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authorEric W. Biederman <ebiederm@xmission.com>2012-08-02 08:35:35 -0700
committerEric W. Biederman <ebiederm@xmission.com>2012-11-19 05:59:13 -0800
commit225778d68d98e7cfe2579f8d8b2d7b76f8541b8b (patch)
treed4bc4b78c3e19821eaaffacc5341d02328bcd3c9 /fs/proc/namespaces.c
parentaf4b8a83add95ef40716401395b44a1b579965f4 (diff)
downloadlinux-stericsson-225778d68d98e7cfe2579f8d8b2d7b76f8541b8b.tar.gz
pidns: Deny strange cases when creating pid namespaces.
task_active_pid_ns(current) != current->ns_proxy->pid_ns will soon be allowed to support unshare and setns. The definition of creating a child pid namespace when task_active_pid_ns(current) != current->ns_proxy->pid_ns could be that we create a child pid namespace of current->ns_proxy->pid_ns. However that leads to strange cases like trying to have a single process be init in multiple pid namespaces, which is racy and hard to think about. The definition of creating a child pid namespace when task_active_pid_ns(current) != current->ns_proxy->pid_ns could be that we create a child pid namespace of task_active_pid_ns(current). While that seems less racy it does not provide any utility. Therefore define the semantics of creating a child pid namespace when task_active_pid_ns(current) != current->ns_proxy->pid_ns to be that the pid namespace creation fails. That is easy to implement and easy to think about. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/proc/namespaces.c')
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