Please ignore step 4, lxc.id_map only allow ONE uid/gid, so lxc_switch_uid_gid will fail
On Fri, Dec 15, 2017 at 10:17 AM Philip <[email protected]> wrote: > 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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