br /> snd_soc_dpcm_mutex_assert_held(fe);<br /> ...<br /> }<br /> <br /> void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,<br /> int stream, int action)<br /> {<br /> ...<br /> snd_soc_dpcm_mutex_assert_held(rtd);<br /> ...<br /> }<br /> <br /> int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,<br /> int event)<br /> {<br /> ...<br /> snd_soc_dpcm_mutex_assert_held(fe);<br /> ...<br /> }<br /> <br /> These functions are called by soc_compr_set_params_fe, soc_compr_open_fe<br /> and soc_compr_free_fe<br /> without pcm_mutex locking. And this is call stack.<br /> <br /> [ 414.527841][ T2179] pc : dpcm_process_paths+0x5a4/0x750<br /> [ 414.527848][ T2179] lr : dpcm_process_paths+0x37c/0x750<br /> [ 414.527945][ T2179] Call trace:<br /> [ 414.527949][ T2179] dpcm_process_paths+0x5a4/0x750<br /> [ 414.527955][ T2179] soc_compr_open_fe+0xb0/0x2cc<br /> [ 414.527972][ T2179] snd_compr_open+0x180/0x248<br /> [ 414.527981][ T2179] snd_open+0x15c/0x194<br /> [ 414.528003][ T2179] chrdev_open+0x1b0/0x220<br /> [ 414.528023][ T2179] do_dentry_open+0x30c/0x594<br /> [ 414.528045][ T2179] vfs_open+0x34/0x44<br /> [ 414.528053][ T2179] path_openat+0x914/0xb08<br /> [ 414.528062][ T2179] do_filp_open+0xc0/0x170<br /> [ 414.528068][ T2179] do_sys_openat2+0x94/0x18c<br /> [ 414.528076][ T2179] __arm64_sys_openat+0x78/0xa4<br /> [ 414.528084][ T2179] invoke_syscall+0x48/0x10c<br /> [ 414.528094][ T2179] el0_svc_common+0xbc/0x104<br /> [ 414.528099][ T2179] do_el0_svc+0x34/0xd8<br /> [ 414.528103][ T2179] el0_svc+0x34/0xc4<br /> [ 414.528125][ T2179] el0t_64_sync_handler+0x8c/0xfc<br /> [ 414.528133][ T2179] el0t_64_sync+0x1a0/0x1a4<br /> [ 414.528142][ T2179] Kernel panic - not syncing: panic_on_warn set ...<br /> <br /> So, I reposition and add pcm_mutex to resolve lockdep error.