Deny CLONE_PARENT|CLONE_NEWPID|CLONE_SIGHAND combination.
CLONE_PARENT was used to implement an older threading model. For consistency
with the CLONE_THREAD check in copy_pid_ns(), disable CLONE_PARENT and
CLONE_SIGHAND with CLONE_NEWPID, at least until the required semantics of
the pid namespaces are clear.
Changelog[v2]:
[Eric Biederman] Disable CLONE_SIGHAND also ???
Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxx>
Acked-by: Roland McGrath <roland@xxxxxxxxxx>
---
kernel/pid_namespace.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux-mmotm/kernel/pid_namespace.c
===================================================================
--- linux-mmotm.orig/kernel/pid_namespace.c 2009-06-30 23:01:09.000000000 -0700
+++ linux-mmotm/kernel/pid_namespace.c 2009-06-30 23:49:06.000000000 -0700
@@ -118,7 +118,7 @@ struct pid_namespace *copy_pid_ns(unsign
{
if (!(flags & CLONE_NEWPID))
return get_pid_ns(old_ns);
- if (flags & CLONE_THREAD)
+ if (flags & (CLONE_THREAD|CLONE_PARENT|CLONE_SIGHAND))
return ERR_PTR(-EINVAL);
return create_pid_namespace(old_ns);
}
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