From 2ceb8693ef63ae3d154ce1a05d275f2bb20a5e4c Mon Sep 17 00:00:00 2001 From: Oleg Nesterov <oleg@tv-sign.ru> Date: Mon, 26 Jun 2006 00:26:04 -0700 Subject: [PATCH] [PATCH] de_thread: fix lockless do_each_thread We should keep the value of old_leader->tasks.next in de_thread, otherwise we can't do for_each_process/do_each_thread without tasklist_lock held. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> --- fs/exec.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/fs/exec.c b/fs/exec.c index 8c5196087f31..fffea1eef8dc 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -707,7 +707,7 @@ static int de_thread(struct task_struct *tsk) attach_pid(current, PIDTYPE_PID, current->pid); attach_pid(current, PIDTYPE_PGID, current->signal->pgrp); attach_pid(current, PIDTYPE_SID, current->signal->session); - list_add_tail_rcu(¤t->tasks, &init_task.tasks); + list_replace_rcu(&leader->tasks, ¤t->tasks); current->group_leader = current; leader->group_leader = current; @@ -715,7 +715,6 @@ static int de_thread(struct task_struct *tsk) /* Reduce leader to a thread */ detach_pid(leader, PIDTYPE_PGID); detach_pid(leader, PIDTYPE_SID); - list_del_init(&leader->tasks); current->exit_signal = SIGCHLD; -- GitLab