lkml.org 
[lkml]   [2006]   [Feb]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] fork: Allow init to become a session leader.
"Eric W. Biederman" wrote:
>
> With the bug fixes from killing session == 0 and pgrp == 0 we
> have essentially made pid == 1 a session leader. However reading
> through the code I can see nothing, that sets the session->leader
> flag. In fact we actively clear it in all cases during clone.
> And setsid will fail to set it because the session == 1 and
> process group == 1 already exist.
>
> So this patch forces the session leader flag and for good measure
> the pgrp, session and tty of init as well.
>
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -1179,9 +1179,16 @@ static task_t *copy_process(unsigned lon
> attach_pid(p, PIDTYPE_PID, p->pid);
> attach_pid(p, PIDTYPE_TGID, p->tgid);
> if (thread_group_leader(p)) {
> - p->signal->tty = current->signal->tty;
> - p->signal->pgrp = process_group(current);
> - p->signal->session = current->signal->session;
> + if (unlikely(p->pid == 1)) {
> + p->signal->tty = NULL;
> + p->signal->leader = 1;
> + p->signal->pgrp = 1;
> + p->signal->session = 1;

Isn't it enough to just set current->signal->leader = 1
in init/main.c:init() ? This process was already forked
with (1,1) special pids and ->tty == NULL.

Oleg.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-02-08 18:14    [W:0.037 / U:0.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site