Commit 390e2ff0 authored Mar 31, 2006 by Eric W. Biederman Committed by Linus Torvalds Mar 31, 2006

[PATCH] Make setsid() more robust



The core problem: setsid fails if it is called by init.  The effect in 2.6.16
and the earlier kernels that have this problem is that if you do a "ps -j 1 or
ps -ej 1" you will see that init and several of it's children have process
group and session == 0.  Instead of process group == session == 1.  Despite
init calling setsid.

The reason it fails is that daemonize calls set_special_pids(1,1) on kernel
threads that are launched before /sbin/init is called.

The only remaining effect in that current->signal->leader == 0 for init
instead of 1.  And the setsid call fails.  No one has noticed because
/sbin/init does not check the return value of setsid.

In 2.4 where we don't have the pidhash table, and daemonize doesn't exist
setsid actually works for init.

I care a lot about pid == 1 not being a special case that we leave broken,
because of the container/jail work that I am doing.

- Carefully allow init (pid == 1) to call setsid despite the kernel using
  its session.

- Use find_task_by_pid instead of find_pid because find_pid taking a
  pidtype is going away.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent 9741ef96

kernel/sys.c

+15 −4

Original line number	Diff line number	Diff line
		@@ -1372,18 +1372,29 @@ asmlinkage long sys_getsid(pid_t pid)
		asmlinkage long sys_setsid(void)
		{
		struct task_struct *group_leader = current->group_leader;
		struct pid *pid;
		pid_t session;
		int err = -EPERM;

		mutex_lock(&tty_mutex);
		write_lock_irq(&tasklist_lock);

		pid = find_pid(PIDTYPE_PGID, group_leader->pid);
		if (pid)
		/* Fail if I am already a session leader */
		if (group_leader->signal->leader)
		goto out;

		session = group_leader->pid;
		/* Fail if a process group id already exists that equals the
		* proposed session id.
		*
		* Don't check if session id == 1 because kernel threads use this
		* session id and so the check will always fail and make it so
		* init cannot successfully call setsid.
		*/
		if (session > 1 && find_task_by_pid_type(PIDTYPE_PGID, session))
		goto out;

		group_leader->signal->leader = 1;
		__set_special_pids(group_leader->pid, group_leader->pid);
		__set_special_pids(session, session);
		group_leader->signal->tty = NULL;
		group_leader->signal->tty_old_pgrp = 0;
		err = process_group(group_leader);

Admin message