From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 629C3C43334 for ; Wed, 6 Jul 2022 05:24:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231528AbiGFFYb (ORCPT ); Wed, 6 Jul 2022 01:24:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48654 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231169AbiGFFY3 (ORCPT ); Wed, 6 Jul 2022 01:24:29 -0400 Received: from smtp-fw-33001.amazon.com (smtp-fw-33001.amazon.com [207.171.190.10]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 74F81DFA3; Tue, 5 Jul 2022 22:24:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1657085069; x=1688621069; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=+cH8pDBZl8/HQwEHXwH86DKS0pMpJjRpbkVZtbXxfPs=; b=R7J3cmSv2ET+N3wEa6BZoooVsc3Q3HvFBpJRIXtPIgfYkqyz8h03hhrn rqEnU4/i7DJd18TavtuEFldFAZqVFWiYY3ad7W9Eqelmc/dWNQi6zK5L6 maspq7QND53p/m8UuwqX3+/g/WmV1QJA7nYayH7FhpstJbU3Hn1gvdHfQ k=; X-IronPort-AV: E=Sophos;i="5.92,248,1650931200"; d="scan'208";a="207627504" Received: from iad12-co-svc-p1-lb1-vlan2.amazon.com (HELO email-inbound-relay-pdx-2c-5c4a15b1.us-west-2.amazon.com) ([10.43.8.2]) by smtp-border-fw-33001.sea14.amazon.com with ESMTP; 06 Jul 2022 05:24:27 +0000 Received: from EX13MTAUWB001.ant.amazon.com (pdx1-ws-svc-p6-lb9-vlan2.pdx.amazon.com [10.236.137.194]) by email-inbound-relay-pdx-2c-5c4a15b1.us-west-2.amazon.com (Postfix) with ESMTPS id 6A12E43CD4; Wed, 6 Jul 2022 05:24:25 +0000 (UTC) Received: from EX19D004ANA001.ant.amazon.com (10.37.240.138) by EX13MTAUWB001.ant.amazon.com (10.43.161.207) with Microsoft SMTP Server (TLS) id 15.0.1497.36; Wed, 6 Jul 2022 05:24:24 +0000 Received: from 88665a182662.ant.amazon.com (10.43.162.55) by EX19D004ANA001.ant.amazon.com (10.37.240.138) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1118.9; Wed, 6 Jul 2022 05:24:22 +0000 From: Kuniyuki Iwashima To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Luis Chamberlain , Kees Cook , Iurii Zaikin CC: Kuniyuki Iwashima , Kuniyuki Iwashima , , , Satoru Moriya , "Steven Rostedt" Subject: [PATCH v1 net 11/16] net: Fix a data-race around sysctl_mem. Date: Tue, 5 Jul 2022 22:21:25 -0700 Message-ID: <20220706052130.16368-12-kuniyu@amazon.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220706052130.16368-1-kuniyu@amazon.com> References: <20220706052130.16368-1-kuniyu@amazon.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.43.162.55] X-ClientProxiedBy: EX13D18UWA004.ant.amazon.com (10.43.160.45) To EX19D004ANA001.ant.amazon.com (10.37.240.138) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org While reading .sysctl_mem, it can be changed concurrently. So, we need to add READ_ONCE(). Then we can set proc_doulongvec_minmax_lockless() as the handler to mark it safe. Fixes: 3847ce32aea9 ("core: add tracepoints for queueing skb to rcvbuf") Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Kuniyuki Iwashima --- CC: Satoru Moriya CC: Steven Rostedt --- include/net/sock.h | 2 +- include/trace/events/sock.h | 6 +++--- net/decnet/sysctl_net_decnet.c | 2 +- net/ipv4/sysctl_net_ipv4.c | 4 ++-- net/sctp/sysctl.c | 2 +- 5 files changed, 8 insertions(+), 8 deletions(-) diff --git a/include/net/sock.h b/include/net/sock.h index 72ca97ccb460..9fa54762e077 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -1529,7 +1529,7 @@ void __sk_mem_reclaim(struct sock *sk, int amount); /* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */ static inline long sk_prot_mem_limits(const struct sock *sk, int index) { - long val = sk->sk_prot->sysctl_mem[index]; + long val = READ_ONCE(sk->sk_prot->sysctl_mem[index]); #if PAGE_SIZE > SK_MEM_QUANTUM val <<= PAGE_SHIFT - SK_MEM_QUANTUM_SHIFT; diff --git a/include/trace/events/sock.h b/include/trace/events/sock.h index 12c315782766..3c36c2812782 100644 --- a/include/trace/events/sock.h +++ b/include/trace/events/sock.h @@ -122,9 +122,9 @@ TRACE_EVENT(sock_exceed_buf_limit, TP_printk("proto:%s sysctl_mem=%ld,%ld,%ld allocated=%ld sysctl_rmem=%d rmem_alloc=%d sysctl_wmem=%d wmem_alloc=%d wmem_queued=%d kind=%s", __entry->name, - __entry->sysctl_mem[0], - __entry->sysctl_mem[1], - __entry->sysctl_mem[2], + READ_ONCE(__entry->sysctl_mem[0]), + READ_ONCE(__entry->sysctl_mem[1]), + READ_ONCE(__entry->sysctl_mem[2]), __entry->allocated, __entry->sysctl_rmem, __entry->rmem_alloc, diff --git a/net/decnet/sysctl_net_decnet.c b/net/decnet/sysctl_net_decnet.c index 67b5ab2657b7..e7e658f1ba67 100644 --- a/net/decnet/sysctl_net_decnet.c +++ b/net/decnet/sysctl_net_decnet.c @@ -315,7 +315,7 @@ static struct ctl_table dn_table[] = { .data = &sysctl_decnet_mem, .maxlen = sizeof(sysctl_decnet_mem), .mode = 0644, - .proc_handler = proc_doulongvec_minmax + .proc_handler = proc_doulongvec_minmax_lockless, }, { .procname = "decnet_rmem", diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index eea11218a663..b14931ca5c85 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -504,7 +504,7 @@ static struct ctl_table ipv4_table[] = { .maxlen = sizeof(sysctl_tcp_mem), .data = &sysctl_tcp_mem, .mode = 0644, - .proc_handler = proc_doulongvec_minmax, + .proc_handler = proc_doulongvec_minmax_lockless, }, { .procname = "tcp_low_latency", @@ -570,7 +570,7 @@ static struct ctl_table ipv4_table[] = { .data = &sysctl_udp_mem, .maxlen = sizeof(sysctl_udp_mem), .mode = 0644, - .proc_handler = proc_doulongvec_minmax, + .proc_handler = proc_doulongvec_minmax_lockless, }, { .procname = "fib_sync_mem", diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c index b46a416787ec..fa79bf4059d1 100644 --- a/net/sctp/sysctl.c +++ b/net/sctp/sysctl.c @@ -64,7 +64,7 @@ static struct ctl_table sctp_table[] = { .data = &sysctl_sctp_mem, .maxlen = sizeof(sysctl_sctp_mem), .mode = 0644, - .proc_handler = proc_doulongvec_minmax + .proc_handler = proc_doulongvec_minmax_lockless, }, { .procname = "sctp_rmem", -- 2.30.2