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net/sched: act_bpf: validate the control action inside init()
the following script:
# tc filter add dev crash0 egress matchall \
> action bpf bytecode '1,6 0 0 4294967295' pass index 90
# tc actions replace action bpf \
> bytecode '1,6 0 0 4294967295' goto chain 42 index 90 cookie c1a0c1a0
# tc action show action bpf
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: bpf bytecode '1,6 0 0 4294967295' default-action goto chain 42
index 90 ref 2 bind 1
cookie c1a0c1a0
Then, the first packet transmitted by crash0 made the kernel crash:
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:ffffb3a0803dfa90 EFLAGS: 00010246
RAX: 000000002000002a RBX: ffff942b347ada00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffb3a08034d038 RDI: ffff942b347ada00
RBP: ffffb3a0803dfb30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffb3a0803dfb0c R12: ffff942b3b682b00
R13: ffff942b3b682b08 R14: 0000000000000001 R15: ffff942b3b682f00
FS: 00007f6160a72740(0000) GS:ffff942b3da80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000795a4002 CR4: 00000000001606e0
Call Trace:
tcf_classify+0x58/0x120
__dev_queue_xmit+0x40a/0x890
? ip_finish_output2+0x16f/0x430
ip_finish_output2+0x16f/0x430
? ip_output+0x69/0xe0
ip_output+0x69/0xe0
? ip_forward_options+0x1a0/0x1a0
ip_send_skb+0x15/0x40
raw_sendmsg+0x8e1/0xbd0
? sched_clock+0x5/0x10
? sched_clock_cpu+0xc/0xa0
? try_to_wake_up+0x54/0x480
? ldsem_down_read+0x3f/0x280
? _cond_resched+0x15/0x40
? down_read+0xe/0x30
? copy_termios+0x1e/0x70
? tty_mode_ioctl+0x1b6/0x4c0
? sock_sendmsg+0x36/0x40
sock_sendmsg+0x36/0x40
__sys_sendto+0x10e/0x140
? do_vfs_ioctl+0xa4/0x640
? handle_mm_fault+0xdc/0x210
? syscall_trace_enter+0x1df/0x2e0
? __audit_syscall_exit+0x216/0x260
__x64_sys_sendto+0x24/0x30
do_syscall_64+0x5b/0x180
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f615f7e3c03
Code: 48 8b 0d 90 62 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 9d c3 2c 00 00 75 13 49 89 ca b8 2c 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 4b cc 00 00 48 89 04 24
RSP: 002b:00007ffee5d8cc28 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055a4f28f1700 RCX: 00007f615f7e3c03
RDX: 0000000000000040 RSI: 000055a4f28f1700 RDI: 0000000000000003
RBP: 00007ffee5d8e340 R08: 000055a4f28ee510 R09: 0000000000000010
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000040
R13: 000055a4f28f16c0 R14: 000055a4f28ef69c R15: 0000000000000080
Modules linked in: act_bpf veth ip6table_filter ip6_tables iptable_filter binfmt_misc ext4 mbcache crct10dif_pclmul jbd2 crc32_pclmul snd_hda_codec_generic ghash_clmulni_intel snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core snd_seq snd_seq_device snd_pcm aesni_intel crypto_simd cryptd glue_helper pcspkr joydev virtio_balloon 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 virtio_blk virtio_net virtio_console net_failover failover syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm crc32c_intel ata_piix serio_raw libata virtio_pci virtio_ring virtio floppy dm_mirror dm_region_hash dm_log dm_mod
CR2: 0000000000000000
Validating the control action within tcf_bpf_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
85d0966fa5
commit
4e1810049c
@ -17,6 +17,7 @@
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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_bpf.h>
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#include <net/tc_act/tc_bpf.h>
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@ -282,6 +283,7 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
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{
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struct tc_action_net *tn = net_generic(net, bpf_net_id);
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struct nlattr *tb[TCA_ACT_BPF_MAX + 1];
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struct tcf_chain *goto_ch = NULL;
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struct tcf_bpf_cfg cfg, old;
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struct tc_act_bpf *parm;
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struct tcf_bpf *prog;
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@ -323,12 +325,16 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
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return ret;
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}
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ret = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
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if (ret < 0)
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goto release_idr;
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is_bpf = tb[TCA_ACT_BPF_OPS_LEN] && tb[TCA_ACT_BPF_OPS];
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is_ebpf = tb[TCA_ACT_BPF_FD];
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if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) {
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ret = -EINVAL;
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goto out;
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goto put_chain;
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}
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memset(&cfg, 0, sizeof(cfg));
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@ -336,7 +342,7 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
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ret = is_bpf ? tcf_bpf_init_from_ops(tb, &cfg) :
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tcf_bpf_init_from_efd(tb, &cfg);
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if (ret < 0)
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goto out;
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goto put_chain;
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prog = to_bpf(*act);
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@ -350,10 +356,13 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
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if (cfg.bpf_num_ops)
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prog->bpf_num_ops = cfg.bpf_num_ops;
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prog->tcf_action = parm->action;
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goto_ch = tcf_action_set_ctrlact(*act, parm->action, goto_ch);
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rcu_assign_pointer(prog->filter, cfg.filter);
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spin_unlock_bh(&prog->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 (res == ACT_P_CREATED) {
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tcf_idr_insert(tn, *act);
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} else {
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@ -363,9 +372,13 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
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}
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return res;
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out:
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tcf_idr_release(*act, bind);
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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(*act, bind);
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return ret;
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}
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@ -286,5 +286,30 @@
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"teardown": [
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"$TC action flush action bpf"
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]
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},
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{
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"id": "b8a1",
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"name": "Replace bpf action with invalid goto_chain control",
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"category": [
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"actions",
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"bpf"
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],
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"setup": [
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[
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"$TC actions flush action bpf",
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0,
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1,
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255
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],
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"$TC action add action bpf bytecode '1,6 0 0 4294967295' pass index 90"
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],
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"cmdUnderTest": "$TC action replace action bpf bytecode '1,6 0 0 4294967295' goto chain 42 index 90 cookie c1a0c1a0",
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"expExitCode": "255",
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"verifyCmd": "$TC action list action bpf",
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"matchPattern": "action order [0-9]*: bpf.* default-action pass.*index 90",
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"matchCount": "1",
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"teardown": [
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"$TC action flush action bpf"
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]
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}
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]
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