diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/fork.c | 8 | ||||
| -rw-r--r-- | kernel/pid.c | 15 | ||||
| -rw-r--r-- | kernel/pid_namespace.c | 4 | ||||
| -rw-r--r-- | kernel/printk.c | 5 | ||||
| -rw-r--r-- | kernel/signal.c | 9 |
5 files changed, 30 insertions, 11 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index a31b823b3c2d..65ca6d27f24e 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1166,6 +1166,14 @@ static struct task_struct *copy_process(unsigned long clone_flags, current->signal->flags & SIGNAL_UNKILLABLE) return ERR_PTR(-EINVAL); + /* + * If the new process will be in a different pid namespace + * don't allow the creation of threads. + */ + if ((clone_flags & (CLONE_VM|CLONE_NEWPID)) && + (task_active_pid_ns(current) != current->nsproxy->pid_ns)) + return ERR_PTR(-EINVAL); + retval = security_task_create(clone_flags); if (retval) goto fork_out; diff --git a/kernel/pid.c b/kernel/pid.c index 36aa02ff17d6..de9af600006f 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -270,7 +270,6 @@ void free_pid(struct pid *pid) wake_up_process(ns->child_reaper); break; case 0: - ns->nr_hashed = -1; schedule_work(&ns->proc_work); break; } @@ -319,7 +318,7 @@ struct pid *alloc_pid(struct pid_namespace *ns) upid = pid->numbers + ns->level; spin_lock_irq(&pidmap_lock); - if (ns->nr_hashed < 0) + if (!(ns->nr_hashed & PIDNS_HASH_ADDING)) goto out_unlock; for ( ; upid >= pid->numbers; --upid) { hlist_add_head_rcu(&upid->pid_chain, @@ -342,6 +341,13 @@ out_free: goto out; } +void disable_pid_allocation(struct pid_namespace *ns) +{ + spin_lock_irq(&pidmap_lock); + ns->nr_hashed &= ~PIDNS_HASH_ADDING; + spin_unlock_irq(&pidmap_lock); +} + struct pid *find_pid_ns(int nr, struct pid_namespace *ns) { struct hlist_node *elem; @@ -573,6 +579,9 @@ void __init pidhash_init(void) void __init pidmap_init(void) { + /* Veryify no one has done anything silly */ + BUILD_BUG_ON(PID_MAX_LIMIT >= PIDNS_HASH_ADDING); + /* bump default and minimum pid_max based on number of cpus */ pid_max = min(pid_max_max, max_t(int, pid_max, PIDS_PER_CPU_DEFAULT * num_possible_cpus())); @@ -584,7 +593,7 @@ void __init pidmap_init(void) /* Reserve PID 0. We never call free_pidmap(0) */ set_bit(0, init_pid_ns.pidmap[0].page); atomic_dec(&init_pid_ns.pidmap[0].nr_free); - init_pid_ns.nr_hashed = 1; + init_pid_ns.nr_hashed = PIDNS_HASH_ADDING; init_pid_ns.pid_cachep = KMEM_CACHE(pid, SLAB_HWCACHE_ALIGN | SLAB_PANIC); diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index fdbd0cdf271a..c1c3dc1c6023 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -115,6 +115,7 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns ns->level = level; ns->parent = get_pid_ns(parent_pid_ns); ns->user_ns = get_user_ns(user_ns); + ns->nr_hashed = PIDNS_HASH_ADDING; INIT_WORK(&ns->proc_work, proc_cleanup_work); set_bit(0, ns->pidmap[0].page); @@ -181,6 +182,9 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns) int rc; struct task_struct *task, *me = current; + /* Don't allow any more processes into the pid namespace */ + disable_pid_allocation(pid_ns); + /* Ignore SIGCHLD causing any terminated children to autoreap */ spin_lock_irq(&me->sighand->siglock); me->sighand->action[SIGCHLD - 1].sa.sa_handler = SIG_IGN; diff --git a/kernel/printk.c b/kernel/printk.c index 19c0d7bcf24a..357f714ddd49 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -870,10 +870,11 @@ static size_t print_time(u64 ts, char *buf) if (!printk_time) return 0; + rem_nsec = do_div(ts, 1000000000); + if (!buf) - return 15; + return snprintf(NULL, 0, "[%5lu.000000] ", (unsigned long)ts); - rem_nsec = do_div(ts, 1000000000); return sprintf(buf, "[%5lu.%06lu] ", (unsigned long)ts, rem_nsec / 1000); } diff --git a/kernel/signal.c b/kernel/signal.c index 7aaa51d8e5b8..372771e948c2 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -2528,11 +2528,8 @@ static void __set_task_blocked(struct task_struct *tsk, const sigset_t *newset) */ void set_current_blocked(sigset_t *newset) { - struct task_struct *tsk = current; sigdelsetmask(newset, sigmask(SIGKILL) | sigmask(SIGSTOP)); - spin_lock_irq(&tsk->sighand->siglock); - __set_task_blocked(tsk, newset); - spin_unlock_irq(&tsk->sighand->siglock); + __set_current_blocked(newset); } void __set_current_blocked(const sigset_t *newset) @@ -3204,7 +3201,6 @@ SYSCALL_DEFINE3(sigprocmask, int, how, old_sigset_t __user *, nset, if (nset) { if (copy_from_user(&new_set, nset, sizeof(*nset))) return -EFAULT; - new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); new_blocked = current->blocked; @@ -3222,7 +3218,7 @@ SYSCALL_DEFINE3(sigprocmask, int, how, old_sigset_t __user *, nset, return -EINVAL; } - __set_current_blocked(&new_blocked); + set_current_blocked(&new_blocked); } if (oset) { @@ -3286,6 +3282,7 @@ SYSCALL_DEFINE1(ssetmask, int, newmask) int old = current->blocked.sig[0]; sigset_t newset; + siginitset(&newset, newmask); set_current_blocked(&newset); return old; |
