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    SubjectRe: [AppArmor 01/41] Pass struct vfsmount to the inode_create LSM hook
    Date
    On May 24, 2007, at 14:58:41, Casey Schaufler wrote:
    > On Fedora zcat, gzip and gunzip are all links to the same file. I
    > can imagine (although it is a bit of a stretch) allowing a set of
    > users access to gunzip but not gzip (or the other way around).

    That is a COMPLETE straw-man argument. I can override your "check"
    with this absolutely trivial perl code:

    exec { "/usr/bin/gunzip" } "gzip", "-9", "some/file/to.gz";

    Pathname-based checks are pretty fundamentally insecure. If you want
    to protect a "name", then you should tag the "name" with security
    attributes (IE: AppArmor). On the other hand, if you actually want
    to protect the _data_, then tagging the _name_ is flawed; tag the
    *DATA* instead.

    Cheers,
    Kyle Moffett

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