netfilter: nf_tables: fix suspicious RCU usage in nft_chain_stats_replace()

basechain->stats is rcu protected data which is updated from
nft_chain_stats_replace(). This function is executed from the commit
phase which holds the pernet nf_tables commit mutex - not the global
nfnetlink subsystem mutex.

Test commands to reproduce the problem are:
   %iptables-nft -I INPUT
   %iptables-nft -Z
   %iptables-nft -Z

This patch uses RCU calls to handle basechain->stats updates to fix a
splat that looks like:

[89279.358755] =============================
[89279.363656] WARNING: suspicious RCU usage
[89279.368458] 4.20.0-rc2+ #44 Tainted: G        W    L
[89279.374661] -----------------------------
[89279.379542] net/netfilter/nf_tables_api.c:1404 suspicious rcu_dereference_protected() usage!
[...]
[89279.406556] 1 lock held by iptables-nft/5225:
[89279.411728]  #0: 00000000bf45a000 (&net->nft.commit_mutex){+.+.}, at: nf_tables_valid_genid+0x1f/0x70 [nf_tables]
[89279.424022] stack backtrace:
[89279.429236] CPU: 0 PID: 5225 Comm: iptables-nft Tainted: G        W    L    4.20.0-rc2+ #44
[89279.430135] Call Trace:
[89279.430135]  dump_stack+0xc9/0x16b
[89279.430135]  ? show_regs_print_info+0x5/0x5
[89279.430135]  ? lockdep_rcu_suspicious+0x117/0x160
[89279.430135]  nft_chain_commit_update+0x4ea/0x640 [nf_tables]
[89279.430135]  ? sched_clock_local+0xd4/0x140
[89279.430135]  ? check_flags.part.35+0x440/0x440
[89279.430135]  ? __rhashtable_remove_fast.constprop.67+0xec0/0xec0 [nf_tables]
[89279.430135]  ? sched_clock_cpu+0x126/0x170
[89279.430135]  ? find_held_lock+0x39/0x1c0
[89279.430135]  ? hlock_class+0x140/0x140
[89279.430135]  ? is_bpf_text_address+0x5/0xf0
[89279.430135]  ? check_flags.part.35+0x440/0x440
[89279.430135]  ? __lock_is_held+0xb4/0x140
[89279.430135]  nf_tables_commit+0x2555/0x39c0 [nf_tables]

Fixes: f102d66b335a4 ("netfilter: nf_tables: use dedicated mutex to guard transactions")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/include/linux/netfilter/nfnetlink.h b/include/linux/netfilter/nfnetlink.h
index 4a520d3..cf09ab3 100644 (file)
--- a/include/linux/netfilter/nfnetlink.h
+++ b/include/linux/netfilter/nfnetlink.h
@@ -62,18 +62,6 @@ static inline bool lockdep_nfnl_is_held(__u8 subsys_id)
 }
 #endif /* CONFIG_PROVE_LOCKING */
 
-/*
- * nfnl_dereference - fetch RCU pointer when updates are prevented by subsys mutex
- *
- * @p: The pointer to read, prior to dereferencing
- * @ss: The nfnetlink subsystem ID
- *
- * Return the value of the specified RCU-protected pointer, but omit
- * the READ_ONCE(), because caller holds the NFNL subsystem mutex.
- */
-#define nfnl_dereference(p, ss)                                        \
-       rcu_dereference_protected(p, lockdep_nfnl_is_held(ss))
-
 #define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
        MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
 

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 2e61aab..6e548d7 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1216,7 +1216,8 @@ static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
                if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
                        goto nla_put_failure;
 
-               if (basechain->stats && nft_dump_stats(skb, basechain->stats))
+               if (rcu_access_pointer(basechain->stats) &&
+                   nft_dump_stats(skb, rcu_dereference(basechain->stats)))
                        goto nla_put_failure;
        }
 
@@ -1392,7 +1393,8 @@ static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
        return newstats;
 }
 
-static void nft_chain_stats_replace(struct nft_base_chain *chain,
+static void nft_chain_stats_replace(struct net *net,
+                                   struct nft_base_chain *chain,
                                    struct nft_stats __percpu *newstats)
 {
        struct nft_stats __percpu *oldstats;
@@ -1400,8 +1402,9 @@ static void nft_chain_stats_replace(struct nft_base_chain *chain,
        if (newstats == NULL)
                return;
 
-       if (chain->stats) {
-               oldstats = nfnl_dereference(chain->stats, NFNL_SUBSYS_NFTABLES);
+       if (rcu_access_pointer(chain->stats)) {
+               oldstats = rcu_dereference_protected(chain->stats,
+                                       lockdep_commit_lock_is_held(net));
                rcu_assign_pointer(chain->stats, newstats);
                synchronize_rcu();
                free_percpu(oldstats);
@@ -1439,9 +1442,10 @@ static void nf_tables_chain_destroy(struct nft_ctx *ctx)
                struct nft_base_chain *basechain = nft_base_chain(chain);
 
                module_put(basechain->type->owner);
-               free_percpu(basechain->stats);
-               if (basechain->stats)
+               if (rcu_access_pointer(basechain->stats)) {
                        static_branch_dec(&nft_counters_enabled);
+                       free_percpu(rcu_dereference_raw(basechain->stats));
+               }
                kfree(chain->name);
                kfree(basechain);
        } else {
@@ -1590,7 +1594,7 @@ static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
                                kfree(basechain);
                                return PTR_ERR(stats);
                        }
-                       basechain->stats = stats;
+                       rcu_assign_pointer(basechain->stats, stats);
                        static_branch_inc(&nft_counters_enabled);
                }
 
@@ -6180,7 +6184,8 @@ static void nft_chain_commit_update(struct nft_trans *trans)
                return;
 
        basechain = nft_base_chain(trans->ctx.chain);
-       nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
+       nft_chain_stats_replace(trans->ctx.net, basechain,
+                               nft_trans_chain_stats(trans));
 
        switch (nft_trans_chain_policy(trans)) {
        case NF_DROP:

diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index 3fbce3b..a505002 100644 (file)
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -101,7 +101,7 @@ static noinline void nft_update_chain_stats(const struct nft_chain *chain,
        struct nft_stats *stats;
 
        base_chain = nft_base_chain(chain);
-       if (!base_chain->stats)
+       if (!rcu_access_pointer(base_chain->stats))
                return;
 
        local_bh_disable();