23 Oct
2018
23 Oct
'18
3:49 p.m.
On Mon, Oct 22, 2018 at 10:02:44AM -0700, Dmitry Torokhov wrote:
Hi Sasha,
On Mon, Oct 22, 2018 at 06:19:05AM -0400, Sasha Levin wrote:
From: Dmitry Torokhov dmitry.torokhov@gmail.com
[ Upstream commit 36d2582ff235b4e01ad64a734c877a52dc762d9c ]
Large writes to evdev interface may cause rcu stalls. Let's add cond_resched() to the loop to avoid this.
This is not needed in stable:
- the interfaces are not accessible for unprivileged users so there is
no DOS concerns
- the issue can only happen on non-preemptible kernels
- the issue only showed up with synthetic test and not real life use
cases
- this is not a regression
The same goes to similar patches to mousedev, joydev and uinput that you autoselected.
Dropped, thanks!
-- Thanks, Sasha