| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <4E49057A4198779C+Zged+hXhxE4GksiL@centos8>
Date: Sat, 30 Mar 2024 13:07:06 +0800
From: Dawei Li <dawei.li@...ngroup.cn>
To: Eric Dumazet <edumazet@...gle.com>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
<ioana.ciornei@....com>, <wintera@...ux.ibm.com>, <twinkler@...ux.ibm.com>,
<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-s390@...r.kernel.org>
Subject: Re: [PATCH net-next 1/2] net/iucv: Avoid explicit cpumask var
allocation on stack
Hi Eric,
On Fri, Mar 29, 2024 at 02:21:28PM +0100, Eric Dumazet wrote:
> On Fri, Mar 29, 2024 at 11:57 AM Dawei Li <dawei.li@...ngroup.cn> wrote:
> >
> > For CONFIG_CPUMASK_OFFSTACK=y kernel, explicit allocation of cpumask
> > variable on stack is not recommended since it can cause potential stack
> > overflow.
> >
> > Instead, kernel code should always use *cpumask_var API(s) to allocate
> > cpumask var in config-neutral way, leaving allocation strategy to
> > CONFIG_CPUMASK_OFFSTACK.
> >
> > Use *cpumask_var API(s) to address it.
> >
> > Signed-off-by: Dawei Li <dawei.li@...ngroup.cn>
> > ---
> > net/iucv/iucv.c | 37 ++++++++++++++++++++++++++-----------
> > 1 file changed, 26 insertions(+), 11 deletions(-)
> >
> > diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
> > index a4ab615ca3e3..b51f46ec32f9 100644
> > --- a/net/iucv/iucv.c
> > +++ b/net/iucv/iucv.c
> > @@ -520,14 +520,19 @@ static void iucv_setmask_mp(void)
> > */
> > static void iucv_setmask_up(void)
> > {
> > - cpumask_t cpumask;
> > + cpumask_var_t cpumask;
> > int cpu;
> >
> > + if (!alloc_cpumask_var(&cpumask, GFP_KERNEL))
> > + return;
>
> This can not be right. iucv_setmask_up() is not supposed to fail.
>
> Since iucv_setmask_up() is only called with iucv_register_mutex held,
> you could simply add a 'static' for @cpumask variable.
Correct, iucv_register_mutex is a global lock and can serialize access
on static cpumask var.
I will respin V2 as you suggested.
Thanks,
Dawei
>
>
>
> > +
> > /* Disable all cpu but the first in cpu_irq_cpumask. */
> > - cpumask_copy(&cpumask, &iucv_irq_cpumask);
> > - cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
> > - for_each_cpu(cpu, &cpumask)
> > + cpumask_copy(cpumask, &iucv_irq_cpumask);
> > + cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), cpumask);
> > + for_each_cpu(cpu, cpumask)
> > smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
> > +
> > + free_cpumask_var(cpumask);
> > }
>
X-sender: <linux-kernel+bounces-125600-steffen.klassert=secunet.com@...r.kernel.org>
X-Receiver: <steffen.klassert@...unet.com> ORCPT=rfc822;steffen.klassert@...unet.com; X-ExtendedProps=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
X-CreatedBy: MSExchange15
X-HeloDomain: b.mx.secunet.com
X-ExtendedProps: 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
X-Source: SMTP:Default MBX-ESSEN-02
X-SourceIPAddress: 62.96.220.37
X-EndOfInjectedXHeaders: 14423
Received: from cas-essen-02.secunet.de (10.53.40.202) by
mbx-essen-02.secunet.de (10.53.40.198) with Microsoft SMTP Server
(version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id
15.1.2507.37; Sat, 30 Mar 2024 06:09:31 +0100
Received: from b.mx.secunet.com (62.96.220.37) by cas-essen-02.secunet.de
(10.53.40.202) with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35 via Frontend
Transport; Sat, 30 Mar 2024 06:09:31 +0100
Received: from localhost (localhost [127.0.0.1])
by b.mx.secunet.com (Postfix) with ESMTP id 9BC5E20315
for <steffen.klassert@...unet.com>; Sat, 30 Mar 2024 06:09:31 +0100 (CET)
X-Virus-Scanned: by secunet
X-Spam-Flag: NO
X-Spam-Score: -2.651
X-Spam-Level:
X-Spam-Status: No, score=-2.651 tagged_above=-999 required=2.1
tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249,
MAILING_LIST_MULTI=-1, RCVD_IN_DNSWL_NONE=-0.0001,
SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Received: from b.mx.secunet.com ([127.0.0.1])
by localhost (a.mx.secunet.com [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id LZTttGtnumXn for <steffen.klassert@...unet.com>;
Sat, 30 Mar 2024 06:09:28 +0100 (CET)
Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=147.75.48.161; helo=sy.mirrors.kernel.org; envelope-from=linux-kernel+bounces-125600-steffen.klassert=secunet.com@...r.kernel.org; receiver=steffen.klassert@...unet.com
DKIM-Filter: OpenDKIM Filter v2.11.0 b.mx.secunet.com 6416D202A6
Received: from sy.mirrors.kernel.org (sy.mirrors.kernel.org [147.75.48.161])
(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by b.mx.secunet.com (Postfix) with ESMTPS id 6416D202A6
for <steffen.klassert@...unet.com>; Sat, 30 Mar 2024 06:09:27 +0100 (CET)
Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140])
(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by sy.mirrors.kernel.org (Postfix) with ESMTPS id 385FAB217BA
for <steffen.klassert@...unet.com>; Sat, 30 Mar 2024 05:09:23 +0000 (UTC)
Received: from localhost.localdomain (localhost.localdomain [127.0.0.1])
by smtp.subspace.kernel.org (Postfix) with ESMTP id D66ECBA28;
Sat, 30 Mar 2024 05:09:06 +0000 (UTC)
Received: from bg1.exmail.qq.com (bg1.exmail.qq.com [114.132.65.219])
(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by smtp.subspace.kernel.org (Postfix) with ESMTPS id 418523FF1;
Sat, 30 Mar 2024 05:08:58 +0000 (UTC)
Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.132.65.219
ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;
t=1711775345; cv=none; b=gfLWY1ioFi9jl1ZBFjmxmFW2tHmdP96al/rViDheOnyYsGPNiY/6rojsa6KuCViu6ospo8JqIPmrQ5kYhXxI4fWTd13oBUM7loEJ816ctuoV5AIOJRDqdy8LJMFGF588bEGNcNoJZnlMJ+26z+gcXZ2kaQlCf0QR+U0nKFsVYlw=
ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org;
s=arc-20240116; t=1711775345; c=relaxed/simple;
bh=nYsJpAvl6D6Ldufd73Rjy7YF1XYSzElH1fykgREgPxY=;
h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version:
Content-Type:Content-Disposition:In-Reply-To; b=nPDDajRC5sef6WYcCenUzFrJabkj3nFiAaNM8jxBguQE+fYD0jUXLYNwIYYdx/DfR8ex7tUilcegtdOsom4YdWhROAmwHDAxg4AfPonb2M1mMwD3xYUyVNldguOl29V8JvaRRyAAWjRH+cUhqKQq6qdlYHWWn1MFfLqI2qghuRo=
ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=shingroup.cn; spf=pass smtp.mailfrom=shingroup.cn; arc=none smtp.client-ip=114.132.65.219
Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=shingroup.cn
Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=shingroup.cn
X-QQ-mid: bizesmtpsz13t1711775229tdi4p2
X-QQ-Originating-IP: RfTYRleHqifmaUL5vg3HHBAADHtyt3J2efZxDgCsTa0=
Received: from localhost ( [112.0.147.175])
by bizesmtp.qq.com (ESMTP) with
id ; Sat, 30 Mar 2024 13:07:07 +0800 (CST)
X-QQ-SSF: 01400000000000704000000A0000000
X-QQ-FEAT: OtIeQkg1QQHVkELNGhnn3Ao/OxN3u837g2WY2miXs+dKwNICeHodGDXYI+XIN
MLiksvoY6OK484p/H1Pd7HcbM0rICeev22amIC6/BI2BPXdj7hZR/NjRgIzO0ujc7AJYyuh
hSs4kN6XesHATJzk7YtHOv0oscVKSJDG1YcCID61KeNwB//v/SP6Vco5Zi0zVzK2CryiHy7
MDlcbxtiVcvQbWgHR9uJniyBUgkXuWUpSRm9PGge+rsWbj+CoXH7KA5p92J+1tMYPfc3pMS
a2+D1HW1CQDyFXgH/iGbdQU2wmJ3Udzd7Q8BgYnuoVkISFF2Z3cH4G9BqZDzzOAp62v8M7U
2sZsZTz6rWN4NWIO+LXnMPEd2Ftx/MDN8OxPXGUXp3ZrWXMIP1dg4Nut1Jfsg==
X-QQ-GoodBg: 2
X-BIZMAIL-ID: 10889329762490604258
Date: Sat, 30 Mar 2024 13:07:06 +0800
From: Dawei Li <dawei.li@...ngroup.cn>
To: Eric Dumazet <edumazet@...gle.com>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
<ioana.ciornei@....com>, <wintera@...ux.ibm.com>, <twinkler@...ux.ibm.com>,
<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-s390@...r.kernel.org>
Subject: Re: [PATCH net-next 1/2] net/iucv: Avoid explicit cpumask var
allocation on stack
Message-ID: <4E49057A4198779C+Zged+hXhxE4GksiL@...tos8>
References: <20240329105610.922675-1-dawei.li@...ngroup.cn>
<20240329105610.922675-2-dawei.li@...ngroup.cn>
<CANn89iJzuw8_ti4P4tJ_A3Fd0QCjHTBjasbm_J3N8up=gK8Aow@...l.gmail.com>
Precedence: bulk
X-Mailing-List: linux-kernel@...r.kernel.org
List-Id: <linux-kernel.vger.kernel.org>
List-Subscribe: <mailto:linux-kernel+subscribe@...r.kernel.org>
List-Unsubscribe: <mailto:linux-kernel+unsubscribe@...r.kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <CANn89iJzuw8_ti4P4tJ_A3Fd0QCjHTBjasbm_J3N8up=gK8Aow@...l.gmail.com>
X-QQ-SENDSIZE: 520
Feedback-ID: bizesmtpsz:shingroup.cn:qybglogicsvrgz:qybglogicsvrgz5a-1
Return-Path: linux-kernel+bounces-125600-steffen.klassert=secunet.com@...r.kernel.org
X-MS-Exchange-Organization-OriginalArrivalTime: 30 Mar 2024 05:09:31.6783
(UTC)
X-MS-Exchange-Organization-Network-Message-Id: c5b01700-de57-4caa-0991-08dc5077955a
X-MS-Exchange-Organization-OriginalClientIPAddress: 62.96.220.37
X-MS-Exchange-Organization-OriginalServerIPAddress: 10.53.40.202
X-MS-Exchange-Organization-Cross-Premises-Headers-Processed: cas-essen-02.secunet.de
X-MS-Exchange-Organization-OrderedPrecisionLatencyInProgress: LSRV=mbx-essen-02.secunet.de:TOTAL-HUB=11373.685|SMR=0.135(SMRDE=0.003|SMRC=0.131(SMRCL=0.101|X-SMRCR=0.131))|CAT=0.064(CATMS=0.001
|CATOS=0.001|CATRESL=0.026(CATRESLP2R=0.021)|CATORES=0.034(CATRS=0.034(CATRS-Index
Routing Agent=0.032
)))|QDM=11368.155|UNK=0.002|CAT=0.004(CATRESL=0.003(CATRESLP2R=0001))|QDM=5.384|CAT=0.024
(CATRESL=0.023(CATRESLP2R=0.019));2024-03-30T08:19:05.371Z
X-MS-Exchange-Forest-ArrivalHubServer: mbx-essen-02.secunet.de
X-MS-Exchange-Organization-AuthSource: cas-essen-02.secunet.de
X-MS-Exchange-Organization-AuthAs: Anonymous
X-MS-Exchange-Organization-FromEntityHeader: Internet
X-MS-Exchange-Organization-OriginalSize: 8519
X-MS-Exchange-Organization-HygienePolicy: Standard
X-MS-Exchange-Organization-MessageLatency: SRV=cas-essen-02.secunet.de:TOTAL-FE=0.009|SMR=0.008(SMRPI=0.006(SMRPI-FrontendProxyAgent=0.006))
X-MS-Exchange-Organization-Recipient-Limit-Verified: True
X-MS-Exchange-Organization-TotalRecipientCount: 1
X-MS-Exchange-Organization-Rules-Execution-History: 0b0cf904-14ac-4724-8bdf-482ee6223cf2%%%fd34672d-751c-45ae-a963-ed177fcabe23%%%d8080257-b0c3-47b4-b0db-23bc0c8ddb3c%%%95e591a2-5d7d-4afa-b1d0-7573d6c0a5d9%%%f7d0f6bc-4dcc-4876-8c5d-b3d6ddbb3d55%%%16355082-c50b-4214-9c7d-d39575f9f79b
X-MS-Exchange-Forest-RulesExecuted: mbx-essen-02
X-MS-Exchange-Organization-RulesExecuted: mbx-essen-02
X-MS-Exchange-Forest-IndexAgent-0: AQ0CZW4AAYQFAAAPAAADH4sIAAAAAAAEAJVV63LTRhQ+sq2LndjAQA
mdzjCnf8AmthM7F0pomWQCoRkSyDTQvx5ZWtk7kSVXlwTTdqZv1Jfp
E/RJenbXCrIdl0GjKGd3z/nOd27rf27/zPFVxJ1mtVKtvAvwKOJNPL
Uj7D5rYnezu412gpvdvW5nr/vD2Smub3Y2N5vSBF+mI/sTS/AqChO2
V628wGUAnc7eztN///r74BRf2leM4wnHH10htX2+Hw95MIjCdNx2gh
c5tBfyg0dhhIfv3h4dv+4dnn04PTh/03t3dHT+/uDwzU8TvGBRwPwm
so9jnzs8Qdv3Q8dOeBhg6KEzJpLxhUK6tCNu932GdBYntnOBPMYgTD
BiTjgascBlLsY8cBgSkGMH9JfGDMfEKEi47SsrBRZessjzw6t2jupx
ECfMdptTVuiELsN4GKa+S7yu7EmMAu/JlFWPCOHB2XE9bmASZsyZwp
rqCNLIiUkYeHzQCliaRESEsJroM/uSUpcPOabThA0mhKdglmQuz/rD
/1By3YjFMaUjb3DOBwFzW6HntfqTvS+WVBm1Wi0lYMCSDZ46l/LTdv
AP3HqK60uf1udnCtBBj1MVnaEdDBhlu7tLGYpZJDIQ19cbTWo4dJnP
1EarkePucs8jLgPRKRvzTPrzO8qGU2N8RHvb7u92dhx7i2212/2djr
e9y5ytrvcMaSZ2t7ev41xEVkcUzDIX+/vY2uluNjvbuC7/PxNb1G4J
DdplyF0U2r2YJbJKo3FdbDamCcEnG1NpqUU6a/H7lCyqJ6t+kknPp4
znzqk7FnSyhwfy5Hku2Zk597D+vezSXg6p/mi6aOLro7Pem1e/vH11
0mjMmmZPxJI0CgS4OH8/pMkVAyqmt88w4oNh0l6IuJENeJyOx2FM00
097dncb09xztWw32QWBv6EXPg+WV3xZKi0IjbgNONRb5Qm1BND5rtN
ATQJUxpRMecxH43JkiYHbXys6vEYPbrE9nMjLe+htrh0D8OIrp+keS
M+8bBx4Id9GnnK3gXagSvjpm6n+4h/Ymg7Dk1otaLuNFH8nBvp4Zj4
+z5lMB7TRfJrF+1Y8o3TwYCRM1dqvadpuojl74DItxxqlaVprqgmsw
XfeIIveSwvVEqTcIv9NMFkyGg+oziR19Y47fHot6zs7etOne88JxxP
cg3xSGYjZ9l4vsSOLsFIKNWzHem7vghAoEuwqDg9ZjvDDCanefMYSL
Jf5rpg9hVcl0AtUp1lOv/Eo3FPNHHPSwNHXIc9+n0b+EzZSr990Vg9
uX774eSELs9rp3O+I8Zm5neOI/4pO6VaAShAsQRl+hZBL2qwSi+UCl
AqgV7QipYGFtBrkawD6GDSvgmWDpWlJkK/rINBO7oG3wihWBb6JR3u
FKFkaLAGJoGQmgYFQwoVWCE1E6qWJCPNCb+0AqvXMgmEo8OKBfdMKB
uSDH3pJSamBitgkRq9GhTJxIKaKXdIJqc16bQo+VcECDmycmTu3QhC
RwWokVpVeCnJKBZDu1uU4dOraaQDBW1DA6DoRLq0ckHmuaLdUkIZ1k
oSjRQ+G5LRzNIkR6tQW9WqBoABt2dPV2aWWqUEBKdL18XPMhgqS+Tp
lgxclvv+TZvfUexloIIXTLhvingtxZCWMiFrBdDJ8R0wsjSWqfoVKi
g8NKBGgCpvsnxmDlxX5VOVLcmCzp2qOipKd0FX/UNtqYpuTHNVNLLy
WVAl73llApG9ZF7ToLoYMjRjWndLlYOWBVlZqVMz4JYOj8ys6Oqdtp
wgKZYmfGuKJrdKIvYK+b0tvZiwZoqE0DgYYimTpmLPFFZIpygHJCNm
qPRKNP0r0SoLaITwkHYeyB1LDkVRprFGxRI4JBuyFR8oHBWp+R+FXZ
sNTwwAAAEK8QE8P3htbCB2ZXJzaW9uPSIxLjAiIGVuY29kaW5nPSJ1
dGYtMTYiPz4NCjxFbWFpbFNldD4NCiAgPFZlcnNpb24+MTUuMC4wLj
A8L1ZlcnNpb24+DQogIDxFbWFpbHM+DQogICAgPEVtYWlsIFN0YXJ0
SW5kZXg9IjEyMCIgUG9zaXRpb249IlNpZ25hdHVyZSI+DQogICAgIC
A8RW1haWxTdHJpbmc+ZGF3ZWkubGlAc2hpbmdyb3VwLmNuPC9FbWFp
bFN0cmluZz4NCiAgICA8L0VtYWlsPg0KICA8L0VtYWlscz4NCjwvRW
1haWxTZXQ+AQzUBzw/eG1sIHZlcnNpb249IjEuMCIgZW5jb2Rpbmc9
InV0Zi0xNiI/Pg0KPENvbnRhY3RTZXQ+DQogIDxWZXJzaW9uPjE1Lj
AuMC4wPC9WZXJzaW9uPg0KICA8Q29udGFjdHM+DQogICAgPENvbnRh
Y3QgU3RhcnRJbmRleD0iMTEwIiBQb3NpdGlvbj0iU2lnbmF0dXJlIj
4NCiAgICAgIDxQZXJzb24gU3RhcnRJbmRleD0iMTEwIiBQb3NpdGlv
bj0iU2lnbmF0dXJlIj4NCiAgICAgICAgPFBlcnNvblN0cmluZz5EYX
dlaSBMaTwvUGVyc29uU3RyaW5nPg0KICAgICAgPC9QZXJzb24+DQog
ICAgICA8RW1haWxzPg0KICAgICAgICA8RW1haWwgU3RhcnRJbmRleD
0iMTIwIiBQb3NpdGlvbj0iU2lnbmF0dXJlIj4NCiAgICAgICAgICA8
RW1haWxTdHJpbmc+ZGF3ZWkubGlAc2hpbmdyb3VwLmNuPC9FbWFpbF
N0cmluZz4NCiAgICAgICAgPC9FbWFpbD4NCiAgICAgIDwvRW1haWxz
Pg0KICAgICAgPENvbnRhY3RTdHJpbmc+RGF3ZWkgTGkgJmx0O2Rhd2
VpLmxpQHNoaW5ncm91cC5jbjwvQ29udGFjdFN0cmluZz4NCiAgICA8
L0NvbnRhY3Q+DQogICAgPENvbnRhY3QgU3RhcnRJbmRleD0iNTc3Ii
BQb3NpdGlvbj0iU2lnbmF0dXJlIj4NCiAgICAgIDxQZXJzb24gU3Rh
cnRJbmRleD0iNTc3IiBQb3NpdGlvbj0iU2lnbmF0dXJlIj4NCiAgIC
AgICAgPFBlcnNvblN0cmluZz5EYXdlaSBMaTwvUGVyc29uU3RyaW5n
Pg0KICAgICAgPC9QZXJzb24+DQogICAgICA8RW1haWxzPg0KICAgIC
AgICA8RW1haWwgU3RhcnRJbmRleD0iNTg3IiBQb3NpdGlvbj0iU2ln
bmF0dXJlIj4NCiAgICAgICAgICA8RW1haWxTdHJpbmc+ZGF3ZWkubG
lAc2hpbmdyb3VwLmNuPC9FbWFpbFN0cmluZz4NCiAgICAgICAgPC9F
bWFpbD4NCiAgICAgIDwvRW1haWxzPg0KICAgICAgPENvbnRhY3RTdH
Jpbmc+RGF3ZWkgTGkgJmx0O2Rhd2VpLmxpQHNoaW5ncm91cC5jbjwv
Q29udGFjdFN0cmluZz4NCiAgICA8L0NvbnRhY3Q+DQogIDwvQ29udG
FjdHM+DQo8L0NvbnRhY3RTZXQ+AQ7PAVJldHJpZXZlck9wZXJhdG9y
LDEwLDE7UmV0cmlldmVyT3BlcmF0b3IsMTEsMTtQb3N0RG9jUGFyc2
VyT3BlcmF0b3IsMTAsMDtQb3N0RG9jUGFyc2VyT3BlcmF0b3IsMTEs
MDtQb3N0V29yZEJyZWFrZXJEaWFnbm9zdGljT3BlcmF0b3IsMTAsMT
tQb3N0V29yZEJyZWFrZXJEaWFnbm9zdGljT3BlcmF0b3IsMTEsMDtU
cmFuc3BvcnRXcml0ZXJQcm9kdWNlciwyMCwyMQ==
X-MS-Exchange-Forest-IndexAgent: 1 2863
X-MS-Exchange-Forest-EmailMessageHash: 0EC3E35F
X-MS-Exchange-Forest-Language: en
X-MS-Exchange-Organization-Processed-By-Journaling: Journal Agent
X-MS-Exchange-Organization-Transport-Properties: DeliveryPriority=Low
X-MS-Exchange-Organization-Prioritization: 2:RC:REDACTED-af51df60fd698f80b064826f9ee192ca@...unet.com:55/10|SR
X-MS-Exchange-Organization-IncludeInSla: False:RecipientCountThresholdExceeded
Hi Eric,
On Fri, Mar 29, 2024 at 02:21:28PM +0100, Eric Dumazet wrote:
> On Fri, Mar 29, 2024 at 11:57 AM Dawei Li <dawei.li@...ngroup.cn> wrote:
> >
> > For CONFIG_CPUMASK_OFFSTACK=y kernel, explicit allocation of cpumask
> > variable on stack is not recommended since it can cause potential stack
> > overflow.
> >
> > Instead, kernel code should always use *cpumask_var API(s) to allocate
> > cpumask var in config-neutral way, leaving allocation strategy to
> > CONFIG_CPUMASK_OFFSTACK.
> >
> > Use *cpumask_var API(s) to address it.
> >
> > Signed-off-by: Dawei Li <dawei.li@...ngroup.cn>
> > ---
> > net/iucv/iucv.c | 37 ++++++++++++++++++++++++++-----------
> > 1 file changed, 26 insertions(+), 11 deletions(-)
> >
> > diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
> > index a4ab615ca3e3..b51f46ec32f9 100644
> > --- a/net/iucv/iucv.c
> > +++ b/net/iucv/iucv.c
> > @@ -520,14 +520,19 @@ static void iucv_setmask_mp(void)
> > */
> > static void iucv_setmask_up(void)
> > {
> > - cpumask_t cpumask;
> > + cpumask_var_t cpumask;
> > int cpu;
> >
> > + if (!alloc_cpumask_var(&cpumask, GFP_KERNEL))
> > + return;
>
> This can not be right. iucv_setmask_up() is not supposed to fail.
>
> Since iucv_setmask_up() is only called with iucv_register_mutex held,
> you could simply add a 'static' for @cpumask variable.
Correct, iucv_register_mutex is a global lock and can serialize access
on static cpumask var.
I will respin V2 as you suggested.
Thanks,
Dawei
>
>
>
> > +
> > /* Disable all cpu but the first in cpu_irq_cpumask. */
> > - cpumask_copy(&cpumask, &iucv_irq_cpumask);
> > - cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
> > - for_each_cpu(cpu, &cpumask)
> > + cpumask_copy(cpumask, &iucv_irq_cpumask);
> > + cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), cpumask);
> > + for_each_cpu(cpu, cpumask)
> > smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
> > +
> > + free_cpumask_var(cpumask);
> > }
>
X-sender: <netdev+bounces-83494-peter.schumann=secunet.com@...r.kernel.org>
X-Receiver: <peter.schumann@...unet.com> ORCPT=rfc822;peter.schumann@...unet.com
X-CreatedBy: MSExchange15
X-HeloDomain: mbx-dresden-01.secunet.de
X-ExtendedProps: BQBjAAoAL1SmlidQ3AgFADcAAgAADwA8AAAATWljcm9zb2Z0LkV4Y2hhbmdlLlRyYW5zcG9ydC5NYWlsUmVjaXBpZW50Lk9yZ2FuaXphdGlvblNjb3BlEQAAAAAAAAAAAAAAAAAAAAAADwA/AAAATWljcm9zb2Z0LkV4Y2hhbmdlLlRyYW5zcG9ydC5EaXJlY3RvcnlEYXRhLk1haWxEZWxpdmVyeVByaW9yaXR5DwADAAAATG93
X-Source: SMTP:Default MBX-ESSEN-02
X-SourceIPAddress: 10.53.40.199
X-EndOfInjectedXHeaders: 9053
Received: from mbx-dresden-01.secunet.de (10.53.40.199) by
mbx-essen-02.secunet.de (10.53.40.198) with Microsoft SMTP Server
(version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id
15.1.2507.37; Sat, 30 Mar 2024 06:09:14 +0100
Received: from a.mx.secunet.com (62.96.220.36) by cas-essen-01.secunet.de
(10.53.40.201) with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35 via Frontend
Transport; Sat, 30 Mar 2024 06:09:14 +0100
Received: from localhost (localhost [127.0.0.1])
by a.mx.secunet.com (Postfix) with ESMTP id 84828208B8
for <peter.schumann@...unet.com>; Sat, 30 Mar 2024 06:09:14 +0100 (CET)
X-Virus-Scanned: by secunet
X-Spam-Flag: NO
X-Spam-Score: -2.651
X-Spam-Level:
X-Spam-Status: No, score=-2.651 tagged_above=-999 required=2.1
tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249,
MAILING_LIST_MULTI=-1, RCVD_IN_DNSWL_NONE=-0.0001,
SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Received: from a.mx.secunet.com ([127.0.0.1])
by localhost (a.mx.secunet.com [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id YZ3K0bKgR3tk for <peter.schumann@...unet.com>;
Sat, 30 Mar 2024 06:09:10 +0100 (CET)
Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=147.75.80.249; helo=am.mirrors.kernel.org; envelope-from=netdev+bounces-83494-peter.schumann=secunet.com@...r.kernel.org; receiver=peter.schumann@...unet.com
DKIM-Filter: OpenDKIM Filter v2.11.0 a.mx.secunet.com C43A3208B4
Received: from am.mirrors.kernel.org (am.mirrors.kernel.org [147.75.80.249])
(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by a.mx.secunet.com (Postfix) with ESMTPS id C43A3208B4
for <peter.schumann@...unet.com>; Sat, 30 Mar 2024 06:09:10 +0100 (CET)
Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140])
(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by am.mirrors.kernel.org (Postfix) with ESMTPS id 6D1641F22702
for <peter.schumann@...unet.com>; Sat, 30 Mar 2024 05:09:10 +0000 (UTC)
Received: from localhost.localdomain (localhost.localdomain [127.0.0.1])
by smtp.subspace.kernel.org (Postfix) with ESMTP id 9D76C79F0;
Sat, 30 Mar 2024 05:09:05 +0000 (UTC)
X-Original-To: netdev@...r.kernel.org
Received: from bg1.exmail.qq.com (bg1.exmail.qq.com [114.132.65.219])
(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by smtp.subspace.kernel.org (Postfix) with ESMTPS id 418523FF1;
Sat, 30 Mar 2024 05:08:58 +0000 (UTC)
Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.132.65.219
ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;
t=1711775345; cv=none; b=gfLWY1ioFi9jl1ZBFjmxmFW2tHmdP96al/rViDheOnyYsGPNiY/6rojsa6KuCViu6ospo8JqIPmrQ5kYhXxI4fWTd13oBUM7loEJ816ctuoV5AIOJRDqdy8LJMFGF588bEGNcNoJZnlMJ+26z+gcXZ2kaQlCf0QR+U0nKFsVYlw=
ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org;
s=arc-20240116; t=1711775345; c=relaxed/simple;
bh=nYsJpAvl6D6Ldufd73Rjy7YF1XYSzElH1fykgREgPxY=;
h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version:
Content-Type:Content-Disposition:In-Reply-To; b=nPDDajRC5sef6WYcCenUzFrJabkj3nFiAaNM8jxBguQE+fYD0jUXLYNwIYYdx/DfR8ex7tUilcegtdOsom4YdWhROAmwHDAxg4AfPonb2M1mMwD3xYUyVNldguOl29V8JvaRRyAAWjRH+cUhqKQq6qdlYHWWn1MFfLqI2qghuRo=
ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=shingroup.cn; spf=pass smtp.mailfrom=shingroup.cn; arc=none smtp.client-ip=114.132.65.219
Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=shingroup.cn
Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=shingroup.cn
X-QQ-mid: bizesmtpsz13t1711775229tdi4p2
X-QQ-Originating-IP: RfTYRleHqifmaUL5vg3HHBAADHtyt3J2efZxDgCsTa0=
Received: from localhost ( [112.0.147.175])
by bizesmtp.qq.com (ESMTP) with
id ; Sat, 30 Mar 2024 13:07:07 +0800 (CST)
X-QQ-SSF: 01400000000000704000000A0000000
X-QQ-FEAT: OtIeQkg1QQHVkELNGhnn3Ao/OxN3u837g2WY2miXs+dKwNICeHodGDXYI+XIN
MLiksvoY6OK484p/H1Pd7HcbM0rICeev22amIC6/BI2BPXdj7hZR/NjRgIzO0ujc7AJYyuh
hSs4kN6XesHATJzk7YtHOv0oscVKSJDG1YcCID61KeNwB//v/SP6Vco5Zi0zVzK2CryiHy7
MDlcbxtiVcvQbWgHR9uJniyBUgkXuWUpSRm9PGge+rsWbj+CoXH7KA5p92J+1tMYPfc3pMS
a2+D1HW1CQDyFXgH/iGbdQU2wmJ3Udzd7Q8BgYnuoVkISFF2Z3cH4G9BqZDzzOAp62v8M7U
2sZsZTz6rWN4NWIO+LXnMPEd2Ftx/MDN8OxPXGUXp3ZrWXMIP1dg4Nut1Jfsg==
X-QQ-GoodBg: 2
X-BIZMAIL-ID: 10889329762490604258
Date: Sat, 30 Mar 2024 13:07:06 +0800
From: Dawei Li <dawei.li@...ngroup.cn>
To: Eric Dumazet <edumazet@...gle.com>
CC: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
ioana.ciornei@....com, wintera@...ux.ibm.com,
twinkler@...ux.ibm.com, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] net/iucv: Avoid explicit cpumask var
allocation on stack
Message-ID: <4E49057A4198779C+Zged+hXhxE4GksiL@...tos8>
References: <20240329105610.922675-1-dawei.li@...ngroup.cn>
<20240329105610.922675-2-dawei.li@...ngroup.cn>
<CANn89iJzuw8_ti4P4tJ_A3Fd0QCjHTBjasbm_J3N8up=gK8Aow@...l.gmail.com>
Precedence: bulk
X-Mailing-List: netdev@...r.kernel.org
List-Id: <netdev.vger.kernel.org>
List-Subscribe: <mailto:netdev+subscribe@...r.kernel.org>
List-Unsubscribe: <mailto:netdev+unsubscribe@...r.kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <CANn89iJzuw8_ti4P4tJ_A3Fd0QCjHTBjasbm_J3N8up=gK8Aow@...l.gmail.com>
X-QQ-SENDSIZE: 520
Feedback-ID: bizesmtpsz:shingroup.cn:qybglogicsvrgz:qybglogicsvrgz5a-1
Return-Path: netdev+bounces-83494-peter.schumann=secunet.com@...r.kernel.org
X-MS-Exchange-Organization-OriginalArrivalTime: 30 Mar 2024 05:09:14.5645
(UTC)
X-MS-Exchange-Organization-Network-Message-Id: 30801339-1396-408f-853e-08dc50778b26
X-MS-Exchange-Organization-OriginalClientIPAddress: 62.96.220.36
X-MS-Exchange-Organization-OriginalServerIPAddress: 10.53.40.201
X-MS-Exchange-Organization-Cross-Premises-Headers-Processed: cas-essen-01.secunet.de
X-MS-Exchange-Organization-OrderedPrecisionLatencyInProgress: LSRV=cas-essen-01.secunet.de:TOTAL-FE=0.005|SMR=0.004(SMRPI=0.003(SMRPI-FrontendProxyAgent=0.003));2024-03-30T05:09:14.569Z
X-MS-Exchange-Forest-ArrivalHubServer: mbx-essen-02.secunet.de
X-MS-Exchange-Organization-AuthSource: cas-essen-01.secunet.de
X-MS-Exchange-Organization-AuthAs: Anonymous
X-MS-Exchange-Organization-OriginalSize: 8505
X-MS-Exchange-Organization-Transport-Properties: DeliveryPriority=Low
X-MS-Exchange-Organization-Prioritization: 2:ShadowRedundancy
X-MS-Exchange-Organization-IncludeInSla: False:ShadowRedundancy
Hi Eric,
On Fri, Mar 29, 2024 at 02:21:28PM +0100, Eric Dumazet wrote:
> On Fri, Mar 29, 2024 at 11:57 AM Dawei Li <dawei.li@...ngroup.cn> wrote:
> >
> > For CONFIG_CPUMASK_OFFSTACK=y kernel, explicit allocation of cpumask
> > variable on stack is not recommended since it can cause potential stack
> > overflow.
> >
> > Instead, kernel code should always use *cpumask_var API(s) to allocate
> > cpumask var in config-neutral way, leaving allocation strategy to
> > CONFIG_CPUMASK_OFFSTACK.
> >
> > Use *cpumask_var API(s) to address it.
> >
> > Signed-off-by: Dawei Li <dawei.li@...ngroup.cn>
> > ---
> > net/iucv/iucv.c | 37 ++++++++++++++++++++++++++-----------
> > 1 file changed, 26 insertions(+), 11 deletions(-)
> >
> > diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
> > index a4ab615ca3e3..b51f46ec32f9 100644
> > --- a/net/iucv/iucv.c
> > +++ b/net/iucv/iucv.c
> > @@ -520,14 +520,19 @@ static void iucv_setmask_mp(void)
> > */
> > static void iucv_setmask_up(void)
> > {
> > - cpumask_t cpumask;
> > + cpumask_var_t cpumask;
> > int cpu;
> >
> > + if (!alloc_cpumask_var(&cpumask, GFP_KERNEL))
> > + return;
>
> This can not be right. iucv_setmask_up() is not supposed to fail.
>
> Since iucv_setmask_up() is only called with iucv_register_mutex held,
> you could simply add a 'static' for @cpumask variable.
Correct, iucv_register_mutex is a global lock and can serialize access
on static cpumask var.
I will respin V2 as you suggested.
Thanks,
Dawei
>
>
>
> > +
> > /* Disable all cpu but the first in cpu_irq_cpumask. */
> > - cpumask_copy(&cpumask, &iucv_irq_cpumask);
> > - cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
> > - for_each_cpu(cpu, &cpumask)
> > + cpumask_copy(cpumask, &iucv_irq_cpumask);
> > + cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), cpumask);
> > + for_each_cpu(cpu, cpumask)
> > smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
> > +
> > + free_cpumask_var(cpumask);
> > }
>
Powered by blists - more mailing lists