Re: [PATCH] ioctl_getfsmap.2: document the GETFSMAP ioctl

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On Mon, May 08, 2017 at 12:17:53AM +0200, Jann Horn wrote:
> On Sun, May 7, 2017 at 5:58 PM, Darrick J. Wong <darrick.wong@xxxxxxxxxx> wrote:
> > Document the new GETFSMAP ioctl that returns the physical layout of a
> > (disk-based) filesystem.
> [...]
> > +.B EPERM
> > +This query is not allowed.
> 
> Please document the circumstances under which a query is allowed.

For the two current implementations, queries are always allowed.

(The doc could be more explicit about this decision being left to the
implementation.)

> Also: From a quick glance at the XFS implementation, I don't see any
> privilege checks. Am I missing something, or does this API permit an
> unprivileged user to determine the number of physical blocks allocated
> for any inode, even for inodes the user can't ordinarily see in any
> way?

Correct.

--D

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