From: Nazarov Sergey <s-nazarov@yandex.ru>
To: David Miller <davem@davemloft.net>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-security-module@vger.kernel.org"
<linux-security-module@vger.kernel.org>,
"kuznet@ms2.inr.ac.ru" <kuznet@ms2.inr.ac.ru>,
"yoshfuji@linux-ipv6.org" <yoshfuji@linux-ipv6.org>,
"paul@paul-moore.com" <paul@paul-moore.com>
Subject: Re: [PATCH] NETWORKING: avoid use IPCB in cipso_v4_error
Date: Thu, 14 Feb 2019 21:14:03 +0300 [thread overview]
Message-ID: <372221550168043@iva6-7bf5cb2fcad9.qloud-c.yandex.net> (raw)
In-Reply-To: <20190214.084343.1138362153341500718.davem@davemloft.net>
Now the problem comes from TCP layer only. Is the IP over ATM operates over IP layer?
14.02.2019, 19:43, "David Miller" <davem@davemloft.net>:
> From: Nazarov Sergey <s-nazarov@yandex.ru>
> Date: Tue, 12 Feb 2019 18:10:03 +0300
>
>> Since cipso_v4_error might be called from different network stack layers, we can't safely use icmp_send there.
>> icmp_send copies IP options with ip_option_echo, which uses IPCB to take access to IP header compiled data.
>> But after commit 971f10ec ("tcp: better TCP_SKB_CB layout to reduce cache line misses"), IPCB can't be used
>> above IP layer.
>> This patch fixes the problem by creating in cipso_v4_error a local copy of compiled IP options and using it with
>> introduced __icmp_send function. This looks some overloaded, but in quite rare error conditions only.
>>
>> The original discussion is here:
>> https://lore.kernel.org/linux-security-module/16659801547571984@sas1-890ba5c2334a.qloud-c.yandex.net/
>>
>> Signed-off-by: Sergey Nazarov <s-nazarov@yandex.ru>
>
> This problem is not unique to Cipso, net/atm/clip.c's error handler
> has the same exact issue.
>
> I didn't scan more of the tree, there are probably a couple more
> locations as well.
next prev parent reply other threads:[~2019-02-14 18:14 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <16659801547571984@sas1-890ba5c2334a.qloud-c.yandex.net>
[not found] ` <1378e106-1826-2ab4-a3b1-88b57cee8497@schaufler-ca.com>
2019-01-15 19:52 ` Kernel memory corruption in CIPSO labeled TCP packets processing Paul Moore
2019-01-18 14:53 ` Paul Moore
2019-01-18 16:34 ` Nazarov Sergey
2019-01-18 17:17 ` Paul Moore
2019-01-21 17:11 ` Nazarov Sergey
2019-01-22 16:49 ` Paul Moore
2019-01-22 17:35 ` Nazarov Sergey
2019-01-22 17:48 ` Paul Moore
2019-01-24 14:46 ` Nazarov Sergey
2019-01-25 16:45 ` Paul Moore
2019-01-28 13:10 ` Nazarov Sergey
2019-01-28 22:18 ` Paul Moore
2019-01-29 7:23 ` Nazarov Sergey
2019-01-29 22:42 ` Paul Moore
2019-01-30 13:11 ` Nazarov Sergey
2019-01-31 2:10 ` Paul Moore
2019-01-31 13:20 ` Nazarov Sergey
2019-02-11 20:37 ` Paul Moore
2019-02-11 21:21 ` Nazarov Sergey
2019-02-11 23:43 ` Paul Moore
2019-02-12 15:10 ` [PATCH] NETWORKING: avoid use IPCB in cipso_v4_error Nazarov Sergey
2019-02-13 21:41 ` Paul Moore
2019-02-14 18:00 ` Nazarov Sergey
2019-02-14 18:59 ` Stephen Smalley
2019-02-14 16:43 ` David Miller
2019-02-14 18:14 ` Nazarov Sergey [this message]
2019-02-15 19:02 ` Paul Moore
2019-02-15 20:00 ` David Miller
2019-02-15 20:04 ` Paul Moore
2019-02-18 13:39 ` Nazarov Sergey
2019-02-19 1:25 ` David Miller
2019-02-22 16:35 ` Nazarov Sergey
2019-02-22 17:39 ` [PATCH v2 0/2] " Nazarov Sergey
2019-02-25 1:33 ` David Miller
2019-02-25 16:24 ` [PATCH v2 1/2] " Nazarov Sergey
2019-02-25 22:07 ` Paul Moore
2019-02-25 22:33 ` David Miller
2019-02-25 23:30 ` Paul Moore
2019-02-25 16:27 ` [PATCH v2 2/2] " Nazarov Sergey
2019-02-25 22:06 ` Paul Moore
2019-02-25 22:34 ` David Miller
2019-02-22 17:43 ` [PATCH v2 1/2] " Nazarov Sergey
2019-02-22 17:50 ` [PATCH v2 2/2] " Nazarov Sergey
2019-02-25 1:33 ` [PATCH] " David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=372221550168043@iva6-7bf5cb2fcad9.qloud-c.yandex.net \
--to=s-nazarov@yandex.ru \
--cc=davem@davemloft.net \
--cc=kuznet@ms2.inr.ac.ru \
--cc=linux-security-module@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=paul@paul-moore.com \
--cc=yoshfuji@linux-ipv6.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).