From: Vladimir Davydov <vdavydov@parallels.com>
To: <davem@davemloft.net>
Cc: <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Marcel Holtmann <marcel@holtmann.org>,
Gustavo Padovan <gustavo@padovan.org>,
Johan Hedberg <johan.hedberg@gmail.com>
Subject: [PATCH] bluetooth: never linger on process exit
Date: Tue, 15 Jul 2014 12:25:28 +0400 [thread overview]
Message-ID: <1405412728-4706-1-git-send-email-vdavydov@parallels.com> (raw)
If the current process is exiting, lingering on socket close will make
it unkillable, so we should avoid it.
Reproducer:
#include <sys/types.h>
#include <sys/socket.h>
#define BTPROTO_L2CAP 0
#define BTPROTO_SCO 2
#define BTPROTO_RFCOMM 3
int main()
{
int fd;
struct linger ling;
fd = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
//or: fd = socket(PF_BLUETOOTH, SOCK_DGRAM, BTPROTO_L2CAP);
//or: fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_SCO);
ling.l_onoff = 1;
ling.l_linger = 1000000000;
setsockopt(fd, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling));
return 0;
}
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
---
net/bluetooth/l2cap_sock.c | 3 ++-
net/bluetooth/rfcomm/sock.c | 3 ++-
net/bluetooth/sco.c | 6 ++++--
3 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index e1378693cc90..d0fd8b04f2e6 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1111,7 +1111,8 @@ static int l2cap_sock_shutdown(struct socket *sock, int how)
l2cap_chan_close(chan, 0);
lock_sock(sk);
- if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
+ if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
+ !(current->flags & PF_EXITING))
err = bt_sock_wait_state(sk, BT_CLOSED,
sk->sk_lingertime);
}
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index c603a5eb4720..8bbbb5ec468c 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -918,7 +918,8 @@ static int rfcomm_sock_shutdown(struct socket *sock, int how)
sk->sk_shutdown = SHUTDOWN_MASK;
__rfcomm_sock_close(sk);
- if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
+ if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
+ !(current->flags & PF_EXITING))
err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
}
release_sock(sk);
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index c06dbd3938e8..dbbbc0292bd0 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -909,7 +909,8 @@ static int sco_sock_shutdown(struct socket *sock, int how)
sco_sock_clear_timer(sk);
__sco_sock_close(sk);
- if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
+ if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
+ !(current->flags & PF_EXITING))
err = bt_sock_wait_state(sk, BT_CLOSED,
sk->sk_lingertime);
}
@@ -929,7 +930,8 @@ static int sco_sock_release(struct socket *sock)
sco_sock_close(sk);
- if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
+ if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
+ !(current->flags & PF_EXITING)) {
lock_sock(sk);
err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
release_sock(sk);
--
1.7.10.4
next reply other threads:[~2014-07-15 8:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-15 8:25 Vladimir Davydov [this message]
[not found] ` <1405412728-4706-1-git-send-email-vdavydov-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2014-07-17 10:05 ` [PATCH] bluetooth: never linger on process exit Marcel Holtmann
2014-07-17 10:16 ` Marcel Holtmann
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