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netfilter: conntrack: Fix data-races around ct mark 

nf_conn:mark can be read from and written to in parallel. Use
READ_ONCE()/WRITE_ONCE() for reads and writes to prevent unwanted
compiler optimizations.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Daniel Xu 2022-11-09 12:39:07 -07:00 committed by Pablo Neira Ayuso
parent 40b9d1ab63
commit 52d1aa8b82
11 changed files with 45 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/core/flow_dissector.c
View File

@ -296,7 +296,7 @@ skb_flow_dissect_ct(const struct sk_buff *skb,
key->ct_zone = ct->zone.id;
#endif
#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
key->ct_mark = ct->mark;
key->ct_mark = READ_ONCE(ct->mark);
#endif
cl = nf_ct_labels_find(ct);

4
net/ipv4/netfilter/ipt_CLUSTERIP.c
View File

@ -435,7 +435,7 @@ clusterip_tg(struct sk_buff *skb, const struct xt_action_param *par)
switch (ctinfo) {
case IP_CT_NEW:
ct->mark = hash;
WRITE_ONCE(ct->mark, hash);
break;
case IP_CT_RELATED:
case IP_CT_RELATED_REPLY:
@ -452,7 +452,7 @@ clusterip_tg(struct sk_buff *skb, const struct xt_action_param *par)
#ifdef DEBUG
nf_ct_dump_tuple_ip(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
#endif
pr_debug("hash=%u ct_hash=%u ", hash, ct->mark);
pr_debug("hash=%u ct_hash=%u ", hash, READ_ONCE(ct->mark));
if (!clusterip_responsible(cipinfo->config, hash)) {
pr_debug("not responsible\n");
return NF_DROP;

2
net/netfilter/nf_conntrack_core.c
View File

@ -1781,7 +1781,7 @@ init_conntrack(struct net *net, struct nf_conn *tmpl,
}
#ifdef CONFIG_NF_CONNTRACK_MARK
ct->mark = exp->master->mark;
ct->mark = READ_ONCE(exp->master->mark);
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
ct->secmark = exp->master->secmark;

24
net/netfilter/nf_conntrack_netlink.c
View File

@ -328,9 +328,9 @@ nla_put_failure:
}
#ifdef CONFIG_NF_CONNTRACK_MARK
static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
static int ctnetlink_dump_mark(struct sk_buff *skb, u32 mark)
{
if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
if (nla_put_be32(skb, CTA_MARK, htonl(mark)))
goto nla_put_failure;
return 0;
@ -543,7 +543,7 @@ static int ctnetlink_dump_extinfo(struct sk_buff *skb,
static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
{
if (ctnetlink_dump_status(skb, ct) < 0 ||
ctnetlink_dump_mark(skb, ct) < 0 ||
ctnetlink_dump_mark(skb, READ_ONCE(ct->mark)) < 0 ||
ctnetlink_dump_secctx(skb, ct) < 0 ||
ctnetlink_dump_id(skb, ct) < 0 ||
ctnetlink_dump_use(skb, ct) < 0 ||
@ -722,6 +722,7 @@ ctnetlink_conntrack_event(unsigned int events, const struct nf_ct_event *item)
struct sk_buff *skb;
unsigned int type;
unsigned int flags = 0, group;
u32 mark;
int err;
if (events & (1 << IPCT_DESTROY)) {
@ -826,8 +827,9 @@ ctnetlink_conntrack_event(unsigned int events, const struct nf_ct_event *item)
}
#ifdef CONFIG_NF_CONNTRACK_MARK
if ((events & (1 << IPCT_MARK) || ct->mark)
&& ctnetlink_dump_mark(skb, ct) < 0)
mark = READ_ONCE(ct->mark);
if ((events & (1 << IPCT_MARK) || mark) &&
ctnetlink_dump_mark(skb, mark) < 0)
goto nla_put_failure;
#endif
nlmsg_end(skb, nlh);
@ -1154,7 +1156,7 @@ static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
}
#ifdef CONFIG_NF_CONNTRACK_MARK
if ((ct->mark & filter->mark.mask) != filter->mark.val)
if ((READ_ONCE(ct->mark) & filter->mark.mask) != filter->mark.val)
goto ignore_entry;
#endif
status = (u32)READ_ONCE(ct->status);
@ -2002,9 +2004,9 @@ static void ctnetlink_change_mark(struct nf_conn *ct,
mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
mark = ntohl(nla_get_be32(cda[CTA_MARK]));
newmark = (ct->mark & mask) ^ mark;
if (newmark != ct->mark)
ct->mark = newmark;
newmark = (READ_ONCE(ct->mark) & mask) ^ mark;
if (newmark != READ_ONCE(ct->mark))
WRITE_ONCE(ct->mark, newmark);
}
#endif
@ -2669,6 +2671,7 @@ static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
{
const struct nf_conntrack_zone *zone;
struct nlattr *nest_parms;
u32 mark;
zone = nf_ct_zone(ct);
@ -2730,7 +2733,8 @@ static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
goto nla_put_failure;
#ifdef CONFIG_NF_CONNTRACK_MARK
if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
mark = READ_ONCE(ct->mark);
if (mark && ctnetlink_dump_mark(skb, mark) < 0)
goto nla_put_failure;
#endif
if (ctnetlink_dump_labels(skb, ct) < 0)

2
net/netfilter/nf_conntrack_standalone.c
View File

@ -366,7 +366,7 @@ static int ct_seq_show(struct seq_file *s, void *v)
goto release;
#if defined(CONFIG_NF_CONNTRACK_MARK)
seq_printf(s, "mark=%u ", ct->mark);
seq_printf(s, "mark=%u ", READ_ONCE(ct->mark));
#endif
ct_show_secctx(s, ct);

6
net/netfilter/nft_ct.c
View File

@ -98,7 +98,7 @@ static void nft_ct_get_eval(const struct nft_expr *expr,
return;
#ifdef CONFIG_NF_CONNTRACK_MARK
case NFT_CT_MARK:
*dest = ct->mark;
*dest = READ_ONCE(ct->mark);
return;
#endif
#ifdef CONFIG_NF_CONNTRACK_SECMARK
@ -297,8 +297,8 @@ static void nft_ct_set_eval(const struct nft_expr *expr,
switch (priv->key) {
#ifdef CONFIG_NF_CONNTRACK_MARK
case NFT_CT_MARK:
if (ct->mark != value) {
ct->mark = value;
if (READ_ONCE(ct->mark) != value) {
WRITE_ONCE(ct->mark, value);
nf_conntrack_event_cache(IPCT_MARK, ct);
}
break;

18
net/netfilter/xt_connmark.c
View File

@ -30,6 +30,7 @@ connmark_tg_shift(struct sk_buff *skb, const struct xt_connmark_tginfo2 *info)
u_int32_t new_targetmark;
struct nf_conn *ct;
u_int32_t newmark;
u_int32_t oldmark;
ct = nf_ct_get(skb, &ctinfo);
if (ct == NULL)
@ -37,14 +38,15 @@ connmark_tg_shift(struct sk_buff *skb, const struct xt_connmark_tginfo2 *info)
switch (info->mode) {
case XT_CONNMARK_SET:
newmark = (ct->mark & ~info->ctmask) ^ info->ctmark;
oldmark = READ_ONCE(ct->mark);
newmark = (oldmark & ~info->ctmask) ^ info->ctmark;
if (info->shift_dir == D_SHIFT_RIGHT)
newmark >>= info->shift_bits;
else
newmark <<= info->shift_bits;
if (ct->mark != newmark) {
ct->mark = newmark;
if (READ_ONCE(ct->mark) != newmark) {
WRITE_ONCE(ct->mark, newmark);
nf_conntrack_event_cache(IPCT_MARK, ct);
}
break;
@ -55,15 +57,15 @@ connmark_tg_shift(struct sk_buff *skb, const struct xt_connmark_tginfo2 *info)
else
new_targetmark <<= info->shift_bits;
newmark = (ct->mark & ~info->ctmask) ^
newmark = (READ_ONCE(ct->mark) & ~info->ctmask) ^
new_targetmark;
if (ct->mark != newmark) {
ct->mark = newmark;
if (READ_ONCE(ct->mark) != newmark) {
WRITE_ONCE(ct->mark, newmark);
nf_conntrack_event_cache(IPCT_MARK, ct);
}
break;
case XT_CONNMARK_RESTORE:
new_targetmark = (ct->mark & info->ctmask);
new_targetmark = (READ_ONCE(ct->mark) & info->ctmask);
if (info->shift_dir == D_SHIFT_RIGHT)
new_targetmark >>= info->shift_bits;
else
@ -126,7 +128,7 @@ connmark_mt(const struct sk_buff *skb, struct xt_action_param *par)
if (ct == NULL)
return false;
return ((ct->mark & info->mask) == info->mark) ^ info->invert;
return ((READ_ONCE(ct->mark) & info->mask) == info->mark) ^ info->invert;
}
static int connmark_mt_check(const struct xt_mtchk_param *par)

8
net/openvswitch/conntrack.c
View File

@ -152,7 +152,7 @@ static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo)
static u32 ovs_ct_get_mark(const struct nf_conn *ct)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
return ct ? ct->mark : 0;
return ct ? READ_ONCE(ct->mark) : 0;
#else
return 0;
#endif
@ -340,9 +340,9 @@ static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key,
#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
u32 new_mark;
new_mark = ct_mark | (ct->mark & ~(mask));
if (ct->mark != new_mark) {
ct->mark = new_mark;
new_mark = ct_mark | (READ_ONCE(ct->mark) & ~(mask));
if (READ_ONCE(ct->mark) != new_mark) {
WRITE_ONCE(ct->mark, new_mark);
if (nf_ct_is_confirmed(ct))
nf_conntrack_event_cache(IPCT_MARK, ct);
key->ct.mark = new_mark;

4
net/sched/act_connmark.c
View File

@ -61,7 +61,7 @@ static int tcf_connmark_act(struct sk_buff *skb, const struct tc_action *a,
c = nf_ct_get(skb, &ctinfo);
if (c) {
skb->mark = c->mark;
skb->mark = READ_ONCE(c->mark);
/* using overlimits stats to count how many packets marked */
ca->tcf_qstats.overlimits++;
goto out;
@ -81,7 +81,7 @@ static int tcf_connmark_act(struct sk_buff *skb, const struct tc_action *a,
c = nf_ct_tuplehash_to_ctrack(thash);
/* using overlimits stats to count how many packets marked */
ca->tcf_qstats.overlimits++;
skb->mark = c->mark;
skb->mark = READ_ONCE(c->mark);
nf_ct_put(c);
out:

8
net/sched/act_ct.c
View File

@ -178,7 +178,7 @@ static void tcf_ct_flow_table_add_action_meta(struct nf_conn *ct,
entry = tcf_ct_flow_table_flow_action_get_next(action);
entry->id = FLOW_ACTION_CT_METADATA;
#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
entry->ct_metadata.mark = ct->mark;
entry->ct_metadata.mark = READ_ONCE(ct->mark);
#endif
ctinfo = dir == IP_CT_DIR_ORIGINAL ? IP_CT_ESTABLISHED :
IP_CT_ESTABLISHED_REPLY;
@ -936,9 +936,9 @@ static void tcf_ct_act_set_mark(struct nf_conn *ct, u32 mark, u32 mask)
if (!mask)
return;
new_mark = mark | (ct->mark & ~(mask));
if (ct->mark != new_mark) {
ct->mark = new_mark;
new_mark = mark | (READ_ONCE(ct->mark) & ~(mask));
if (READ_ONCE(ct->mark) != new_mark) {
WRITE_ONCE(ct->mark, new_mark);
if (nf_ct_is_confirmed(ct))
nf_conntrack_event_cache(IPCT_MARK, ct);
}

6
net/sched/act_ctinfo.c
View File

@ -32,7 +32,7 @@ static void tcf_ctinfo_dscp_set(struct nf_conn *ct, struct tcf_ctinfo *ca,
{
u8 dscp, newdscp;
newdscp = (((ct->mark & cp->dscpmask) >> cp->dscpmaskshift) << 2) &
newdscp = (((READ_ONCE(ct->mark) & cp->dscpmask) >> cp->dscpmaskshift) << 2) &
~INET_ECN_MASK;
switch (proto) {
@ -72,7 +72,7 @@ static void tcf_ctinfo_cpmark_set(struct nf_conn *ct, struct tcf_ctinfo *ca,
struct sk_buff *skb)
{
ca->stats_cpmark_set++;
skb->mark = ct->mark & cp->cpmarkmask;
skb->mark = READ_ONCE(ct->mark) & cp->cpmarkmask;
}
static int tcf_ctinfo_act(struct sk_buff *skb, const struct tc_action *a,
@ -130,7 +130,7 @@ static int tcf_ctinfo_act(struct sk_buff *skb, const struct tc_action *a,
}
if (cp->mode & CTINFO_MODE_DSCP)
if (!cp->dscpstatemask || (ct->mark & cp->dscpstatemask))
if (!cp->dscpstatemask || (READ_ONCE(ct->mark) & cp->dscpstatemask))
tcf_ctinfo_dscp_set(ct, ca, cp, skb, wlen, proto);
if (cp->mode & CTINFO_MODE_CPMARK)