On Mon, Jul 03, 2023 at 07:19:00PM +0100, szabolcs.nagy@arm.com wrote:

The 07/02/2023 18:03, Edgecombe, Rick P wrote:

quoted

3. Support more options for shadow stack sizing. (I think you are
referring to this conversation:
https://lore.kernel.org/lkml/ZAIgrXQ4670gxlE4@arm.com/ (local)). I don't see
why this is needed for the base implementation. If ARM wants to add a
new rlimit or clone variant, I don't see why x86 can't support it
later.

i think it can be added later.

but it may be important for deployment on some platforms, since a
libc (or other language runtime) may want to set the shadow stack
size differently than the kernel default, because

I agree that this can be deferred to later, so long as we err on the
side of large stacks now we can provide an additional limit without
confusing things.