diff mbox series

[v2,v5.10.y] Bluetooth: RFCOMM: Fix not validating setsockopt user input

Message ID 20250124072047.5320-1-keerthana.kalyanasundaram@broadcom.com (mailing list archive)
State New, archived
Headers show
Series [v2,v5.10.y] Bluetooth: RFCOMM: Fix not validating setsockopt user input | expand

Checks

Context Check Description
tedd_an/pre-ci_am fail error: patch failed: net/bluetooth/rfcomm/sock.c:657 error: net/bluetooth/rfcomm/sock.c: patch does not apply hint: Use 'git am --show-current-patch' to see the failed patch

Commit Message

Keerthana K Jan. 24, 2025, 7:20 a.m. UTC 
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

[ Upstream commit a97de7bff13b1cc825c1b1344eaed8d6c2d3e695 ]

syzbot reported rfcomm_sock_setsockopt_old() is copying data without
checking user input length.

BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset
include/linux/sockptr.h:49 [inline]
BUG: KASAN: slab-out-of-bounds in copy_from_sockptr
include/linux/sockptr.h:55 [inline]
BUG: KASAN: slab-out-of-bounds in rfcomm_sock_setsockopt_old
net/bluetooth/rfcomm/sock.c:632 [inline]
BUG: KASAN: slab-out-of-bounds in rfcomm_sock_setsockopt+0x893/0xa70
net/bluetooth/rfcomm/sock.c:673
Read of size 4 at addr ffff8880209a8bc3 by task syz-executor632/5064

Fixes: 9f2c8a03fbb3 ("Bluetooth: Replace RFCOMM link mode with security level")
Fixes: bb23c0ab8246 ("Bluetooth: Add support for deferring RFCOMM connection setup")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[Keerthana: No changes from v1
            link to v1:
            https://lore.kernel.org/stable/2025012010-manager-dreamlike-b5c1@gregkh/]
Signed-off-by: Keerthana K <keerthana.kalyanasundaram@broadcom.com>
---
 net/bluetooth/rfcomm/sock.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

Comments

bluez.test.bot@gmail.com Jan. 24, 2025, 7:37 a.m. UTC | #1 
This is an automated email and please do not reply to this email.

Dear Submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
While preparing the CI tests, the patches you submitted couldn't be applied to the current HEAD of the repository.

----- Output -----

error: patch failed: net/bluetooth/rfcomm/sock.c:657
error: net/bluetooth/rfcomm/sock.c: patch does not apply
hint: Use 'git am --show-current-patch' to see the failed patch

Please resolve the issue and submit the patches again.


---
Regards,
Linux Bluetooth
diff mbox series

Patch

diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index ae6f80730561..56360da0827c 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -657,7 +657,7 @@  static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname,
 
 	switch (optname) {
 	case RFCOMM_LM:
-		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
+		if (bt_copy_from_sockptr(&opt, sizeof(opt), optval, optlen)) {
 			err = -EFAULT;
 			break;
 		}
@@ -692,7 +692,6 @@  static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname,
 	struct sock *sk = sock->sk;
 	struct bt_security sec;
 	int err = 0;
-	size_t len;
 	u32 opt;
 
 	BT_DBG("sk %p", sk);
@@ -714,11 +713,9 @@  static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname,
 
 		sec.level = BT_SECURITY_LOW;
 
-		len = min_t(unsigned int, sizeof(sec), optlen);
-		if (copy_from_sockptr(&sec, optval, len)) {
-			err = -EFAULT;
+		err = bt_copy_from_sockptr(&sec, sizeof(sec), optval, optlen);
+		if (err)
 			break;
-		}
 
 		if (sec.level > BT_SECURITY_HIGH) {
 			err = -EINVAL;
@@ -734,10 +731,9 @@  static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname,
 			break;
 		}
 
-		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
-			err = -EFAULT;
+		err = bt_copy_from_sockptr(&opt, sizeof(opt), optval, optlen);
+		if (err)
 			break;
-		}
 
 		if (opt)
 			set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);