[PATCH 02/11] 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.

Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/core/pcm_native.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index d9485b1ab719..33769ca78cc8 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -3668,6 +3668,7 @@ static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file area->vm_ops = &snd_pcm_vm_ops_status; area->vm_private_data = substream; area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; + area->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); return 0; }