Am Montag, 5. Januar 2015, 21:31:59 schrieb Herbert Xu:
Hi Herbert,
> On Fri, Jan 02, 2015 at 03:41:33PM +0100, Stephan Mueller wrote:
> > + if (!con.aead_assoclen)
> > + return -EINVAL;
>
> AD being zero should be fine.
Ok, removed.
>
> > + /* aead_recvmsg limits the maximum AD size to one page */
> > + if (con.aead_assoclen > PAGE_SIZE)
> > + return -E2BIG;
>
> I don't see any need to limit the size of the AD.
The need for that check lies in aead_recvmsg:
/*
* first chunk of input is AD -- one scatterlist entry is one page,
* and we process only one scatterlist, the maximum size of AD is
* one page
*/
sg_init_table(&assoc, 1);
sg_set_page(&assoc, sg_page(sg), ctx->aead_assoclen, sg->offset);
aead_request_set_assoc(&ctx->aead_req, &assoc, ctx->aead_assoclen);
There you see that I only create an sg table with one entry for the AD. If we
would allow an arbitrary AD size, I would see the need of a for loop in
addition to the one directly beneath this AD scatterlist setting: one for
identifying how many sg entries I need to allocate and one for the actual
assignment.
As I felt that one page should be sufficient for the AD, I wanted to avoid the
extra overhead for another for loop.
>
> Cheers,
--
Ciao
Stephan
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