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ALSA: pcm: Make mmap status read-only

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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>
This commit is contained in:
Takashi Iwai 2022-09-26 15:55:49 +02:00
parent f0061c18c1
commit 1be2143fb7
1 changed files with 1 additions and 0 deletions
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sound/core/pcm_native.c
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@ -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;
}