From b5671c331cc2e78c83fc826a69dff461903c0fd5 Mon Sep 17 00:00:00 2001 From: Laura Abbott Date: Mon, 25 Jan 2016 15:10:02 -0800 Subject: [PATCHv2] vsock: Fix blocking ops call in prepare_to_wait To: "David S. Miller" Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org To: Aditya Asarwade To: Thomas Hellstrom To: Jorgen Hansen We receoved a bug report from someone using vmware: WARNING: CPU: 3 PID: 660 at kernel/sched/core.c:7389 __might_sleep+0x7d/0x90() do not call blocking ops when !TASK_RUNNING; state=1 set at [] prepare_to_wait+0x2d/0x90 Modules linked in: vmw_vsock_vmci_transport vsock snd_seq_midi snd_seq_midi_event snd_ens1371 iosf_mbi gameport snd_rawmidi snd_ac97_codec ac97_bus snd_seq coretemp snd_seq_device snd_pcm snd_timer snd soundcore ppdev crct10dif_pclmul crc32_pclmul ghash_clmulni_intel vmw_vmci vmw_balloon i2c_piix4 shpchp parport_pc parport acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd grace sunrpc btrfs xor raid6_pq 8021q garp stp llc mrp crc32c_intel serio_raw mptspi vmwgfx drm_kms_helper ttm drm scsi_transport_spi mptscsih e1000 ata_generic mptbase pata_acpi CPU: 3 PID: 660 Comm: vmtoolsd Not tainted 4.2.0-0.rc1.git3.1.fc23.x86_64 #1 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/20/2014 0000000000000000 0000000049e617f3 ffff88006ac37ac8 ffffffff818641f5 0000000000000000 ffff88006ac37b20 ffff88006ac37b08 ffffffff810ab446 ffff880068009f40 ffffffff81c63bc0 0000000000000061 0000000000000000 Call Trace: [] dump_stack+0x4c/0x65 [] warn_slowpath_common+0x86/0xc0 [] warn_slowpath_fmt+0x55/0x70 [] ? debug_lockdep_rcu_enabled+0x1d/0x20 [] ? prepare_to_wait+0x2d/0x90 [] ? prepare_to_wait+0x2d/0x90 [] __might_sleep+0x7d/0x90 [] __might_fault+0x43/0xa0 [] copy_from_iter+0x87/0x2a0 [] __qp_memcpy_to_queue+0x9a/0x1b0 [vmw_vmci] [] ? qp_memcpy_to_queue+0x20/0x20 [vmw_vmci] [] qp_memcpy_to_queue_iov+0x17/0x20 [vmw_vmci] [] qp_enqueue_locked+0xa0/0x140 [vmw_vmci] [] vmci_qpair_enquev+0x4f/0xd0 [vmw_vmci] [] vmci_transport_stream_enqueue+0x1b/0x20 [vmw_vsock_vmci_transport] [] vsock_stream_sendmsg+0x2c5/0x320 [vsock] [] ? wake_atomic_t_function+0x70/0x70 [] sock_sendmsg+0x38/0x50 [] SYSC_sendto+0x104/0x190 [] ? vfs_read+0x8a/0x140 [] SyS_sendto+0xe/0x10 [] entry_SYSCALL_64_fastpath+0x12/0x76 transport->stream_enqueue may call copy_to_user so it should not be called inside a prepare_to_wait. Narrow the scope of the prepare_to_wait to avoid the bad call. This also applies to vsock_stream_recvmsg as well. Reported-by: Vinson Lee Tested-by: Vinson Lee Signed-off-by: Laura Abbott --- v2: fix same issue in recvmsg path as well. --- net/vmw_vsock/af_vsock.c | 19 ++++++------------- 1 file changed, 6 insertions(+), 13 deletions(-) diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 7fd1220..bbe65dc 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1557,8 +1557,6 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, if (err < 0) goto out; - prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); - while (total_written < len) { ssize_t written; @@ -1578,7 +1576,9 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, goto out_wait; release_sock(sk); + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); timeout = schedule_timeout(timeout); + finish_wait(sk_sleep(sk), &wait); lock_sock(sk); if (signal_pending(current)) { err = sock_intr_errno(timeout); @@ -1588,8 +1588,6 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, goto out_wait; } - prepare_to_wait(sk_sleep(sk), &wait, - TASK_INTERRUPTIBLE); } /* These checks occur both as part of and after the loop @@ -1635,7 +1633,6 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, out_wait: if (total_written > 0) err = total_written; - finish_wait(sk_sleep(sk), &wait); out: release_sock(sk); return err; @@ -1716,7 +1713,6 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, if (err < 0) goto out; - prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); while (1) { s64 ready = vsock_stream_has_data(vsk); @@ -1727,7 +1723,7 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, */ err = -ENOMEM; - goto out_wait; + goto out; } else if (ready > 0) { ssize_t read; @@ -1750,7 +1746,7 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, vsk, target, read, !(flags & MSG_PEEK), &recv_data); if (err < 0) - goto out_wait; + goto out; if (read >= target || flags & MSG_PEEK) break; @@ -1773,7 +1769,9 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, break; release_sock(sk); + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); timeout = schedule_timeout(timeout); + finish_wait(sk_sleep(sk), &wait); lock_sock(sk); if (signal_pending(current)) { @@ -1783,9 +1781,6 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, err = -EAGAIN; break; } - - prepare_to_wait(sk_sleep(sk), &wait, - TASK_INTERRUPTIBLE); } } @@ -1816,8 +1811,6 @@ vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, err = copied; } -out_wait: - finish_wait(sk_sleep(sk), &wait); out: release_sock(sk); return err; -- 2.5.0