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[209.132.180.67]) by mx.google.com with ESMTP id x37-v6si13356431pgl.544.2018.08.26.15.59.07; Sun, 26 Aug 2018 15:59:25 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727067AbeH0Clv (ORCPT + 99 others); Sun, 26 Aug 2018 22:41:51 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:40382 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726886AbeH0Clv (ORCPT ); Sun, 26 Aug 2018 22:41:51 -0400 Received: from viro by ZenIV.linux.org.uk with local (Exim 4.87 #1 (Red Hat Linux)) id 1fu3yf-0006Kb-E4; Sun, 26 Aug 2018 22:57:49 +0000 Date: Sun, 26 Aug 2018 23:57:49 +0100 From: Al Viro To: Kees Cook Cc: LKML , Jamal Hadi Salim , Cong Wang , Jiri Pirko , "David S. Miller" , Network Development Subject: Re: [PATCH] net: sched: Fix memory exposure from short TCA_U32_SEL Message-ID: <20180826225749.GY6515@ZenIV.linux.org.uk> References: <20180826055801.GA42063@beast> <20180826061534.GT6515@ZenIV.linux.org.uk> <20180826173236.GU6515@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180826173236.GU6515@ZenIV.linux.org.uk> User-Agent: Mutt/1.9.1 (2017-09-22) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Aug 26, 2018 at 06:32:37PM +0100, Al Viro wrote: > As far as I can tell, the solution is [snip long and painful reasoning] > pointers, and not in provably opaque fashion. Theoretically, the three tcf_... > inlines above need another look; fortunately, they don't use ->next at all, not to > mention not being used anywhere outside of net/sched/*.c > > The 80 lines above prove that we only need to grep net/sched/*.c for > tcf_proto_ops method calls. And only because we don't have (thank $DEITY) > anything that could deconstruct types - as soon as some bastard grows means > to say "type of the second argument of the function pointed to by p", this > kind of analysis, painful as it is, goes out of window. Even as it is, > do you really like the idea of newbies trying to get through the exercises > like the one above? BTW, would there be any problem if we took the definitions of tcf_proto and tcf_proto_ops to e.g. net/sched/tcf_proto.h (along with the three inlines in in pkt_cls.h), left forwards in sch_generic.h and added includes of "tcf_proto.h" where needed in net/sched/*.c? That would make tcf_proto/tcf_proto_ops opaque outside of net/sched, reducing the exposure of internals. Something like a diff below (against net/master, builds clean, ought to result in identical binary): diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h index ef727f71336e..35f8eec3f7c0 100644 --- a/include/net/pkt_cls.h +++ b/include/net/pkt_cls.h @@ -217,35 +217,6 @@ cls_set_class(struct Qdisc *q, unsigned long *clp, unsigned long cl) return old_cl; } -static inline void -tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base) -{ - struct Qdisc *q = tp->chain->block->q; - unsigned long cl; - - /* Check q as it is not set for shared blocks. In that case, - * setting class is not supported. - */ - if (!q) - return; - cl = q->ops->cl_ops->bind_tcf(q, base, r->classid); - cl = cls_set_class(q, &r->class, cl); - if (cl) - q->ops->cl_ops->unbind_tcf(q, cl); -} - -static inline void -tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r) -{ - struct Qdisc *q = tp->chain->block->q; - unsigned long cl; - - if (!q) - return; - if ((cl = __cls_set_class(&r->class, 0)) != 0) - q->ops->cl_ops->unbind_tcf(q, cl); -} - struct tcf_exts { #ifdef CONFIG_NET_CLS_ACT __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ @@ -708,18 +679,6 @@ static inline bool tc_in_hw(u32 flags) return (flags & TCA_CLS_FLAGS_IN_HW) ? true : false; } -static inline void -tc_cls_common_offload_init(struct tc_cls_common_offload *cls_common, - const struct tcf_proto *tp, u32 flags, - struct netlink_ext_ack *extack) -{ - cls_common->chain_index = tp->chain->index; - cls_common->protocol = tp->protocol; - cls_common->prio = tp->prio; - if (tc_skip_sw(flags) || flags & TCA_CLS_FLAGS_VERBOSE) - cls_common->extack = extack; -} - enum tc_fl_command { TC_CLSFLOWER_REPLACE, TC_CLSFLOWER_DESTROY, diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index a6d00093f35e..72dbb96fc549 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -246,65 +246,7 @@ struct tcf_result { struct tcf_chain; -struct tcf_proto_ops { - struct list_head head; - char kind[IFNAMSIZ]; - - int (*classify)(struct sk_buff *, - const struct tcf_proto *, - struct tcf_result *); - int (*init)(struct tcf_proto*); - void (*destroy)(struct tcf_proto *tp, - struct netlink_ext_ack *extack); - - void* (*get)(struct tcf_proto*, u32 handle); - int (*change)(struct net *net, struct sk_buff *, - struct tcf_proto*, unsigned long, - u32 handle, struct nlattr **, - void **, bool, - struct netlink_ext_ack *); - int (*delete)(struct tcf_proto *tp, void *arg, - bool *last, - struct netlink_ext_ack *); - void (*walk)(struct tcf_proto*, struct tcf_walker *arg); - int (*reoffload)(struct tcf_proto *tp, bool add, - tc_setup_cb_t *cb, void *cb_priv, - struct netlink_ext_ack *extack); - void (*bind_class)(void *, u32, unsigned long); - void * (*tmplt_create)(struct net *net, - struct tcf_chain *chain, - struct nlattr **tca, - struct netlink_ext_ack *extack); - void (*tmplt_destroy)(void *tmplt_priv); - - /* rtnetlink specific */ - int (*dump)(struct net*, struct tcf_proto*, void *, - struct sk_buff *skb, struct tcmsg*); - int (*tmplt_dump)(struct sk_buff *skb, - struct net *net, - void *tmplt_priv); - - struct module *owner; -}; - -struct tcf_proto { - /* Fast access part */ - struct tcf_proto __rcu *next; - void __rcu *root; - - /* called under RCU BH lock*/ - int (*classify)(struct sk_buff *, - const struct tcf_proto *, - struct tcf_result *); - __be16 protocol; - - /* All the rest */ - u32 prio; - void *data; - const struct tcf_proto_ops *ops; - struct tcf_chain *chain; - struct rcu_head rcu; -}; +struct tcf_proto_ops; struct qdisc_skb_cb { unsigned int pkt_len; diff --git a/net/sched/act_api.c b/net/sched/act_api.c index 229d63c99be2..e946ada18299 100644 --- a/net/sched/act_api.c +++ b/net/sched/act_api.c @@ -25,11 +25,12 @@ #include #include #include -#include #include #include #include +#include "tcf_proto.h" + static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp) { u32 chain_index = a->tcfa_action & TC_ACT_EXT_VAL_MASK; diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index 31bd1439cf60..be5fba6355c5 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -31,6 +31,8 @@ #include #include +#include "tcf_proto.h" + /* The list of all installed classifier types */ static LIST_HEAD(tcf_proto_base); diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c index 6a5dce8baf19..3772432889f2 100644 --- a/net/sched/cls_basic.c +++ b/net/sched/cls_basic.c @@ -22,6 +22,8 @@ #include #include +#include "tcf_proto.h" + struct basic_head { struct list_head flist; struct idr handle_idr; diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c index fa6fe2fe0f32..fb2478e357cd 100644 --- a/net/sched/cls_bpf.c +++ b/net/sched/cls_bpf.c @@ -23,6 +23,8 @@ #include #include +#include "tcf_proto.h" + MODULE_LICENSE("GPL"); MODULE_AUTHOR("Daniel Borkmann "); MODULE_DESCRIPTION("TC BPF based classifier"); diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c index 3bc01bdde165..5638c711e53c 100644 --- a/net/sched/cls_cgroup.c +++ b/net/sched/cls_cgroup.c @@ -18,6 +18,8 @@ #include #include +#include "tcf_proto.h" + struct cls_cgroup_head { u32 handle; struct tcf_exts exts; diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c index 2bb043cd436b..7e60e432e3a8 100644 --- a/net/sched/cls_flow.c +++ b/net/sched/cls_flow.c @@ -33,6 +33,8 @@ #include #endif +#include "tcf_proto.h" + struct flow_head { struct list_head filters; struct rcu_head rcu; diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c index 6fd9bdd93796..b36c61f7ee44 100644 --- a/net/sched/cls_flower.c +++ b/net/sched/cls_flower.c @@ -20,7 +20,6 @@ #include #include -#include #include #include #include @@ -29,6 +28,8 @@ #include #include +#include "tcf_proto.h" + struct fl_flow_key { int indev_ifindex; struct flow_dissector_key_control control; diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c index 29eeeaf3ea44..be872b1653f5 100644 --- a/net/sched/cls_fw.c +++ b/net/sched/cls_fw.c @@ -28,7 +28,8 @@ #include #include #include -#include + +#include "tcf_proto.h" #define HTSIZE 256 diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c index 856fa79d4ffd..708faf62ecab 100644 --- a/net/sched/cls_matchall.c +++ b/net/sched/cls_matchall.c @@ -13,9 +13,10 @@ #include #include -#include #include +#include "tcf_proto.h" + struct cls_mall_head { struct tcf_exts exts; struct tcf_result res; diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c index 0404aa5fa7cb..d40ae6d14b2d 100644 --- a/net/sched/cls_route.c +++ b/net/sched/cls_route.c @@ -22,6 +22,8 @@ #include #include +#include "tcf_proto.h" + /* * 1. For now we assume that route tags < 256. * It allows to use direct table lookups, instead of hash tables. diff --git a/net/sched/cls_rsvp.c b/net/sched/cls_rsvp.c index cbb5e0d600f3..131a81aeaa4e 100644 --- a/net/sched/cls_rsvp.c +++ b/net/sched/cls_rsvp.c @@ -20,6 +20,8 @@ #include #include +#include "tcf_proto.h" + #define RSVP_DST_LEN 1 #define RSVP_ID "rsvp" #define RSVP_OPS cls_rsvp_ops diff --git a/net/sched/cls_rsvp6.c b/net/sched/cls_rsvp6.c index dd08aea2aee5..159dc01cf251 100644 --- a/net/sched/cls_rsvp6.c +++ b/net/sched/cls_rsvp6.c @@ -20,6 +20,8 @@ #include #include +#include "tcf_proto.h" + #define RSVP_DST_LEN 4 #define RSVP_ID "rsvp6" #define RSVP_OPS cls_rsvp6_ops diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c index 9ccc93f257db..e7d06c3d40a3 100644 --- a/net/sched/cls_tcindex.c +++ b/net/sched/cls_tcindex.c @@ -13,7 +13,8 @@ #include #include #include -#include + +#include "tcf_proto.h" /* * Passing parameters to the root seems to be done more awkwardly than really diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c index d5d2a6dc3921..7b3bdfd80001 100644 --- a/net/sched/cls_u32.c +++ b/net/sched/cls_u32.c @@ -47,6 +47,8 @@ #include #include +#include "tcf_proto.h" + struct tc_u_knode { struct tc_u_knode __rcu *next; u32 handle; diff --git a/net/sched/ematch.c b/net/sched/ematch.c index 1331a4c2d8ff..b123880fbe07 100644 --- a/net/sched/ematch.c +++ b/net/sched/ematch.c @@ -90,6 +90,8 @@ #include #include +#include "tcf_proto.h" + static LIST_HEAD(ematch_ops); static DEFINE_RWLOCK(ematch_mod_lock); diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 98541c6399db..d6ac218811d0 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -37,6 +37,8 @@ #include #include +#include "tcf_proto.h" + /* Short review. diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c index cd49afca9617..6bf259e55319 100644 --- a/net/sched/sch_atm.c +++ b/net/sched/sch_atm.c @@ -17,6 +17,8 @@ #include #include +#include "tcf_proto.h" + /* * The ATM queuing discipline provides a framework for invoking classifiers * (aka "filters"), which in turn select classes of this queuing discipline. diff --git a/net/sched/sch_cake.c b/net/sched/sch_cake.c index 35fc7252187c..fcfd5f321447 100644 --- a/net/sched/sch_cake.c +++ b/net/sched/sch_cake.c @@ -75,6 +75,8 @@ #include #endif +#include "tcf_proto.h" + #define CAKE_SET_WAYS (8) #define CAKE_MAX_TINS (8) #define CAKE_QUEUES (1024) diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c index f42025d53cfe..8021ba377dfd 100644 --- a/net/sched/sch_cbq.c +++ b/net/sched/sch_cbq.c @@ -21,6 +21,8 @@ #include #include +#include "tcf_proto.h" + /* Class-Based Queueing (CBQ) algorithm. ======================================= diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c index e0b0cf8a9939..19a48fa95b9b 100644 --- a/net/sched/sch_drr.c +++ b/net/sched/sch_drr.c @@ -18,6 +18,8 @@ #include #include +#include "tcf_proto.h" + struct drr_class { struct Qdisc_class_common common; unsigned int filter_cnt; diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c index 049714c57075..b3a4537afbcb 100644 --- a/net/sched/sch_dsmark.c +++ b/net/sched/sch_dsmark.c @@ -18,6 +18,8 @@ #include #include +#include "tcf_proto.h" + /* * classid class marking * ------- ----- ------- diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c index 6c0a9d5dbf94..8868a8e1a81f 100644 --- a/net/sched/sch_fq_codel.c +++ b/net/sched/sch_fq_codel.c @@ -28,6 +28,8 @@ #include #include +#include "tcf_proto.h" + /* Fair Queue CoDel. * * Principles : diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c index 3278a76f6861..9c75b77da56e 100644 --- a/net/sched/sch_hfsc.c +++ b/net/sched/sch_hfsc.c @@ -68,6 +68,8 @@ #include #include +#include "tcf_proto.h" + /* * kernel internal service curve representation: * coordinates are given by 64 bit unsigned integers. diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index 43c4bfe625a9..c206b3cfdfb2 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -38,10 +38,10 @@ #include #include #include -#include #include #include +#include "tcf_proto.h" /* HTB algorithm. Author: devik@cdi.cz ======================================================================== diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c index 1da7ea8de0ad..107563c14e24 100644 --- a/net/sched/sch_multiq.c +++ b/net/sched/sch_multiq.c @@ -27,6 +27,8 @@ #include #include +#include "tcf_proto.h" + struct multiq_sched_data { u16 bands; u16 max_bands; diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c index 222e53d3d27a..4fed3fd38dd3 100644 --- a/net/sched/sch_prio.c +++ b/net/sched/sch_prio.c @@ -22,6 +22,8 @@ #include #include +#include "tcf_proto.h" + struct prio_sched_data { int bands; struct tcf_proto __rcu *filter_list; diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c index bb1a9c11fc54..32f68e639037 100644 --- a/net/sched/sch_qfq.c +++ b/net/sched/sch_qfq.c @@ -19,6 +19,8 @@ #include #include +#include "tcf_proto.h" + /* Quick Fair Queueing Plus ======================== diff --git a/net/sched/sch_sfb.c b/net/sched/sch_sfb.c index 7cbdad8419b7..5465249c600f 100644 --- a/net/sched/sch_sfb.c +++ b/net/sched/sch_sfb.c @@ -28,6 +28,8 @@ #include #include +#include "tcf_proto.h" + /* * SFB uses two B[l][n] : L x N arrays of bins (L levels, N bins per level) * This implementation uses L = 8 and N = 16 diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c index 2f2678197760..abc1598e87e7 100644 --- a/net/sched/sch_sfq.c +++ b/net/sched/sch_sfq.c @@ -26,6 +26,8 @@ #include #include +#include "tcf_proto.h" + /* Stochastic Fairness Queuing algorithm. ======================================= diff --git a/net/sched/tcf_proto.h b/net/sched/tcf_proto.h new file mode 100644 index 000000000000..b8d0e15e7f26 --- /dev/null +++ b/net/sched/tcf_proto.h @@ -0,0 +1,104 @@ +/* struct tcf_proto internal details - outside of net/sched it's opaque */ + +#include + +struct tcf_proto { + /* Fast access part */ + struct tcf_proto __rcu *next; + void __rcu *root; + + /* called under RCU BH lock*/ + int (*classify)(struct sk_buff *, + const struct tcf_proto *, + struct tcf_result *); + __be16 protocol; + + /* All the rest */ + u32 prio; + void *data; + const struct tcf_proto_ops *ops; + struct tcf_chain *chain; + struct rcu_head rcu; +}; + +struct tcf_proto_ops { + struct list_head head; + char kind[IFNAMSIZ]; + + int (*classify)(struct sk_buff *, + const struct tcf_proto *, + struct tcf_result *); + int (*init)(struct tcf_proto*); + void (*destroy)(struct tcf_proto *tp, + struct netlink_ext_ack *extack); + + void* (*get)(struct tcf_proto*, u32 handle); + int (*change)(struct net *net, struct sk_buff *, + struct tcf_proto*, unsigned long, + u32 handle, struct nlattr **, + void **, bool, + struct netlink_ext_ack *); + int (*delete)(struct tcf_proto *tp, void *arg, + bool *last, + struct netlink_ext_ack *); + void (*walk)(struct tcf_proto*, struct tcf_walker *arg); + int (*reoffload)(struct tcf_proto *tp, bool add, + tc_setup_cb_t *cb, void *cb_priv, + struct netlink_ext_ack *extack); + void (*bind_class)(void *, u32, unsigned long); + void * (*tmplt_create)(struct net *net, + struct tcf_chain *chain, + struct nlattr **tca, + struct netlink_ext_ack *extack); + void (*tmplt_destroy)(void *tmplt_priv); + + /* rtnetlink specific */ + int (*dump)(struct net*, struct tcf_proto*, void *, + struct sk_buff *skb, struct tcmsg*); + int (*tmplt_dump)(struct sk_buff *skb, + struct net *net, + void *tmplt_priv); + + struct module *owner; +}; + +static inline void +tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base) +{ + struct Qdisc *q = tp->chain->block->q; + unsigned long cl; + + /* Check q as it is not set for shared blocks. In that case, + * setting class is not supported. + */ + if (!q) + return; + cl = q->ops->cl_ops->bind_tcf(q, base, r->classid); + cl = cls_set_class(q, &r->class, cl); + if (cl) + q->ops->cl_ops->unbind_tcf(q, cl); +} + +static inline void +tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r) +{ + struct Qdisc *q = tp->chain->block->q; + unsigned long cl; + + if (!q) + return; + if ((cl = __cls_set_class(&r->class, 0)) != 0) + q->ops->cl_ops->unbind_tcf(q, cl); +} + +static inline void +tc_cls_common_offload_init(struct tc_cls_common_offload *cls_common, + const struct tcf_proto *tp, u32 flags, + struct netlink_ext_ack *extack) +{ + cls_common->chain_index = tp->chain->index; + cls_common->protocol = tp->protocol; + cls_common->prio = tp->prio; + if (tc_skip_sw(flags) || flags & TCA_CLS_FLAGS_VERBOSE) + cls_common->extack = extack; +}