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pidns: deny CLONE_PARENT|CLONE_NEWPID combination

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CLONE_PARENT was used to implement an older threading model.  For
consistency with the CLONE_THREAD check in copy_pid_ns(), disable
CLONE_PARENT with CLONE_NEWPID, at least until the required semantics of
pid namespaces are clear.

Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Acked-by: Roland McGrath <roland@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Oren Laadan <orenl@cs.columbia.edu>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sukadev Bhattiprolu 2009-09-23 15:57:22 -07:00 committed by Linus Torvalds
parent 123be07b0b
commit e5a4738699
1 changed files with 1 additions and 1 deletions
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2
kernel/pid_namespace.c
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@ -118,7 +118,7 @@ struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *old
{ {
if (!(flags & CLONE_NEWPID)) if (!(flags & CLONE_NEWPID))
return get_pid_ns(old_ns); return get_pid_ns(old_ns);
if (flags & CLONE_THREAD) if (flags & (CLONE_THREAD|CLONE_PARENT))
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
return create_pid_namespace(old_ns); return create_pid_namespace(old_ns);
} }