Re: [PATCH] Add a text_poke syscall v2

Andy Lutomirski
2013-11-27T22:21:26Z

On Wed, Nov 27, 2013 at 2:02 PM, H. Peter Anvin <hpa@zytor.com> wrote:
> For the record, this is the entire patch necessary to do the
> sync_cores() system call -- and no potential interactions with security
> frameworks or whatnot, simply because no security-sensitive operations
> are performed of any kind.
>
> Comments/opinions appreciated.

Presumably, if this were done, it should be merged with the
sys_membarrier work. Maybe there should be a syscall for executing
some kind of barrier on all cpus that might be looking at the current
mm (and, eventually, something for MAP_SHARED as well if anyone
cares).

A benefit of the explicit text_poke approach is that it can
potentially get MAP_SHARED patching right. I don't know if anyone
would ever want to do that, though.

--Andy