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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 

Pull pid namespace fixes from Eric Biederman:
 "These are two bugs that turn out to have simple fixes that were
  reported during the merge window. Both of these issues have existed
  for a while and it just happens that they both were reported at almost
  the same time"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  pid_ns: Fix race between setns'ed fork() and zap_pid_ns_processes()
  pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes
This commit is contained in:
Linus Torvalds 2017-05-18 10:04:42 -07:00
parent af5d28565f 3fd3722621
commit 16d95c4396
2 changed files with 7 additions and 3 deletions
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8
kernel/fork.c
View File

@ -1845,11 +1845,13 @@ static __latent_entropy struct task_struct *copy_process(
*/
recalc_sigpending();
if (signal_pending(current)) {
spin_unlock(&current->sighand->siglock);
write_unlock_irq(&tasklist_lock);
retval = -ERESTARTNOINTR;
goto bad_fork_cancel_cgroup;
}
if (unlikely(!(ns_of_pid(pid)->nr_hashed & PIDNS_HASH_ADDING))) {
retval = -ENOMEM;
goto bad_fork_cancel_cgroup;
}
if (likely(p->pid)) {
ptrace_init_task(p, (clone_flags & CLONE_PTRACE) || trace);
@ -1907,6 +1909,8 @@ static __latent_entropy struct task_struct *copy_process(
return p;
bad_fork_cancel_cgroup:
spin_unlock(&current->sighand->siglock);
write_unlock_irq(&tasklist_lock);
cgroup_cancel_fork(p);
bad_fork_free_pid:
cgroup_threadgroup_change_end(current);

2
kernel/pid_namespace.c
View File

@ -277,7 +277,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
* if reparented.
*/
for (;;) {
set_current_state(TASK_UNINTERRUPTIBLE);
set_current_state(TASK_INTERRUPTIBLE);
if (pid_ns->nr_hashed == init_pids)
break;
schedule();