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Date: Tue, 6 Aug 2013 16:31:48 +0200
From: Petr Matousek <pmatouse@...hat.com>
To: security@...nel.org
Cc: oss-security@...ts.openwall.com
Subject: CLONE_NEWUSER local DoS

Hello,

spender reported [1] a local DoS triggerable by unprivileged user when
user namespaces are enabled (CONFIG_USER_NS).

  [1] https://twitter.com/grsecurity/status/364566062336978944

Reproducer:

b836010000bb00000010cd80ebf2 is for(;;)unshare(1<<28);

Best regards,
-- 
Petr Matousek / Red Hat Security Response Team

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