![Davide Caratti](/assets/img/avatar_default.png)
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: 71d0ed7079
("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>
519 lines
12 KiB
C
519 lines
12 KiB
C
/*
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* net/sched/act_pedit.c Generic packet editor
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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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* Authors: Jamal Hadi Salim (2002-4)
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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 <linux/slab.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_pedit.h>
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#include <net/tc_act/tc_pedit.h>
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#include <uapi/linux/tc_act/tc_pedit.h>
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static unsigned int pedit_net_id;
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static struct tc_action_ops act_pedit_ops;
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static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
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[TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
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[TCA_PEDIT_KEYS_EX] = { .type = NLA_NESTED },
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};
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static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
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[TCA_PEDIT_KEY_EX_HTYPE] = { .type = NLA_U16 },
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[TCA_PEDIT_KEY_EX_CMD] = { .type = NLA_U16 },
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};
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static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
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u8 n)
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{
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struct tcf_pedit_key_ex *keys_ex;
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struct tcf_pedit_key_ex *k;
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const struct nlattr *ka;
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int err = -EINVAL;
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int rem;
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if (!nla || !n)
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return NULL;
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keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
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if (!keys_ex)
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return ERR_PTR(-ENOMEM);
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k = keys_ex;
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nla_for_each_nested(ka, nla, rem) {
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struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
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if (!n) {
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err = -EINVAL;
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goto err_out;
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}
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n--;
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if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
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err = -EINVAL;
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goto err_out;
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}
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err = nla_parse_nested(tb, TCA_PEDIT_KEY_EX_MAX, ka,
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pedit_key_ex_policy, NULL);
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if (err)
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goto err_out;
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if (!tb[TCA_PEDIT_KEY_EX_HTYPE] ||
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!tb[TCA_PEDIT_KEY_EX_CMD]) {
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err = -EINVAL;
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goto err_out;
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}
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k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
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k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
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if (k->htype > TCA_PEDIT_HDR_TYPE_MAX ||
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k->cmd > TCA_PEDIT_CMD_MAX) {
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err = -EINVAL;
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goto err_out;
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}
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k++;
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}
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if (n) {
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err = -EINVAL;
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goto err_out;
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}
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return keys_ex;
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err_out:
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kfree(keys_ex);
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return ERR_PTR(err);
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}
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static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
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struct tcf_pedit_key_ex *keys_ex, int n)
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{
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struct nlattr *keys_start = nla_nest_start(skb, TCA_PEDIT_KEYS_EX);
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if (!keys_start)
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goto nla_failure;
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for (; n > 0; n--) {
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struct nlattr *key_start;
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key_start = nla_nest_start(skb, TCA_PEDIT_KEY_EX);
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if (!key_start)
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goto nla_failure;
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if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) ||
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nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
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goto nla_failure;
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nla_nest_end(skb, key_start);
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keys_ex++;
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}
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nla_nest_end(skb, keys_start);
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return 0;
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nla_failure:
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nla_nest_cancel(skb, keys_start);
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return -EINVAL;
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}
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static int tcf_pedit_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 netlink_ext_ack *extack)
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{
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struct tc_action_net *tn = net_generic(net, pedit_net_id);
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struct nlattr *tb[TCA_PEDIT_MAX + 1];
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struct tc_pedit_key *keys = NULL;
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struct tcf_pedit_key_ex *keys_ex;
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struct tc_pedit *parm;
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struct nlattr *pattr;
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struct tcf_pedit *p;
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int ret = 0, err;
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int ksize;
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if (!nla) {
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NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
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return -EINVAL;
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}
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err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy, NULL);
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if (err < 0)
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return err;
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pattr = tb[TCA_PEDIT_PARMS];
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if (!pattr)
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pattr = tb[TCA_PEDIT_PARMS_EX];
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if (!pattr) {
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NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
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return -EINVAL;
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}
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parm = nla_data(pattr);
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ksize = parm->nkeys * sizeof(struct tc_pedit_key);
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if (nla_len(pattr) < sizeof(*parm) + ksize) {
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NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
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return -EINVAL;
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}
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keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
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if (IS_ERR(keys_ex))
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return PTR_ERR(keys_ex);
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err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
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if (!err) {
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if (!parm->nkeys) {
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tcf_idr_cleanup(tn, parm->index);
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NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
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ret = -EINVAL;
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goto out_free;
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}
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_pedit_ops, bind, false);
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if (ret) {
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tcf_idr_cleanup(tn, parm->index);
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goto out_free;
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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)
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goto out_free;
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if (!ovr) {
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ret = -EEXIST;
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goto out_release;
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}
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} else {
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return err;
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}
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p = to_pedit(*a);
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spin_lock_bh(&p->tcf_lock);
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if (ret == ACT_P_CREATED ||
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(p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys)) {
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keys = kmalloc(ksize, GFP_ATOMIC);
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if (!keys) {
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spin_unlock_bh(&p->tcf_lock);
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ret = -ENOMEM;
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goto out_release;
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}
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kfree(p->tcfp_keys);
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p->tcfp_keys = keys;
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p->tcfp_nkeys = parm->nkeys;
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}
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memcpy(p->tcfp_keys, parm->keys, ksize);
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p->tcfp_flags = parm->flags;
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p->tcf_action = parm->action;
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kfree(p->tcfp_keys_ex);
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p->tcfp_keys_ex = keys_ex;
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spin_unlock_bh(&p->tcf_lock);
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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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out_release:
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tcf_idr_release(*a, bind);
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out_free:
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kfree(keys_ex);
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return ret;
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}
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static void tcf_pedit_cleanup(struct tc_action *a)
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{
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struct tcf_pedit *p = to_pedit(a);
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struct tc_pedit_key *keys = p->tcfp_keys;
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kfree(keys);
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kfree(p->tcfp_keys_ex);
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}
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static bool offset_valid(struct sk_buff *skb, int offset)
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{
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if (offset > 0 && offset > skb->len)
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return false;
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if (offset < 0 && -offset > skb_headroom(skb))
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return false;
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return true;
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}
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static int pedit_skb_hdr_offset(struct sk_buff *skb,
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enum pedit_header_type htype, int *hoffset)
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{
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int ret = -EINVAL;
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switch (htype) {
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case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
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if (skb_mac_header_was_set(skb)) {
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*hoffset = skb_mac_offset(skb);
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ret = 0;
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}
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break;
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case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
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case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
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case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
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*hoffset = skb_network_offset(skb);
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ret = 0;
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break;
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case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
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case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
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if (skb_transport_header_was_set(skb)) {
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*hoffset = skb_transport_offset(skb);
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ret = 0;
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}
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static int tcf_pedit_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_pedit *p = to_pedit(a);
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int i;
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if (skb_unclone(skb, GFP_ATOMIC))
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return p->tcf_action;
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spin_lock(&p->tcf_lock);
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tcf_lastuse_update(&p->tcf_tm);
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if (p->tcfp_nkeys > 0) {
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struct tc_pedit_key *tkey = p->tcfp_keys;
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struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex;
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enum pedit_header_type htype =
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TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
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enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
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for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
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u32 *ptr, hdata;
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int offset = tkey->off;
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int hoffset;
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u32 val;
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int rc;
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if (tkey_ex) {
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htype = tkey_ex->htype;
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cmd = tkey_ex->cmd;
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tkey_ex++;
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}
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rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
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if (rc) {
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pr_info("tc action pedit bad header type specified (0x%x)\n",
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htype);
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goto bad;
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}
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if (tkey->offmask) {
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u8 *d, _d;
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if (!offset_valid(skb, hoffset + tkey->at)) {
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pr_info("tc action pedit 'at' offset %d out of bounds\n",
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hoffset + tkey->at);
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goto bad;
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}
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d = skb_header_pointer(skb, hoffset + tkey->at,
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sizeof(_d), &_d);
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if (!d)
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goto bad;
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offset += (*d & tkey->offmask) >> tkey->shift;
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}
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if (offset % 4) {
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pr_info("tc action pedit offset must be on 32 bit boundaries\n");
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goto bad;
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}
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if (!offset_valid(skb, hoffset + offset)) {
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pr_info("tc action pedit offset %d out of bounds\n",
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hoffset + offset);
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goto bad;
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}
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ptr = skb_header_pointer(skb, hoffset + offset,
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sizeof(hdata), &hdata);
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if (!ptr)
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goto bad;
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/* just do it, baby */
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switch (cmd) {
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case TCA_PEDIT_KEY_EX_CMD_SET:
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val = tkey->val;
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break;
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case TCA_PEDIT_KEY_EX_CMD_ADD:
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val = (*ptr + tkey->val) & ~tkey->mask;
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break;
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default:
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pr_info("tc action pedit bad command (%d)\n",
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cmd);
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goto bad;
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}
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*ptr = ((*ptr & tkey->mask) ^ val);
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if (ptr == &hdata)
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skb_store_bits(skb, hoffset + offset, ptr, 4);
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}
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goto done;
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} else {
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WARN(1, "pedit BUG: index %d\n", p->tcf_index);
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}
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bad:
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p->tcf_qstats.overlimits++;
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done:
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bstats_update(&p->tcf_bstats, skb);
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spin_unlock(&p->tcf_lock);
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return p->tcf_action;
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}
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static int tcf_pedit_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_pedit *p = to_pedit(a);
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struct tc_pedit *opt;
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struct tcf_t t;
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int s;
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s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key);
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/* netlink spinlocks held above us - must use ATOMIC */
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|
opt = kzalloc(s, GFP_ATOMIC);
|
|
if (unlikely(!opt))
|
|
return -ENOBUFS;
|
|
|
|
spin_lock_bh(&p->tcf_lock);
|
|
memcpy(opt->keys, p->tcfp_keys,
|
|
p->tcfp_nkeys * sizeof(struct tc_pedit_key));
|
|
opt->index = p->tcf_index;
|
|
opt->nkeys = p->tcfp_nkeys;
|
|
opt->flags = p->tcfp_flags;
|
|
opt->action = p->tcf_action;
|
|
opt->refcnt = refcount_read(&p->tcf_refcnt) - ref;
|
|
opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;
|
|
|
|
if (p->tcfp_keys_ex) {
|
|
if (tcf_pedit_key_ex_dump(skb,
|
|
p->tcfp_keys_ex,
|
|
p->tcfp_nkeys))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
|
|
goto nla_put_failure;
|
|
} else {
|
|
if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
tcf_tm_dump(&t, &p->tcf_tm);
|
|
if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
|
|
goto nla_put_failure;
|
|
spin_unlock_bh(&p->tcf_lock);
|
|
|
|
kfree(opt);
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
spin_unlock_bh(&p->tcf_lock);
|
|
nlmsg_trim(skb, b);
|
|
kfree(opt);
|
|
return -1;
|
|
}
|
|
|
|
static int tcf_pedit_walker(struct net *net, struct sk_buff *skb,
|
|
struct netlink_callback *cb, int type,
|
|
const struct tc_action_ops *ops,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, pedit_net_id);
|
|
|
|
return tcf_generic_walker(tn, skb, cb, type, ops, extack);
|
|
}
|
|
|
|
static int tcf_pedit_search(struct net *net, struct tc_action **a, u32 index,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, pedit_net_id);
|
|
|
|
return tcf_idr_search(tn, a, index);
|
|
}
|
|
|
|
static struct tc_action_ops act_pedit_ops = {
|
|
.kind = "pedit",
|
|
.type = TCA_ACT_PEDIT,
|
|
.owner = THIS_MODULE,
|
|
.act = tcf_pedit_act,
|
|
.dump = tcf_pedit_dump,
|
|
.cleanup = tcf_pedit_cleanup,
|
|
.init = tcf_pedit_init,
|
|
.walk = tcf_pedit_walker,
|
|
.lookup = tcf_pedit_search,
|
|
.size = sizeof(struct tcf_pedit),
|
|
};
|
|
|
|
static __net_init int pedit_init_net(struct net *net)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, pedit_net_id);
|
|
|
|
return tc_action_net_init(tn, &act_pedit_ops);
|
|
}
|
|
|
|
static void __net_exit pedit_exit_net(struct list_head *net_list)
|
|
{
|
|
tc_action_net_exit(net_list, pedit_net_id);
|
|
}
|
|
|
|
static struct pernet_operations pedit_net_ops = {
|
|
.init = pedit_init_net,
|
|
.exit_batch = pedit_exit_net,
|
|
.id = &pedit_net_id,
|
|
.size = sizeof(struct tc_action_net),
|
|
};
|
|
|
|
MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
|
|
MODULE_DESCRIPTION("Generic Packet Editor actions");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init pedit_init_module(void)
|
|
{
|
|
return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
|
|
}
|
|
|
|
static void __exit pedit_cleanup_module(void)
|
|
{
|
|
tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
|
|
}
|
|
|
|
module_init(pedit_init_module);
|
|
module_exit(pedit_cleanup_module);
|