kern/39329: [mount] '..' at mountpoint is subject to the ?permissions of the shadowed dir

Oliver Fromme olli at lurza.secnetix.de
Tue Aug 17 13:12:50 UTC 2010


arundel at freebsd.org wrote:
 > Synopsis: [mount] '..' at mountpoint is subject to the permissions of the shadowed dir

That's not a bug.  It's supposed to work that way, and it
works like this in all UNIX variants that I'm aware of.
In fact I think it would be a bug if the behaviour was
changed.  That might even break some legitimate uses of
the feature.

It is clearly documented in the mount(8) manual page:

    After a successful mount, the permissions on the original
    mount point determine if '..' is accessible from the mounted
    file system.  The minimum permissions for the mount point
    for traversal across the mount point in both directions to
    be possible for all users is 0111 (execute for all).

This PR should be closed.

Best regards
   Oliver

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