Re: [PATCH RFC net-next 03/14] bpf: introduce syscall(BPF, ...) and BPF maps

On Fri, Jun 27, 2014 at 5:05 PM, Alexei Starovoitov [off-list ref] wrote:

BPF syscall is a demux for different BPF releated commands.

'maps' is a generic storage of different types for sharing data between kernel
and userspace.

The maps can be created/deleted from user space via BPF syscall:
- create a map with given id, type and attributes
  map_id = bpf_map_create(int map_id, map_type, struct nlattr *attr, int len)
  returns positive map id or negative error

- delete map with given map id
  err = bpf_map_delete(int map_id)
  returns zero or negative error

What's the scope of "id"?  How is it secured?

This question is brought to you by keyctl, which is terminally fucked.
At some point I'll generate some proof of concept exploits for severe
bugs caused by misdesign of a namespace.

--Andy