linux-kernel - Re: [PATCH 1/2] mmap locking API: Order lock of nascent mm outside lock of live mm

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Message-ID: <20201005125216.GV816047@nvidia.com>
Date:   Mon, 5 Oct 2020 09:52:16 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Jann Horn <jannh@...gle.com>
CC:     Michel Lespinasse <walken@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Jeff Dike <jdike@...toit.com>,
        "Richard Weinberger" <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        <linux-um@...ts.infradead.org>, John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH 1/2] mmap locking API: Order lock of nascent mm outside
 lock of live mm

On Mon, Oct 05, 2020 at 03:30:43AM +0200, Jann Horn wrote:
> But another place where lockdep asserts should be added is find_vma();
> there are currently several architectures that sometimes improperly
> call that with no lock held:

Yes, I've seen several cases of this mis-use in drivers too

Jason