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[PATCH] revert "Drop tasklist lock in do_sched_setscheduler"

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sched_setscheduler() looks at ->signal->rlim[].  It is unsafe do
dereference ->signal unless tasklist_lock or ->siglock is held (or p ==
current).  We pin the task structure, but this can't prevent from
release_task()->__exit_signal() which sets ->signal = NULL.

Restore tasklist_lock across the setscheduler call.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov 2006-08-27 01:23:34 -07:00 committed by Linus Torvalds
parent cb3e0fe3a5
commit f8986c241d
1 changed files with 1 additions and 3 deletions
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4
kernel/sched.c
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@ -4162,10 +4162,8 @@ do_sched_setscheduler(pid_t pid, int policy, struct sched_param __user *param)
read_unlock_irq(&tasklist_lock);
return -ESRCH;
}
get_task_struct(p);
read_unlock_irq(&tasklist_lock);
retval = sched_setscheduler(p, policy, &lparam);
put_task_struct(p);
read_unlock_irq(&tasklist_lock);
return retval;
}