linux-kernel - Re: [syzbot] WARNING: refcount bug in sys_memfd

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Message-ID: <YXTxN5skPPFPvScP@kernel.org>
Date:   Sun, 24 Oct 2021 08:37:59 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+b904a1de3ec43711eba5@...kaller.appspotmail.com>,
        Jordy Zomer <jordy@...ing.systems>, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING: refcount bug in sys_memfd_secret

On Sat, Oct 23, 2021 at 11:46:18PM +0100, Matthew Wilcox wrote:
> On Sat, Oct 23, 2021 at 10:03:11AM -0700, Kees Cook wrote:
> > On October 23, 2021 8:27:28 AM PDT, Mike Rapoport <rppt@...nel.org> wrote:
> > >and my first reaction was to send a revert the untested commit 110860541f44
> > >("mm/secretmem: use refcount_t instead of atomic_t"). 
> 
> I think you should.  This isn't a real problem. 

Do you mean that creation of 4 billion of file descriptors is not feasible?

-- 
Sincerely yours,
Mike.