net/sched: act_csum: validate the control action inside init()
the following script:
# tc qdisc add dev crash0 clsact
# tc filter add dev crash0 egress matchall action csum icmp pass index 90
# tc actions replace action csum icmp goto chain 42 index 90 \
> cookie c1a0c1a0
# tc actions show action csum
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: csum (icmp) action goto chain 42
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 8000000074692067 P4D 8000000074692067 PUD 2e210067 PMD 0
Oops: 0000 [#1] SMP PTI
CPU: 0 PID: 0 Comm: swapper/0 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:ffff93153da03be0 EFLAGS: 00010246
RAX: 000000002000002a RBX: ffff9314ee40f700 RCX: 0000000000003a00
RDX: 0000000000000000 RSI: ffff931537c87828 RDI: ffff931537c87818
RBP: ffff93153da03c80 R08: 00000000527cffff R09: 0000000000000003
R10: 000000000000003f R11: 0000000000000028 R12: ffff9314edf68400
R13: ffff9314edf68408 R14: 0000000000000001 R15: ffff9314ed67b600
FS: 0000000000000000(0000) GS:ffff93153da00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000073e32003 CR4: 00000000001606f0
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: 66 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:ffffffff9a803e98 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff99e184f0 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000087 RDI: 0000000000000000
RBP: 0000000000000000 R08: 000eb5c4572376b3 R09: 0000000000000000
R10: ffffa53e806a3ca0 R11: 00000000000f4240 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_kernel+0x49e/0x4be
secondary_startup_64+0xa4/0xb0
Modules linked in: act_csum veth ip6table_filter ip6_tables iptable_filter binfmt_misc ext4 crct10dif_pclmul crc32_pclmul snd_hda_codec_generic ghash_clmulni_intel snd_hda_intel mbcache snd_hda_codec jbd2 snd_hwdep snd_hda_core snd_seq snd_seq_device snd_pcm aesni_intel crypto_simd cryptd snd_timer glue_helper snd joydev virtio_balloon pcspkr soundcore i2c_piix4 nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs ata_generic pata_acpi qxl drm_kms_helper syscopyarea sysfillrect virtio_net sysimgblt net_failover fb_sys_fops virtio_console virtio_blk ttm failover drm ata_piix crc32c_intel floppy virtio_pci serio_raw libata virtio_ring virtio dm_mirror dm_region_hash dm_log dm_mod
CR2: 0000000000000000
Validating the control action within tcf_csum_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>
This commit is contained in:
Davide Caratti
David S. Miller
parent
4e1810049c
commit
f5c29d8386
@ -33,6 +33,7 @@
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#include <net/sctp/checksum.h>
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#include <net/act_api.h>
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#include <net/pkt_cls.h>
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#include <linux/tc_act/tc_csum.h>
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#include <net/tc_act/tc_csum.h>
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@ -52,6 +53,7 @@ static int tcf_csum_init(struct net *net, struct nlattr *nla,
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struct tc_action_net *tn = net_generic(net, csum_net_id);
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struct tcf_csum_params *params_new;
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struct nlattr *tb[TCA_CSUM_MAX + 1];
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struct tcf_chain *goto_ch = NULL;
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struct tc_csum *parm;
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struct tcf_csum *p;
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int ret = 0, err;
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@ -87,21 +89,27 @@ static int tcf_csum_init(struct net *net, struct nlattr *nla,
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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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p = to_tcf_csum(*a);
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params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
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if (unlikely(!params_new)) {
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tcf_idr_release(*a, bind);
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return -ENOMEM;
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err = -ENOMEM;
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goto put_chain;
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}
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params_new->update_flags = parm->update_flags;
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spin_lock_bh(&p->tcf_lock);
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p->tcf_action = parm->action;
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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
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rcu_swap_protected(p->params, params_new,
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lockdep_is_held(&p->tcf_lock));
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spin_unlock_bh(&p->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 (params_new)
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kfree_rcu(params_new, rcu);
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@ -109,6 +117,12 @@ static int tcf_csum_init(struct net *net, struct nlattr *nla,
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tcf_idr_insert(tn, *a);
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return ret;
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put_chain:
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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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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/**
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@ -500,5 +500,30 @@
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"matchPattern": "^[ \t]+index [0-9]+ ref",
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"matchCount": "0",
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"teardown": []
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},
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{
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"id": "d128",
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"name": "Replace csum action with invalid goto chain control",
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"category": [
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"actions",
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"csum"
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],
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"setup": [
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[
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"$TC actions flush action csum",
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0,
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1,
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255
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],
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"$TC actions add action csum iph index 90"
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],
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"cmdUnderTest": "$TC actions replace action csum iph goto chain 42 index 90 cookie c1a0c1a0",
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"expExitCode": "255",
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"verifyCmd": "$TC actions get action csum index 90",
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"matchPattern": "action order [0-9]*: csum \\(iph\\) action pass.*index 90 ref",
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"matchCount": "1",
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"teardown": [
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"$TC actions flush action csum"
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]
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}
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]
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