netdev - [PATCH 5.15 1/1] bluetooth: Add cmd validity checks at the start of hci_sock

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: Windows password security audit tool. GUI, reports in PDF.

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

Date: Tue, 30 May 2023 15:39:44 +0300
From: Dragos-Marian Panait <dragos.panait@...driver.com>
To: stable@...r.kernel.org
Cc: Ruihan Li <lrh2000@....edu.cn>, Marcel Holtmann <marcel@...tmann.org>,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        netdev@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 5.15 1/1] bluetooth: Add cmd validity checks at the start of hci_sock_ioctl()

From: Ruihan Li <lrh2000@....edu.cn>

commit 000c2fa2c144c499c881a101819cf1936a1f7cf2 upstream.

Previously, channel open messages were always sent to monitors on the first
ioctl() call for unbound HCI sockets, even if the command and arguments
were completely invalid. This can leave an exploitable hole with the abuse
of invalid ioctl calls.

This commit hardens the ioctl processing logic by first checking if the
command is valid, and immediately returning with an ENOIOCTLCMD error code
if it is not. This ensures that ioctl calls with invalid commands are free
of side effects, and increases the difficulty of further exploitation by
forcing exploitation to find a way to pass a valid command first.

Signed-off-by: Ruihan Li <lrh2000@....edu.cn>
Co-developed-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Signed-off-by: Dragos-Marian Panait <dragos.panait@...driver.com>
---
 net/bluetooth/hci_sock.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 7905e005baa9..315f9ad3dc4d 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -980,6 +980,34 @@ static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
 
 	BT_DBG("cmd %x arg %lx", cmd, arg);
 
+	/* Make sure the cmd is valid before doing anything */
+	switch (cmd) {
+	case HCIGETDEVLIST:
+	case HCIGETDEVINFO:
+	case HCIGETCONNLIST:
+	case HCIDEVUP:
+	case HCIDEVDOWN:
+	case HCIDEVRESET:
+	case HCIDEVRESTAT:
+	case HCISETSCAN:
+	case HCISETAUTH:
+	case HCISETENCRYPT:
+	case HCISETPTYPE:
+	case HCISETLINKPOL:
+	case HCISETLINKMODE:
+	case HCISETACLMTU:
+	case HCISETSCOMTU:
+	case HCIINQUIRY:
+	case HCISETRAW:
+	case HCIGETCONNINFO:
+	case HCIGETAUTHINFO:
+	case HCIBLOCKADDR:
+	case HCIUNBLOCKADDR:
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+
 	lock_sock(sk);
 
 	if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
-- 
2.40.1