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* kcm: fix a null pointer dereference in kcm_sendmsg()WANG Cong2017-02-141-2/+4
| | | | | | | | | | | | | In commit 98e3862ca2b1 ("kcm: fix 0-length case for kcm_sendmsg()") I tried to avoid skb allocation for 0-length case, but missed a check for NULL pointer in the non EOR case. Fixes: 98e3862ca2b1 ("kcm: fix 0-length case for kcm_sendmsg()") Reported-by: Dmitry Vyukov <dvyukov@google.com> Cc: Tom Herbert <tom@herbertland.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* kcm: fix 0-length case for kcm_sendmsg()WANG Cong2017-02-091-18/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Dmitry reported a kernel warning: WARNING: CPU: 3 PID: 2936 at net/kcm/kcmsock.c:627 kcm_write_msgs+0x12e3/0x1b90 net/kcm/kcmsock.c:627 CPU: 3 PID: 2936 Comm: a.out Not tainted 4.10.0-rc6+ #209 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:15 [inline] dump_stack+0x2ee/0x3ef lib/dump_stack.c:51 panic+0x1fb/0x412 kernel/panic.c:179 __warn+0x1c4/0x1e0 kernel/panic.c:539 warn_slowpath_null+0x2c/0x40 kernel/panic.c:582 kcm_write_msgs+0x12e3/0x1b90 net/kcm/kcmsock.c:627 kcm_sendmsg+0x163a/0x2200 net/kcm/kcmsock.c:1029 sock_sendmsg_nosec net/socket.c:635 [inline] sock_sendmsg+0xca/0x110 net/socket.c:645 sock_write_iter+0x326/0x600 net/socket.c:848 new_sync_write fs/read_write.c:499 [inline] __vfs_write+0x483/0x740 fs/read_write.c:512 vfs_write+0x187/0x530 fs/read_write.c:560 SYSC_write fs/read_write.c:607 [inline] SyS_write+0xfb/0x230 fs/read_write.c:599 entry_SYSCALL_64_fastpath+0x1f/0xc2 when calling syscall(__NR_write, sock2, 0x208aaf27ul, 0x0ul) on a KCM seqpacket socket. It appears that kcm_sendmsg() does not handle len==0 case correctly, which causes an empty skb is allocated and queued. Fix this by skipping the skb allocation for len==0 case. Reported-by: Dmitry Vyukov <dvyukov@google.com> Cc: Tom Herbert <tom@herbertland.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge branch 'work.splice_read' of ↵Linus Torvalds2016-10-071-15/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull VFS splice updates from Al Viro: "There's a bunch of branches this cycle, both mine and from other folks and I'd rather send pull requests separately. This one is the conversion of ->splice_read() to ITER_PIPE iov_iter (and introduction of such). Gets rid of a lot of code in fs/splice.c and elsewhere; there will be followups, but these are for the next cycle... Some pipe/splice-related cleanups from Miklos in the same branch as well" * 'work.splice_read' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: pipe: fix comment in pipe_buf_operations pipe: add pipe_buf_steal() helper pipe: add pipe_buf_confirm() helper pipe: add pipe_buf_release() helper pipe: add pipe_buf_get() helper relay: simplify relay_file_read() switch default_file_splice_read() to use of pipe-backed iov_iter switch generic_file_splice_read() to use of ->read_iter() new iov_iter flavour: pipe-backed fuse_dev_splice_read(): switch to add_to_pipe() skb_splice_bits(): get rid of callback new helper: add_to_pipe() splice: lift pipe_lock out of splice_to_pipe() splice: switch get_iovec_page_array() to iov_iter splice_to_pipe(): don't open-code wakeup_pipe_readers() consistent treatment of EFAULT on O_DIRECT read/write
| * skb_splice_bits(): get rid of callbackAl Viro2016-10-031-15/+1
| | | | | | | | | | | | | | | | | | since pipe_lock is the outermost now, we don't need to drop/regain socket locks around the call of splice_to_pipe() from skb_splice_bits(), which kills the need to have a socket-specific callback; we can just call splice_to_pipe() and be done with that. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2016-09-121-1/+2
|\| | | | | | | | | | | | | | | | | | | | | Conflicts: drivers/net/ethernet/mediatek/mtk_eth_soc.c drivers/net/ethernet/qlogic/qed/qed_dcbx.c drivers/net/phy/Kconfig All conflicts were cases of overlapping commits. Signed-off-by: David S. Miller <davem@davemloft.net>
| * kcm: fix a socket double freeWANG Cong2016-08-311-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Dmitry reported a double free on kcm socket, which could be easily reproduced by: #include <unistd.h> #include <sys/syscall.h> int main() { int fd = syscall(SYS_socket, 0x29ul, 0x5ul, 0x0ul, 0, 0, 0); syscall(SYS_ioctl, fd, 0x89e2ul, 0x20a98000ul, 0, 0, 0); return 0; } This is because on the error path, after we install the new socket file, we call sock_release() to clean up the socket, which leaves the fd pointing to a freed socket. Fix this by calling sys_close() on that fd directly. Fixes: ab7ac4eb9832 ("kcm: Kernel Connection Multiplexor module") Reported-by: Dmitry Vyukov <dvyukov@google.com> Cc: Tom Herbert <tom@herbertland.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | kcm: Remove TCP specific references from kcm and strparserTom Herbert2016-08-281-17/+13
| | | | | | | | | | | | | | | | | | | | kcm and strparser need to work with any type of stream socket not just TCP. Eliminate references to TCP and call generic proto_ops functions of read_sock and peek_len. Also in strp_init check if the socket support the proto_ops read_sock and peek_len. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | kcm: Fix locking issueTom Herbert2016-08-232-10/+23
| | | | | | | | | | | | | | | | | | | | Lock the lower socket in kcm_unattach. Release during call to strp_done since that function cancels the RX timers and work queue with sync. Also added some status information in psock reporting. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | kcm: Use stream parserTom Herbert2016-08-173-391/+110
|/ | | | | | | | Adapt KCM to use the stream parser. This mostly involves removing the RX handling and setting up the strparser using the interface. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* kcm: remove redundant -ve error check and return pathColin Ian King2016-07-251-5/+1
| | | | | | | | | The check for a -ve error is redundant, remove it and just immediately return the return value from the call to seq_open_net. Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* bpf: refactor bpf_prog_get and type check into helperDaniel Borkmann2016-07-011-7/+1
| | | | | | | | | | | | | | | | Since bpf_prog_get() and program type check is used in a couple of places, refactor this into a small helper function that we can make use of. Since the non RO prog->aux part is not used in performance critical paths and a program destruction via RCU is rather very unlikley when doing the put, we shouldn't have an issue just doing the bpf_prog_get() + prog->type != type check, but actually not taking the ref at all (due to being in fdget() / fdput() section of the bpf fd) is even cleaner and makes the diff smaller as well, so just go for that. Callsites are changed to make use of the new helper where possible. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* kcm: fix /proc memory leakJiri Slaby2016-06-221-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Every open of /proc/net/kcm leaks 16 bytes of memory as is reported by kmemleak: unreferenced object 0xffff88059c0e3458 (size 192): comm "cat", pid 1401, jiffies 4294935742 (age 310.720s) hex dump (first 32 bytes): 28 45 71 96 05 88 ff ff 00 10 00 00 00 00 00 00 (Eq............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8156a2de>] kmem_cache_alloc_trace+0x16e/0x230 [<ffffffff8162a479>] seq_open+0x79/0x1d0 [<ffffffffa0578510>] kcm_seq_open+0x0/0x30 [kcm] [<ffffffff8162a479>] seq_open+0x79/0x1d0 [<ffffffff8162a8cf>] __seq_open_private+0x2f/0xa0 [<ffffffff81712548>] seq_open_net+0x38/0xa0 ... It is caused by a missing free in the ->release path. So fix it by providing seq_release_net as the ->release method. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Fixes: cd6e111bf5 (kcm: Add statistics and proc interfaces) Cc: "David S. Miller" <davem@davemloft.net> Cc: Tom Herbert <tom@herbertland.com> Cc: netdev@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
* kcm: fix a signedness in kcm_splice_read()WANG Cong2016-05-191-1/+1
| | | | | | | | | | | | | | skb_splice_bits() returns int, kcm_splice_read() returns ssize_t, both are signed. We may need another patch to make them all ssize_t, but that deserves a separated patch. Fixes: 91687355b927 ("kcm: Splice support") Reported-by: David Binderman <linuxdev.baldrick@gmail.com> Cc: Tom Herbert <tom@herbertland.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* kcm: Add receive message timeoutTom Herbert2016-03-092-2/+36
| | | | | | | | | | | | | | | This patch adds receive timeout for message assembly on the attached TCP sockets. The timeout is set when a new messages is started and the whole message has not been received by TCP (not in the receive queue). If the completely message is subsequently received the timer is cancelled, if the timer expires the RX side is aborted. The timeout value is taken from the socket timeout (SO_RCVTIMEO) that is set on a TCP socket (i.e. set by get sockopt before attaching a TCP socket to KCM. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* kcm: Add memory limit for receive message constructionTom Herbert2016-03-092-2/+48
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Message assembly is performed on the TCP socket. This is logically equivalent of an application that performs a peek on the socket to find out how much memory is needed for a receive buffer. The receive socket buffer also provides the maximum message size which is checked. The receive algorithm is something like: 1) Receive the first skbuf for a message (or skbufs if multiple are needed to determine message length). 2) Check the message length against the number of bytes in the TCP receive queue (tcp_inq()). - If all the bytes of the message are in the queue (incluing the skbuf received), then proceed with message assembly (it should complete with the tcp_read_sock) - Else, mark the psock with the number of bytes needed to complete the message. 3) In TCP data ready function, if the psock indicates that we are waiting for the rest of the bytes of a messages, check the number of queued bytes against that. - If there are still not enough bytes for the message, just return - Else, clear the waiting bytes and proceed to receive the skbufs. The message should now be received in one tcp_read_sock Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* kcm: Sendpage supportTom Herbert2016-03-091-2/+145
| | | | | | | | Implement kcm_sendpage. Set in sendpage to kcm_sendpage in both dgram and seqpacket ops. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* kcm: Splice supportTom Herbert2016-03-091-2/+96
| | | | | | | | Implement kcm_splice_read. This is supported only for seqpacket. Add kcm_seqpacket_ops and set splice read to kcm_splice_read. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* kcm: Add statistics and proc interfacesTom Herbert2016-03-093-1/+503
| | | | | | | | | | | | | This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* kcm: Kernel Connection Multiplexor moduleTom Herbert2016-03-093-0/+2029
This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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