Re: [PATCH 01/11] fs: add O_BENEATH_ONLY flag to openat(2)

[Andy Lutomirski]

On Mon, Jun 30, 2014 at 1:40 PM, Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
> David Drysdale <drysdale@xxxxxxxxxx> writes:
>
>> Add a new O_BENEATH_ONLY flag for openat(2) which restricts the
>> provided path, rejecting (with -EACCES) paths that are not beneath
>> the provided dfd.  In particular, reject:
>>  - paths that contain .. components
>>  - paths that begin with /
>>  - symlinks that have paths as above.
>
> How about bind mounts?

What's the problematic scenario?

--Andy
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