Re: [PATCH] autofs4: fix 32-bit userspace vs 64-bit kernel communications

[Pavel Emelyanov <xemul@openvz.org>]

> Does the test_thread_flag(TIF_IA32) macro only return true for a 32-bit
> user-space process running within a 64-bit user space environment
> (perhaps I can do away with the check in the autofs daemon, perhaps it
> doesn't quite work correctly)?

Hm... If we fix it in the user level that would also be OK, I
suppose...

> Oh .. so maybe the answer to my question is yes?

It is - we check *only* for the process, that is to receive the 
packet.

> What about other arches offer 32-bit within a 64-bit environment (has
> this been the case on sparc64 at some point)?
> What about the compiler padding on these?

We have no technical ability to check this. First I wanted to
get your opinion about this particular fix for x86 machines.

As far as sparc(64) and other 32-to-64 are concerned - I can
start talking to their users/maintainers to check.

> Don't get me wrong, I'm not against fixing this, in fact I'd like to,
> but I'm concerned it may end up a bit of a can of worms.