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2019-03-19net: sched: flower: insert new filter to idr after setting its maskVlad Buslov
[ Upstream commit ecb3dea400d3beaf611ce76ac7a51d4230492cf2 ] When adding new filter to flower classifier, fl_change() inserts it to handle_idr before initializing filter extensions and assigning it a mask. Normally this ordering doesn't matter because all flower classifier ops callbacks assume rtnl lock protection. However, when filter has an action that doesn't have its kernel module loaded, rtnl lock is released before call to request_module(). During this time the filter can be accessed bu concurrent task before its initialization is completed, which can lead to a crash. Example case of NULL pointer dereference in concurrent dump: Task 1 Task 2 tc_new_tfilter() fl_change() idr_alloc_u32(fnew) fl_set_parms() tcf_exts_validate() tcf_action_init() tcf_action_init_1() rtnl_unlock() request_module() ... rtnl_lock() tc_dump_tfilter() tcf_chain_dump() fl_walk() idr_get_next_ul() tcf_node_dump() tcf_fill_node() fl_dump() mask = &f->mask->key; <- NULL ptr rtnl_lock() Extension initialization and mask assignment don't depend on fnew->handle that is allocated by idr_alloc_u32(). Move idr allocation code after action creation and mask assignment in fl_change() to prevent concurrent access to not fully initialized filter when rtnl lock is released to load action module. Fixes: 01683a146999 ("net: sched: refactor flower walk to iterate over idr") Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Reviewed-by: Roi Dayan <roid@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-10net: sched: act_tunnel_key: fix NULL pointer dereference during initVlad Buslov
[ Upstream commit a3df633a3c92bb96b06552c3f828d7c267774379 ] Metadata pointer is only initialized for action TCA_TUNNEL_KEY_ACT_SET, but it is unconditionally dereferenced in tunnel_key_init() error handler. Verify that metadata pointer is not NULL before dereferencing it in tunnel_key_init error handling code. Fixes: ee28bb56ac5b ("net/sched: fix memory leak in act_tunnel_key_init()") Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Reviewed-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-10net/sched: act_skbedit: fix refcount leak when replace failsDavide Caratti
[ Upstream commit 6191da98062d25276a3b88fb2a94dcbcfb3ea65d ] when act_skbedit was converted to use RCU in the data plane, we added an error path, but we forgot to drop the action refcount in case of failure during a 'replace' operation: # tc actions add action skbedit ptype otherhost pass index 100 # tc action show action skbedit total acts 1 action order 0: skbedit ptype otherhost pass index 100 ref 1 bind 0 # tc actions replace action skbedit ptype otherhost drop index 100 RTNETLINK answers: Cannot allocate memory We have an error talking to the kernel # tc action show action skbedit total acts 1 action order 0: skbedit ptype otherhost pass index 100 ref 2 bind 0 Ensure we call tcf_idr_release(), in case 'params_new' allocation failed, also when the action is being replaced. Fixes: c749cdda9089 ("net/sched: act_skbedit: don't use spinlock in the data path") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-10net/sched: act_ipt: fix refcount leak when replace failsDavide Caratti
[ Upstream commit 8f67c90ee9148eab3d2b4393c3cf76489b27f87c ] After commit 4e8ddd7f1758 ("net: sched: don't release reference on action overwrite"), the error path of all actions was converted to drop refcount also when the action was being overwritten. But we forgot act_ipt_init(), in case allocation of 'tname' was not successful: # tc action add action xt -j LOG --log-prefix hello index 100 tablename: mangle hook: NF_IP_POST_ROUTING target: LOG level warning prefix "hello" index 100 # tc action show action xt total acts 1 action order 0: tablename: mangle hook: NF_IP_POST_ROUTING target LOG level warning prefix "hello" index 100 ref 1 bind 0 # tc action replace action xt -j LOG --log-prefix world index 100 tablename: mangle hook: NF_IP_POST_ROUTING target: LOG level warning prefix "world" index 100 RTNETLINK answers: Cannot allocate memory We have an error talking to the kernel # tc action show action xt total acts 1 action order 0: tablename: mangle hook: NF_IP_POST_ROUTING target LOG level warning prefix "hello" index 100 ref 2 bind 0 Ensure we call tcf_idr_release(), in case 'tname' allocation failed, also when the action is being replaced. Fixes: 4e8ddd7f1758 ("net: sched: don't release reference on action overwrite") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-10net: netem: fix skb length BUG_ON in __skb_to_sgvecSheng Lan
[ Upstream commit 5845f706388a4cde0f6b80f9e5d33527e942b7d9 ] It can be reproduced by following steps: 1. virtio_net NIC is configured with gso/tso on 2. configure nginx as http server with an index file bigger than 1M bytes 3. use tc netem to produce duplicate packets and delay: tc qdisc add dev eth0 root netem delay 100ms 10ms 30% duplicate 90% 4. continually curl the nginx http server to get index file on client 5. BUG_ON is seen quickly [10258690.371129] kernel BUG at net/core/skbuff.c:4028! [10258690.371748] invalid opcode: 0000 [#1] SMP PTI [10258690.372094] CPU: 5 PID: 0 Comm: swapper/5 Tainted: G W 5.0.0-rc6 #2 [10258690.372094] RSP: 0018:ffffa05797b43da0 EFLAGS: 00010202 [10258690.372094] RBP: 00000000000005ea R08: 0000000000000000 R09: 00000000000005ea [10258690.372094] R10: ffffa0579334d800 R11: 00000000000002c0 R12: 0000000000000002 [10258690.372094] R13: 0000000000000000 R14: ffffa05793122900 R15: ffffa0578f7cb028 [10258690.372094] FS: 0000000000000000(0000) GS:ffffa05797b40000(0000) knlGS:0000000000000000 [10258690.372094] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [10258690.372094] CR2: 00007f1a6dc00868 CR3: 000000001000e000 CR4: 00000000000006e0 [10258690.372094] Call Trace: [10258690.372094] <IRQ> [10258690.372094] skb_to_sgvec+0x11/0x40 [10258690.372094] start_xmit+0x38c/0x520 [virtio_net] [10258690.372094] dev_hard_start_xmit+0x9b/0x200 [10258690.372094] sch_direct_xmit+0xff/0x260 [10258690.372094] __qdisc_run+0x15e/0x4e0 [10258690.372094] net_tx_action+0x137/0x210 [10258690.372094] __do_softirq+0xd6/0x2a9 [10258690.372094] irq_exit+0xde/0xf0 [10258690.372094] smp_apic_timer_interrupt+0x74/0x140 [10258690.372094] apic_timer_interrupt+0xf/0x20 [10258690.372094] </IRQ> In __skb_to_sgvec(), the skb->len is not equal to the sum of the skb's linear data size and nonlinear data size, thus BUG_ON triggered. Because the skb is cloned and a part of nonlinear data is split off. Duplicate packet is cloned in netem_enqueue() and may be delayed some time in qdisc. When qdisc len reached the limit and returns NET_XMIT_DROP, the skb will be retransmit later in write queue. the skb will be fragmented by tso_fragment(), the limit size that depends on cwnd and mss decrease, the skb's nonlinear data will be split off. The length of the skb cloned by netem will not be updated. When we use virtio_net NIC and invoke skb_to_sgvec(), the BUG_ON trigger. To fix it, netem returns NET_XMIT_SUCCESS to upper stack when it clones a duplicate packet. Fixes: 35d889d1 ("sch_netem: fix skb leak in netem_enqueue()") Signed-off-by: Sheng Lan <lansheng@huawei.com> Reported-by: Qin Ji <jiqin.ji@huawei.com> Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-10net: sched: put back q.qlen into a single locationEric Dumazet
[ Upstream commit 46b1c18f9deb326a7e18348e668e4c7ab7c7458b ] In the series fc8b81a5981f ("Merge branch 'lockless-qdisc-series'") John made the assumption that the data path had no need to read the qdisc qlen (number of packets in the qdisc). It is true when pfifo_fast is used as the root qdisc, or as direct MQ/MQPRIO children. But pfifo_fast can be used as leaf in class full qdiscs, and existing logic needs to access the child qlen in an efficient way. HTB breaks badly, since it uses cl->leaf.q->q.qlen in : htb_activate() -> WARN_ON() htb_dequeue_tree() to decide if a class can be htb_deactivated when it has no more packets. HFSC, DRR, CBQ, QFQ have similar issues, and some calls to qdisc_tree_reduce_backlog() also read q.qlen directly. Using qdisc_qlen_sum() (which iterates over all possible cpus) in the data path is a non starter. It seems we have to put back qlen in a central location, at least for stable kernels. For all qdisc but pfifo_fast, qlen is guarded by the qdisc lock, so the existing q.qlen{++|--} are correct. For 'lockless' qdisc (pfifo_fast so far), we need to use atomic_{inc|dec}() because the spinlock might be not held (for example from pfifo_fast_enqueue() and pfifo_fast_dequeue()) This patch adds atomic_qlen (in the same location than qlen) and renames the following helpers, since we want to express they can be used without qdisc lock, and that qlen is no longer percpu. - qdisc_qstats_cpu_qlen_dec -> qdisc_qstats_atomic_qlen_dec() - qdisc_qstats_cpu_qlen_inc -> qdisc_qstats_atomic_qlen_inc() Later (net-next) we might revert this patch by tracking all these qlen uses and replace them by a more efficient method (not having to access a precise qlen, but an empty/non_empty status that might be less expensive to maintain/track). Another possibility is to have a legacy pfifo_fast version that would be used when used a a child qdisc, since the parent qdisc needs a spinlock anyway. But then, future lockless qdiscs would also have the same problem. Fixes: 7e66016f2c65 ("net: sched: helpers to sum qlen and qlen for per cpu logic") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: John Fastabend <john.fastabend@gmail.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Cong Wang <xiyou.wangcong@gmail.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-27net_sched: fix two more memory leaks in cls_tcindexCong Wang
[ Upstream commit 1db817e75f5b9387b8db11e37d5f0624eb9223e0 ] struct tcindex_filter_result contains two parts: struct tcf_exts and struct tcf_result. For the local variable 'cr', its exts part is never used but initialized without being released properly on success path. So just completely remove the exts part to fix this leak. For the local variable 'new_filter_result', it is never properly released if not used by 'r' on success path. Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-27net_sched: fix a memory leak in cls_tcindexCong Wang
[ Upstream commit 033b228e7f26b29ae37f8bfa1bc6b209a5365e9f ] When tcindex_destroy() destroys all the filter results in the perfect hash table, it invokes the walker to delete each of them. However, results with class==0 are skipped in either tcindex_walk() or tcindex_delete(), which causes a memory leak reported by kmemleak. This patch fixes it by skipping the walker and directly deleting these filter results so we don't miss any filter result. As a result of this change, we have to initialize exts->net properly in tcindex_alloc_perfect_hash(). For net-next, we need to consider whether we should initialize ->net in tcf_exts_init() instead, before that just directly test CONFIG_NET_CLS_ACT=y. Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-27net_sched: fix a race condition in tcindex_destroy()Cong Wang
[ Upstream commit 8015d93ebd27484418d4952284fd02172fa4b0b2 ] tcindex_destroy() invokes tcindex_destroy_element() via a walker to delete each filter result in its perfect hash table, and tcindex_destroy_element() calls tcindex_delete() which schedules tcf RCU works to do the final deletion work. Unfortunately this races with the RCU callback __tcindex_destroy(), which could lead to use-after-free as reported by Adrian. Fix this by migrating this RCU callback to tcf RCU work too, as that workqueue is ordered, we will not have use-after-free. Note, we don't need to hold netns refcnt because we don't call tcf_exts_destroy() here. Fixes: 27ce4f05e2ab ("net_sched: use tcf_queue_work() in tcindex filter") Reported-by: Adrian <bugs@abtelecom.ro> Cc: Ben Hutchings <ben@decadent.org.uk> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-01-31net/sched: cls_flower: allocate mask dynamically in fl_change()Ivan Vecera
[ Upstream commit 2cddd20147826aef283115abb00012d4dafe3cdb ] Recent changes (especially 05cd271fd61a ("cls_flower: Support multiple masks per priority")) in the fl_flow_mask structure grow it and its current size e.g. on x86_64 with defconfig is 760 bytes and more than 1024 bytes with some debug options enabled. Prior the mentioned commit its size was 176 bytes (using defconfig on x86_64). With regard to this fact it's reasonable to allocate this structure dynamically in fl_change() to reduce its stack size. v2: - use kzalloc() instead of kcalloc() Fixes: 05cd271fd61a ("cls_flower: Support multiple masks per priority") Cc: Jiri Pirko <jiri@resnulli.us> Cc: Paul Blakey <paulb@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Ivan Vecera <ivecera@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-01-31net_sched: refetch skb protocol for each filterCong Wang
[ Upstream commit cd0c4e70fc0ccfa705cdf55efb27519ce9337a26 ] Martin reported a set of filters don't work after changing from reclassify to continue. Looking into the code, it looks like skb protocol is not always fetched for each iteration of the filters. But, as demonstrated by Martin, TC actions could modify skb->protocol, for example act_vlan, this means we have to refetch skb protocol in each iteration, rather than using the one we fetch in the beginning of the loop. This bug is _not_ introduced by commit 3b3ae880266d ("net: sched: consolidate tc_classify{,_compat}"), technically, if act_vlan is the only action that modifies skb protocol, then it is commit c7e2b9689ef8 ("sched: introduce vlan action") which introduced this bug. Reported-by: Martin Olsson <martin.olsson+netdev@sentorsecurity.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-01-31net/sched: act_tunnel_key: fix memory leak in case of action replaceDavide Caratti
[ Upstream commit 9174c3df1cd181c14913138d50ccbe539bb08335 ] running the following TDC test cases: 7afc - Replace tunnel_key set action with all parameters 364d - Replace tunnel_key set action with all parameters and cookie it's possible to trigger kmemleak warnings like: unreferenced object 0xffff94797127ab40 (size 192): comm "tc", pid 3248, jiffies 4300565293 (age 1006.862s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 c0 93 f9 8a ff ff ff ff ................ 41 84 ee 89 ff ff ff ff 00 00 00 00 00 00 00 00 A............... backtrace: [<000000001e85b61c>] tunnel_key_init+0x31d/0x820 [act_tunnel_key] [<000000007f3f6ee7>] tcf_action_init_1+0x384/0x4c0 [<00000000e89e3ded>] tcf_action_init+0x12b/0x1a0 [<00000000c1c8c0f8>] tcf_action_add+0x73/0x170 [<0000000095a9fc28>] tc_ctl_action+0x122/0x160 [<000000004bebeac5>] rtnetlink_rcv_msg+0x263/0x2d0 [<000000009fd862dd>] netlink_rcv_skb+0x4a/0x110 [<00000000b55199e7>] netlink_unicast+0x1a0/0x250 [<000000004996cd21>] netlink_sendmsg+0x2c1/0x3c0 [<000000004d6a94b4>] sock_sendmsg+0x36/0x40 [<000000005d9f0208>] ___sys_sendmsg+0x280/0x2f0 [<00000000dec19023>] __sys_sendmsg+0x5e/0xa0 [<000000004b82ac81>] do_syscall_64+0x5b/0x180 [<00000000a0f1209a>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [<000000002926b2ab>] 0xffffffffffffffff when the tunnel_key action is replaced, the kernel forgets to release the dst metadata: ensure they are released by tunnel_key_init(), the same way it's done in tunnel_key_release(). Fixes: d0f6dd8a914f4 ("net/sched: Introduce act_tunnel_key") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-12-17net: Prevent invalid access to skb->prev in __qdisc_drop_allChristoph Paasch
[ Upstream commit 9410d386d0a829ace9558336263086c2fbbe8aed ] __qdisc_drop_all() accesses skb->prev to get to the tail of the segment-list. With commit 68d2f84a1368 ("net: gro: properly remove skb from list") the skb-list handling has been changed to set skb->next to NULL and set the list-poison on skb->prev. With that change, __qdisc_drop_all() will panic when it tries to dereference skb->prev. Since commit 992cba7e276d ("net: Add and use skb_list_del_init().") __list_del_entry is used, leaving skb->prev unchanged (thus, pointing to the list-head if it's the first skb of the list). This will make __qdisc_drop_all modify the next-pointer of the list-head and result in a panic later on: [ 34.501053] general protection fault: 0000 [#1] SMP KASAN PTI [ 34.501968] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.20.0-rc2.mptcp #108 [ 34.502887] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.5.1 01/01/2011 [ 34.504074] RIP: 0010:dev_gro_receive+0x343/0x1f90 [ 34.504751] Code: e0 48 c1 e8 03 42 80 3c 30 00 0f 85 4a 1c 00 00 4d 8b 24 24 4c 39 65 d0 0f 84 0a 04 00 00 49 8d 7c 24 38 48 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 74 08 3c 04 [ 34.507060] RSP: 0018:ffff8883af507930 EFLAGS: 00010202 [ 34.507761] RAX: 0000000000000007 RBX: ffff8883970b2c80 RCX: 1ffff11072e165a6 [ 34.508640] RDX: 1ffff11075867008 RSI: ffff8883ac338040 RDI: 0000000000000038 [ 34.509493] RBP: ffff8883af5079d0 R08: ffff8883970b2d40 R09: 0000000000000062 [ 34.510346] R10: 0000000000000034 R11: 0000000000000000 R12: 0000000000000000 [ 34.511215] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8883ac338008 [ 34.512082] FS: 0000000000000000(0000) GS:ffff8883af500000(0000) knlGS:0000000000000000 [ 34.513036] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.513741] CR2: 000055ccc3e9d020 CR3: 00000003abf32000 CR4: 00000000000006e0 [ 34.514593] Call Trace: [ 34.514893] <IRQ> [ 34.515157] napi_gro_receive+0x93/0x150 [ 34.515632] receive_buf+0x893/0x3700 [ 34.516094] ? __netif_receive_skb+0x1f/0x1a0 [ 34.516629] ? virtnet_probe+0x1b40/0x1b40 [ 34.517153] ? __stable_node_chain+0x4d0/0x850 [ 34.517684] ? kfree+0x9a/0x180 [ 34.518067] ? __kasan_slab_free+0x171/0x190 [ 34.518582] ? detach_buf+0x1df/0x650 [ 34.519061] ? lapic_next_event+0x5a/0x90 [ 34.519539] ? virtqueue_get_buf_ctx+0x280/0x7f0 [ 34.520093] virtnet_poll+0x2df/0xd60 [ 34.520533] ? receive_buf+0x3700/0x3700 [ 34.521027] ? qdisc_watchdog_schedule_ns+0xd5/0x140 [ 34.521631] ? htb_dequeue+0x1817/0x25f0 [ 34.522107] ? sch_direct_xmit+0x142/0xf30 [ 34.522595] ? virtqueue_napi_schedule+0x26/0x30 [ 34.523155] net_rx_action+0x2f6/0xc50 [ 34.523601] ? napi_complete_done+0x2f0/0x2f0 [ 34.524126] ? kasan_check_read+0x11/0x20 [ 34.524608] ? _raw_spin_lock+0x7d/0xd0 [ 34.525070] ? _raw_spin_lock_bh+0xd0/0xd0 [ 34.525563] ? kvm_guest_apic_eoi_write+0x6b/0x80 [ 34.526130] ? apic_ack_irq+0x9e/0xe0 [ 34.526567] __do_softirq+0x188/0x4b5 [ 34.527015] irq_exit+0x151/0x180 [ 34.527417] do_IRQ+0xdb/0x150 [ 34.527783] common_interrupt+0xf/0xf [ 34.528223] </IRQ> This patch makes sure that skb->prev is set to NULL when entering netem_enqueue. Cc: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> Cc: Tyler Hicks <tyhicks@canonical.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Fixes: 68d2f84a1368 ("net: gro: properly remove skb from list") Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Christoph Paasch <cpaasch@apple.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-11-23net: sched: cls_flower: validate nested enc_opts_policy to avoid warningJakub Kicinski
[ Upstream commit 63c82997f5c0f3e1b914af43d82f712a86bc5f3a ] TCA_FLOWER_KEY_ENC_OPTS and TCA_FLOWER_KEY_ENC_OPTS_MASK can only currently contain further nested attributes, which are parsed by hand, so the policy is never actually used resulting in a W=1 build warning: net/sched/cls_flower.c:492:1: warning: ‘enc_opts_policy’ defined but not used [-Wunused-const-variable=] enc_opts_policy[TCA_FLOWER_KEY_ENC_OPTS_MAX + 1] = { Add the validation anyway to avoid potential bugs when other attributes are added and to make the attribute structure slightly more clear. Validation will also set extact to point to bad attribute on error. Fixes: 0a6e77784f49 ("net/sched: allow flower to match tunnel options") Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Simon Horman <simon.horman@netronome.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-11-23net/sched: act_pedit: fix memory leak when IDR allocation failsDavide Caratti
[ Upstream commit 19ab69107d3ecfb7cd3e38ad262a881be40c01a3 ] tcf_idr_check_alloc() can return a negative value, on allocation failures (-ENOMEM) or IDR exhaustion (-ENOSPC): don't leak keys_ex in these cases. Fixes: 0190c1d452a9 ("net: sched: atomically check-allocate action") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-11-13net: sched: Remove TCA_OPTIONS from policyDavid Ahern
commit e72bde6b66299602087c8c2350d36a525e75d06e upstream. Marco reported an error with hfsc: root@Calimero:~# tc qdisc add dev eth0 root handle 1:0 hfsc default 1 Error: Attribute failed policy validation. Apparently a few implementations pass TCA_OPTIONS as a binary instead of nested attribute, so drop TCA_OPTIONS from the policy. Fixes: 8b4c3cdd9dd8 ("net: sched: Add policy validation for tc attributes") Reported-by: Marco Berizzi <pupilla@libero.it> Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-11-04net: sched: gred: pass the right attribute to gred_change_table_def()Jakub Kicinski
[ Upstream commit 38b4f18d56372e1e21771ab7b0357b853330186c ] gred_change_table_def() takes a pointer to TCA_GRED_DPS attribute, and expects it will be able to interpret its contents as struct tc_gred_sopt. Pass the correct gred attribute, instead of TCA_OPTIONS. This bug meant the table definition could never be changed after Qdisc was initialized (unless whatever TCA_OPTIONS contained both passed netlink validation and was a valid struct tc_gred_sopt...). Old behaviour: $ ip link add type dummy $ tc qdisc replace dev dummy0 parent root handle 7: \ gred setup vqs 4 default 0 $ tc qdisc replace dev dummy0 parent root handle 7: \ gred setup vqs 4 default 0 RTNETLINK answers: Invalid argument Now: $ ip link add type dummy $ tc qdisc replace dev dummy0 parent root handle 7: \ gred setup vqs 4 default 0 $ tc qdisc replace dev dummy0 parent root handle 7: \ gred setup vqs 4 default 0 $ tc qdisc replace dev dummy0 parent root handle 7: \ gred setup vqs 4 default 0 Fixes: f62d6b936df5 ("[PKT_SCHED]: GRED: Use central VQ change procedure") Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-10-18net: sched: Fix for duplicate class dumpPhil Sutter
When dumping classes by parent, kernel would return classes twice: | # tc qdisc add dev lo root prio | # tc class show dev lo | class prio 8001:1 parent 8001: | class prio 8001:2 parent 8001: | class prio 8001:3 parent 8001: | # tc class show dev lo parent 8001: | class prio 8001:1 parent 8001: | class prio 8001:2 parent 8001: | class prio 8001:3 parent 8001: | class prio 8001:1 parent 8001: | class prio 8001:2 parent 8001: | class prio 8001:3 parent 8001: This comes from qdisc_match_from_root() potentially returning the root qdisc itself if its handle matched. Though in that case, root's classes were already dumped a few lines above. Fixes: cb395b2010879 ("net: sched: optimize class dumps") Signed-off-by: Phil Sutter <phil@nwl.cc> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-15net/sched: cls_api: add missing validation of netlink attributesDavide Caratti
Similarly to what has been done in 8b4c3cdd9dd8 ("net: sched: Add policy validation for tc attributes"), fix classifier code to add validation of TCA_CHAIN and TCA_KIND netlink attributes. tested with: # ./tdc.py -c filter v2: Let sch_api and cls_api share nla_policy they have in common, thanks to David Ahern. v3: Avoid EXPORT_SYMBOL(), as validation of those attributes is not done by TC modules, thanks to Cong Wang. While at it, restore the 'Delete / get qdisc' comment to its orginal position, just above tc_get_qdisc() function prototype. Fixes: 5bc1701881e39 ("net: sched: introduce multichain support for filters") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-12Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netGreg Kroah-Hartman
David writes: "Networking 1) RXRPC receive path fixes from David Howells. 2) Re-export __skb_recv_udp(), from Jiri Kosina. 3) Fix refcounting in u32 classificer, from Al Viro. 4) Userspace netlink ABI fixes from Eugene Syromiatnikov. 5) Don't double iounmap on rmmod in ena driver, from Arthur Kiyanovski. 6) Fix devlink string attribute handling, we must pull a copy into a kernel buffer if the lifetime extends past the netlink request. From Moshe Shemesh. 7) Fix hangs in RDS, from Ka-Cheong Poon. 8) Fix recursive locking lockdep warnings in tipc, from Ying Xue. 9) Clear RX irq correctly in socionext, from Ilias Apalodimas. 10) bcm_sf2 fixes from Florian Fainelli." * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (38 commits) net: dsa: bcm_sf2: Call setup during switch resume net: dsa: bcm_sf2: Fix unbind ordering net: phy: sfp: remove sfp_mutex's definition r8169: set RX_MULTI_EN bit in RxConfig for 8168F-family chips net: socionext: clear rx irq correctly net/mlx4_core: Fix warnings during boot on driverinit param set failures tipc: eliminate possible recursive locking detected by LOCKDEP selftests: udpgso_bench.sh explicitly requires bash selftests: rtnetlink.sh explicitly requires bash. qmi_wwan: Added support for Gemalto's Cinterion ALASxx WWAN interface tipc: queue socket protocol error messages into socket receive buffer tipc: set link tolerance correctly in broadcast link net: ipv4: don't let PMTU updates increase route MTU net: ipv4: update fnhe_pmtu when first hop's MTU changes net/ipv6: stop leaking percpu memory in fib6 info rds: RDS (tcp) hangs on sendto() to unresponding address net: make skb_partial_csum_set() more robust against overflows devlink: Add helper function for safely copy string param devlink: Fix param cmode driverinit for string type devlink: Fix param set handling for string type ...
2018-10-11Merge tag 'alloc-args-v4.19-rc8' of ↵Greg Kroah-Hartman
https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Kees writes: "Fix open-coded multiplication arguments to allocators - Fixes several new open-coded multiplications added in the 4.19 merge window." * tag 'alloc-args-v4.19-rc8' of https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: treewide: Replace more open-coded allocation size multiplications
2018-10-07net: sched: cls_u32: fix hnode refcountingAl Viro
cls_u32.c misuses refcounts for struct tc_u_hnode - it counts references via ->hlist and via ->tp_root together. u32_destroy() drops the former and, in case when there had been links, leaves the sucker on the list. As the result, there's nothing to protect it from getting freed once links are dropped. That also makes the "is it busy" check incapable of catching the root hnode - it *is* busy (there's a reference from tp), but we don't see it as something separate. "Is it our root?" check partially covers that, but the problem exists for others' roots as well. AFAICS, the minimal fix preserving the existing behaviour (where it doesn't include oopsen, that is) would be this: * count tp->root and tp_c->hlist as separate references. I.e. have u32_init() set refcount to 2, not 1. * in u32_destroy() we always drop the former; in u32_destroy_hnode() - the latter. That way we have *all* references contributing to refcount. List removal happens in u32_destroy_hnode() (called only when ->refcnt is 1) an in u32_destroy() in case of tc_u_common going away, along with everything reachable from it. IOW, that way we know that u32_destroy_key() won't free something still on the list (or pointed to by someone's ->root). Reproducer: tc qdisc add dev eth0 ingress tc filter add dev eth0 parent ffff: protocol ip prio 100 handle 1: \ u32 divisor 1 tc filter add dev eth0 parent ffff: protocol ip prio 200 handle 2: \ u32 divisor 1 tc filter add dev eth0 parent ffff: protocol ip prio 100 \ handle 1:0:11 u32 ht 1: link 801: offset at 0 mask 0f00 shift 6 \ plus 0 eat match ip protocol 6 ff tc filter delete dev eth0 parent ffff: protocol ip prio 200 tc filter change dev eth0 parent ffff: protocol ip prio 100 \ handle 1:0:11 u32 ht 1: link 0: offset at 0 mask 0f00 shift 6 plus 0 \ eat match ip protocol 6 ff tc filter delete dev eth0 parent ffff: protocol ip prio 100 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-05treewide: Replace more open-coded allocation size multiplicationsKees Cook
As done treewide earlier, this catches several more open-coded allocation size calculations that were added to the kernel during the merge window. This performs the following mechanical transformations using Coccinelle: kvmalloc(a * b, ...) -> kvmalloc_array(a, b, ...) kvzalloc(a * b, ...) -> kvcalloc(a, b, ...) devm_kzalloc(..., a * b, ...) -> devm_kcalloc(..., a, b, ...) Signed-off-by: Kees Cook <keescook@chromium.org>
2018-10-05net: sched: Add policy validation for tc attributesDavid Ahern
A number of TC attributes are processed without proper validation (e.g., length checks). Add a tca policy for all input attributes and use when invoking nlmsg_parse. The 2 Fixes tags below cover the latest additions. The other attributes are a string (KIND), nested attribute (OPTIONS which does seem to have validation in most cases), for dumps only or a flag. Fixes: 5bc1701881e39 ("net: sched: introduce multichain support for filters") Fixes: d47a6b0e7c492 ("net: sched: introduce ingress/egress block index attributes for qdisc") Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-01net: sched: act_ipt: check for underflow in __tcf_ipt_init()Dan Carpenter
If "td->u.target_size" is larger than sizeof(struct xt_entry_target) we return -EINVAL. But we don't check whether it's smaller than sizeof(struct xt_entry_target) and that could lead to an out of bounds read. Fixes: 7ba699c604ab ("[NET_SCHED]: Convert actions from rtnetlink to new netlink API") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-09-14net/sched: act_sample: fix NULL dereference in the data pathDavide Caratti
Matteo reported the following splat, testing the datapath of TC 'sample': BUG: KASAN: null-ptr-deref in tcf_sample_act+0xc4/0x310 Read of size 8 at addr 0000000000000000 by task nc/433 CPU: 0 PID: 433 Comm: nc Not tainted 4.19.0-rc3-kvm #17 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS ?-20180531_142017-buildhw-08.phx2.fedoraproject.org-1.fc28 04/01/2014 Call Trace: kasan_report.cold.6+0x6c/0x2fa tcf_sample_act+0xc4/0x310 ? dev_hard_start_xmit+0x117/0x180 tcf_action_exec+0xa3/0x160 tcf_classify+0xdd/0x1d0 htb_enqueue+0x18e/0x6b0 ? deref_stack_reg+0x7a/0xb0 ? htb_delete+0x4b0/0x4b0 ? unwind_next_frame+0x819/0x8f0 ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 __dev_queue_xmit+0x722/0xca0 ? unwind_get_return_address_ptr+0x50/0x50 ? netdev_pick_tx+0xe0/0xe0 ? save_stack+0x8c/0xb0 ? kasan_kmalloc+0xbe/0xd0 ? __kmalloc_track_caller+0xe4/0x1c0 ? __kmalloc_reserve.isra.45+0x24/0x70 ? __alloc_skb+0xdd/0x2e0 ? sk_stream_alloc_skb+0x91/0x3b0 ? tcp_sendmsg_locked+0x71b/0x15a0 ? tcp_sendmsg+0x22/0x40 ? __sys_sendto+0x1b0/0x250 ? __x64_sys_sendto+0x6f/0x80 ? do_syscall_64+0x5d/0x150 ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 ? __sys_sendto+0x1b0/0x250 ? __x64_sys_sendto+0x6f/0x80 ? do_syscall_64+0x5d/0x150 ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 ip_finish_output2+0x495/0x590 ? ip_copy_metadata+0x2e0/0x2e0 ? skb_gso_validate_network_len+0x6f/0x110 ? ip_finish_output+0x174/0x280 __tcp_transmit_skb+0xb17/0x12b0 ? __tcp_select_window+0x380/0x380 tcp_write_xmit+0x913/0x1de0 ? __sk_mem_schedule+0x50/0x80 tcp_sendmsg_locked+0x49d/0x15a0 ? tcp_rcv_established+0x8da/0xa30 ? tcp_set_state+0x220/0x220 ? clear_user+0x1f/0x50 ? iov_iter_zero+0x1ae/0x590 ? __fget_light+0xa0/0xe0 tcp_sendmsg+0x22/0x40 __sys_sendto+0x1b0/0x250 ? __ia32_sys_getpeername+0x40/0x40 ? _copy_to_user+0x58/0x70 ? poll_select_copy_remaining+0x176/0x200 ? __pollwait+0x1c0/0x1c0 ? ktime_get_ts64+0x11f/0x140 ? kern_select+0x108/0x150 ? core_sys_select+0x360/0x360 ? vfs_read+0x127/0x150 ? kernel_write+0x90/0x90 __x64_sys_sendto+0x6f/0x80 do_syscall_64+0x5d/0x150 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fefef2b129d Code: ff ff ff ff eb b6 0f 1f 80 00 00 00 00 48 8d 05 51 37 0c 00 41 89 ca 8b 00 85 c0 75 20 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 6b f3 c3 66 0f 1f 84 00 00 00 00 00 41 56 41 RSP: 002b:00007fff2f5350c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000056118d60c120 RCX: 00007fefef2b129d RDX: 0000000000002000 RSI: 000056118d629320 RDI: 0000000000000003 RBP: 000056118d530370 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000002000 R13: 000056118d5c2a10 R14: 000056118d5c2a10 R15: 000056118d5303b8 tcf_sample_act() tried to update its per-cpu stats, but tcf_sample_init() forgot to allocate them, because tcf_idr_create() was called with a wrong value of 'cpustats'. Setting it to true proved to fix the reported crash. Reported-by: Matteo Croce <mcroce@redhat.com> Fixes: 65a206c01e8e ("net/sched: Change act_api and act_xxx modules to use IDR") Fixes: 5c5670fae430 ("net/sched: Introduce sample tc action") Tested-by: Matteo Croce <mcroce@redhat.com> Signed-off-by: Davide Caratti <dcaratti@redhat.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-09-13net_sched: notify filter deletion when deleting a chainCong Wang
When we delete a chain of filters, we need to notify user-space we are deleting each filters in this chain too. Fixes: 32a4f5ecd738 ("net: sched: introduce chain object to uapi") Cc: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-09-07net_sched: properly cancel netlink dump on failureCong Wang
When nla_put*() fails after nla_nest_start(), we need to call nla_nest_cancel() to cancel the message, otherwise we end up calling nla_nest_end() like a success. Fixes: 0ed5269f9e41 ("net/sched: add tunnel option support to act_tunnel_key") Cc: Davide Caratti <dcaratti@redhat.com> Cc: Simon Horman <simon.horman@netronome.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-09-05net/sched: fix memory leak in act_tunnel_key_init()Davide Caratti
If users try to install act_tunnel_key 'set' rules with duplicate values of 'index', the tunnel metadata are allocated, but never released. Then, kmemleak complains as follows: # tc a a a tunnel_key set src_ip 1.1.1.1 dst_ip 2.2.2.2 id 42 index 111 # echo clear > /sys/kernel/debug/kmemleak # tc a a a tunnel_key set src_ip 1.1.1.1 dst_ip 2.2.2.2 id 42 index 111 Error: TC IDR already exists. We have an error talking to the kernel # echo scan > /sys/kernel/debug/kmemleak # cat /sys/kernel/debug/kmemleak unreferenced object 0xffff8800574e6c80 (size 256): comm "tc", pid 5617, jiffies 4298118009 (age 57.990s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 1c e8 b0 ff ff ff ff ................ 81 24 c2 ad ff ff ff ff 00 00 00 00 00 00 00 00 .$.............. backtrace: [<00000000b7afbf4e>] tunnel_key_init+0x8a5/0x1800 [act_tunnel_key] [<000000007d98fccd>] tcf_action_init_1+0x698/0xac0 [<0000000099b8f7cc>] tcf_action_init+0x15c/0x590 [<00000000dc60eebe>] tc_ctl_action+0x336/0x5c2 [<000000002f5a2f7d>] rtnetlink_rcv_msg+0x357/0x8e0 [<000000000bfe7575>] netlink_rcv_skb+0x124/0x350 [<00000000edab656f>] netlink_unicast+0x40f/0x5d0 [<00000000b322cdcb>] netlink_sendmsg+0x6e8/0xba0 [<0000000063d9d490>] sock_sendmsg+0xb3/0xf0 [<00000000f0d3315a>] ___sys_sendmsg+0x654/0x960 [<00000000c06cbd42>] __sys_sendmsg+0xd3/0x170 [<00000000ce72e4b0>] do_syscall_64+0xa5/0x470 [<000000005caa2d97>] entry_SYSCALL_64_after_hwframe+0x49/0xbe [<00000000fac1b476>] 0xffffffffffffffff This problem theoretically happens also in case users attempt to setup a geneve rule having wrong configuration data, or when the kernel fails to allocate 'params_new'. Ensure that tunnel_key_init() releases the tunnel metadata also in the above conditions. Addresses-Coverity-ID: 1373974 ("Resource leak") Fixes: d0f6dd8a914f4 ("net/sched: Introduce act_tunnel_key") Fixes: 0ed5269f9e41f ("net/sched: add tunnel option support to act_tunnel_key") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-09-04net: sched: action_ife: take reference to meta moduleVlad Buslov
Recent refactoring of add_metainfo() caused use_all_metadata() to add metainfo to ife action metalist without taking reference to module. This causes warning in module_put called from ife action cleanup function. Implement add_metainfo_and_get_ops() function that returns with reference to module taken if metainfo was added successfully, and call it from use_all_metadata(), instead of calling __add_metainfo() directly. Example warning: [ 646.344393] WARNING: CPU: 1 PID: 2278 at kernel/module.c:1139 module_put+0x1cb/0x230 [ 646.352437] Modules linked in: act_meta_skbtcindex act_meta_mark act_meta_skbprio act_ife ife veth nfsv3 nfs fscache xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c tun ebtable_filter ebtables ip6table_filter ip6_tables bridge stp llc mlx5_ib ib_uverbs ib_core intel_rapl sb_edac x86_pkg_temp_thermal mlx5_core coretemp kvm_intel kvm nfsd igb irqbypass crct10dif_pclmul devlink crc32_pclmul mei_me joydev ses crc32c_intel enclosure auth_rpcgss i2c_algo_bit ioatdma ptp mei pps_core ghash_clmulni_intel iTCO_wdt iTCO_vendor_support pcspkr dca ipmi_ssif lpc_ich target_core_mod i2c_i801 ipmi_si ipmi_devintf pcc_cpufreq wmi ipmi_msghandler nfs_acl lockd acpi_pad acpi_power_meter grace sunrpc mpt3sas raid_class scsi_transport_sas [ 646.425631] CPU: 1 PID: 2278 Comm: tc Not tainted 4.19.0-rc1+ #799 [ 646.432187] Hardware name: Supermicro SYS-2028TP-DECR/X10DRT-P, BIOS 2.0b 03/30/2017 [ 646.440595] RIP: 0010:module_put+0x1cb/0x230 [ 646.445238] Code: f3 66 94 02 e8 26 ff fa ff 85 c0 74 11 0f b6 1d 51 30 94 02 80 fb 01 77 60 83 e3 01 74 13 65 ff 0d 3a 83 db 73 e9 2b ff ff ff <0f> 0b e9 00 ff ff ff e8 59 01 fb ff 85 c0 75 e4 48 c7 c2 20 62 6b [ 646.464997] RSP: 0018:ffff880354d37068 EFLAGS: 00010286 [ 646.470599] RAX: 0000000000000000 RBX: ffffffffc0a52518 RCX: ffffffff8c2668db [ 646.478118] RDX: 0000000000000003 RSI: dffffc0000000000 RDI: ffffffffc0a52518 [ 646.485641] RBP: ffffffffc0a52180 R08: fffffbfff814a4a4 R09: fffffbfff814a4a3 [ 646.493164] R10: ffffffffc0a5251b R11: fffffbfff814a4a4 R12: 1ffff1006a9a6e0d [ 646.500687] R13: 00000000ffffffff R14: ffff880362bab890 R15: dead000000000100 [ 646.508213] FS: 00007f4164c99800(0000) GS:ffff88036fe40000(0000) knlGS:0000000000000000 [ 646.516961] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 646.523080] CR2: 00007f41638b8420 CR3: 0000000351df0004 CR4: 00000000001606e0 [ 646.530595] Call Trace: [ 646.533408] ? find_symbol_in_section+0x260/0x260 [ 646.538509] tcf_ife_cleanup+0x11b/0x200 [act_ife] [ 646.543695] tcf_action_cleanup+0x29/0xa0 [ 646.548078] __tcf_action_put+0x5a/0xb0 [ 646.552289] ? nla_put+0x65/0xe0 [ 646.555889] __tcf_idr_release+0x48/0x60 [ 646.560187] tcf_generic_walker+0x448/0x6b0 [ 646.564764] ? tcf_action_dump_1+0x450/0x450 [ 646.569411] ? __lock_is_held+0x84/0x110 [ 646.573720] ? tcf_ife_walker+0x10c/0x20f [act_ife] [ 646.578982] tca_action_gd+0x972/0xc40 [ 646.583129] ? tca_get_fill.constprop.17+0x250/0x250 [ 646.588471] ? mark_lock+0xcf/0x980 [ 646.592324] ? check_chain_key+0x140/0x1f0 [ 646.596832] ? debug_show_all_locks+0x240/0x240 [ 646.601839] ? memset+0x1f/0x40 [ 646.605350] ? nla_parse+0xca/0x1a0 [ 646.609217] tc_ctl_action+0x215/0x230 [ 646.613339] ? tcf_action_add+0x220/0x220 [ 646.617748] rtnetlink_rcv_msg+0x56a/0x6d0 [ 646.622227] ? rtnl_fdb_del+0x3f0/0x3f0 [ 646.626466] netlink_rcv_skb+0x18d/0x200 [ 646.630752] ? rtnl_fdb_del+0x3f0/0x3f0 [ 646.634959] ? netlink_ack+0x500/0x500 [ 646.639106] netlink_unicast+0x2d0/0x370 [ 646.643409] ? netlink_attachskb+0x340/0x340 [ 646.648050] ? _copy_from_iter_full+0xe9/0x3e0 [ 646.652870] ? import_iovec+0x11e/0x1c0 [ 646.657083] netlink_sendmsg+0x3b9/0x6a0 [ 646.661388] ? netlink_unicast+0x370/0x370 [ 646.665877] ? netlink_unicast+0x370/0x370 [ 646.670351] sock_sendmsg+0x6b/0x80 [ 646.674212] ___sys_sendmsg+0x4a1/0x520 [ 646.678443] ? copy_msghdr_from_user+0x210/0x210 [ 646.683463] ? lock_downgrade+0x320/0x320 [ 646.687849] ? debug_show_all_locks+0x240/0x240 [ 646.692760] ? do_raw_spin_unlock+0xa2/0x130 [ 646.697418] ? _raw_spin_unlock+0x24/0x30 [ 646.701798] ? __handle_mm_fault+0x1819/0x1c10 [ 646.706619] ? __pmd_alloc+0x320/0x320 [ 646.710738] ? debug_show_all_locks+0x240/0x240 [ 646.715649] ? restore_nameidata+0x7b/0xa0 [ 646.720117] ? check_chain_key+0x140/0x1f0 [ 646.724590] ? check_chain_key+0x140/0x1f0 [ 646.729070] ? __fget_light+0xbc/0xd0 [ 646.733121] ? __sys_sendmsg+0xd7/0x150 [ 646.737329] __sys_sendmsg+0xd7/0x150 [ 646.741359] ? __ia32_sys_shutdown+0x30/0x30 [ 646.746003] ? up_read+0x53/0x90 [ 646.749601] ? __do_page_fault+0x484/0x780 [ 646.754105] ? do_syscall_64+0x1e/0x2c0 [ 646.758320] do_syscall_64+0x72/0x2c0 [ 646.762353] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 646.767776] RIP: 0033:0x7f4163872150 [ 646.771713] Code: 8b 15 3c 7d 2b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb cd 66 0f 1f 44 00 00 83 3d b9 d5 2b 00 00 75 10 b8 2e 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 be cd 00 00 48 89 04 24 [ 646.791474] RSP: 002b:00007ffdef7d6b58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 646.799721] RAX: ffffffffffffffda RBX: 0000000000000024 RCX: 00007f4163872150 [ 646.807240] RDX: 0000000000000000 RSI: 00007ffdef7d6bd0 RDI: 0000000000000003 [ 646.814760] RBP: 000000005b8b9482 R08: 0000000000000001 R09: 0000000000000000 [ 646.822286] R10: 00000000000005e7 R11: 0000000000000246 R12: 00007ffdef7dad20 [ 646.829807] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000679bc0 [ 646.837360] irq event stamp: 6083 [ 646.841043] hardirqs last enabled at (6081): [<ffffffff8c220a7d>] __call_rcu+0x17d/0x500 [ 646.849882] hardirqs last disabled at (6083): [<ffffffff8c004f06>] trace_hardirqs_off_thunk+0x1a/0x1c [ 646.859775] softirqs last enabled at (5968): [<ffffffff8d4004a1>] __do_softirq+0x4a1/0x6ee [ 646.868784] softirqs last disabled at (6082): [<ffffffffc0a78759>] tcf_ife_cleanup+0x39/0x200 [act_ife] [ 646.878845] ---[ end trace b1b8c12ffe51e657 ]--- Fixes: 5ffe57da29b3 ("act_ife: fix a potential deadlock") Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-09-04act_ife: fix a potential use-after-freeCong Wang
Immediately after module_put(), user could delete this module, so e->ops could be already freed before we call e->ops->release(). Fix this by moving module_put() after ops->release(). Fixes: ef6980b6becb ("introduce IFE action") Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-09-03net: sched: null actions array pointer before releasing actionVlad Buslov
Currently, tcf_action_delete() nulls actions array pointer after putting and deleting it. However, if tcf_idr_delete_index() returns an error, pointer to action is not set to null. That results it being released second time in error handling code of tca_action_gd(). Kasan error: [ 807.367755] ================================================================== [ 807.375844] BUG: KASAN: use-after-free in tc_setup_cb_call+0x14e/0x250 [ 807.382763] Read of size 8 at addr ffff88033e636000 by task tc/2732 [ 807.391289] CPU: 0 PID: 2732 Comm: tc Tainted: G W 4.19.0-rc1+ #799 [ 807.399542] Hardware name: Supermicro SYS-2028TP-DECR/X10DRT-P, BIOS 2.0b 03/30/2017 [ 807.407948] Call Trace: [ 807.410763] dump_stack+0x92/0xeb [ 807.414456] print_address_description+0x70/0x360 [ 807.419549] kasan_report+0x14d/0x300 [ 807.423582] ? tc_setup_cb_call+0x14e/0x250 [ 807.428150] tc_setup_cb_call+0x14e/0x250 [ 807.432539] ? nla_put+0x65/0xe0 [ 807.436146] fl_dump+0x394/0x3f0 [cls_flower] [ 807.440890] ? fl_tmplt_dump+0x140/0x140 [cls_flower] [ 807.446327] ? lock_downgrade+0x320/0x320 [ 807.450702] ? lock_acquire+0xe2/0x220 [ 807.454819] ? is_bpf_text_address+0x5/0x140 [ 807.459475] ? memcpy+0x34/0x50 [ 807.462980] ? nla_put+0x65/0xe0 [ 807.466582] tcf_fill_node+0x341/0x430 [ 807.470717] ? tcf_block_put+0xe0/0xe0 [ 807.474859] tcf_node_dump+0xdb/0xf0 [ 807.478821] fl_walk+0x8e/0x170 [cls_flower] [ 807.483474] tcf_chain_dump+0x35a/0x4d0 [ 807.487703] ? tfilter_notify+0x170/0x170 [ 807.492091] ? tcf_fill_node+0x430/0x430 [ 807.496411] tc_dump_tfilter+0x362/0x3f0 [ 807.500712] ? tc_del_tfilter+0x850/0x850 [ 807.505104] ? kasan_unpoison_shadow+0x30/0x40 [ 807.509940] ? __mutex_unlock_slowpath+0xcf/0x410 [ 807.515031] netlink_dump+0x263/0x4f0 [ 807.519077] __netlink_dump_start+0x2a0/0x300 [ 807.523817] ? tc_del_tfilter+0x850/0x850 [ 807.528198] rtnetlink_rcv_msg+0x46a/0x6d0 [ 807.532671] ? rtnl_fdb_del+0x3f0/0x3f0 [ 807.536878] ? tc_del_tfilter+0x850/0x850 [ 807.541280] netlink_rcv_skb+0x18d/0x200 [ 807.545570] ? rtnl_fdb_del+0x3f0/0x3f0 [ 807.549773] ? netlink_ack+0x500/0x500 [ 807.553913] netlink_unicast+0x2d0/0x370 [ 807.558212] ? netlink_attachskb+0x340/0x340 [ 807.562855] ? _copy_from_iter_full+0xe9/0x3e0 [ 807.567677] ? import_iovec+0x11e/0x1c0 [ 807.571890] netlink_sendmsg+0x3b9/0x6a0 [ 807.576192] ? netlink_unicast+0x370/0x370 [ 807.580684] ? netlink_unicast+0x370/0x370 [ 807.585154] sock_sendmsg+0x6b/0x80 [ 807.589015] ___sys_sendmsg+0x4a1/0x520 [ 807.593230] ? copy_msghdr_from_user+0x210/0x210 [ 807.598232] ? do_wp_page+0x174/0x880 [ 807.602276] ? __handle_mm_fault+0x749/0x1c10 [ 807.607021] ? __handle_mm_fault+0x1046/0x1c10 [ 807.611849] ? __pmd_alloc+0x320/0x320 [ 807.615973] ? check_chain_key+0x140/0x1f0 [ 807.620450] ? check_chain_key+0x140/0x1f0 [ 807.624929] ? __fget_light+0xbc/0xd0 [ 807.628970] ? __sys_sendmsg+0xd7/0x150 [ 807.633172] __sys_sendmsg+0xd7/0x150 [ 807.637201] ? __ia32_sys_shutdown+0x30/0x30 [ 807.641846] ? up_read+0x53/0x90 [ 807.645442] ? __do_page_fault+0x484/0x780 [ 807.649949] ? do_syscall_64+0x1e/0x2c0 [ 807.654164] do_syscall_64+0x72/0x2c0 [ 807.658198] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 807.663625] RIP: 0033:0x7f42e9870150 [ 807.667568] Code: 8b 15 3c 7d 2b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb cd 66 0f 1f 44 00 00 83 3d b9 d5 2b 00 00 75 10 b8 2e 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 be cd 00 00 48 89 04 24 [ 807.687328] RSP: 002b:00007ffdbf595b58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 807.695564] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f42e9870150 [ 807.703083] RDX: 0000000000000000 RSI: 00007ffdbf595b80 RDI: 0000000000000003 [ 807.710605] RBP: 00007ffdbf599d90 R08: 0000000000679bc0 R09: 000000000000000f [ 807.718127] R10: 00000000000005e7 R11: 0000000000000246 R12: 00007ffdbf599d88 [ 807.725651] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 807.735048] Allocated by task 2687: [ 807.738902] kasan_kmalloc+0xa0/0xd0 [ 807.742852] __kmalloc+0x118/0x2d0 [ 807.746615] tcf_idr_create+0x44/0x320 [ 807.750738] tcf_nat_init+0x41e/0x530 [act_nat] [ 807.755638] tcf_action_init_1+0x4e0/0x650 [ 807.760104] tcf_action_init+0x1ce/0x2d0 [ 807.764395] tcf_exts_validate+0x1d8/0x200 [ 807.768861] fl_change+0x55a/0x26b4 [cls_flower] [ 807.773845] tc_new_tfilter+0x748/0xa20 [ 807.778051] rtnetlink_rcv_msg+0x56a/0x6d0 [ 807.782517] netlink_rcv_skb+0x18d/0x200 [ 807.786804] netlink_unicast+0x2d0/0x370 [ 807.791095] netlink_sendmsg+0x3b9/0x6a0 [ 807.795387] sock_sendmsg+0x6b/0x80 [ 807.799240] ___sys_sendmsg+0x4a1/0x520 [ 807.803445] __sys_sendmsg+0xd7/0x150 [ 807.807473] do_syscall_64+0x72/0x2c0 [ 807.811506] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 807.818776] Freed by task 2728: [ 807.822283] __kasan_slab_free+0x122/0x180 [ 807.826752] kfree+0xf4/0x2f0 [ 807.830080] __tcf_action_put+0x5a/0xb0 [ 807.834281] tcf_action_put_many+0x46/0x70 [ 807.838747] tca_action_gd+0x232/0xc40 [ 807.842862] tc_ctl_action+0x215/0x230 [ 807.846977] rtnetlink_rcv_msg+0x56a/0x6d0 [ 807.851444] netlink_rcv_skb+0x18d/0x200 [ 807.855731] netlink_unicast+0x2d0/0x370 [ 807.860021] netlink_sendmsg+0x3b9/0x6a0 [ 807.864312] sock_sendmsg+0x6b/0x80 [ 807.868166] ___sys_sendmsg+0x4a1/0x520 [ 807.872372] __sys_sendmsg+0xd7/0x150 [ 807.876401] do_syscall_64+0x72/0x2c0 [ 807.880431] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 807.887704] The buggy address belongs to the object at ffff88033e636000 which belongs to the cache kmalloc-256 of size 256 [ 807.900909] The buggy address is located 0 bytes inside of 256-byte region [ffff88033e636000, ffff88033e636100) [ 807.913155] The buggy address belongs to the page: [ 807.918322] page:ffffea000cf98d80 count:1 mapcount:0 mapping:ffff88036f80ee00 index:0x0 compound_mapcount: 0 [ 807.928831] flags: 0x5fff8000008100(slab|head) [ 807.933647] raw: 005fff8000008100 ffffea000db44f00 0000000400000004 ffff88036f80ee00 [ 807.942050] raw: 0000000000000000 0000000080190019 00000001ffffffff 0000000000000000 [ 807.950456] page dumped because: kasan: bad access detected [ 807.958240] Memory state around the buggy address: [ 807.963405] ffff88033e635f00: fc fc fc fc fb fb fb fb fb fb fb fc fc fc fc fb [ 807.971288] ffff88033e635f80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc [ 807.979166] >ffff88033e636000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 807.994882] ^ [ 807.998477] ffff88033e636080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 808.006352] ffff88033e636100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 808.014230] ================================================================== [ 808.022108] Disabling lock debugging due to kernel taint Fixes: edfaf94fa705 ("net_sched: improve and refactor tcf_action_put_many()") Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-29net_sched: reject unknown tcfa_action valuesPaolo Abeni
After the commit 802bfb19152c ("net/sched: user-space can't set unknown tcfa_action values"), unknown tcfa_action values are converted to TC_ACT_UNSPEC, but the common agreement is instead rejecting such configurations. This change also introduces a helper to simplify the destruction of a single action, avoiding code duplication. v1 -> v2: - helper is now static and renamed according to act_* convention - updated extack message, according to the new behavior Fixes: 802bfb19152c ("net/sched: user-space can't set unknown tcfa_action values") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-29net/sched: act_pedit: fix dump of extended layered opDavide Caratti
in the (rare) case of failure in nla_nest_start(), missing NULL checks in tcf_pedit_key_ex_dump() can make the following command # tc action add action pedit ex munge ip ttl set 64 dereference a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 PGD 800000007d1cd067 P4D 800000007d1cd067 PUD 7acd3067 PMD 0 Oops: 0002 [#1] SMP PTI CPU: 0 PID: 3336 Comm: tc Tainted: G E 4.18.0.pedit+ #425 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 RIP: 0010:tcf_pedit_dump+0x19d/0x358 [act_pedit] Code: be 02 00 00 00 48 89 df 66 89 44 24 20 e8 9b b1 fd e0 85 c0 75 46 8b 83 c8 00 00 00 49 83 c5 08 48 03 83 d0 00 00 00 4d 39 f5 <66> 89 04 25 00 00 00 00 0f 84 81 01 00 00 41 8b 45 00 48 8d 4c 24 RSP: 0018:ffffb5d4004478a8 EFLAGS: 00010246 RAX: ffff8880fcda2070 RBX: ffff8880fadd2900 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffb5d4004478ca RDI: ffff8880fcda206e RBP: ffff8880fb9cb900 R08: 0000000000000008 R09: ffff8880fcda206e R10: ffff8880fadd2900 R11: 0000000000000000 R12: ffff8880fd26cf40 R13: ffff8880fc957430 R14: ffff8880fc957430 R15: ffff8880fb9cb988 FS: 00007f75a537a740(0000) GS:ffff8880fda00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007a2fa005 CR4: 00000000001606f0 Call Trace: ? __nla_reserve+0x38/0x50 tcf_action_dump_1+0xd2/0x130 tcf_action_dump+0x6a/0xf0 tca_get_fill.constprop.31+0xa3/0x120 tcf_action_add+0xd1/0x170 tc_ctl_action+0x137/0x150 rtnetlink_rcv_msg+0x263/0x2d0 ? _cond_resched+0x15/0x40 ? rtnl_calcit.isra.30+0x110/0x110 netlink_rcv_skb+0x4d/0x130 netlink_unicast+0x1a3/0x250 netlink_sendmsg+0x2ae/0x3a0 sock_sendmsg+0x36/0x40 ___sys_sendmsg+0x26f/0x2d0 ? do_wp_page+0x8e/0x5f0 ? handle_pte_fault+0x6c3/0xf50 ? __handle_mm_fault+0x38e/0x520 ? __sys_sendmsg+0x5e/0xa0 __sys_sendmsg+0x5e/0xa0 do_syscall_64+0x5b/0x180 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f75a4583ba0 Code: c3 48 8b 05 f2 62 2c 00 f7 db 64 89 18 48 83 cb ff eb dd 0f 1f 80 00 00 00 00 83 3d fd c3 2c 00 00 75 10 b8 2e 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae cc 00 00 48 89 04 24 RSP: 002b:00007fff60ee7418 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fff60ee7540 RCX: 00007f75a4583ba0 RDX: 0000000000000000 RSI: 00007fff60ee7490 RDI: 0000000000000003 RBP: 000000005b842d3e R08: 0000000000000002 R09: 0000000000000000 R10: 00007fff60ee6ea0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff60ee7554 R14: 0000000000000001 R15: 000000000066c100 Modules linked in: act_pedit(E) ip6table_filter ip6_tables iptable_filter binfmt_misc crct10dif_pclmul ext4 crc32_pclmul mbcache ghash_clmulni_intel jbd2 pcbc snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_seq snd_seq_device snd_pcm aesni_intel crypto_simd snd_timer cryptd glue_helper snd joydev pcspkr soundcore virtio_balloon i2c_piix4 nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c ata_generic pata_acpi virtio_net net_failover virtio_blk virtio_console failover qxl crc32c_intel drm_kms_helper syscopyarea serio_raw sysfillrect sysimgblt fb_sys_fops ttm drm ata_piix virtio_pci libata virtio_ring i2c_core virtio floppy dm_mirror dm_region_hash dm_log dm_mod [last unloaded: act_pedit] CR2: 0000000000000000 Like it's done for other TC actions, give up dumping pedit rules and return an error if nla_nest_start() returns NULL. Fixes: 71d0ed7079df ("net/act_pedit: Support using offset relative to the conventional network headers") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-27net: sched: return -ENOENT when trying to remove filter from non-existent chainJiri Pirko
When chain 0 was implicitly created, removal of non-existent filter from chain 0 gave -ENOENT. Once chain 0 became non-implicit, the same call is giving -EINVAL. Fix this by returning -ENOENT in that case. Reported-by: Roman Mashak <mrv@mojatatu.com> Fixes: f71e0ca4db18 ("net: sched: Avoid implicit chain 0 creation") Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-27net: sched: fix extack error message when chain is failed to be createdJiri Pirko
Instead "Cannot find" say "Cannot create". Fixes: c35a4acc2985 ("net: sched: cls_api: handle generic cls errors") Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-26net: sched: Fix memory exposure from short TCA_U32_SELKees Cook
Via u32_change(), TCA_U32_SEL has an unspecified type in the netlink policy, so max length isn't enforced, only minimum. This means nkeys (from userspace) was being trusted without checking the actual size of nla_len(), which could lead to a memory over-read, and ultimately an exposure via a call to u32_dump(). Reachability is CAP_NET_ADMIN within a namespace. Reported-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Cong Wang <xiyou.wangcong@gmail.com> Cc: Jiri Pirko <jiri@resnulli.us> Cc: "David S. Miller" <davem@davemloft.net> Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-22sch_cake: Fix TC filter flow override and expand it to hosts as wellToke Høiland-Jørgensen
The TC filter flow mapping override completely skipped the call to cake_hash(); however that meant that the internal state was not being updated, which ultimately leads to deadlocks in some configurations. Fix that by passing the overridden flow ID into cake_hash() instead so it can react appropriately. In addition, the major number of the class ID can now be set to override the host mapping in host isolation mode. If both host and flow are overridden (or if the respective modes are disabled), flow dissection and hashing will be skipped entirely; otherwise, the hashing will be kept for the portions that are not set by the filter. Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-21act_ife: fix a potential deadlockCong Wang
use_all_metadata() acquires read_lock(&ife_mod_lock), then calls add_metainfo() which calls find_ife_oplist() which acquires the same lock again. Deadlock! Introduce __add_metainfo() which accepts struct tcf_meta_ops *ops as an additional parameter and let its callers to decide how to find it. For use_all_metadata(), it already has ops, no need to find it again, just call __add_metainfo() directly. And, as ife_mod_lock is only needed for find_ife_oplist(), this means we can make non-atomic allocation for populate_metalist() now. Fixes: 817e9f2c5c26 ("act_ife: acquire ife_mod_lock before reading ifeoplist") Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-21act_ife: move tcfa_lock down to where necessaryCong Wang
The only time we need to take tcfa_lock is when adding a new metainfo to an existing ife->metalist. We don't need to take tcfa_lock so early and so broadly in tcf_ife_init(). This means we can always take ife_mod_lock first, avoid the reverse locking ordering warning as reported by Vlad. Reported-by: Vlad Buslov <vladbu@mellanox.com> Tested-by: Vlad Buslov <vladbu@mellanox.com> Cc: Vlad Buslov <vladbu@mellanox.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-21Revert "net: sched: act_ife: disable bh when taking ife_mod_lock"Cong Wang
This reverts commit 42c625a486f3 ("net: sched: act_ife: disable bh when taking ife_mod_lock"), because what ife_mod_lock protects is absolutely not touched in rate est timer BH context, they have no race. A better fix is following up. Cc: Vlad Buslov <vladbu@mellanox.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-21net_sched: remove list_head from tc_actionCong Wang
After commit 90b73b77d08e, list_head is no longer needed. Now we just need to convert the list iteration to array iteration for drivers. Fixes: 90b73b77d08e ("net: sched: change action API to use array of pointers to actions") Cc: Jiri Pirko <jiri@mellanox.com> Cc: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-21net_sched: remove unused tcf_idr_check()Cong Wang
tcf_idr_check() is replaced by tcf_idr_check_alloc(), and __tcf_idr_check() now can be folded into tcf_idr_search(). Fixes: 0190c1d452a9 ("net: sched: atomically check-allocate action") Cc: Jiri Pirko <jiri@mellanox.com> Cc: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-21net_sched: remove unused parameter for tcf_action_delete()Cong Wang
Fixes: 16af6067392c ("net: sched: implement reference counted action release") Cc: Jiri Pirko <jiri@mellanox.com> Cc: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-21net_sched: remove unnecessary ops->delete()Cong Wang
All ops->delete() wants is getting the tn->idrinfo, but we already have tc_action before calling ops->delete(), and tc_action has a pointer ->idrinfo. More importantly, each type of action does the same thing, that is, just calling tcf_idr_delete_index(). So it can be just removed. Fixes: b409074e6693 ("net: sched: add 'delete' function to action ops") Cc: Jiri Pirko <jiri@mellanox.com> Cc: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-21net_sched: improve and refactor tcf_action_put_many()Cong Wang
tcf_action_put_many() is mostly called to clean up actions on failure path, but tcf_action_put_many(&actions[acts_deleted]) is used in the ugliest way: it passes a slice of the array and uses an additional NULL at the end to avoid out-of-bound access. acts_deleted is completely unnecessary since we can teach tcf_action_put_many() scan the whole array and checks against NULL pointer. Which also means tcf_action_delete() should set deleted action pointers to NULL to avoid double free. Fixes: 90b73b77d08e ("net: sched: change action API to use array of pointers to actions") Cc: Jiri Pirko <jiri@mellanox.com> Cc: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-21sch_cake: Remove unused including <linux/version.h>Yue Haibing
Remove including <linux/version.h> that don't need it. Signed-off-by: Yue Haibing <yuehaibing@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-19net: sched: always disable bh when taking tcf_lockVlad Buslov
Recently, ops->init() and ops->dump() of all actions were modified to always obtain tcf_lock when accessing private action state. Actions that don't depend on tcf_lock for synchronization with their data path use non-bh locking API. However, tcf_lock is also used to protect rate estimator stats in softirq context by timer callback. Change ops->init() and ops->dump() of all actions to disable bh when using tcf_lock to prevent deadlock reported by following lockdep warning: [ 105.470398] ================================ [ 105.475014] WARNING: inconsistent lock state [ 105.479628] 4.18.0-rc8+ #664 Not tainted [ 105.483897] -------------------------------- [ 105.488511] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 105.494871] swapper/16/0 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 105.500449] 00000000f86c012e (&(&p->tcfa_lock)->rlock){+.?.}, at: est_fetch_counters+0x3c/0xa0 [ 105.509696] {SOFTIRQ-ON-W} state was registered at: [ 105.514925] _raw_spin_lock+0x2c/0x40 [ 105.519022] tcf_bpf_init+0x579/0x820 [act_bpf] [ 105.523990] tcf_action_init_1+0x4e4/0x660 [ 105.528518] tcf_action_init+0x1ce/0x2d0 [ 105.532880] tcf_exts_validate+0x1d8/0x200 [ 105.537416] fl_change+0x55a/0x268b [cls_flower] [ 105.542469] tc_new_tfilter+0x748/0xa20 [ 105.546738] rtnetlink_rcv_msg+0x56a/0x6d0 [ 105.551268] netlink_rcv_skb+0x18d/0x200 [ 105.555628] netlink_unicast+0x2d0/0x370 [ 105.559990] netlink_sendmsg+0x3b9/0x6a0 [ 105.564349] sock_sendmsg+0x6b/0x80 [ 105.568271] ___sys_sendmsg+0x4a1/0x520 [ 105.572547] __sys_sendmsg+0xd7/0x150 [ 105.576655] do_syscall_64+0x72/0x2c0 [ 105.580757] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 105.586243] irq event stamp: 489296 [ 105.590084] hardirqs last enabled at (489296): [<ffffffffb507e639>] _raw_spin_unlock_irq+0x29/0x40 [ 105.599765] hardirqs last disabled at (489295): [<ffffffffb507e745>] _raw_spin_lock_irq+0x15/0x50 [ 105.609277] softirqs last enabled at (489292): [<ffffffffb413a6a3>] irq_enter+0x83/0xa0 [ 105.618001] softirqs last disabled at (489293): [<ffffffffb413a800>] irq_exit+0x140/0x190 [ 105.626813] other info that might help us debug this: [ 105.633976] Possible unsafe locking scenario: [ 105.640526] CPU0 [ 105.643325] ---- [ 105.646125] lock(&(&p->tcfa_lock)->rlock); [ 105.650747] <Interrupt> [ 105.653717] lock(&(&p->tcfa_lock)->rlock); [ 105.658514] *** DEADLOCK *** [ 105.665349] 1 lock held by swapper/16/0: [ 105.669629] #0: 00000000a640ad99 ((&est->timer)){+.-.}, at: call_timer_fn+0x10b/0x550 [ 105.678200] stack backtrace: [ 105.683194] CPU: 16 PID: 0 Comm: swapper/16 Not tainted 4.18.0-rc8+ #664 [ 105.690249] Hardware name: Supermicro SYS-2028TP-DECR/X10DRT-P, BIOS 2.0b 03/30/2017 [ 105.698626] Call Trace: [ 105.701421] <IRQ> [ 105.703791] dump_stack+0x92/0xeb [ 105.707461] print_usage_bug+0x336/0x34c [ 105.711744] mark_lock+0x7c9/0x980 [ 105.715500] ? print_shortest_lock_dependencies+0x2e0/0x2e0 [ 105.721424] ? check_usage_forwards+0x230/0x230 [ 105.726315] __lock_acquire+0x923/0x26f0 [ 105.730597] ? debug_show_all_locks+0x240/0x240 [ 105.735478] ? mark_lock+0x493/0x980 [ 105.739412] ? check_chain_key+0x140/0x1f0 [ 105.743861] ? __lock_acquire+0x836/0x26f0 [ 105.748323] ? lock_acquire+0x12e/0x290 [ 105.752516] lock_acquire+0x12e/0x290 [ 105.756539] ? est_fetch_counters+0x3c/0xa0 [ 105.761084] _raw_spin_lock+0x2c/0x40 [ 105.765099] ? est_fetch_counters+0x3c/0xa0 [ 105.769633] est_fetch_counters+0x3c/0xa0 [ 105.773995] est_timer+0x87/0x390 [ 105.777670] ? est_fetch_counters+0xa0/0xa0 [ 105.782210] ? lock_acquire+0x12e/0x290 [ 105.786410] call_timer_fn+0x161/0x550 [ 105.790512] ? est_fetch_counters+0xa0/0xa0 [ 105.795055] ? del_timer_sync+0xd0/0xd0 [ 105.799249] ? __lock_is_held+0x93/0x110 [ 105.803531] ? mark_held_locks+0x20/0xe0 [ 105.807813] ? _raw_spin_unlock_irq+0x29/0x40 [ 105.812525] ? est_fetch_counters+0xa0/0xa0 [ 105.817069] ? est_fetch_counters+0xa0/0xa0 [ 105.821610] run_timer_softirq+0x3c4/0x9f0 [ 105.826064] ? lock_acquire+0x12e/0x290 [ 105.830257] ? __bpf_trace_timer_class+0x10/0x10 [ 105.835237] ? __lock_is_held+0x25/0x110 [ 105.839517] __do_softirq+0x11d/0x7bf [ 105.843542] irq_exit+0x140/0x190 [ 105.847208] smp_apic_timer_interrupt+0xac/0x3b0 [ 105.852182] apic_timer_interrupt+0xf/0x20 [ 105.856628] </IRQ> [ 105.859081] RIP: 0010:cpuidle_enter_state+0xd8/0x4d0 [ 105.864395] Code: 46 ff 48 89 44 24 08 0f 1f 44 00 00 31 ff e8 cf ec 46 ff 80 7c 24 07 00 0f 85 1d 02 00 00 e8 9f 90 4b ff fb 66 0f 1f 44 00 00 <4c> 8b 6c 24 08 4d 29 fd 0f 80 36 03 00 00 4c 89 e8 48 ba cf f7 53 [ 105.884288] RSP: 0018:ffff8803ad94fd20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 105.892494] RAX: 0000000000000000 RBX: ffffe8fb300829c0 RCX: ffffffffb41e19e1 [ 105.899988] RDX: 0000000000000007 RSI: dffffc0000000000 RDI: ffff8803ad9358ac [ 105.907503] RBP: ffffffffb6636300 R08: 0000000000000004 R09: 0000000000000000 [ 105.914997] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 105.922487] R13: ffffffffb6636140 R14: ffffffffb66362d8 R15: 000000188d36091b [ 105.929988] ? trace_hardirqs_on_caller+0x141/0x2d0 [ 105.935232] do_idle+0x28e/0x320 [ 105.938817] ? arch_cpu_idle_exit+0x40/0x40 [ 105.943361] ? mark_lock+0x8c1/0x980 [ 105.947295] ? _raw_spin_unlock_irqrestore+0x32/0x60 [ 105.952619] cpu_startup_entry+0xc2/0xd0 [ 105.956900] ? cpu_in_idle+0x20/0x20 [ 105.960830] ? _raw_spin_unlock_irqrestore+0x32/0x60 [ 105.966146] ? trace_hardirqs_on_caller+0x141/0x2d0 [ 105.971391] start_secondary+0x2b5/0x360 [ 105.975669] ? set_cpu_sibling_map+0x1330/0x1330 [ 105.980654] secondary_startup_64+0xa5/0xb0 Taking tcf_lock in sample action with bh disabled causes lockdep to issue a warning regarding possible irq lock inversion dependency between tcf_lock, and psample_groups_lock that is taken when holding tcf_lock in sample init: [ 162.108959] Possible interrupt unsafe locking scenario: [ 162.116386] CPU0 CPU1 [ 162.121277] ---- ---- [ 162.126162] lock(psample_groups_lock); [ 162.130447] local_irq_disable(); [ 162.136772] lock(&(&p->tcfa_lock)->rlock); [ 162.143957] lock(psample_groups_lock); [ 162.150813] <Interrupt> [ 162.153808] lock(&(&p->tcfa_lock)->rlock); [ 162.158608] *** DEADLOCK *** In order to prevent potential lock inversion dependency between tcf_lock and psample_groups_lock, extract call to psample_group_get() from tcf_lock protected section in sample action init function. Fixes: 4e232818bd32 ("net: sched: act_mirred: remove dependency on rtnl lock") Fixes: 764e9a24480f ("net: sched: act_vlan: remove dependency on rtnl lock") Fixes: 729e01260989 ("net: sched: act_tunnel_key: remove dependency on rtnl lock") Fixes: d77284956656 ("net: sched: act_sample: remove dependency on rtnl lock") Fixes: e8917f437006 ("net: sched: act_gact: remove dependency on rtnl lock") Fixes: b6a2b971c0b0 ("net: sched: act_csum: remove dependency on rtnl lock") Fixes: 2142236b4584 ("net: sched: act_bpf: remove dependency on rtnl lock") Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-16net: sched: act_ife: always release ife action on init errorVlad Buslov
Action init API was changed to always take reference to action, even when overwriting existing action. Substitute conditional action release, which was executed only if action is newly created, with unconditional release in tcf_ife_init() error handling code to prevent double free or memory leak in case of overwrite. Fixes: 4e8ddd7f1758 ("net: sched: don't release reference on action overwrite") Reported-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-16cls_matchall: fix tcf_unbind_filter missingHangbin Liu
Fix tcf_unbind_filter missing in cls_matchall as this will trigger WARN_ON() in cbq_destroy_class(). Fixes: fd62d9f5c575f ("net/sched: matchall: Fix configuration race") Reported-by: Li Shuang <shuali@redhat.com> Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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