Re: [PATCH v3 0/7] User namespace mount updates

From: Richard Weinberger
Date: Tue Nov 17 2015 - 14:12:37 EST

On Tue, Nov 17, 2015 at 7:34 PM, Seth Forshee
<seth.forshee@xxxxxxxxxxxxx> wrote:
> On Tue, Nov 17, 2015 at 05:55:06PM +0000, Al Viro wrote:
>> On Tue, Nov 17, 2015 at 11:25:51AM -0600, Seth Forshee wrote:
>> > Shortly after that I plan to follow with support for ext4. I've been
>> > fuzzing ext4 for a while now and it has held up well, and I'm currently
>> > working on hand-crafted attacks. Ted has commented privately (to others,
>> > not to me personally) that he will fix bugs for such attacks, though I
>> > haven't seen any public comments to that effect.
>> _Static_ attacks, or change-image-under-mounted-fs attacks?
> Right now only static attacks, change-image-under-mounted-fs attacks
> will be next.

Do we *really* need to enable unprivileged mounting of kernel filesystems?
What about just enabling fuse and implement ext4 and friends as fuse
Using the approaching Linux Kernel Libary[1] this is easy.

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