mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 22:56:44 +07:00
0da2dbd602
the following script: # tc qdisc add dev crash0 clsact # tc filter add dev crash0 egress matchall \ > action gact pass index 90 # tc actions replace action gact \ > goto chain 42 index 90 cookie c1a0c1a0 # tc actions show action gact had the following output: Error: Failed to init TC action chain. We have an error talking to the kernel total acts 1 action order 0: gact action goto chain 42 random type none pass val 0 index 90 ref 2 bind 1 cookie c1a0c1a0 Then, the first packet transmitted by crash0 made the kernel crash: BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 #PF error: [normal kernel read fault] PGD 0 P4D 0 Oops: 0000 [#1] SMP PTI CPU: 2 PID: 0 Comm: swapper/2 Not tainted 5.0.0-rc4.gotochain_crash+ #533 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 RIP: 0010:tcf_action_exec+0xb8/0x100 Code: 00 00 00 20 74 1d 83 f8 03 75 09 49 83 c4 08 4d 39 ec 75 bc 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 49 8b 97 a8 00 00 00 <48> 8b 12 48 89 55 00 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 RSP: 0018:ffff8c2434703be0 EFLAGS: 00010246 RAX: 000000002000002a RBX: ffff8c23ed6d7e00 RCX: 000000000000005a RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8c23ed6d7e00 RBP: ffff8c2434703c80 R08: ffff8c243b639ac8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8c2429e68b00 R13: ffff8c2429e68b08 R14: 0000000000000001 R15: ffff8c2429c5a480 FS: 0000000000000000(0000) GS:ffff8c2434700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002dc0e005 CR4: 00000000001606e0 Call Trace: <IRQ> tcf_classify+0x58/0x120 __dev_queue_xmit+0x40a/0x890 ? ip6_finish_output2+0x369/0x590 ip6_finish_output2+0x369/0x590 ? ip6_output+0x68/0x110 ip6_output+0x68/0x110 ? nf_hook.constprop.35+0x79/0xc0 mld_sendpack+0x16f/0x220 mld_ifc_timer_expire+0x195/0x2c0 ? igmp6_timer_handler+0x70/0x70 call_timer_fn+0x2b/0x130 run_timer_softirq+0x3e8/0x440 ? tick_sched_timer+0x37/0x70 __do_softirq+0xe3/0x2f5 irq_exit+0xf0/0x100 smp_apic_timer_interrupt+0x6c/0x130 apic_timer_interrupt+0xf/0x20 </IRQ> RIP: 0010:native_safe_halt+0x2/0x10 Code: 74 ff ff ff 7f f3 c3 65 48 8b 04 25 00 5c 01 00 f0 80 48 02 20 48 8b 00 a8 08 74 8b eb c1 90 90 90 90 90 90 90 90 90 90 fb f4 <c3> 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f4 c3 90 90 90 90 90 90 RSP: 0018:ffff9c8640387eb8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff8b2184f0 RBX: 0000000000000002 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000087 RDI: 0000000000000002 RBP: 0000000000000002 R08: 000eb57882b36cc3 R09: 0000000000000020 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? __sched_text_end+0x1/0x1 default_idle+0x1c/0x140 do_idle+0x1c4/0x280 cpu_startup_entry+0x19/0x20 start_secondary+0x1a7/0x200 secondary_startup_64+0xa4/0xb0 Modules linked in: act_gact act_bpf veth ip6table_filter ip6_tables iptable_filter binfmt_misc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_generic ext4 snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core mbcache jbd2 snd_seq snd_seq_device snd_pcm aesni_intel crypto_simd cryptd glue_helper virtio_balloon joydev pcspkr snd_timer snd i2c_piix4 soundcore nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs ata_generic pata_acpi qxl drm_kms_helper syscopyarea virtio_net sysfillrect net_failover virtio_blk sysimgblt fb_sys_fops virtio_console ttm failover drm crc32c_intel serio_raw ata_piix libata floppy virtio_pci virtio_ring virtio dm_mirror dm_region_hash dm_log dm_mod [last unloaded: act_bpf] CR2: 0000000000000000 Validating the control action within tcf_gact_init() proved to fix the above issue. A TDC selftest is added to verify the correct behavior. Fixes:db50514f9a
("net: sched: add termination action to allow goto chain") Fixes:97763dc0f4
("net_sched: reject unknown tcfa_action values") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
320 lines
7.8 KiB
C
320 lines
7.8 KiB
C
/*
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* net/sched/act_gact.c Generic actions
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* copyright Jamal Hadi Salim (2002-4)
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*
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_cls.h>
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#include <linux/tc_act/tc_gact.h>
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#include <net/tc_act/tc_gact.h>
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static unsigned int gact_net_id;
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static struct tc_action_ops act_gact_ops;
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#ifdef CONFIG_GACT_PROB
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static int gact_net_rand(struct tcf_gact *gact)
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{
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smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
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if (prandom_u32() % gact->tcfg_pval)
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return gact->tcf_action;
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return gact->tcfg_paction;
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}
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static int gact_determ(struct tcf_gact *gact)
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{
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u32 pack = atomic_inc_return(&gact->packets);
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smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
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if (pack % gact->tcfg_pval)
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return gact->tcf_action;
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return gact->tcfg_paction;
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}
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typedef int (*g_rand)(struct tcf_gact *gact);
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static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ };
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#endif /* CONFIG_GACT_PROB */
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static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
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[TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
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[TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
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};
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static int tcf_gact_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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int ovr, int bind, bool rtnl_held,
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struct tcf_proto *tp, struct netlink_ext_ack *extack)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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struct nlattr *tb[TCA_GACT_MAX + 1];
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struct tcf_chain *goto_ch = NULL;
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struct tc_gact *parm;
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struct tcf_gact *gact;
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int ret = 0;
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int err;
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#ifdef CONFIG_GACT_PROB
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struct tc_gact_p *p_parm = NULL;
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#endif
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if (nla == NULL)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy, NULL);
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if (err < 0)
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return err;
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if (tb[TCA_GACT_PARMS] == NULL)
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return -EINVAL;
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parm = nla_data(tb[TCA_GACT_PARMS]);
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#ifndef CONFIG_GACT_PROB
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if (tb[TCA_GACT_PROB] != NULL)
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return -EOPNOTSUPP;
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#else
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if (tb[TCA_GACT_PROB]) {
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p_parm = nla_data(tb[TCA_GACT_PROB]);
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if (p_parm->ptype >= MAX_RAND)
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return -EINVAL;
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if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) {
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NL_SET_ERR_MSG(extack,
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"goto chain not allowed on fallback");
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return -EINVAL;
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}
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}
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#endif
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err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
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if (!err) {
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_gact_ops, bind, true);
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if (ret) {
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tcf_idr_cleanup(tn, parm->index);
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return ret;
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}
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ret = ACT_P_CREATED;
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} else if (err > 0) {
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if (bind)/* dont override defaults */
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return 0;
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if (!ovr) {
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tcf_idr_release(*a, bind);
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return -EEXIST;
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}
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} else {
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return err;
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}
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err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
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if (err < 0)
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goto release_idr;
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gact = to_gact(*a);
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spin_lock_bh(&gact->tcf_lock);
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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
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#ifdef CONFIG_GACT_PROB
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if (p_parm) {
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gact->tcfg_paction = p_parm->paction;
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gact->tcfg_pval = max_t(u16, 1, p_parm->pval);
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/* Make sure tcfg_pval is written before tcfg_ptype
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* coupled with smp_rmb() in gact_net_rand() & gact_determ()
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*/
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smp_wmb();
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gact->tcfg_ptype = p_parm->ptype;
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}
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#endif
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spin_unlock_bh(&gact->tcf_lock);
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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if (ret == ACT_P_CREATED)
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tcf_idr_insert(tn, *a);
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return ret;
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release_idr:
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tcf_idr_release(*a, bind);
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return err;
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}
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static int tcf_gact_act(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_gact *gact = to_gact(a);
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int action = READ_ONCE(gact->tcf_action);
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#ifdef CONFIG_GACT_PROB
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{
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u32 ptype = READ_ONCE(gact->tcfg_ptype);
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if (ptype)
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action = gact_rand[ptype](gact);
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}
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#endif
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bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb);
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if (action == TC_ACT_SHOT)
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qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats));
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tcf_lastuse_update(&gact->tcf_tm);
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return action;
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}
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static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets,
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u64 lastuse, bool hw)
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{
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struct tcf_gact *gact = to_gact(a);
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int action = READ_ONCE(gact->tcf_action);
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struct tcf_t *tm = &gact->tcf_tm;
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_bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes,
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packets);
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if (action == TC_ACT_SHOT)
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this_cpu_ptr(gact->common.cpu_qstats)->drops += packets;
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if (hw)
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_bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats_hw),
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bytes, packets);
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tm->lastuse = max_t(u64, tm->lastuse, lastuse);
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}
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static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
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int bind, int ref)
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{
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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_gact *gact = to_gact(a);
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struct tc_gact opt = {
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.index = gact->tcf_index,
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.refcnt = refcount_read(&gact->tcf_refcnt) - ref,
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.bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
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};
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struct tcf_t t;
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spin_lock_bh(&gact->tcf_lock);
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opt.action = gact->tcf_action;
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if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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#ifdef CONFIG_GACT_PROB
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if (gact->tcfg_ptype) {
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struct tc_gact_p p_opt = {
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.paction = gact->tcfg_paction,
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.pval = gact->tcfg_pval,
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.ptype = gact->tcfg_ptype,
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};
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if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
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goto nla_put_failure;
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}
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#endif
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tcf_tm_dump(&t, &gact->tcf_tm);
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if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
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goto nla_put_failure;
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spin_unlock_bh(&gact->tcf_lock);
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return skb->len;
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nla_put_failure:
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spin_unlock_bh(&gact->tcf_lock);
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nlmsg_trim(skb, b);
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return -1;
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}
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static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
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struct netlink_callback *cb, int type,
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const struct tc_action_ops *ops,
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struct netlink_ext_ack *extack)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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return tcf_generic_walker(tn, skb, cb, type, ops, extack);
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}
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static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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return tcf_idr_search(tn, a, index);
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}
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static size_t tcf_gact_get_fill_size(const struct tc_action *act)
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{
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size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
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#ifdef CONFIG_GACT_PROB
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if (to_gact(act)->tcfg_ptype)
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/* TCA_GACT_PROB */
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sz += nla_total_size(sizeof(struct tc_gact_p));
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#endif
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return sz;
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}
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static struct tc_action_ops act_gact_ops = {
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.kind = "gact",
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.id = TCA_ID_GACT,
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.owner = THIS_MODULE,
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.act = tcf_gact_act,
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.stats_update = tcf_gact_stats_update,
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.dump = tcf_gact_dump,
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.init = tcf_gact_init,
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.walk = tcf_gact_walker,
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.lookup = tcf_gact_search,
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.get_fill_size = tcf_gact_get_fill_size,
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.size = sizeof(struct tcf_gact),
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};
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static __net_init int gact_init_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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return tc_action_net_init(tn, &act_gact_ops);
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}
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static void __net_exit gact_exit_net(struct list_head *net_list)
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{
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tc_action_net_exit(net_list, gact_net_id);
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}
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static struct pernet_operations gact_net_ops = {
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.init = gact_init_net,
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.exit_batch = gact_exit_net,
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.id = &gact_net_id,
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.size = sizeof(struct tc_action_net),
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};
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MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
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MODULE_DESCRIPTION("Generic Classifier actions");
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MODULE_LICENSE("GPL");
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static int __init gact_init_module(void)
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{
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#ifdef CONFIG_GACT_PROB
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pr_info("GACT probability on\n");
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#else
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pr_info("GACT probability NOT on\n");
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#endif
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return tcf_register_action(&act_gact_ops, &gact_net_ops);
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}
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static void __exit gact_cleanup_module(void)
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{
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tcf_unregister_action(&act_gact_ops, &gact_net_ops);
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}
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module_init(gact_init_module);
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module_exit(gact_cleanup_module);
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