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

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Message-ID: <ZqNWOLwOoKfquBvH@tiehlicka>
Date: Fri, 26 Jul 2024 09:54:32 +0200
From: Michal Hocko <mhocko@...e.com>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memcg_write_event_control(): fix a user-triggerable oops

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@...iv.linux.org.uk>
> > > 
> > > Acked-by: Michal Hocko <mhocko@...e.com>
> > 
> > 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