[lxc-users] unprivileged container + setcap not working

[Philip]

Hi,

I want to use unprivileged container + setcap to set limited capabilities,
but can not success, here is my test (lxc-1.0.8 and lxc-2.0.8):

testapp:
int ret = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
fprintf(stderr, "socket ret %d, %s\n", ret, strerror(errno));

1. add net_raw capability
setcap cap_net_admin,cap_net_raw=eip ./testapp

2. switch to uid 2000, execute testapp
$ ./testapp
socket ret 3, Success

3. use unprivileged container to run testapp
lxc config:
lxc.network.type = none
lxc.id_map = u 0 2000 1
lxc.id_map = g 0 2000 1

sudo lxc-execute -n testapp -f config -P /files/testapp
....
socket ret -1, Operation not permitted

4. using lxc-2.0.8, add init_uid/init_gid
lxc.init_uid = 2000
lxc.init_gid = 2000

lxc-execute: utils.c: lxc_switch_uid_gid: 2069 Invalid argument - Failed to
switch to gid 2000.

Can anyone help, what is going wrong?
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