On Wed, May 02, 2018 at 01:37:44PM +0800, Xin Long wrote:
> When processing a duplicate cookie-echo chunk, for case 'A' and 'B',
> after sctp_process_init for the new asoc, if auth is enabled for the
> cookie-ack chunk, the active key should also be initialized.
>
> Otherwise, the cookie-ack chunk made later can not be set with auth
> shkey properly, and a crash can even be caused by this, as after
> Commit 1b1e0bc99474 ("sctp: add refcnt support for sh_key"), sctp
> needs to hold the shkey when making control chunks.
>
> Fixes: 1b1e0bc99474 ("sctp: add refcnt support for sh_key")
> Reported-by: Jianwen Ji <jiji@xxxxxxxxxx>
> Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
> ---
> net/sctp/sm_statefuns.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> index dd0594a..98acfed 100644
> --- a/net/sctp/sm_statefuns.c
> +++ b/net/sctp/sm_statefuns.c
> @@ -1794,6 +1794,9 @@ static enum sctp_disposition sctp_sf_do_dupcook_a(
> GFP_ATOMIC))
> goto nomem;
>
> + if (sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC))
> + goto nomem;
> +
> /* Make sure no new addresses are being added during the
> * restart. Though this is a pretty complicated attack
> * since you'd have to get inside the cookie.
> @@ -1906,6 +1909,9 @@ static enum sctp_disposition sctp_sf_do_dupcook_b(
> GFP_ATOMIC))
> goto nomem;
>
> + if (sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC))
> + goto nomem;
> +
> /* Update the content of current association. */
> sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc));
> sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
> --
> 2.1.0
>
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