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attach: unshare cgroupns if possible

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Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
---
Changelog 20160104: only try if kernel supports cgns.
This commit is contained in:
Serge Hallyn 2015-11-09 18:17:31 -06:00
parent 12983ba458
commit 6cee93ac80
1 changed files with 7 additions and 0 deletions
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7
src/lxc/attach.c
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@ -957,6 +957,13 @@ int lxc_attach(const char* name, const char* lxcpath, lxc_attach_exec_t exec_fun
WARN("could not change directory to '%s'", new_cwd);
free(cwd);
if (options->attach_flags & LXC_ATTACH_MOVE_TO_CGROUP && cgns_supported()) {
if (unshare(CLONE_NEWCGROUP) != 0) {
SYSERROR("cgroupns unshare: permission denied");
rexit(-1);
}
}
/* now create the real child process */
{
struct attach_clone_payload payload = {