On Sat, Jan 4, 2020 at 7:50 AM Ilya Maximets <[email protected]> wrote:
>
> Most of callers doesn't initialize dpif_execute.hash leaving random
> value from the stack. And this random value used later while encoding
> netlink message and might produce unwanted kernel behavior.
>
> Fix that by fully initializing dpif_execute structure. Using
> designated initializers to avoid such issues in the future.
>
> Fixes: 0442bfb11d6c ("ofproto-dpif-upcall: Echo HASH attribute back to
> datapath.")
Hi, this patch is a bugfix for commit id 0442bfb11d6c? I think it
improves the codes.
> Signed-off-by: Ilya Maximets <[email protected]>
> ---
> ofproto/ofproto-dpif.c | 113 ++++++++++++++++++-----------------------
> 1 file changed, 50 insertions(+), 63 deletions(-)
>
> diff --git a/ofproto/ofproto-dpif.c b/ofproto/ofproto-dpif.c
> index b17c6cdca..d298e17cf 100644
> --- a/ofproto/ofproto-dpif.c
> +++ b/ofproto/ofproto-dpif.c
> @@ -1073,7 +1073,6 @@ check_masked_set_action(struct dpif_backer *backer)
> {
> struct eth_header *eth;
> struct ofpbuf actions;
> - struct dpif_execute execute;
> struct dp_packet packet;
> struct flow flow;
> int error;
> @@ -1098,14 +1097,13 @@ check_masked_set_action(struct dpif_backer *backer)
>
> /* Execute the actions. On older datapaths this fails with EINVAL, on
> * newer datapaths it succeeds. */
> - execute.actions = actions.data;
> - execute.actions_len = actions.size;
> - execute.packet = &packet;
> - execute.flow = &flow;
> - execute.needs_help = false;
> - execute.probe = true;
> - execute.mtu = 0;
> -
> + struct dpif_execute execute = {
> + .actions = actions.data,
> + .actions_len = actions.size,
> + .packet = &packet,
> + .flow = &flow,
> + .probe = true,
> + };
> error = dpif_execute(backer->dpif, &execute);
>
> dp_packet_uninit(&packet);
> @@ -1127,7 +1125,6 @@ check_trunc_action(struct dpif_backer *backer)
> {
> struct eth_header *eth;
> struct ofpbuf actions;
> - struct dpif_execute execute;
> struct dp_packet packet;
> struct ovs_action_trunc *trunc;
> struct flow flow;
> @@ -1152,14 +1149,13 @@ check_trunc_action(struct dpif_backer *backer)
>
> /* Execute the actions. On older datapaths this fails with EINVAL, on
> * newer datapaths it succeeds. */
> - execute.actions = actions.data;
> - execute.actions_len = actions.size;
> - execute.packet = &packet;
> - execute.flow = &flow;
> - execute.needs_help = false;
> - execute.probe = true;
> - execute.mtu = 0;
> -
> + struct dpif_execute execute = {
> + .actions = actions.data,
> + .actions_len = actions.size,
> + .packet = &packet,
> + .flow = &flow,
> + .probe = true,
> + };
> error = dpif_execute(backer->dpif, &execute);
>
> dp_packet_uninit(&packet);
> @@ -1181,7 +1177,6 @@ check_trunc_action(struct dpif_backer *backer)
> static bool
> check_clone(struct dpif_backer *backer)
> {
> - struct dpif_execute execute;
> struct eth_header *eth;
> struct flow flow;
> struct dp_packet packet;
> @@ -1204,14 +1199,13 @@ check_clone(struct dpif_backer *backer)
>
> /* Execute the actions. On older datapaths this fails with EINVAL, on
> * newer datapaths it succeeds. */
> - execute.actions = actions.data;
> - execute.actions_len = actions.size;
> - execute.packet = &packet;
> - execute.flow = &flow;
> - execute.needs_help = false;
> - execute.probe = true;
> - execute.mtu = 0;
> -
> + struct dpif_execute execute = {
> + .actions = actions.data,
> + .actions_len = actions.size,
> + .packet = &packet,
> + .flow = &flow,
> + .probe = true,
> + };
> error = dpif_execute(backer->dpif, &execute);
>
> dp_packet_uninit(&packet);
> @@ -1233,7 +1227,6 @@ check_clone(struct dpif_backer *backer)
> static bool
> check_ct_eventmask(struct dpif_backer *backer)
> {
> - struct dpif_execute execute;
> struct dp_packet packet;
> struct ofpbuf actions;
> struct flow flow = {
> @@ -1266,14 +1259,13 @@ check_ct_eventmask(struct dpif_backer *backer)
>
> /* Execute the actions. On older datapaths this fails with EINVAL, on
> * newer datapaths it succeeds. */
> - execute.actions = actions.data;
> - execute.actions_len = actions.size;
> - execute.packet = &packet;
> - execute.flow = &flow;
> - execute.needs_help = false;
> - execute.probe = true;
> - execute.mtu = 0;
> -
> + struct dpif_execute execute = {
> + .actions = actions.data,
> + .actions_len = actions.size,
> + .packet = &packet,
> + .flow = &flow,
> + .probe = true,
> + };
> error = dpif_execute(backer->dpif, &execute);
>
> dp_packet_uninit(&packet);
> @@ -1328,7 +1320,6 @@ check_ct_clear(struct dpif_backer *backer)
> static bool
> check_ct_timeout_policy(struct dpif_backer *backer)
> {
> - struct dpif_execute execute;
> struct dp_packet packet;
> struct ofpbuf actions;
> struct flow flow = {
> @@ -1361,14 +1352,13 @@ check_ct_timeout_policy(struct dpif_backer *backer)
>
> /* Execute the actions. On older datapaths this fails with EINVAL, on
> * newer datapaths it succeeds. */
> - execute.actions = actions.data;
> - execute.actions_len = actions.size;
> - execute.packet = &packet;
> - execute.flow = &flow;
> - execute.needs_help = false;
> - execute.probe = true;
> - execute.mtu = 0;
> -
> + struct dpif_execute execute = {
> + .actions = actions.data,
> + .actions_len = actions.size,
> + .packet = &packet,
> + .flow = &flow,
> + .probe = true,
> + };
> error = dpif_execute(backer->dpif, &execute);
>
> dp_packet_uninit(&packet);
> @@ -1480,7 +1470,6 @@ check_nd_extensions(struct dpif_backer *backer)
> {
> struct eth_header *eth;
> struct ofpbuf actions;
> - struct dpif_execute execute;
> struct dp_packet packet;
> struct flow flow;
> int error;
> @@ -1500,14 +1489,13 @@ check_nd_extensions(struct dpif_backer *backer)
> flow_extract(&packet, &flow);
>
> /* Execute the actions. On datapaths without support fails with EINVAL.
> */
> - execute.actions = actions.data;
> - execute.actions_len = actions.size;
> - execute.packet = &packet;
> - execute.flow = &flow;
> - execute.needs_help = false;
> - execute.probe = true;
> - execute.mtu = 0;
> -
> + struct dpif_execute execute = {
> + .actions = actions.data,
> + .actions_len = actions.size,
> + .packet = &packet,
> + .flow = &flow,
> + .probe = true,
> + };
> error = dpif_execute(backer->dpif, &execute);
>
> dp_packet_uninit(&packet);
> @@ -4160,7 +4148,6 @@ ofproto_dpif_execute_actions__(struct ofproto_dpif
> *ofproto,
> struct dpif_flow_stats stats;
> struct xlate_out xout;
> struct xlate_in xin;
> - struct dpif_execute execute;
> int error;
>
> ovs_assert((rule != NULL) != (ofpacts != NULL));
> @@ -4185,15 +4172,15 @@ ofproto_dpif_execute_actions__(struct ofproto_dpif
> *ofproto,
> goto out;
> }
>
> - execute.actions = odp_actions.data;
> - execute.actions_len = odp_actions.size;
> -
> pkt_metadata_from_flow(&packet->md, flow);
> - execute.packet = packet;
> - execute.flow = flow;
> - execute.needs_help = (xout.slow & SLOW_ACTION) != 0;
> - execute.probe = false;
> - execute.mtu = 0;
> +
> + struct dpif_execute execute = {
> + .actions = odp_actions.data,
> + .actions_len = odp_actions.size,
> + .packet = packet,
> + .flow = flow,
> + .needs_help = (xout.slow & SLOW_ACTION) != 0,
> + };
>
> /* Fix up in_port. */
> ofproto_dpif_set_packet_odp_port(ofproto, flow->in_port.ofp_port,
> packet);
> --
> 2.17.1
>
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