diff options
Diffstat (limited to 'kernel/user_namespace.c')
-rw-r--r-- | kernel/user_namespace.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index e382fcdc57d6..36b432b0cb7b 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -836,6 +836,20 @@ static bool new_idmap_permitted(const struct file *file, return false; } +bool userns_may_setgroups(const struct user_namespace *ns) +{ + bool allowed; + + mutex_lock(&id_map_mutex); + /* It is not safe to use setgroups until a gid mapping in + * the user namespace has been established. + */ + allowed = ns->gid_map.nr_extents != 0; + mutex_unlock(&id_map_mutex); + + return allowed; +} + static void *userns_get(struct task_struct *task) { struct user_namespace *user_ns; |