Date: Wed, 22 Jun 2011 11:17:07 +0400 From: Vasiliy Kulikov <segoon@...nwall.com> To: oss-security@...ts.openwall.com Subject: CVE request: kernel: taskstats local DoS "Currently a single process may register exit handlers unlimited times. It may lead to a bloated listeners chain and very slow process terminations. E.g. after 10KK sent TASKSTATS_CMD_ATTR_REGISTER_CPUMASKs ~300 Mb of kernel memory is stolen for the handlers chain and "time id" shows 2-7 seconds instead of normal 0.003. It makes it possible to exhaust all kernel memory and to eat much of CPU time by triggerring numerous exits on a single CPU. The patch limits the number of times a single process may register itself on a single CPU to one." It makes it possible for unprivileged user eat kernel memory and CPU without triggering OOM killer. Was introduced in f9fd8914c1acca0d98b69d831b128d5b52f03c51. http://lists.openwall.net/linux-kernel/2011/06/16/605 Thanks, -- Vasiliy Kulikov http://www.openwall.com - bringing security into open computing environments
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