Messages in this thread | | | From | Andy Lutomirski <> | Date | Mon, 2 Feb 2015 12:37:54 -0800 | Subject | Re: [capabilities] Allow normal inheritance for a configurable set of capabilities |
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On Mon, Feb 2, 2015 at 10:08 AM, Serge Hallyn <serge.hallyn@ubuntu.com> wrote: > Quoting Casey Schaufler (casey@schaufler-ca.com): >> I'm game to participate in such an effort. The POSIX scheme >> is workable, but given that it's 20 years old and hasn't >> developed real traction it's hard to call it successful. > > Over the years we've several times discussed possible reasons for this > and how to help. I personally think it's two things: 1. lack of > toolchain and fs support. The fact that we cannot to this day enable > ping using capabilities by default because of cpio, tar and non-xattr > filesystems is disheartening. 2. It's hard for users and applications > to know what caps they need. yes the API is a bear to use, but we can > hide that behind fancier libraries. But using capabilities requires too > much in-depth knowledge of precisely what caps you might need for > whatever operations library may now do when you asked for something.
None of this could address the problem here, though: if I hold a capability and I want to pass that capability to an exec'd helper, I shouldn't need the fs's help to do this.
--Andy
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