Anjali K <anja...@linux.ibm.com> writes: > Hi Michael > > On 18/06/24 12:41, Michael Ellerman wrote: >> I guess there isn't a kmem_cache_create_user_readonly() ?
> Thank you for your review. > > My understanding of the question is whether there's a way to whitelist a > region such that it can be copied to userspace, but not written to using > copy_from_user(). Yes that's what I meant, and I pretty much worked that out from looking at the implementation, but was hoping Kees would tell me it was there somewhere, or implement it :) Apologies for being cryptic. > No, we don't have a function to whitelist only for copy_to_user() and not > copy_from_user(). Yep. I'll take this patch as-is, I think we've established that it's pretty low risk to whitelist the whole cache. cheers
