Re: [PATCH v17 01/15] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve from granting privs

[Markus Gutschke <markus@xxxxxxxxxxxx>]

On Fri, Apr 6, 2012 at 13:54, Andrew Lutomirski <luto@xxxxxxx> wrote:
> (FWIW, I think that CLONE_NEWPID interacts badly with unix socket
> credentials and should be fixed as a prerequisite for making it easier
> to access.)

sendmsg() is a big hair ball. And yes, I have all sorts of things on
my wish list that touch sendmsg(). I don't think, I'll get them
fullfilled anytime soon, though:

 - sendmsg() does lots of different things: sending on unconnected
sockets, sending file descriptors, sending unix decriptors, and
plain-old sending data. These operations have very different security
properties and implications. It would be awesome if BPF filters could
filter these different types of operations selectively.

 - ancillary data is a cool concept in general. We should use it more.
If I could send a memory mapping from one process to another, that
would solve so many problems. But I know, I am dreaming; I don't
expect to see this feature any time soon.


Markus
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