From 81d947e2b8dd2394586c3eaffdd2357797d3bf59 Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Mon, 15 Jan 2018 23:12:09 +0100 Subject: [PATCH] net, sched: fix panic when updating miniq {b,q}stats While working on fixing another bug, I ran into the following panic on arm64 by simply attaching clsact qdisc, adding a filter and running traffic on ingress to it: [...] [ 178.188591] Unable to handle kernel read from unreadable memory at virtual address 810fb501f000 [ 178.197314] Mem abort info: [ 178.200121] ESR = 0x96000004 [ 178.203168] Exception class = DABT (current EL), IL = 32 bits [ 178.209095] SET = 0, FnV = 0 [ 178.212157] EA = 0, S1PTW = 0 [ 178.215288] Data abort info: [ 178.218175] ISV = 0, ISS = 0x00000004 [ 178.222019] CM = 0, WnR = 0 [ 178.224997] user pgtable: 4k pages, 48-bit VAs, pgd = 0000000023cb3f33 [ 178.231531] [0000810fb501f000] *pgd=0000000000000000 [ 178.236508] Internal error: Oops: 96000004 [#1] SMP [...] [ 178.311855] CPU: 73 PID: 2497 Comm: ping Tainted: G W 4.15.0-rc7+ #5 [ 178.319413] Hardware name: FOXCONN R2-1221R-A4/C2U4N_MB, BIOS G31FB18A 03/31/2017 [ 178.326887] pstate: 60400005 (nZCv daif +PAN -UAO) [ 178.331685] pc : __netif_receive_skb_core+0x49c/0xac8 [ 178.336728] lr : __netif_receive_skb+0x28/0x78 [ 178.341161] sp : ffff00002344b750 [ 178.344465] x29: ffff00002344b750 x28: ffff810fbdfd0580 [ 178.349769] x27: 0000000000000000 x26: ffff000009378000 [...] [ 178.418715] x1 : 0000000000000054 x0 : 0000000000000000 [ 178.424020] Process ping (pid: 2497, stack limit = 0x000000009f0a3ff4) [ 178.430537] Call trace: [ 178.432976] __netif_receive_skb_core+0x49c/0xac8 [ 178.437670] __netif_receive_skb+0x28/0x78 [ 178.441757] process_backlog+0x9c/0x160 [ 178.445584] net_rx_action+0x2f8/0x3f0 [...] Reason is that sch_ingress and sch_clsact are doing mini_qdisc_pair_init() which sets up miniq pointers to cpu_{b,q}stats from the underlying qdisc. Problem is that this cannot work since they are actually set up right after the qdisc ->init() callback in qdisc_create(), so first packet going into sch_handle_ingress() tries to call mini_qdisc_bstats_cpu_update() and we therefore panic. In order to fix this, allocation of {b,q}stats needs to happen before we call into ->init(). In net-next, there's already such option through commit d59f5ffa59d8 ("net: sched: a dflt qdisc may be used with per cpu stats"). However, the bug needs to be fixed in net still for 4.15. Thus, include these bits to reduce any merge churn and reuse the static_flags field to set TCQ_F_CPUSTATS, and remove the allocation from qdisc_create() since there is no other user left. Prashant Bhole ran into the same issue but for net-next, thus adding him below as well as co-author. Same issue was also reported by Sandipan Das when using bcc. Fixes: 46209401f8f6 ("net: core: introduce mini_Qdisc and eliminate usage of tp->q for clsact fastpath") Reference: https://lists.iovisor.org/pipermail/iovisor-dev/2018-January/001190.html Reported-by: Sandipan Das Co-authored-by: Prashant Bhole Co-authored-by: John Fastabend Signed-off-by: Daniel Borkmann Cc: Jiri Pirko Signed-off-by: David S. Miller --- include/net/sch_generic.h | 2 ++ net/sched/sch_api.c | 15 +-------------- net/sched/sch_generic.c | 18 +++++++++++++++++- net/sched/sch_ingress.c | 19 ++++--------------- 4 files changed, 24 insertions(+), 30 deletions(-) diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index 83a3e47d5845..becf86aa4ac6 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -179,6 +179,7 @@ struct Qdisc_ops { const struct Qdisc_class_ops *cl_ops; char id[IFNAMSIZ]; int priv_size; + unsigned int static_flags; int (*enqueue)(struct sk_buff *skb, struct Qdisc *sch, @@ -444,6 +445,7 @@ void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, unsigned int len); struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, const struct Qdisc_ops *ops); +void qdisc_free(struct Qdisc *qdisc); struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, const struct Qdisc_ops *ops, u32 parentid); void __qdisc_calculate_pkt_len(struct sk_buff *skb, diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 0f1eab99ff4e..52529b7f8d96 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1063,17 +1063,6 @@ static struct Qdisc *qdisc_create(struct net_device *dev, } if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { - if (qdisc_is_percpu_stats(sch)) { - sch->cpu_bstats = - netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); - if (!sch->cpu_bstats) - goto err_out4; - - sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); - if (!sch->cpu_qstats) - goto err_out4; - } - if (tca[TCA_STAB]) { stab = qdisc_get_stab(tca[TCA_STAB]); if (IS_ERR(stab)) { @@ -1115,7 +1104,7 @@ static struct Qdisc *qdisc_create(struct net_device *dev, ops->destroy(sch); err_out3: dev_put(dev); - kfree((char *) sch - sch->padded); + qdisc_free(sch); err_out2: module_put(ops->owner); err_out: @@ -1123,8 +1112,6 @@ err_out: return NULL; err_out4: - free_percpu(sch->cpu_bstats); - free_percpu(sch->cpu_qstats); /* * Any broken qdiscs that would require a ops->reset() here? * The qdisc was never in action so it shouldn't be necessary. diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 661c7144b53a..cac003fddf3e 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -633,6 +633,19 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, qdisc_skb_head_init(&sch->q); spin_lock_init(&sch->q.lock); + if (ops->static_flags & TCQ_F_CPUSTATS) { + sch->cpu_bstats = + netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); + if (!sch->cpu_bstats) + goto errout1; + + sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); + if (!sch->cpu_qstats) { + free_percpu(sch->cpu_bstats); + goto errout1; + } + } + spin_lock_init(&sch->busylock); lockdep_set_class(&sch->busylock, dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); @@ -642,6 +655,7 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, dev->qdisc_running_key ?: &qdisc_running_key); sch->ops = ops; + sch->flags = ops->static_flags; sch->enqueue = ops->enqueue; sch->dequeue = ops->dequeue; sch->dev_queue = dev_queue; @@ -649,6 +663,8 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, refcount_set(&sch->refcnt, 1); return sch; +errout1: + kfree(p); errout: return ERR_PTR(err); } @@ -698,7 +714,7 @@ void qdisc_reset(struct Qdisc *qdisc) } EXPORT_SYMBOL(qdisc_reset); -static void qdisc_free(struct Qdisc *qdisc) +void qdisc_free(struct Qdisc *qdisc) { if (qdisc_is_percpu_stats(qdisc)) { free_percpu(qdisc->cpu_bstats); diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c index fc1286f499c1..003e1b063447 100644 --- a/net/sched/sch_ingress.c +++ b/net/sched/sch_ingress.c @@ -66,7 +66,6 @@ static int ingress_init(struct Qdisc *sch, struct nlattr *opt) { struct ingress_sched_data *q = qdisc_priv(sch); struct net_device *dev = qdisc_dev(sch); - int err; net_inc_ingress_queue(); @@ -76,13 +75,7 @@ static int ingress_init(struct Qdisc *sch, struct nlattr *opt) q->block_info.chain_head_change = clsact_chain_head_change; q->block_info.chain_head_change_priv = &q->miniqp; - err = tcf_block_get_ext(&q->block, sch, &q->block_info); - if (err) - return err; - - sch->flags |= TCQ_F_CPUSTATS; - - return 0; + return tcf_block_get_ext(&q->block, sch, &q->block_info); } static void ingress_destroy(struct Qdisc *sch) @@ -121,6 +114,7 @@ static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { .cl_ops = &ingress_class_ops, .id = "ingress", .priv_size = sizeof(struct ingress_sched_data), + .static_flags = TCQ_F_CPUSTATS, .init = ingress_init, .destroy = ingress_destroy, .dump = ingress_dump, @@ -192,13 +186,7 @@ static int clsact_init(struct Qdisc *sch, struct nlattr *opt) q->egress_block_info.chain_head_change = clsact_chain_head_change; q->egress_block_info.chain_head_change_priv = &q->miniqp_egress; - err = tcf_block_get_ext(&q->egress_block, sch, &q->egress_block_info); - if (err) - return err; - - sch->flags |= TCQ_F_CPUSTATS; - - return 0; + return tcf_block_get_ext(&q->egress_block, sch, &q->egress_block_info); } static void clsact_destroy(struct Qdisc *sch) @@ -225,6 +213,7 @@ static struct Qdisc_ops clsact_qdisc_ops __read_mostly = { .cl_ops = &clsact_class_ops, .id = "clsact", .priv_size = sizeof(struct clsact_sched_data), + .static_flags = TCQ_F_CPUSTATS, .init = clsact_init, .destroy = clsact_destroy, .dump = ingress_dump,