Re: [PATCH v11 21/48] ext4: Add richacl feature flag

Austin S Hemmelgarn
2015-10-19T13:16:59Z

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On 2015-10-16 13:41, Andreas Gruenbacher wrote:
> On Fri, Oct 16, 2015 at 7:31 PM, Austin S Hemmelgarn
> <ahferroin7@gmail.com> wrote:
>> I would like to re-iterate, on both XFS and ext4, I _really_ think this
>> should be a ro_compat flag, and not an incompat one. If a person has the
>> ability to mount the FS (even if it's a read-only mount), then they by
>> definition have read access to the file or partition that the filesystem is
>> contained in, which means that any ACL's stored on the filesystem are
>> functionally irrelevant,
>
> It is unfortunately not safe to make such a file system accessible to
> other users, so the feature is not strictly read-only compatible.
>
OK, seeing as I wasn't particularly clear as to why I object to this in
my other e-mail, let's try this again.

Can you please explain exactly why it isn't safe to make such a
filesystem accessible to other users? Because that _really_ sounds to
me like you are trying to rely on this being un-mountable on a kernel
that doesn't support richacls to try and provide the illusion of better
security.

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