Date: Fri, 17 Apr 2009 16:58:09 +0800 From: Eugene Teo <eugene@...hat.com> To: oss-security@...ts.openwall.com CC: "Steven M. Christey" <coley@...us.mitre.org> Subject: Re: CVE request: kernel: 'kill sig -1' must only apply to caller's PID namespace Eugene Teo wrote: > I came across this while reviewing some older upstream patches. > > Apparently, it was possible to run kill <sig> -1 to kill processes in > all PID namespaces, and break the isolation of namespaces. The expected > behaviour for this is to only kill processes in its own hierarchy. The > fix uses task_pid_vnr() to check if the process is outside of the > caller's namespace before killing. I am still able to reproduce the problem even after applying this upstream patch (commit d25141a8). I'm still figuring out what other patches are needed. If you know which ones, do let us know. The expected behaviour for this is: # ps -e PID TTY TIME CMD 1 pts/0 00:00:00 bash <-- this namespace's "init" 10 pts/0 00:00:00 ps # /bin/kill -s SIGKILL -1 kill -1: No such process Take note that you need to be privileged in order to create a new PID namespace, but to be able to kill other invisible processes outside of the namespace is a bypass of the intended namespaces isolation. Thanks, Eugene -- Eugene Teo / Red Hat Security Response Team
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