On Fri, 2016-03-18 at 22:42 +0800, Herbert Xu wrote:
> This bug has already bee fixed upstream since 4.2. However, it
> was fixed during the AEAD conversion so no fix was backported to
> the older kernels.
>
> When we do an RFC 4543 decryption, we will end up writing the
> ICV beyond the end of the dst buffer. This should lead to a
> crash but for some reason it was never noticed.
>
> This patch fixes it by only writing back the ICV for encryption.
>
> Fixes: d733ac90f9fe ("crypto: gcm - fix rfc4543 to handle async...")
> Reported-by: Patrick Meyer <patrick.meyer@xxxxxxxxxxx>
> Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Queued up for 3.16, thanks.
Ben.
>
> diff --git a/crypto/gcm.c b/crypto/gcm.c
> index b4c2520..cd97cdd 100644
> --- a/crypto/gcm.c
> +++ b/crypto/gcm.c
> @@ -1173,6 +1173,9 @@ static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
> aead_request_set_tfm(subreq, ctx->child);
> aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done,
> req);
> + if (!enc)
> + aead_request_set_callback(subreq, req->base.flags,
> + req->base.complete, req->base.data);
> aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
> aead_request_set_assoc(subreq, assoc, assoclen);
>
--
Ben Hutchings
The generation of random numbers is too important to be left to chance.
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