Remove the rfcomm_carrier_raised() definition as that function isn't used anymore. Signed-off-by: Gianluca Anzolin <gianluca@sottospazio.it> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This patch fixes two regressions introduced with the recent rfcomm tty rework. The current code uses the carrier_raised() method to wait for the bluetooth connection when a process opens the tty. However processes may open the port with the O_NONBLOCK flag or set the CLOCAL termios flag: in these cases the open() syscall returns immediately without waiting for the bluetooth connection to complete. This behaviour confuses userspace which expects an established bluetooth connection. The patch restores the old behaviour by waiting for the connection in rfcomm_dev_activate() and removes carrier_raised() from the tty_port ops. As a side effect the new code also fixes the case in which the rfcomm tty device is created with the flag RFCOMM_REUSE_DLC: the old code didn't call device_move() and ModemManager skipped the detection probe. Now device_move() is always called inside rfcomm_dev_activate(). Signed-off-by: Gianluca Anzolin <gianluca@sottospazio.it> Reported-by: Andrey Vihrov <andrey.vihrov@gmail.com> Reported-by: Beson Chow <blc+bluez@mail.vanade.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This is a preparatory patch which moves the rfcomm_get_device() definition before rfcomm_dev_activate() where it will be used. Signed-off-by: Gianluca Anzolin <gianluca@sottospazio.it> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This patch fixes a userspace regression introduced by the commit 29cd718b. If the rfcomm device was created with the flag RFCOMM_RELEASE_ONHUP the user space expects that the tty_port is released as soon as the last process closes the tty. The current code attempts to release the port in the function rfcomm_dev_state_change(). However it won't get a reference to the relevant tty to send a HUP: at that point the tty is already destroyed and therefore NULL. This patch fixes the regression by taking over the tty refcount in the tty install method(). This way the tty_port is automatically released as soon as the tty is destroyed. As a consequence the check for RFCOMM_RELEASE_ONHUP flag in the hangup() method is now redundant. Instead we have to be careful with the reference counting in the rfcomm_release_dev() function. Signed-off-by: Gianluca Anzolin <gianluca@sottospazio.it> Reported-by: Alexander Holler <holler@ahsoftware.de> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This patch now always passes msg->msg_namelen as 0. recvmsg handlers must set msg_namelen to the proper size <= sizeof(struct sockaddr_storage) to return msg_name to the user. This prevents numerous uninitialized memory leaks we had in the recvmsg handlers and makes it harder for new code to accidentally leak uninitialized memory. Optimize for the case recvfrom is called with NULL as address. We don't need to copy the address at all, so set it to NULL before invoking the recvmsg handler. We can do so, because all the recvmsg handlers must cope with the case a plain read() is called on them. read() also sets msg_name to NULL. Also document these changes in include/linux/net.h as suggested by David Miller. Changes since RFC: Set msg->msg_name = NULL if user specified a NULL in msg_name but had a non-null msg_namelen in verify_iovec/verify_compat_iovec. This doesn't affect sendto as it would bail out earlier while trying to copy-in the address. It also more naturally reflects the logic by the callers of verify_iovec. With this change in place I could remove " if (!uaddr || msg_sys->msg_namelen == 0) msg->msg_name = NULL ". This change does not alter the user visible error logic as we ignore msg_namelen as long as msg_name is NULL. Also remove two unnecessary curly brackets in ___sys_recvmsg and change comments to netdev style. Cc: David Miller <davem@davemloft.net> Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
L2CAP socket validates proper bdaddr_type for connect, so this patch fixes to set explictly bdaddr_type for RFCOMM connect. Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
L2CAP socket bind checks its bdaddr type but RFCOMM kernel thread does not assign proper bdaddr type for L2CAP sock. This can cause that RFCOMM failure. Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
The commit 94a86df01082557e2de45865e538d7fb6c46231c seem to have
uncovered a long standing bug that did not trigger so far.
BUG: unable to handle kernel paging request at 00000009dd503502
IP: [<ffffffff815b1868>] rfcomm_sock_getsockopt+0x128/0x200
PGD 0
Oops: 0000 [#1] SMP
Modules linked in: ath5k ath mac80211 cfg80211
CPU: 2 PID: 1459 Comm: bluetoothd Not tainted 3.11.0-133163-gcebd830 #2
Hardware name: System manufacturer System Product Name/P6T DELUXE V2, BIOS
1202 12/22/2010
task: ffff8803304106a0 ti: ffff88033046a000 task.ti: ffff88033046a000
RIP: 0010:[<ffffffff815b1868>] [<ffffffff815b1868>]
rfcomm_sock_getsockopt+0x128/0x200
RSP: 0018:ffff88033046bed8 EFLAGS: 00010246
RAX: 00000009dd503502 RBX: 0000000000000003 RCX: 00007fffa2ed5548
RDX: 0000000000000003 RSI: 0000000000000012 RDI: ffff88032fd37480
RBP: ffff88033046bf28 R08: 00007fffa2ed554c R09: ffff88032f5707d8
R10: 00007fffa2ed5548 R11: 0000000000000202 R12: ffff880330bbd000
R13: 00007fffa2ed5548 R14: 0000000000000003 R15: 00007fffa2ed554c
FS: 00007fc44cfac700(0000) GS:ffff88033fc80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000009dd503502 CR3: 00000003304c2000 CR4: 00000000000007e0
Stack:
ffff88033046bf28 ffffffff815b0f2f ffff88033046bf18 0002ffff81105ef6
0000000600000000 ffff88032fd37480 0000000000000012 00007fffa2ed5548
0000000000000003 00007fffa2ed554c ffff88033046bf78 ffffffff814c0380
Call Trace:
[<ffffffff815b0f2f>] ? rfcomm_sock_setsockopt+0x5f/0x190
[<ffffffff814c0380>] SyS_getsockopt+0x60/0xb0
[<ffffffff815e0852>] system_call_fastpath+0x16/0x1b
Code: 02 00 00 00 0f 47 d0 4c 89 ef e8 74 13 cd ff 83 f8 01 19 c9 f7 d1 83 e1
f2 e9 4b ff ff ff 0f 1f 44 00 00 49 8b 84 24 70 02 00 00 <4c> 8b 30 4c 89 c0 e8
2d 19 cd ff 85 c0 49 89 d7 b9 f2 ff ff ff
RIP [<ffffffff815b1868>] rfcomm_sock_getsockopt+0x128/0x200
RSP <ffff88033046bed8>
CR2: 00000009dd503502
It triggers in the following segment of the code:
0x1313 is in rfcomm_sock_getsockopt (net/bluetooth/rfcomm/sock.c:743).
738
739 static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
740 {
741 struct sock *sk = sock->sk;
742 struct rfcomm_conninfo cinfo;
743 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
744 int len, err = 0;
745 u32 opt;
746
747 BT_DBG("sk %p", sk);
The l2cap_pi(sk) is wrong here since it should have been rfcomm_pi(sk),
but that socket of course does not contain the low-level connection
details requested here.
Tracking down the actual offending commit, it seems that this has been
introduced when doing some L2CAP refactoring:
commit 8c1d787be4b62d2d1b6f04953eca4bcf7c839d44
Author: Gustavo F. Padovan <padovan@profusion.mobi>
Date: Wed Apr 13 20:23:55 2011 -0300
@@ -743,6 +743,7 @@ static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __u
struct sock *sk = sock->sk;
struct sock *l2cap_sk;
struct rfcomm_conninfo cinfo;
+ struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
int len, err = 0;
u32 opt;
@@ -787,8 +788,8 @@ static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __u
l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk;
- cinfo.hci_handle = l2cap_pi(l2cap_sk)->conn->hcon->handle;
- memcpy(cinfo.dev_class, l2cap_pi(l2cap_sk)->conn->hcon->dev_class, 3);
+ cinfo.hci_handle = conn->hcon->handle;
+ memcpy(cinfo.dev_class, conn->hcon->dev_class, 3);
The l2cap_sk got accidentally mixed into the sk (which is RFCOMM) and
now causing a problem within getsocketopt() system call. To fix this,
just re-introduce l2cap_sk and make sure the right socket is used for
the low-level connection details.
Reported-by: Fabio Rossi <rossi.f@inwind.it>
Reported-by: Janusz Dziedzic <janusz.dziedzic@gmail.com>
Tested-by: Janusz Dziedzic <janusz.dziedzic@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>