diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/inode.c | 2 | ||||
| -rw-r--r-- | kernel/pid.c | 2 | ||||
| -rw-r--r-- | kernel/pid_namespace.c | 22 |
3 files changed, 16 insertions, 10 deletions
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c index 5c2e96b19392..6d021d18afa6 100644 --- a/kernel/bpf/inode.c +++ b/kernel/bpf/inode.c @@ -788,7 +788,7 @@ static void bpf_free_inode(struct inode *inode) const struct super_operations bpf_super_ops = { .statfs = simple_statfs, - .drop_inode = generic_delete_inode, + .drop_inode = inode_just_drop, .show_options = bpf_show_options, .free_inode = bpf_free_inode, }; diff --git a/kernel/pid.c b/kernel/pid.c index c45a28c16cd2..d94ce0250501 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -680,7 +680,7 @@ static int pid_table_root_permissions(struct ctl_table_header *head, container_of(head->set, struct pid_namespace, set); int mode = table->mode; - if (ns_capable(pidns->user_ns, CAP_SYS_ADMIN) || + if (ns_capable_noaudit(pidns->user_ns, CAP_SYS_ADMIN) || uid_eq(current_euid(), make_kuid(pidns->user_ns, 0))) mode = (mode & S_IRWXU) >> 6; else if (in_egroup_p(make_kgid(pidns->user_ns, 0))) diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index 7098ed44e717..b7b45c2597ec 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -390,11 +390,23 @@ static void pidns_put(struct ns_common *ns) put_pid_ns(to_pid_ns(ns)); } +bool pidns_is_ancestor(struct pid_namespace *child, + struct pid_namespace *ancestor) +{ + struct pid_namespace *ns; + + if (child->level < ancestor->level) + return false; + for (ns = child; ns->level > ancestor->level; ns = ns->parent) + ; + return ns == ancestor; +} + static int pidns_install(struct nsset *nsset, struct ns_common *ns) { struct nsproxy *nsproxy = nsset->nsproxy; struct pid_namespace *active = task_active_pid_ns(current); - struct pid_namespace *ancestor, *new = to_pid_ns(ns); + struct pid_namespace *new = to_pid_ns(ns); if (!ns_capable(new->user_ns, CAP_SYS_ADMIN) || !ns_capable(nsset->cred->user_ns, CAP_SYS_ADMIN)) @@ -408,13 +420,7 @@ static int pidns_install(struct nsset *nsset, struct ns_common *ns) * this maintains the property that processes and their * children can not escape their current pid namespace. */ - if (new->level < active->level) - return -EINVAL; - - ancestor = new; - while (ancestor->level > active->level) - ancestor = ancestor->parent; - if (ancestor != active) + if (!pidns_is_ancestor(new, active)) return -EINVAL; put_pid_ns(nsproxy->pid_ns_for_children); |