From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Sun, 27 Aug 2006 08:23:34 +0000 (-0700)
Subject: [PATCH] revert "Drop tasklist lock in do_sched_setscheduler"
X-Git-Tag: v2.6.18-rc5~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f8986c241dfd54d51c9eff967129a550ae230144;p=pandora-kernel.git

[PATCH] revert "Drop tasklist lock in do_sched_setscheduler"

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>
---

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