CVE-2010-1488

First published: Wed Apr 14 2010(Updated: )

Description of problem: proc_oom_score(task) has a reference to task_struct, but that is all. If this task was already released before we take tasklist_lock - we can't use task-&gt;group_leader, it points to nowhere - it is not safe to call badness() even if this task is -&gt;group_leader, has_intersects_mems_allowed() assumes it is safe to iterate over -&gt;thread_group list. - even worse, badness() can hit -&gt;signal == NULL Add the pid_alive() check to ensure __unhash_process() was not called. Also, use "task" instead of task-&gt;group_leader. badness() should return the same result for any sub-thread. Currently this is not true, but this should be changed anyway. Upstream commit: <a href="http://git.kernel.org/linus/b95c35e76b29ba812e5dabdd91592e25ec640e93">http://git.kernel.org/linus/b95c35e76b29ba812e5dabdd91592e25ec640e93</a>

Credit: cve@mitre.org cve@mitre.org

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