diff mbox series

[net,v2] net/tcp: Disable TCP-AO static key after RCU grace period

Message ID 20240730-tcp-ao-static-branch-rcu-v2-1-33dc2b7adac8@gmail.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series [net,v2] net/tcp: Disable TCP-AO static key after RCU grace period | expand

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Context Check Description
netdev/series_format success Single patches do not need cover letters
netdev/tree_selection success Clearly marked for net
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 7 this patch: 7
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 6 of 6 maintainers
netdev/build_clang success Errors and warnings before: 7 this patch: 7
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 7 this patch: 7
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 64 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest warning net-next-2024-07-30--03-00 (tests: 675)

Commit Message

Dmitry Safonov via B4 Relay July 30, 2024, 12:33 a.m. UTC 
From: Dmitry Safonov <0x7f454c46@gmail.com>

The lifetime of TCP-AO static_key is the same as the last
tcp_ao_info. On the socket destruction tcp_ao_info ceases to be
with RCU grace period, while tcp-ao static branch is currently deferred
destructed. The static key definition is
: DEFINE_STATIC_KEY_DEFERRED_FALSE(tcp_ao_needed, HZ);

which means that if RCU grace period is delayed by more than a second
and tcp_ao_needed is in the process of disablement, other CPUs may
yet see tcp_ao_info which atent dead, but soon-to-be.
And that breaks the assumption of static_key_fast_inc_not_disabled().

See the comment near the definition:
> * The caller must make sure that the static key can't get disabled while
> * in this function. It doesn't patch jump labels, only adds a user to
> * an already enabled static key.

Originally it was introduced in commit eb8c507296f6 ("jump_label:
Prevent key->enabled int overflow"), which is needed for the atomic
contexts, one of which would be the creation of a full socket from a
request socket. In that atomic context, it's known by the presence
of the key (md5/ao) that the static branch is already enabled.
So, the ref counter for that static branch is just incremented
instead of holding the proper mutex.
static_key_fast_inc_not_disabled() is just a helper for such usage
case. But it must not be used if the static branch could get disabled
in parallel as it's not protected by jump_label_mutex and as a result,
races with jump_label_update() implementation details.

Happened on netdev test-bot[1], so not a theoretical issue:

[] jump_label: Fatal kernel bug, unexpected op at tcp_inbound_hash+0x1a7/0x870 [ffffffffa8c4e9b7] (eb 50 0f 1f 44 != 66 90 0f 1f 00)) size:2 type:1
[] ------------[ cut here ]------------
[] kernel BUG at arch/x86/kernel/jump_label.c:73!
[] Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[] CPU: 3 PID: 243 Comm: kworker/3:3 Not tainted 6.10.0-virtme #1
[] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[] Workqueue: events jump_label_update_timeout
[] RIP: 0010:__jump_label_patch+0x2f6/0x350
...
[] Call Trace:
[]  <TASK>
[]  arch_jump_label_transform_queue+0x6c/0x110
[]  __jump_label_update+0xef/0x350
[]  __static_key_slow_dec_cpuslocked.part.0+0x3c/0x60
[]  jump_label_update_timeout+0x2c/0x40
[]  process_one_work+0xe3b/0x1670
[]  worker_thread+0x587/0xce0
[]  kthread+0x28a/0x350
[]  ret_from_fork+0x31/0x70
[]  ret_from_fork_asm+0x1a/0x30
[]  </TASK>
[] Modules linked in: veth
[] ---[ end trace 0000000000000000 ]---
[] RIP: 0010:__jump_label_patch+0x2f6/0x350

[1]: https://netdev-3.bots.linux.dev/vmksft-tcp-ao-dbg/results/696681/5-connect-deny-ipv6/stderr

Cc: stable@kernel.org
Fixes: 67fa83f7c86a ("net/tcp: Add static_key for TCP-AO")
Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com>
---
Changes in v2:
- Use rcu_assign_pointer() in tcp_ao_destroy_sock()
- Combined both ao_info and keys destruction in one RCU callback,
  tcp_ao_info_free_rcu() (suggested-by Jakub)
- Hopefully improved a bit the commit message
- Link to v1: https://lore.kernel.org/r/20240725-tcp-ao-static-branch-rcu-v1-1-021d009beebf@gmail.com
---
 net/ipv4/tcp_ao.c | 45 ++++++++++++++++++++++++++++++++-------------
 1 file changed, 32 insertions(+), 13 deletions(-)


---
base-commit: 2accfdb7eff65f390c4308b0e9cb7c3fe48ad63c
change-id: 20240725-tcp-ao-static-branch-rcu-85ede7b3a1a5

Best regards,

Comments

Jakub Kicinski July 31, 2024, 1:37 a.m. UTC | #1 
On Tue, 30 Jul 2024 01:33:17 +0100 Dmitry Safonov via B4 Relay wrote:
> +	struct hlist_node *n;
> +
> +	hlist_for_each_entry_safe(key, n, &ao->head, node)
> +		total_ao_sk_mem += tcp_ao_sizeof_key(key);

nit:

s/_safe//

no need to safely iterate if we're not modifying the list
Dmitry Safonov July 31, 2024, 2:01 a.m. UTC | #2 
On Wed, 31 Jul 2024 at 02:37, Jakub Kicinski <kuba@kernel.org> wrote:
>
> On Tue, 30 Jul 2024 01:33:17 +0100 Dmitry Safonov via B4 Relay wrote:
> > +     struct hlist_node *n;
> > +
> > +     hlist_for_each_entry_safe(key, n, &ao->head, node)
> > +             total_ao_sk_mem += tcp_ao_sizeof_key(key);
>
> nit:
>
> s/_safe//
>
> no need to safely iterate if we're not modifying the list

Certainly! The keys can't be deleted by another CPU once it's
tcp_ao_destroy_sock(), somehow haven't thought about the iterator
here.
Will send v3.

Thanks,
             Dmitry
diff mbox series

Patch

diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
index 85531437890c..e2ea6b3570e2 100644
--- a/net/ipv4/tcp_ao.c
+++ b/net/ipv4/tcp_ao.c
@@ -267,32 +267,51 @@  static void tcp_ao_key_free_rcu(struct rcu_head *head)
 	kfree_sensitive(key);
 }
 
-void tcp_ao_destroy_sock(struct sock *sk, bool twsk)
+static void tcp_ao_info_free_rcu(struct rcu_head *head)
 {
-	struct tcp_ao_info *ao;
+	struct tcp_ao_info *ao = container_of(head, struct tcp_ao_info, rcu);
 	struct tcp_ao_key *key;
 	struct hlist_node *n;
 
+	hlist_for_each_entry_safe(key, n, &ao->head, node) {
+		hlist_del_rcu(&key->node);
+		tcp_sigpool_release(key->tcp_sigpool_id);
+		kfree_sensitive(key);
+	}
+	kfree(ao);
+	static_branch_slow_dec_deferred(&tcp_ao_needed);
+}
+
+static void tcp_ao_sk_omem_free(struct sock *sk, struct tcp_ao_info *ao)
+{
+	size_t total_ao_sk_mem = 0;
+	struct tcp_ao_key *key;
+	struct hlist_node *n;
+
+	hlist_for_each_entry_safe(key, n, &ao->head, node)
+		total_ao_sk_mem += tcp_ao_sizeof_key(key);
+
+	atomic_sub(total_ao_sk_mem, &sk->sk_omem_alloc);
+}
+
+void tcp_ao_destroy_sock(struct sock *sk, bool twsk)
+{
+	struct tcp_ao_info *ao;
+
 	if (twsk) {
 		ao = rcu_dereference_protected(tcp_twsk(sk)->ao_info, 1);
-		tcp_twsk(sk)->ao_info = NULL;
+		rcu_assign_pointer(tcp_twsk(sk)->ao_info, NULL);
 	} else {
 		ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, 1);
-		tcp_sk(sk)->ao_info = NULL;
+		rcu_assign_pointer(tcp_sk(sk)->ao_info, NULL);
 	}
 
 	if (!ao || !refcount_dec_and_test(&ao->refcnt))
 		return;
 
-	hlist_for_each_entry_safe(key, n, &ao->head, node) {
-		hlist_del_rcu(&key->node);
-		if (!twsk)
-			atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc);
-		call_rcu(&key->rcu, tcp_ao_key_free_rcu);
-	}
-
-	kfree_rcu(ao, rcu);
-	static_branch_slow_dec_deferred(&tcp_ao_needed);
+	if (!twsk)
+		tcp_ao_sk_omem_free(sk, ao);
+	call_rcu(&ao->rcu, tcp_ao_info_free_rcu);
 }
 
 void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp)