On Wed, Dec 6, 2017 at 3:21 PM, Kees Cook <keesc...@chromium.org> wrote: > On Wed, Dec 6, 2017 at 2:31 AM, David Laight <david.lai...@aculab.com> wrote: >> >> I can also image issues where you want to know whether 2 pointers point >> into the same structure (like an skb). > > This is already retained due to the hashing. i.e. the same pointer > value will produce the same hash value, so that kind of direct > comparison still works.
DavidL isn't talking about the _same_ pointer, he's talking about it being offset from the same base. But realistically, I don't think we ever hash things like that anyway. Things like that do show up in register dumps etc during oopses, but those aren't hashed. Linus