Excerpts from Takashi Iwai's message of June 9, 2020 11:12 am: > On Tue, 09 Jun 2020 13:47:33 +0200, > Christoph Hellwig wrote: >> >> Alex, can you try this patch? > > Also could you check whether just papering over the memset() call > alone avoids the crash like below? For PulseAudio and dmix/dsnoop, > it's the only code path that accesses the vmapped buffer, I believe. > > If this works more or less, I'll cook a more comprehensive fix. > > > thanks, > > Takashi > > --- a/sound/core/pcm_native.c > +++ b/sound/core/pcm_native.c > @@ -754,9 +754,11 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream, > while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) > runtime->boundary *= 2; > > +#if 0 > /* clear the buffer for avoiding possible kernel info leaks */ > if (runtime->dma_area && !substream->ops->copy_user) > memset(runtime->dma_area, 0, runtime->dma_bytes); > +#endif > > snd_pcm_timer_resolution_change(substream); > snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); > Sorry, this patch doesn't work for me with SME off using abfbb29297c2. David's newest submitted patch works for me, which I already replied to separately. Thanks, Alex.
