From patchwork Wed Mar 24 20:59:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Fastabend X-Patchwork-Id: 12162369 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3D7DAC433DB for ; Wed, 24 Mar 2021 21:01:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EF22A61A1B for ; Wed, 24 Mar 2021 21:01:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238260AbhCXVA3 (ORCPT ); Wed, 24 Mar 2021 17:00:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50422 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238179AbhCXVAD (ORCPT ); Wed, 24 Mar 2021 17:00:03 -0400 Received: from mail-io1-xd35.google.com (mail-io1-xd35.google.com [IPv6:2607:f8b0:4864:20::d35]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C812C06174A; Wed, 24 Mar 2021 14:00:03 -0700 (PDT) Received: by mail-io1-xd35.google.com with SMTP id k8so22987042iop.12; Wed, 24 Mar 2021 14:00:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=JSLvLQ4vIB1tCT7F95RR9CNrrqHl227D5CnKMLZjSuI=; b=oQUzeBJCqcqQT26IiwrWHKW9lbKqjMli2q2q40CPOKt5L87bCDvjEP6JvBSt9U9zIz +sa9T8y35bSt1pqyj70aZDMDh7loe/wU8/6y6pDMRtcp0yMkn2F+RCKNSJMA+wrjucvq FwbAKFrOkwnNg+te85B5xo91VnPTD4pqTGHez6X4fs70pm0IC04ca+jyeRMe2cLSRTP2 KxhB1EJlsv8W4WNEFlNJAoV45pjESlyIEObNt9xdlTWQ9T2qzBqp6yuFzg7bflzArNQw ET+Ts317ry0RX9BBNQXSHkIFje0SKdkqnQDVIhuqrb/v5x42LAU/Z2p4wRKfqw5TBqlB D84w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=JSLvLQ4vIB1tCT7F95RR9CNrrqHl227D5CnKMLZjSuI=; b=ZL3Tgs//pN9S/RubIUSMLK1izCS6IauyHqFN8T4IgYQqpFGqFozGpBemGZNeEjJC4y PlqeNTQK6X9gMUMUgOFJFfV8slCxVj/qTN8ms1WzLtTIi7E2UQ/ITjmBcnHNBf95bgCN iapNzpvWs+3m7jKdLiEQScemulgyi5YCWRgtuQ4sMpcQdw+tamhFoGZmnsMzElPlWsOZ 5REX0ZPscOQSgGz6dUxa23Lhq+lcJGzOdMy0VQh1JVpYIuf9I2SFrTj1J/GJ0UJJC3Qa R1SoWcT/VJjx/LKApQRUww4VLSA95G/GU2qzhCbYDrNAQwcnuIodSHnSSYteWq3zuq5C 7tqA== X-Gm-Message-State: AOAM5309ezQ8JrhwshAxjzIIHH3e+zq3cVVdpANyHUq9uya8NKJxWOBq AGB551mWMDlQ6yK1BUaOR9g= X-Google-Smtp-Source: ABdhPJwY62GyJ44fG+G5cOGCvOeIjMrdESV97r1+qL2CIeVnHNd928D1M4iXnUFdTK9K9D5Hlnd9RQ== X-Received: by 2002:a05:6638:1614:: with SMTP id x20mr4622190jas.19.1616619602834; Wed, 24 Mar 2021 14:00:02 -0700 (PDT) Received: from [127.0.1.1] ([172.242.244.146]) by smtp.gmail.com with ESMTPSA id h12sm1683822ilj.41.2021.03.24.13.59.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Mar 2021 14:00:02 -0700 (PDT) Subject: [bpf PATCH 2/2] bpf, sockmap: fix incorrect fwd_alloc accounting From: John Fastabend To: john.fastabend@gmail.com, andrii@kernel.org, daniel@iogearbox.net, ast@fb.com Cc: xiyou.wangcong@gmail.com, bpf@vger.kernel.org, netdev@vger.kernel.org, lmb@cloudflare.com Date: Wed, 24 Mar 2021 13:59:49 -0700 Message-ID: <161661958954.28508.16923012330549206770.stgit@john-Precision-5820-Tower> In-Reply-To: <161661943080.28508.5809575518293376322.stgit@john-Precision-5820-Tower> References: <161661943080.28508.5809575518293376322.stgit@john-Precision-5820-Tower> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Incorrect accounting fwd_alloc can result in a warning when the socket is torn down, [18455.319240] WARNING: CPU: 0 PID: 24075 at net/core/stream.c:208 sk_stream_kill_queues+0x21f/0x230 [...] [18455.319543] Call Trace: [18455.319556] inet_csk_destroy_sock+0xba/0x1f0 [18455.319577] tcp_rcv_state_process+0x1b4e/0x2380 [18455.319593] ? lock_downgrade+0x3a0/0x3a0 [18455.319617] ? tcp_finish_connect+0x1e0/0x1e0 [18455.319631] ? sk_reset_timer+0x15/0x70 [18455.319646] ? tcp_schedule_loss_probe+0x1b2/0x240 [18455.319663] ? lock_release+0xb2/0x3f0 [18455.319676] ? __release_sock+0x8a/0x1b0 [18455.319690] ? lock_downgrade+0x3a0/0x3a0 [18455.319704] ? lock_release+0x3f0/0x3f0 [18455.319717] ? __tcp_close+0x2c6/0x790 [18455.319736] ? tcp_v4_do_rcv+0x168/0x370 [18455.319750] tcp_v4_do_rcv+0x168/0x370 [18455.319767] __release_sock+0xbc/0x1b0 [18455.319785] __tcp_close+0x2ee/0x790 [18455.319805] tcp_close+0x20/0x80 This currently happens because on redirect case we do skb_set_owner_r() with the original sock. This increments the fwd_alloc memory accounting on the original sock. Then on redirect we may push this into the queue of the psock we are redirecting to. When the skb is flushed from the queue we give the memory back to the original sock. The problem is if the original sock is destroyed/closed with skbs on another psocks queue then the original sock will not have a way to reclaim the memory before being destroyed. Then above warning will be thrown sockA sockB sk_psock_strp_read() sk_psock_verdict_apply() -- SK_REDIRECT -- sk_psock_skb_redirect() skb_queue_tail(psock_other->ingress_skb..) sk_close() sock_map_unref() sk_psock_put() sk_psock_drop() sk_psock_zap_ingress() At this point we have torn down our own psock, but have the outstanding skb in psock_other. Note that SK_PASS doesn't have this problem because the sk_psock_drop() logic releases the skb, its still associated with our psock. To resolve lets only account for sockets on the ingress queue that are still associated with the current socket. On the redirect case we will check memory limits per 6fa9201a89898, but will omit fwd_alloc accounting until skb is actually enqueued. When the skb is sent via skb_send_sock_locked or received with sk_psock_skb_ingress memory will be claimed on psock_other. Reported-by: Andrii Nakryiko Fixes: 6fa9201a89898 ("bpf, sockmap: Avoid returning unneeded EAGAIN when redirecting to self") Signed-off-by: John Fastabend --- net/core/skmsg.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/net/core/skmsg.c b/net/core/skmsg.c index 1261512d6807..f150b5b63561 100644 --- a/net/core/skmsg.c +++ b/net/core/skmsg.c @@ -488,6 +488,7 @@ static int sk_psock_skb_ingress_self(struct sk_psock *psock, struct sk_buff *skb if (unlikely(!msg)) return -EAGAIN; sk_msg_init(msg); + skb_set_owner_r(skb, sk); return sk_psock_skb_ingress_enqueue(skb, psock, sk, msg); } @@ -790,7 +791,6 @@ static void sk_psock_tls_verdict_apply(struct sk_buff *skb, struct sock *sk, int { switch (verdict) { case __SK_REDIRECT: - skb_set_owner_r(skb, sk); sk_psock_skb_redirect(skb); break; case __SK_PASS: @@ -808,10 +808,6 @@ int sk_psock_tls_strp_read(struct sk_psock *psock, struct sk_buff *skb) rcu_read_lock(); prog = READ_ONCE(psock->progs.skb_verdict); if (likely(prog)) { - /* We skip full set_owner_r here because if we do a SK_PASS - * or SK_DROP we can skip skb memory accounting and use the - * TLS context. - */ skb->sk = psock->sk; tcp_skb_bpf_redirect_clear(skb); ret = sk_psock_bpf_run(psock, prog, skb); @@ -880,12 +876,13 @@ static void sk_psock_strp_read(struct strparser *strp, struct sk_buff *skb) kfree_skb(skb); goto out; } - skb_set_owner_r(skb, sk); prog = READ_ONCE(psock->progs.skb_verdict); if (likely(prog)) { + skb->sk = psock->sk; tcp_skb_bpf_redirect_clear(skb); ret = sk_psock_bpf_run(psock, prog, skb); ret = sk_psock_map_verd(ret, tcp_skb_bpf_redirect_fetch(skb)); + skb->sk = NULL; } sk_psock_verdict_apply(psock, skb, ret); out: @@ -956,12 +953,14 @@ static int sk_psock_verdict_recv(read_descriptor_t *desc, struct sk_buff *skb, kfree_skb(skb); goto out; } - skb_set_owner_r(skb, sk); prog = READ_ONCE(psock->progs.skb_verdict); if (likely(prog)) { + skb_orphan(skb); + skb->sk = sk; tcp_skb_bpf_redirect_clear(skb); ret = sk_psock_bpf_run(psock, prog, skb); ret = sk_psock_map_verd(ret, tcp_skb_bpf_redirect_fetch(skb)); + skb->sk = NULL; } sk_psock_verdict_apply(psock, skb, ret); out: