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authorTakashi Iwai <tiwai@suse.de>2017-11-05 10:07:43 +0100
committerTakashi Iwai <tiwai@suse.de>2017-11-06 10:41:24 +0100
commit9b7d869ee5a77ed4a462372bb89af622e705bfb8 (patch)
tree8151b57ebb526eac4c1bf711aa01bfe0972eecaa /include/sound/timer.h
parentf5ce817951f38023588b2b8308beca79abe20507 (diff)
downloadlinux-9b7d869ee5a77ed4a462372bb89af622e705bfb8.tar.bz2
ALSA: timer: Limit max instances per timer
Currently we allow unlimited number of timer instances, and it may bring the system hogging way too much CPU when too many timer instances are opened and processed concurrently. This may end up with a soft-lockup report as triggered by syzkaller, especially when hrtimer backend is deployed. Since such insane number of instances aren't demanded by the normal use case of ALSA sequencer and it merely opens a risk only for abuse, this patch introduces the upper limit for the number of instances per timer backend. As default, it's set to 1000, but for the fine-grained timer like hrtimer, it's set to 100. Reported-by: syzbot Tested-by: Jérôme Glisse <jglisse@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound/timer.h')
-rw-r--r--include/sound/timer.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/sound/timer.h b/include/sound/timer.h
index c4d76ff056c6..7ae226ab6990 100644
--- a/include/sound/timer.h
+++ b/include/sound/timer.h
@@ -90,6 +90,8 @@ struct snd_timer {
struct list_head ack_list_head;
struct list_head sack_list_head; /* slow ack list head */
struct tasklet_struct task_queue;
+ int max_instances; /* upper limit of timer instances */
+ int num_instances; /* current number of timer instances */
};
struct snd_timer_instance {