On Tue, Jul 10, 2018 at 05:57:00PM +0200, Stephan Müller wrote: > The SGL can directly operate caller-provided memory with the exception > of stack memory. The DRBG detects whether the caller provided > non-suitable memory and uses the scratchpad only on those circumstances. > > This patch increases the speed of the CTR DRBG by 1 to 3 percent > depending on the buffer size of the output buffer. > > Signed-off-by: Stephan Mueller <smueller@xxxxxxxxxx> I think this is an abuse of virt_addr_valid. It's meant to catch bogus uses of SG lists, it's not meant to be a guarantee that an address can be used on an SG list. A better solution would be either an SG-list interface for rng, or alternatively a virtual address interface for sync skcipher. Cheers, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
