netdev - [PATCH OLK-5.10 v2 2/2] net: tap_open(): set sk_uid from current

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

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Date: Tue, 15 Aug 2023 21:56:02 +0800
From: Dong Chenchen <dongchenchen2@...wei.com>
To: <kernel@...neuler.org>
CC: <duanzi@....edu.cn>, <yuehaibing@...wei.com>, <weiyongjun1@...wei.com>,
	<liujian56@...wei.com>, Laszlo Ersek <lersek@...hat.com>, Eric Dumazet
	<edumazet@...gle.com>, Lorenzo Colitti <lorenzo@...gle.com>, Paolo Abeni
	<pabeni@...hat.com>, Pietro Borrello <borrello@...g.uniroma1.it>,
	<netdev@...r.kernel.org>, <stable@...r.kernel.org>, "David S . Miller"
	<davem@...emloft.net>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Dong
 Chenchen <dongchenchen2@...wei.com>
Subject: [PATCH OLK-5.10 v2 2/2] net: tap_open(): set sk_uid from current_fsuid()

From: Laszlo Ersek <lersek@...hat.com>

stable inclusion
from stable-v5.10.189
commit 33a339e717be2c88b7ad11375165168d5b40e38e
category: bugfix
bugzilla: 189104, https://gitee.com/src-openeuler/kernel/issues/I7QXHX
CVE: CVE-2023-4194

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=33a339e717be2c88b7ad11375165168d5b40e38e

---------------------------

commit 5c9241f3ceab3257abe2923a59950db0dc8bb737 upstream.

Commit 66b2c338adce initializes the "sk_uid" field in the protocol socket
(struct sock) from the "/dev/tapX" device node's owner UID. Per original
commit 86741ec25462 ("net: core: Add a UID field to struct sock.",
2016-11-04), that's wrong: the idea is to cache the UID of the userspace
process that creates the socket. Commit 86741ec25462 mentions socket() and
accept(); with "tap", the action that creates the socket is
open("/dev/tapX").

Therefore the device node's owner UID is irrelevant. In most cases,
"/dev/tapX" will be owned by root, so in practice, commit 66b2c338adce has
no observable effect:

- before, "sk_uid" would be zero, due to undefined behavior
  (CVE-2023-1076),

- after, "sk_uid" would be zero, due to "/dev/tapX" being owned by root.

What matters is the (fs)UID of the process performing the open(), so cache
that in "sk_uid".

Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Lorenzo Colitti <lorenzo@...gle.com>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Pietro Borrello <borrello@...g.uniroma1.it>
Cc: netdev@...r.kernel.org
Cc: stable@...r.kernel.org
Fixes: 66b2c338adce ("tap: tap_open(): correctly initialize socket uid")
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2173435
Signed-off-by: Laszlo Ersek <lersek@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Dong Chenchen <dongchenchen2@...wei.com>
---
 drivers/net/tap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/tap.c b/drivers/net/tap.c
index d9018d9fe310..2c9ae02ada3e 100644
--- a/drivers/net/tap.c
+++ b/drivers/net/tap.c
@@ -523,7 +523,7 @@ static int tap_open(struct inode *inode, struct file *file)
 	q->sock.state = SS_CONNECTED;
 	q->sock.file = file;
 	q->sock.ops = &tap_socket_ops;
-	sock_init_data_uid(&q->sock, &q->sk, inode->i_uid);
+	sock_init_data_uid(&q->sock, &q->sk, current_fsuid());
 	q->sk.sk_write_space = tap_sock_write_space;
 	q->sk.sk_destruct = tap_sock_destruct;
 	q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP;
-- 
2.25.1