On Sat, Oct 10, 2015 at 05:52:29PM +0100, Russell King - ARM Linux wrote: > > If you're using AF_ALG, and you attach to (say) the ARM Neon SHA512 > implementation through it, and then use accept() to duplicate it's > state, what prevents the kernel from oopsing when hash_accept() calls > crypto_ahash_export(), which then dereferences the NULL alg->export > function pointer?
After reading the code I don't think you can actually trigger a NULL dereference since the crypto API will provide a default import and export function that just returns ENOSYS. Having said that, not having an import/export function means that algif_hash may not work correctly so they should be provided by the driver. 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 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
