Re: [RFC][PATCH v2 3/5] clone: Disallown CLONE_THREAD with a shared sighand_struct

On 04/05, Eric W. Biederman wrote:

Oleg Nesterov [off-list ref] writes:

I agree that changing userspace semantics is something to be very
careful with.  But at least for purposes of discussion I think this is a
good patch.

I agree that we need it with your approach,

but imo it would be much better to not depend on the subtle changes
like this. My 2/2 or your 1/5 are already bad enough.

I can avoid this change but it requires moving sighand->siglock
into signal_struct and introducing a new spinlock into sighand_struct
to just guard the signal handlers.

Oh, this looks much, much worse to me.

Oleg.