From: Jiri Slaby <jirislaby@gmail.com>
Date: Fri, 28 Aug 2009 12:08:17 +0000 (+0200)
Subject: rlimits: allow setrlimit to non-current tasks
X-Git-Tag: v2.6.36-rc1~300^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c1e618ddd15f69fd87ccea596769f78c8065504;p=pandora-kernel.git

rlimits: allow setrlimit to non-current tasks

Add locking to allow setrlimit accept task parameter other than
current.

Namely, lock tasklist_lock for read and check whether the task
structure has sighand non-null. Do all the signal processing under
that lock still held.

There are some points:
1) security_task_setrlimit is now called with that lock held. This is
   not new, many security_* functions are called with this lock held
   already so it doesn't harm (all this security_* stuff does almost
   the same).
2) task->sighand->siglock (in update_rlimit_cpu) is nested in
   tasklist_lock. This dependence is already existing.
3) tsk->alloc_lock is nested in tasklist_lock. This is OK too, already
   existing dependence.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
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