On Thu, Jul 12, 2018 at 08:33:24PM -0700, Kees Cook wrote: > On Thu, Jul 12, 2018 at 5:40 PM, Herbert Xu <herb...@gondor.apana.org.au> > wrote: > > On Thu, Jul 12, 2018 at 06:02:26PM +0200, Arnd Bergmann wrote: > >> > >> Looking through some of the drivers, I found this interesting one: > > > > As I said before these patches are fundamentally broken. Users > > of AHASH_REQUEST_ON_STACK can only use sync algorithm providers > > and therefore drivers are irrelevant. > > I don't understand what this means. Can you give an example of what > you want to see happen that will accomplish the VLA removals?
Any algorithm that is async must be ignored when you're calculating the maximum on-stack size of the request. For example, sha512-mb is marked as async and therefore must not be used in conjunction with AHASH_REQUEST_ON_STACK. Cheers, -- Email: Herbert Xu <herb...@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
