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

[Alexei Starovoitov <ast@plumgrid.com>]

On Fri, Jun 27, 2014 at 5:16 PM, Andy Lutomirski <luto@amacapital.net> wrote:
> On Fri, Jun 27, 2014 at 5:05 PM, Alexei Starovoitov <ast@plumgrid.com> 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?

the map and program id space is global and it's cap_sys_admin only.
There is no pressing need to do it with per-user limits.
So the whole thing is root only for now.

Since I got your attention please review the most interesting
verifier bits (patch 08/14) ;)