linux-kernel - Re: general protection fault in kernfs_add

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Message-ID: <CACT4Y+ZQ6uB2qNjjbyvqgvywZvDay8Zo9mqUw=FhGUysAf9yiA@mail.gmail.com>
Date:   Fri, 22 Nov 2019 09:10:54 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        syzbot <syzbot+db1637662f412ac0d556@...kaller.appspotmail.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rafael Wysocki <rafael@...nel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Tejun Heo <tj@...nel.org>,
        linux-bluetooth <linux-bluetooth@...r.kernel.org>
Subject: Re: general protection fault in kernfs_add_one

On Wed, Nov 20, 2019 at 5:54 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Tue, Nov 19, 2019 at 8:04 PM Benjamin Herrenschmidt
> <benh@...nel.crashing.org> wrote:
> >
> > Could this be what was fixed by:
> >
> > ac43432cb1f5c2950408534987e57c2071e24d8f
> > ("driver core: Fix use-after-free and double free on glue directory")
> >
> > Which went into 5.3 afaik ?
>
> Hmm. Sounds very possible. It matches the commit syzbot bisected to,
> and looking at the reports, the I can't find anything that is 5.3 or
> later.
>
> I did find a 5.3.0-rc2+ report, but that's still consistent with that
> commit: it got merged just before 5.3-rc4.
>
> So I think you're right.
>
> I forget what the magic email rule was to report that something is
> fixed to syzbot..

Hi Linus,

This would be:

#syz fix: driver core: Fix use-after-free and double free on glue directory

FTR, the cheat sheet is referenced in every bug report:

> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.