Re: Names vs. Inodes

From: David Wagner (dawat_private)
Date: Fri Jul 20 2001 - 21:47:33 PDT

  • Next message: Crispin Cowan: "Re: Names vs. Inodes"

    Crispin Cowan  wrote:
    >In SubDomain, we need to know the absolute path name of a file that a
    >process is trying to open.
    
    Would you consider the following strategy?  If you want to support
    denying access to all pathnames that match /var/log/*, then rather than
    trying to reconstruct the pathname to open() and pattern-matching, maybe
    one alternative could be to monitor the directory traversal (is this
    lookup_dentry() or somesuch?) and deny access preemptorily as soon as
    you see an access to the directory "/var/log".  This only works if you
    want to support very simple styles of pathname wildcarding, of course,
    but it has the advantage of being simple and taking advantage of the
    kernel's existing pathname->inode resolution logic (rather than having
    to re-implement your own).  Would this work for you?
    
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