linux-kernel - Re: [PATCH 1/1] mm: fix use-after-free bug when mm->mmap is reused after being freed

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Message-ID: <Yg9UjvEj5fDShG47@dhcp22.suse.cz>
Date:   Fri, 18 Feb 2022 09:10:54 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     akpm@...ux-foundation.org, shy828301@...il.com,
        rientjes@...gle.com, willy@...radead.org, hannes@...xchg.org,
        guro@...com, riel@...riel.com, minchan@...nel.org,
        kirill@...temov.name, aarcange@...hat.com, brauner@...nel.org,
        christian@...uner.io, hch@...radead.org, oleg@...hat.com,
        david@...hat.com, jannh@...gle.com, shakeelb@...gle.com,
        luto@...nel.org, christian.brauner@...ntu.com, fweimer@...hat.com,
        jengelh@...i.de, timmurray@...gle.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        syzbot+2ccf63a4bd07cf39cab0@...kaller.appspotmail.com
Subject: Re: [PATCH 1/1] mm: fix use-after-free bug when mm->mmap is reused
 after being freed

On Thu 17-02-22 11:51:13, Suren Baghdasaryan wrote:
> On Tue, Feb 15, 2022 at 11:54 PM Michal Hocko <mhocko@...e.com> wrote:
[...]
> > I really have to say that I hate how complex this has grown in the name
> > of optimizations. This has backfired several times already resulting in
> > 2 security issues. I really hope to get read any note of the oom reaper
> > from exit_mmap.
> 
> Agree. I want to take another stab at removing __oom_reap_task_mm from
> exit_mmap. Now that Hugh made changes to mlock mechanisms and
> __oom_reap_task_mm does not skip locked vmas I think that should be
> possible. Planning to look into that sometimes next week.

Thanks!
-- 
Michal Hocko
SUSE Labs