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: <3db11c51eeb323c5b81ba29772128109160dc14f.camel@surriel.com>
Date:   Tue, 15 Feb 2022 15:26:57 -0500
From:   Rik van Riel <riel@...riel.com>
To:     Suren Baghdasaryan <surenb@...gle.com>, akpm@...ux-foundation.org
Cc:     mhocko@...nel.org, mhocko@...e.com, shy828301@...il.com,
        rientjes@...gle.com, willy@...radead.org, hannes@...xchg.org,
        guro@...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 Tue, 2022-02-15 at 12:19 -0800, Suren Baghdasaryan wrote:
> After exit_mmap frees all vmas in the mm, mm->mmap needs to be reset,
> otherwise it points to a vma that was freed and when reused leads to
> a use-after-free bug.
> 
> Reported-by: syzbot+2ccf63a4bd07cf39cab0@...kaller.appspotmail.com
> Suggested-by: Michal Hocko <mhocko@...e.com>
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> 
Reviewed-by: Rik van Riel <riel@...riel.com>

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