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authorJakub Kicinski <kuba@kernel.org>2021-05-07 16:10:12 -0700
committerJakub Kicinski <kuba@kernel.org>2021-05-07 16:10:12 -0700
commit55bc1af3d9115d669570aa633e5428d6e2302e8f (patch)
treea506859e1d5a63dbf3378a06f6fdd31f39b9097f
parente4d4a27220a3afdfacf7fbcdc895b08d754f0de1 (diff)
parent6c8774a94e6ad26f29ef103c8671f55c255c6201 (diff)
downloadandroid-dev-55bc1af3d9115d669570aa633e5428d6e2302e8f.tar.gz
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf
Pablo Neira Ayuso says: ==================== Netfilter fixes for net 1) Add SECMARK revision 1 to fix incorrect layout that prevents from remove rule with this target, from Phil Sutter. 2) Fix pernet exit path spat in arptables, from Florian Westphal. 3) Missing rcu_read_unlock() for unknown nfnetlink callbacks, reported by syzbot, from Eric Dumazet. 4) Missing check for skb_header_pointer() NULL pointer in nfnetlink_osf. 5) Remove BUG_ON() after skb_header_pointer() from packet path in several conntrack helper and the TCP tracker. 6) Fix memleak in the new object error path of userdata. 7) Avoid overflows in nft_hash_buckets(), reported by syzbot, also from Eric. 8) Avoid overflows in 32bit arches, from Eric. * git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf: netfilter: nftables: avoid potential overflows on 32bit arches netfilter: nftables: avoid overflows in nft_hash_buckets() netfilter: nftables: Fix a memleak from userdata error path in new objects netfilter: remove BUG_ON() after skb_header_pointer() netfilter: nfnetlink_osf: Fix a missing skb_header_pointer() NULL check netfilter: nfnetlink: add a missing rcu_read_unlock() netfilter: arptables: use pernet ops struct during unregister netfilter: xt_SECMARK: add new revision to fix structure layout ==================== Link: https://lore.kernel.org/r/20210507174739.1850-1-pablo@netfilter.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
-rw-r--r--include/linux/netfilter_arp/arp_tables.h3
-rw-r--r--include/uapi/linux/netfilter/xt_SECMARK.h6
-rw-r--r--net/ipv4/netfilter/arp_tables.c5
-rw-r--r--net/ipv4/netfilter/arptable_filter.c2
-rw-r--r--net/netfilter/nf_conntrack_ftp.c5
-rw-r--r--net/netfilter/nf_conntrack_h323_main.c3
-rw-r--r--net/netfilter/nf_conntrack_irc.c5
-rw-r--r--net/netfilter/nf_conntrack_pptp.c4
-rw-r--r--net/netfilter/nf_conntrack_proto_tcp.c6
-rw-r--r--net/netfilter/nf_conntrack_sane.c5
-rw-r--r--net/netfilter/nf_tables_api.c11
-rw-r--r--net/netfilter/nfnetlink.c1
-rw-r--r--net/netfilter/nfnetlink_osf.c2
-rw-r--r--net/netfilter/nft_set_hash.c20
-rw-r--r--net/netfilter/xt_SECMARK.c88
15 files changed, 124 insertions, 42 deletions
diff --git a/include/linux/netfilter_arp/arp_tables.h b/include/linux/netfilter_arp/arp_tables.h
index 2aab9612f6ab..4f9a4b3c5892 100644
--- a/include/linux/netfilter_arp/arp_tables.h
+++ b/include/linux/netfilter_arp/arp_tables.h
@@ -53,8 +53,7 @@ int arpt_register_table(struct net *net, const struct xt_table *table,
const struct arpt_replace *repl,
const struct nf_hook_ops *ops);
void arpt_unregister_table(struct net *net, const char *name);
-void arpt_unregister_table_pre_exit(struct net *net, const char *name,
- const struct nf_hook_ops *ops);
+void arpt_unregister_table_pre_exit(struct net *net, const char *name);
extern unsigned int arpt_do_table(struct sk_buff *skb,
const struct nf_hook_state *state,
struct xt_table *table);
diff --git a/include/uapi/linux/netfilter/xt_SECMARK.h b/include/uapi/linux/netfilter/xt_SECMARK.h
index 1f2a708413f5..beb2cadba8a9 100644
--- a/include/uapi/linux/netfilter/xt_SECMARK.h
+++ b/include/uapi/linux/netfilter/xt_SECMARK.h
@@ -20,4 +20,10 @@ struct xt_secmark_target_info {
char secctx[SECMARK_SECCTX_MAX];
};
+struct xt_secmark_target_info_v1 {
+ __u8 mode;
+ char secctx[SECMARK_SECCTX_MAX];
+ __u32 secid;
+};
+
#endif /*_XT_SECMARK_H_target */
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index cf20316094d0..c53f14b94356 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1556,13 +1556,12 @@ out_free:
return ret;
}
-void arpt_unregister_table_pre_exit(struct net *net, const char *name,
- const struct nf_hook_ops *ops)
+void arpt_unregister_table_pre_exit(struct net *net, const char *name)
{
struct xt_table *table = xt_find_table(net, NFPROTO_ARP, name);
if (table)
- nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks));
+ nf_unregister_net_hooks(net, table->ops, hweight32(table->valid_hooks));
}
EXPORT_SYMBOL(arpt_unregister_table_pre_exit);
diff --git a/net/ipv4/netfilter/arptable_filter.c b/net/ipv4/netfilter/arptable_filter.c
index b8f45e9bbec8..6922612df456 100644
--- a/net/ipv4/netfilter/arptable_filter.c
+++ b/net/ipv4/netfilter/arptable_filter.c
@@ -54,7 +54,7 @@ static int __net_init arptable_filter_table_init(struct net *net)
static void __net_exit arptable_filter_net_pre_exit(struct net *net)
{
- arpt_unregister_table_pre_exit(net, "filter", arpfilter_ops);
+ arpt_unregister_table_pre_exit(net, "filter");
}
static void __net_exit arptable_filter_net_exit(struct net *net)
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index b22801f97bce..a414274338cf 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -413,7 +413,10 @@ static int help(struct sk_buff *skb,
spin_lock_bh(&nf_ftp_lock);
fb_ptr = skb_header_pointer(skb, dataoff, datalen, ftp_buffer);
- BUG_ON(fb_ptr == NULL);
+ if (!fb_ptr) {
+ spin_unlock_bh(&nf_ftp_lock);
+ return NF_ACCEPT;
+ }
ends_in_nl = (fb_ptr[datalen - 1] == '\n');
seq = ntohl(th->seq) + datalen;
diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c
index 8ba037b76ad3..aafaff00baf1 100644
--- a/net/netfilter/nf_conntrack_h323_main.c
+++ b/net/netfilter/nf_conntrack_h323_main.c
@@ -146,7 +146,8 @@ static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
/* Get first TPKT pointer */
tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
h323_buffer);
- BUG_ON(tpkt == NULL);
+ if (!tpkt)
+ goto clear_out;
/* Validate TPKT identifier */
if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
diff --git a/net/netfilter/nf_conntrack_irc.c b/net/netfilter/nf_conntrack_irc.c
index e40988a2f22f..08ee4e760a3d 100644
--- a/net/netfilter/nf_conntrack_irc.c
+++ b/net/netfilter/nf_conntrack_irc.c
@@ -143,7 +143,10 @@ static int help(struct sk_buff *skb, unsigned int protoff,
spin_lock_bh(&irc_buffer_lock);
ib_ptr = skb_header_pointer(skb, dataoff, skb->len - dataoff,
irc_buffer);
- BUG_ON(ib_ptr == NULL);
+ if (!ib_ptr) {
+ spin_unlock_bh(&irc_buffer_lock);
+ return NF_ACCEPT;
+ }
data = ib_ptr;
data_limit = ib_ptr + skb->len - dataoff;
diff --git a/net/netfilter/nf_conntrack_pptp.c b/net/netfilter/nf_conntrack_pptp.c
index 5105d4250012..7d5708b92138 100644
--- a/net/netfilter/nf_conntrack_pptp.c
+++ b/net/netfilter/nf_conntrack_pptp.c
@@ -544,7 +544,9 @@ conntrack_pptp_help(struct sk_buff *skb, unsigned int protoff,
nexthdr_off = protoff;
tcph = skb_header_pointer(skb, nexthdr_off, sizeof(_tcph), &_tcph);
- BUG_ON(!tcph);
+ if (!tcph)
+ return NF_ACCEPT;
+
nexthdr_off += tcph->doff * 4;
datalen = tcplen - tcph->doff * 4;
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 318b8f723349..34e22416a721 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -338,7 +338,8 @@ static void tcp_options(const struct sk_buff *skb,
ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr),
length, buff);
- BUG_ON(ptr == NULL);
+ if (!ptr)
+ return;
state->td_scale =
state->flags = 0;
@@ -394,7 +395,8 @@ static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff,
ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr),
length, buff);
- BUG_ON(ptr == NULL);
+ if (!ptr)
+ return;
/* Fast path for timestamp-only option */
if (length == TCPOLEN_TSTAMP_ALIGNED
diff --git a/net/netfilter/nf_conntrack_sane.c b/net/netfilter/nf_conntrack_sane.c
index 1aebd6569d4e..fcb33b1d5456 100644
--- a/net/netfilter/nf_conntrack_sane.c
+++ b/net/netfilter/nf_conntrack_sane.c
@@ -95,7 +95,10 @@ static int help(struct sk_buff *skb,
spin_lock_bh(&nf_sane_lock);
sb_ptr = skb_header_pointer(skb, dataoff, datalen, sane_buffer);
- BUG_ON(sb_ptr == NULL);
+ if (!sb_ptr) {
+ spin_unlock_bh(&nf_sane_lock);
+ return NF_ACCEPT;
+ }
if (dir == IP_CT_DIR_ORIGINAL) {
if (datalen != sizeof(struct sane_request))
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 0b7fe0a902ff..d63d2d8f769c 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4184,6 +4184,7 @@ static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
unsigned char *udata;
struct nft_set *set;
struct nft_ctx ctx;
+ size_t alloc_size;
u64 timeout;
char *name;
int err, i;
@@ -4329,8 +4330,10 @@ static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
size = 0;
if (ops->privsize != NULL)
size = ops->privsize(nla, &desc);
-
- set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
+ alloc_size = sizeof(*set) + size + udlen;
+ if (alloc_size < size)
+ return -ENOMEM;
+ set = kvzalloc(alloc_size, GFP_KERNEL);
if (!set)
return -ENOMEM;
@@ -6615,9 +6618,9 @@ err_obj_ht:
INIT_LIST_HEAD(&obj->list);
return err;
err_trans:
- kfree(obj->key.name);
-err_userdata:
kfree(obj->udata);
+err_userdata:
+ kfree(obj->key.name);
err_strdup:
if (obj->ops->destroy)
obj->ops->destroy(&ctx, obj);
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index d7a9628b6cee..e8dbd8379027 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -295,6 +295,7 @@ replay:
nfnl_unlock(subsys_id);
break;
default:
+ rcu_read_unlock();
err = -EINVAL;
break;
}
diff --git a/net/netfilter/nfnetlink_osf.c b/net/netfilter/nfnetlink_osf.c
index e8f8875c6884..0fa2e2030427 100644
--- a/net/netfilter/nfnetlink_osf.c
+++ b/net/netfilter/nfnetlink_osf.c
@@ -186,6 +186,8 @@ static const struct tcphdr *nf_osf_hdr_ctx_init(struct nf_osf_hdr_ctx *ctx,
ctx->optp = skb_header_pointer(skb, ip_hdrlen(skb) +
sizeof(struct tcphdr), ctx->optsize, opts);
+ if (!ctx->optp)
+ return NULL;
}
return tcp;
diff --git a/net/netfilter/nft_set_hash.c b/net/netfilter/nft_set_hash.c
index 58f576abcd4a..7b3d0a78c569 100644
--- a/net/netfilter/nft_set_hash.c
+++ b/net/netfilter/nft_set_hash.c
@@ -412,9 +412,17 @@ static void nft_rhash_destroy(const struct nft_set *set)
(void *)set);
}
+/* Number of buckets is stored in u32, so cap our result to 1U<<31 */
+#define NFT_MAX_BUCKETS (1U << 31)
+
static u32 nft_hash_buckets(u32 size)
{
- return roundup_pow_of_two(size * 4 / 3);
+ u64 val = div_u64((u64)size * 4, 3);
+
+ if (val >= NFT_MAX_BUCKETS)
+ return NFT_MAX_BUCKETS;
+
+ return roundup_pow_of_two(val);
}
static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features,
@@ -615,7 +623,7 @@ static u64 nft_hash_privsize(const struct nlattr * const nla[],
const struct nft_set_desc *desc)
{
return sizeof(struct nft_hash) +
- nft_hash_buckets(desc->size) * sizeof(struct hlist_head);
+ (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head);
}
static int nft_hash_init(const struct nft_set *set,
@@ -655,8 +663,8 @@ static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features,
return false;
est->size = sizeof(struct nft_hash) +
- nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
- desc->size * sizeof(struct nft_hash_elem);
+ (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
+ (u64)desc->size * sizeof(struct nft_hash_elem);
est->lookup = NFT_SET_CLASS_O_1;
est->space = NFT_SET_CLASS_O_N;
@@ -673,8 +681,8 @@ static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features
return false;
est->size = sizeof(struct nft_hash) +
- nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
- desc->size * sizeof(struct nft_hash_elem);
+ (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
+ (u64)desc->size * sizeof(struct nft_hash_elem);
est->lookup = NFT_SET_CLASS_O_1;
est->space = NFT_SET_CLASS_O_N;
diff --git a/net/netfilter/xt_SECMARK.c b/net/netfilter/xt_SECMARK.c
index 75625d13e976..498a0bf6f044 100644
--- a/net/netfilter/xt_SECMARK.c
+++ b/net/netfilter/xt_SECMARK.c
@@ -24,10 +24,9 @@ MODULE_ALIAS("ip6t_SECMARK");
static u8 mode;
static unsigned int
-secmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
+secmark_tg(struct sk_buff *skb, const struct xt_secmark_target_info_v1 *info)
{
u32 secmark = 0;
- const struct xt_secmark_target_info *info = par->targinfo;
switch (mode) {
case SECMARK_MODE_SEL:
@@ -41,7 +40,7 @@ secmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
return XT_CONTINUE;
}
-static int checkentry_lsm(struct xt_secmark_target_info *info)
+static int checkentry_lsm(struct xt_secmark_target_info_v1 *info)
{
int err;
@@ -73,15 +72,15 @@ static int checkentry_lsm(struct xt_secmark_target_info *info)
return 0;
}
-static int secmark_tg_check(const struct xt_tgchk_param *par)
+static int
+secmark_tg_check(const char *table, struct xt_secmark_target_info_v1 *info)
{
- struct xt_secmark_target_info *info = par->targinfo;
int err;
- if (strcmp(par->table, "mangle") != 0 &&
- strcmp(par->table, "security") != 0) {
+ if (strcmp(table, "mangle") != 0 &&
+ strcmp(table, "security") != 0) {
pr_info_ratelimited("only valid in \'mangle\' or \'security\' table, not \'%s\'\n",
- par->table);
+ table);
return -EINVAL;
}
@@ -116,25 +115,76 @@ static void secmark_tg_destroy(const struct xt_tgdtor_param *par)
}
}
-static struct xt_target secmark_tg_reg __read_mostly = {
- .name = "SECMARK",
- .revision = 0,
- .family = NFPROTO_UNSPEC,
- .checkentry = secmark_tg_check,
- .destroy = secmark_tg_destroy,
- .target = secmark_tg,
- .targetsize = sizeof(struct xt_secmark_target_info),
- .me = THIS_MODULE,
+static int secmark_tg_check_v0(const struct xt_tgchk_param *par)
+{
+ struct xt_secmark_target_info *info = par->targinfo;
+ struct xt_secmark_target_info_v1 newinfo = {
+ .mode = info->mode,
+ };
+ int ret;
+
+ memcpy(newinfo.secctx, info->secctx, SECMARK_SECCTX_MAX);
+
+ ret = secmark_tg_check(par->table, &newinfo);
+ info->secid = newinfo.secid;
+
+ return ret;
+}
+
+static unsigned int
+secmark_tg_v0(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ const struct xt_secmark_target_info *info = par->targinfo;
+ struct xt_secmark_target_info_v1 newinfo = {
+ .secid = info->secid,
+ };
+
+ return secmark_tg(skb, &newinfo);
+}
+
+static int secmark_tg_check_v1(const struct xt_tgchk_param *par)
+{
+ return secmark_tg_check(par->table, par->targinfo);
+}
+
+static unsigned int
+secmark_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ return secmark_tg(skb, par->targinfo);
+}
+
+static struct xt_target secmark_tg_reg[] __read_mostly = {
+ {
+ .name = "SECMARK",
+ .revision = 0,
+ .family = NFPROTO_UNSPEC,
+ .checkentry = secmark_tg_check_v0,
+ .destroy = secmark_tg_destroy,
+ .target = secmark_tg_v0,
+ .targetsize = sizeof(struct xt_secmark_target_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "SECMARK",
+ .revision = 1,
+ .family = NFPROTO_UNSPEC,
+ .checkentry = secmark_tg_check_v1,
+ .destroy = secmark_tg_destroy,
+ .target = secmark_tg_v1,
+ .targetsize = sizeof(struct xt_secmark_target_info_v1),
+ .usersize = offsetof(struct xt_secmark_target_info_v1, secid),
+ .me = THIS_MODULE,
+ },
};
static int __init secmark_tg_init(void)
{
- return xt_register_target(&secmark_tg_reg);
+ return xt_register_targets(secmark_tg_reg, ARRAY_SIZE(secmark_tg_reg));
}
static void __exit secmark_tg_exit(void)
{
- xt_unregister_target(&secmark_tg_reg);
+ xt_unregister_targets(secmark_tg_reg, ARRAY_SIZE(secmark_tg_reg));
}
module_init(secmark_tg_init);