Re: [PATCH] memcg_write_event_control(): fix a user-triggerable oops

[Michal Hocko]

On Fri 26-07-24 08:48:04, Al Viro wrote:
> On Fri, Jul 26, 2024 at 09:13:00AM +0200, Michal Hocko wrote:
> > On Fri 26-07-24 09:06:59, Michal Hocko wrote:
> > > On Fri 26-07-24 06:43:57, Al Viro wrote:
> > > > We are *not* guaranteed that anything past the terminating NUL
> > > > is mapped (let alone initialized with anything sane).
> > > >     
> > > 
> > > Fixes: 0dea116876ee ("cgroup: implement eventfd-based generic API for notifications")
> > > 
> > > > Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> > > 
> > > Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> > 
> > Btw. this should be
> > Cc: stable
> 
> Point, except that for -stable it needs to be applied to mm/memcontrol.c
> instead...

Correct. And if anybody wants to backport to pre 3.14 then to
kernel/cgroup.c

-- 
Michal Hocko
SUSE Labs