On Sun, Nov 09, 2014 at 11:33:52PM +0100, Stephan Mueller wrote: > > while working on the AF_ALG interface, I saw no active zeroizations of memory > that may hold sensitive data that is maintained outside the kernel crypto API > cipher handles. I think the following memory segments fall under that > category:
Are you talking about temporary data that we generate as part of the processing? If so they should be zeroed by the entity that generates them. > However, I am failing to find the right spot to add a zeroization for the > latter one, i.e. the code that handles the pages send in by the user or the > pages that are returned by the crypto API. Initially I thought > skcipher_pull_sgl is a good spot for the symmetric ciphers as it evicts the > used pages out of the scope of the kernel crypto API. I added a > clear_page(sg_page(sg+1)) as well as memset(sg_page(sg+1), 0, plen) right > before the put_page call. All that I got in return was a BUG() from the > memory > management layer. I don't think I understand what exactly you're trying to zero. Can you give an example? Thanks, -- 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-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
