ALSA: pcm: Avoid possible info leaks from PCM stream buffers

commit add9d56d7b3781532208afbff5509d7382fb6efe upstream.

The current PCM code doesn't initialize explicitly the buffers
allocated for PCM streams, hence it might leak some uninitialized
kernel data or previous stream contents by mmapping or reading the
buffer before actually starting the stream.

Since this is a common problem, this patch simply adds the clearance
of the buffer data at hw_params callback.  Although this does only
zero-clear no matter which format is used, which doesn't mean the
silence for some formats, but it should be OK because the intention is
just to clear the previous data on the buffer.

Reported-by: Lionel Koenig <lionel.koenig@gmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191211155742.3213-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index e08c6c6ca0292d11a5661f8baebe61cead24f197..f03ceaff75b54f78da599e079ba35dabd2e3b61b 100644 (file)
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -752,6 +752,10 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
        while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
                runtime->boundary *= 2;
 
+       /* 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);
+
        snd_pcm_timer_resolution_change(substream);
        snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);