ALSA: pcm: Make mmap status read-only
authorTakashi Iwai <tiwai@suse.de>
Mon, 26 Sep 2022 13:55:49 +0000 (15:55 +0200)
committerTakashi Iwai <tiwai@suse.de>
Tue, 27 Sep 2022 06:46:03 +0000 (08:46 +0200)
commit1be2143fb7b19e247f7c4aa1097f85fe92c132bf
tree8bc9710c8bed62d1015e1f375d74d6fb421dbb60
parentf0061c18c169f0c32d96b59485c3edee85e343ed
ALSA: pcm: Make mmap status read-only

The mmap status record should be read-only.  Modifying it from
user-space may screw up things unexpectedly, so let's clear the write
bits at exposing it.

Note that alsa-lib and other known user-space apps access the mmapped
status only as read-only, hence this change shouldn't break the
existing applications.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20220926135558.26580-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/core/pcm_native.c