linux-kernel - Re: [PATCH 2/6] shm: add sealing API

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Message-ID: <CANq1E4SU3QfLwBDEwDVGS7HNxOC2m2hjnv=ZuM1i+jCqqDM=sA@mail.gmail.com>
Date:	Mon, 14 Apr 2014 02:03:22 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Tony Battersby <tonyb@...ernetics.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 2/6] shm: add sealing API

Hi

On Sat, Apr 12, 2014 at 12:07 AM, Andy Lutomirski <luto@...capital.net> wrote:
> I bet this is missing from lots of places.  For example, I can't find
> any write_access stuff in the rdma code.
>
> I suspect that the VM_DENYWRITE code is just generally racy.

So what does S_IMMUTABLE do to prevent such races? I somehow suspect
it's broken in that regard, too.

I really dislike pinning pages like this, but if people want to keep
it I guess I have to scan all shmem-inode pages before changing seals.

Thanks
David
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