Glauber Costa wrote:
+ if (arg->h->can_join_userns) {
+ setuid(0);
+ setgid(0);
+ /*
+ * We need the special flag "newinstance". This is a requirement
+ * of the userns-aware implementation of devpts as of Linux 3.9.
+ * Because of that special requirement, we do it here rather
than
+ * later.
+ */
+ mount("devpts", "/dev/pts", "devpts", 0, "newinstance");
BTW, some kernel versions ago... I added to devpts filesystem mount option
max=%d,
which limits capacity of this devpts instance. Just FYI.
+ /* /dev/ptmx, if it even exists, would refer to the root ptmx.
+ * We don't want that, we want our newly created instance to
contain
+ * all ptys. So we bind mount the root device here
+ */
+ open("/dev/ptmx", O_RDWR|O_CREAT, 0);
+ mount("/dev/pts/ptmx", "/dev/ptmx", "", MS_BIND, 0);
+ }
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