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![Lin Ma](/assets/img/avatar_default.png)
The attribute TCA_PEDIT_PARMS_EX is not be included in pedit_policy and
one malicious user could fake a TCA_PEDIT_PARMS_EX whose length is
smaller than the intended sizeof(struct tc_pedit). Hence, the
dereference in tcf_pedit_init() could access dirty heap data.
static int tcf_pedit_init(...)
{
// ...
pattr = tb[TCA_PEDIT_PARMS]; // TCA_PEDIT_PARMS is included
if (!pattr)
pattr = tb[TCA_PEDIT_PARMS_EX]; // but this is not
// ...
parm = nla_data(pattr);
index = parm->index; // parm is able to be smaller than 4 bytes
// and this dereference gets dirty skb_buff
// data created in netlink_sendmsg
}
This commit adds TCA_PEDIT_PARMS_EX length in pedit_policy which avoid
the above case, just like the TCA_PEDIT_PARMS.
Fixes: 71d0ed7079
("net/act_pedit: Support using offset relative to the conventional network headers")
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>
Link: https://lore.kernel.org/r/20230703110842.590282-1-linma@zju.edu.cn
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
658 lines
16 KiB
C
658 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/act_pedit.c Generic packet editor
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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/ip.h>
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#include <linux/ipv6.h>
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#include <linux/slab.h>
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#include <net/ipv6.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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#include <net/pkt_cls.h>
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#include <net/tc_wrapper.h>
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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_PARMS_EX] = { .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] =
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NLA_POLICY_MAX(NLA_U16, TCA_PEDIT_HDR_TYPE_MAX),
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[TCA_PEDIT_KEY_EX_CMD] = NLA_POLICY_MAX(NLA_U16, TCA_PEDIT_CMD_MAX),
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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, struct netlink_ext_ack *extack)
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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)
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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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NL_SET_ERR_MSG_MOD(extack, "Can't parse more extended keys than requested");
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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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NL_SET_ERR_MSG_ATTR(extack, ka, "Unknown attribute, expected extended key");
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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_deprecated(tb, TCA_PEDIT_KEY_EX_MAX,
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ka, pedit_key_ex_policy,
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NULL);
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if (err)
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goto err_out;
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if (NL_REQ_ATTR_CHECK(extack, nla, tb, TCA_PEDIT_KEY_EX_HTYPE)) {
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NL_SET_ERR_MSG(extack, "Missing required attribute");
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err = -EINVAL;
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goto err_out;
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}
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if (NL_REQ_ATTR_CHECK(extack, nla, tb, TCA_PEDIT_KEY_EX_CMD)) {
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NL_SET_ERR_MSG(extack, "Missing required attribute");
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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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k++;
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}
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if (n) {
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NL_SET_ERR_MSG_MOD(extack, "Not enough extended keys to parse");
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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_noflag(skb,
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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_noflag(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 void tcf_pedit_cleanup_rcu(struct rcu_head *head)
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{
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struct tcf_pedit_parms *parms =
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container_of(head, struct tcf_pedit_parms, rcu);
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kfree(parms->tcfp_keys_ex);
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kfree(parms->tcfp_keys);
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kfree(parms);
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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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struct tcf_proto *tp, u32 flags,
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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, act_pedit_ops.net_id);
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bool bind = flags & TCA_ACT_FLAGS_BIND;
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struct tcf_chain *goto_ch = NULL;
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struct tcf_pedit_parms *oparms, *nparms;
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struct nlattr *tb[TCA_PEDIT_MAX + 1];
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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 i, ksize;
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u32 index;
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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_deprecated(tb, TCA_PEDIT_MAX, nla,
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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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index = parm->index;
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err = tcf_idr_check_alloc(tn, &index, a, bind);
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if (!err) {
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ret = tcf_idr_create_from_flags(tn, index, est, a,
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&act_pedit_ops, bind, flags);
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if (ret) {
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tcf_idr_cleanup(tn, 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)
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return 0;
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if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
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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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if (!parm->nkeys) {
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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_release;
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}
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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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ret = -EINVAL;
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goto out_release;
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}
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nparms = kzalloc(sizeof(*nparms), GFP_KERNEL);
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if (!nparms) {
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ret = -ENOMEM;
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goto out_release;
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}
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nparms->tcfp_keys_ex =
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tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys, extack);
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if (IS_ERR(nparms->tcfp_keys_ex)) {
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ret = PTR_ERR(nparms->tcfp_keys_ex);
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goto out_free;
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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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ret = err;
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goto out_free_ex;
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}
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nparms->tcfp_off_max_hint = 0;
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nparms->tcfp_flags = parm->flags;
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nparms->tcfp_nkeys = parm->nkeys;
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nparms->tcfp_keys = kmemdup(parm->keys, ksize, GFP_KERNEL);
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if (!nparms->tcfp_keys) {
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ret = -ENOMEM;
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goto put_chain;
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}
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for (i = 0; i < nparms->tcfp_nkeys; ++i) {
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u32 offmask = nparms->tcfp_keys[i].offmask;
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u32 cur = nparms->tcfp_keys[i].off;
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/* The AT option can be added to static offsets in the datapath */
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if (!offmask && cur % 4) {
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NL_SET_ERR_MSG_MOD(extack, "Offsets must be on 32bit boundaries");
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ret = -EINVAL;
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goto out_free_keys;
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}
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/* sanitize the shift value for any later use */
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nparms->tcfp_keys[i].shift = min_t(size_t,
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BITS_PER_TYPE(int) - 1,
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nparms->tcfp_keys[i].shift);
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/* The AT option can read a single byte, we can bound the actual
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* value with uchar max.
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*/
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cur += (0xff & offmask) >> nparms->tcfp_keys[i].shift;
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/* Each key touches 4 bytes starting from the computed offset */
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nparms->tcfp_off_max_hint =
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max(nparms->tcfp_off_max_hint, cur + 4);
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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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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
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oparms = rcu_replace_pointer(p->parms, nparms, 1);
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spin_unlock_bh(&p->tcf_lock);
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if (oparms)
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call_rcu(&oparms->rcu, tcf_pedit_cleanup_rcu);
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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return ret;
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out_free_keys:
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kfree(nparms->tcfp_keys);
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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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out_free_ex:
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kfree(nparms->tcfp_keys_ex);
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out_free:
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kfree(nparms);
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out_release:
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tcf_idr_release(*a, bind);
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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 tcf_pedit_parms *parms;
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parms = rcu_dereference_protected(p->parms, 1);
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if (parms)
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call_rcu(&parms->rcu, tcf_pedit_cleanup_rcu);
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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_l4_skb_offset(struct sk_buff *skb, int *hoffset, const int header_type)
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{
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const int noff = skb_network_offset(skb);
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int ret = -EINVAL;
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struct iphdr _iph;
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switch (skb->protocol) {
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case htons(ETH_P_IP): {
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const struct iphdr *iph = skb_header_pointer(skb, noff, sizeof(_iph), &_iph);
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if (!iph)
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goto out;
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*hoffset = noff + iph->ihl * 4;
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ret = 0;
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break;
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}
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case htons(ETH_P_IPV6):
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ret = ipv6_find_hdr(skb, hoffset, header_type, NULL, NULL) == header_type ? 0 : -EINVAL;
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break;
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}
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out:
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return ret;
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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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/* 'htype' is validated in the netlink parsing */
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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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ret = pedit_l4_skb_offset(skb, hoffset, IPPROTO_TCP);
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break;
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case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
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ret = pedit_l4_skb_offset(skb, hoffset, IPPROTO_UDP);
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break;
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default:
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break;
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}
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return ret;
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}
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TC_INDIRECT_SCOPE int tcf_pedit_act(struct sk_buff *skb,
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const struct tc_action *a,
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struct tcf_result *res)
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{
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enum pedit_header_type htype = 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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struct tcf_pedit *p = to_pedit(a);
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struct tcf_pedit_key_ex *tkey_ex;
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struct tcf_pedit_parms *parms;
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struct tc_pedit_key *tkey;
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u32 max_offset;
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int i;
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parms = rcu_dereference_bh(p->parms);
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max_offset = (skb_transport_header_was_set(skb) ?
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skb_transport_offset(skb) :
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skb_network_offset(skb)) +
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parms->tcfp_off_max_hint;
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if (skb_ensure_writable(skb, min(skb->len, max_offset)))
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goto done;
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tcf_lastuse_update(&p->tcf_tm);
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tcf_action_update_bstats(&p->common, skb);
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tkey = parms->tcfp_keys;
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tkey_ex = parms->tcfp_keys_ex;
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for (i = parms->tcfp_nkeys; i > 0; i--, tkey++) {
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int offset = tkey->off;
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int hoffset = 0;
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u32 *ptr, hdata;
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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_ratelimited("tc action pedit unable to extract header offset for header type (0x%x)\n", 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_ratelimited("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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if (offset % 4) {
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pr_info_ratelimited("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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}
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if (!offset_valid(skb, hoffset + offset)) {
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pr_info_ratelimited("tc action pedit offset %d out of bounds\n", 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 */
|
|
switch (cmd) {
|
|
case TCA_PEDIT_KEY_EX_CMD_SET:
|
|
val = tkey->val;
|
|
break;
|
|
case TCA_PEDIT_KEY_EX_CMD_ADD:
|
|
val = (*ptr + tkey->val) & ~tkey->mask;
|
|
break;
|
|
default:
|
|
pr_info_ratelimited("tc action pedit bad command (%d)\n", cmd);
|
|
goto bad;
|
|
}
|
|
|
|
*ptr = ((*ptr & tkey->mask) ^ val);
|
|
if (ptr == &hdata)
|
|
skb_store_bits(skb, hoffset + offset, ptr, 4);
|
|
}
|
|
|
|
goto done;
|
|
|
|
bad:
|
|
tcf_action_inc_overlimit_qstats(&p->common);
|
|
done:
|
|
return p->tcf_action;
|
|
}
|
|
|
|
static void tcf_pedit_stats_update(struct tc_action *a, u64 bytes, u64 packets,
|
|
u64 drops, u64 lastuse, bool hw)
|
|
{
|
|
struct tcf_pedit *d = to_pedit(a);
|
|
struct tcf_t *tm = &d->tcf_tm;
|
|
|
|
tcf_action_update_stats(a, bytes, packets, drops, hw);
|
|
tm->lastuse = max_t(u64, tm->lastuse, lastuse);
|
|
}
|
|
|
|
static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
|
|
int bind, int ref)
|
|
{
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct tcf_pedit *p = to_pedit(a);
|
|
struct tcf_pedit_parms *parms;
|
|
struct tc_pedit *opt;
|
|
struct tcf_t t;
|
|
int s;
|
|
|
|
spin_lock_bh(&p->tcf_lock);
|
|
parms = rcu_dereference_protected(p->parms, 1);
|
|
s = struct_size(opt, keys, parms->tcfp_nkeys);
|
|
|
|
opt = kzalloc(s, GFP_ATOMIC);
|
|
if (unlikely(!opt)) {
|
|
spin_unlock_bh(&p->tcf_lock);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
memcpy(opt->keys, parms->tcfp_keys,
|
|
flex_array_size(opt, keys, parms->tcfp_nkeys));
|
|
opt->index = p->tcf_index;
|
|
opt->nkeys = parms->tcfp_nkeys;
|
|
opt->flags = parms->tcfp_flags;
|
|
opt->action = p->tcf_action;
|
|
opt->refcnt = refcount_read(&p->tcf_refcnt) - ref;
|
|
opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;
|
|
|
|
if (parms->tcfp_keys_ex) {
|
|
if (tcf_pedit_key_ex_dump(skb, parms->tcfp_keys_ex,
|
|
parms->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_offload_act_setup(struct tc_action *act, void *entry_data,
|
|
u32 *index_inc, bool bind,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (bind) {
|
|
struct flow_action_entry *entry = entry_data;
|
|
int k;
|
|
|
|
for (k = 0; k < tcf_pedit_nkeys(act); k++) {
|
|
switch (tcf_pedit_cmd(act, k)) {
|
|
case TCA_PEDIT_KEY_EX_CMD_SET:
|
|
entry->id = FLOW_ACTION_MANGLE;
|
|
break;
|
|
case TCA_PEDIT_KEY_EX_CMD_ADD:
|
|
entry->id = FLOW_ACTION_ADD;
|
|
break;
|
|
default:
|
|
NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
entry->mangle.htype = tcf_pedit_htype(act, k);
|
|
entry->mangle.mask = tcf_pedit_mask(act, k);
|
|
entry->mangle.val = tcf_pedit_val(act, k);
|
|
entry->mangle.offset = tcf_pedit_offset(act, k);
|
|
entry->hw_stats = tc_act_hw_stats(act->hw_stats);
|
|
entry++;
|
|
}
|
|
*index_inc = k;
|
|
} else {
|
|
struct flow_offload_action *fl_action = entry_data;
|
|
u32 cmd = tcf_pedit_cmd(act, 0);
|
|
int k;
|
|
|
|
switch (cmd) {
|
|
case TCA_PEDIT_KEY_EX_CMD_SET:
|
|
fl_action->id = FLOW_ACTION_MANGLE;
|
|
break;
|
|
case TCA_PEDIT_KEY_EX_CMD_ADD:
|
|
fl_action->id = FLOW_ACTION_ADD;
|
|
break;
|
|
default:
|
|
NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
for (k = 1; k < tcf_pedit_nkeys(act); k++) {
|
|
if (cmd != tcf_pedit_cmd(act, k)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct tc_action_ops act_pedit_ops = {
|
|
.kind = "pedit",
|
|
.id = TCA_ID_PEDIT,
|
|
.owner = THIS_MODULE,
|
|
.act = tcf_pedit_act,
|
|
.stats_update = tcf_pedit_stats_update,
|
|
.dump = tcf_pedit_dump,
|
|
.cleanup = tcf_pedit_cleanup,
|
|
.init = tcf_pedit_init,
|
|
.offload_act_setup = tcf_pedit_offload_act_setup,
|
|
.size = sizeof(struct tcf_pedit),
|
|
};
|
|
|
|
static __net_init int pedit_init_net(struct net *net)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, act_pedit_ops.net_id);
|
|
|
|
return tc_action_net_init(net, tn, &act_pedit_ops);
|
|
}
|
|
|
|
static void __net_exit pedit_exit_net(struct list_head *net_list)
|
|
{
|
|
tc_action_net_exit(net_list, act_pedit_ops.net_id);
|
|
}
|
|
|
|
static struct pernet_operations pedit_net_ops = {
|
|
.init = pedit_init_net,
|
|
.exit_batch = pedit_exit_net,
|
|
.id = &act_pedit_ops.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);
|