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Adalbert Lazăr

2019-Mar-06 10:13 UTC

[PATCH v2] vsock/virtio: fix kernel panic from virtio_transport_reset_no_sock

Previous to commit 22b5c0b63f32 ("vsock/virtio: fix kernel panic
after device hot-unplug"), vsock_core_init() was called from
virtio_vsock_probe(). Now, virtio_transport_reset_no_sock() can be called
before vsock_core_init() has the chance to run.

[Wed Feb 27 14:17:09 2019] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000110
[Wed Feb 27 14:17:09 2019] #PF error: [normal kernel read fault]
[Wed Feb 27 14:17:09 2019] PGD 0 P4D 0
[Wed Feb 27 14:17:09 2019] Oops: 0000 [#1] SMP PTI
[Wed Feb 27 14:17:09 2019] CPU: 3 PID: 59 Comm: kworker/3:1 Not tainted
5.0.0-rc7-390-generic-hvi #390
[Wed Feb 27 14:17:09 2019] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
[Wed Feb 27 14:17:09 2019] Workqueue: virtio_vsock virtio_transport_rx_work
[vmw_vsock_virtio_transport]
[Wed Feb 27 14:17:09 2019] RIP: 0010:virtio_transport_reset_no_sock+0x8c/0xc0
[vmw_vsock_virtio_transport_common]
[Wed Feb 27 14:17:09 2019] Code: 35 8b 4f 14 48 8b 57 08 31 f6 44 8b 4f 10 44 8b
07 48 8d 7d c8 e8 84 f8 ff ff 48 85 c0 48 89 c3 74 2a e8 f7 31 03 00 48 89 df
<48> 8b 80 10 01 00 00 e8 68 fb 69 ed 48 8b 75 f0 65 48 33 34 25 28
[Wed Feb 27 14:17:09 2019] RSP: 0018:ffffb42701ab7d40 EFLAGS: 00010282
[Wed Feb 27 14:17:09 2019] RAX: 0000000000000000 RBX: ffff9d79637ee080 RCX:
0000000000000003
[Wed Feb 27 14:17:09 2019] RDX: 0000000000000001 RSI: 0000000000000002 RDI:
ffff9d79637ee080
[Wed Feb 27 14:17:09 2019] RBP: ffffb42701ab7d78 R08: ffff9d796fae70e0 R09:
ffff9d796f403500
[Wed Feb 27 14:17:09 2019] R10: ffffb42701ab7d90 R11: 0000000000000000 R12:
ffff9d7969d09240
[Wed Feb 27 14:17:09 2019] R13: ffff9d79624e6840 R14: ffff9d7969d09318 R15:
ffff9d796d48ff80
[Wed Feb 27 14:17:09 2019] FS:  0000000000000000(0000) GS:ffff9d796fac0000(0000)
knlGS:0000000000000000
[Wed Feb 27 14:17:09 2019] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Wed Feb 27 14:17:09 2019] CR2: 0000000000000110 CR3: 0000000427f22000 CR4:
00000000000006e0
[Wed Feb 27 14:17:09 2019] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[Wed Feb 27 14:17:09 2019] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[Wed Feb 27 14:17:09 2019] Call Trace:
[Wed Feb 27 14:17:09 2019]  virtio_transport_recv_pkt+0x63/0x820
[vmw_vsock_virtio_transport_common]
[Wed Feb 27 14:17:09 2019]  ? kfree+0x17e/0x190
[Wed Feb 27 14:17:09 2019]  ? detach_buf_split+0x145/0x160
[Wed Feb 27 14:17:09 2019]  ? __switch_to_asm+0x40/0x70
[Wed Feb 27 14:17:09 2019]  virtio_transport_rx_work+0xa0/0x106
[vmw_vsock_virtio_transport]
[Wed Feb 27 14:17:09 2019] NET: Registered protocol family 40
[Wed Feb 27 14:17:09 2019]  process_one_work+0x167/0x410
[Wed Feb 27 14:17:09 2019]  worker_thread+0x4d/0x460
[Wed Feb 27 14:17:09 2019]  kthread+0x105/0x140
[Wed Feb 27 14:17:09 2019]  ? rescuer_thread+0x360/0x360
[Wed Feb 27 14:17:09 2019]  ? kthread_destroy_worker+0x50/0x50
[Wed Feb 27 14:17:09 2019]  ret_from_fork+0x35/0x40
[Wed Feb 27 14:17:09 2019] Modules linked in: vmw_vsock_virtio_transport
vmw_vsock_virtio_transport_common input_leds vsock serio_raw i2c_piix4 mac_hid
qemu_fw_cfg autofs4 cirrus ttm drm_kms_helper syscopyarea sysfillrect sysimgblt
fb_sys_fops virtio_net psmouse drm net_failover pata_acpi virtio_blk failover
floppy

Fixes: 22b5c0b63f32 ("vsock/virtio: fix kernel panic after device
hot-unplug")
Reported-by: Alexandru Herghelegiu <aherghelegiu at bitdefender.com>
Signed-off-by: Adalbert Laz?r <alazar at bitdefender.com>
Co-developed-by: Stefan Hajnoczi <stefanha at redhat.com>
---
 net/vmw_vsock/virtio_transport_common.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/net/vmw_vsock/virtio_transport_common.c
b/net/vmw_vsock/virtio_transport_common.c
index 3ae3a33da70b..602715fc9a75 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -662,6 +662,8 @@ static int virtio_transport_reset(struct vsock_sock *vsk,
  */
 static int virtio_transport_reset_no_sock(struct virtio_vsock_pkt *pkt)
 {
+	const struct virtio_transport *t;
+	struct virtio_vsock_pkt *reply;
 	struct virtio_vsock_pkt_info info = {
 		.op = VIRTIO_VSOCK_OP_RST,
 		.type = le16_to_cpu(pkt->hdr.type),
@@ -672,15 +674,21 @@ static int virtio_transport_reset_no_sock(struct
virtio_vsock_pkt *pkt)
 	if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
 		return 0;

-	pkt = virtio_transport_alloc_pkt(&info, 0,
-					 le64_to_cpu(pkt->hdr.dst_cid),
-					 le32_to_cpu(pkt->hdr.dst_port),
-					 le64_to_cpu(pkt->hdr.src_cid),
-					 le32_to_cpu(pkt->hdr.src_port));
-	if (!pkt)
+	reply = virtio_transport_alloc_pkt(&info, 0,
+					   le64_to_cpu(pkt->hdr.dst_cid),
+					   le32_to_cpu(pkt->hdr.dst_port),
+					   le64_to_cpu(pkt->hdr.src_cid),
+					   le32_to_cpu(pkt->hdr.src_port));
+	if (!reply)
 		return -ENOMEM;

-	return virtio_transport_get_ops()->send_pkt(pkt);
+	t = virtio_transport_get_ops();
+	if (!t) {
+		virtio_transport_free_pkt(reply);
+		return -ENOTCONN;
+	}
+
+	return t->send_pkt(reply);
 }

 static void virtio_transport_wait_close(struct sock *sk, long timeout)

Stefan Hajnoczi

2019-Mar-07 16:37 UTC

head link

[PATCH v2] vsock/virtio: fix kernel panic from virtio_transport_reset_no_sock

On Wed, Mar 06, 2019 at 12:13:53PM +0200, Adalbert Laz?r
wrote:> Previous to commit 22b5c0b63f32 ("vsock/virtio: fix kernel panic
> after device hot-unplug"), vsock_core_init() was called from
> virtio_vsock_probe(). Now, virtio_transport_reset_no_sock() can be called
> before vsock_core_init() has the chance to run.
> 
> [Wed Feb 27 14:17:09 2019] BUG: unable to handle kernel NULL pointer
dereference at 0000000000000110
> [Wed Feb 27 14:17:09 2019] #PF error: [normal kernel read fault]
> [Wed Feb 27 14:17:09 2019] PGD 0 P4D 0
> [Wed Feb 27 14:17:09 2019] Oops: 0000 [#1] SMP PTI
> [Wed Feb 27 14:17:09 2019] CPU: 3 PID: 59 Comm: kworker/3:1 Not tainted
5.0.0-rc7-390-generic-hvi #390
> [Wed Feb 27 14:17:09 2019] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
> [Wed Feb 27 14:17:09 2019] Workqueue: virtio_vsock virtio_transport_rx_work
[vmw_vsock_virtio_transport]
> [Wed Feb 27 14:17:09 2019] RIP:
0010:virtio_transport_reset_no_sock+0x8c/0xc0
[vmw_vsock_virtio_transport_common]
> [Wed Feb 27 14:17:09 2019] Code: 35 8b 4f 14 48 8b 57 08 31 f6 44 8b 4f 10
44 8b 07 48 8d 7d c8 e8 84 f8 ff ff 48 85 c0 48 89 c3 74 2a e8 f7 31 03 00 48 89
df <48> 8b 80 10 01 00 00 e8 68 fb 69 ed 48 8b 75 f0 65 48 33 34 25 28
> [Wed Feb 27 14:17:09 2019] RSP: 0018:ffffb42701ab7d40 EFLAGS: 00010282
> [Wed Feb 27 14:17:09 2019] RAX: 0000000000000000 RBX: ffff9d79637ee080 RCX:
0000000000000003
> [Wed Feb 27 14:17:09 2019] RDX: 0000000000000001 RSI: 0000000000000002 RDI:
ffff9d79637ee080
> [Wed Feb 27 14:17:09 2019] RBP: ffffb42701ab7d78 R08: ffff9d796fae70e0 R09:
ffff9d796f403500
> [Wed Feb 27 14:17:09 2019] R10: ffffb42701ab7d90 R11: 0000000000000000 R12:
ffff9d7969d09240
> [Wed Feb 27 14:17:09 2019] R13: ffff9d79624e6840 R14: ffff9d7969d09318 R15:
ffff9d796d48ff80
> [Wed Feb 27 14:17:09 2019] FS:  0000000000000000(0000)
GS:ffff9d796fac0000(0000) knlGS:0000000000000000
> [Wed Feb 27 14:17:09 2019] CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
> [Wed Feb 27 14:17:09 2019] CR2: 0000000000000110 CR3: 0000000427f22000 CR4:
00000000000006e0
> [Wed Feb 27 14:17:09 2019] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
> [Wed Feb 27 14:17:09 2019] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
> [Wed Feb 27 14:17:09 2019] Call Trace:
> [Wed Feb 27 14:17:09 2019]  virtio_transport_recv_pkt+0x63/0x820
[vmw_vsock_virtio_transport_common]
> [Wed Feb 27 14:17:09 2019]  ? kfree+0x17e/0x190
> [Wed Feb 27 14:17:09 2019]  ? detach_buf_split+0x145/0x160
> [Wed Feb 27 14:17:09 2019]  ? __switch_to_asm+0x40/0x70
> [Wed Feb 27 14:17:09 2019]  virtio_transport_rx_work+0xa0/0x106
[vmw_vsock_virtio_transport]
> [Wed Feb 27 14:17:09 2019] NET: Registered protocol family 40
> [Wed Feb 27 14:17:09 2019]  process_one_work+0x167/0x410
> [Wed Feb 27 14:17:09 2019]  worker_thread+0x4d/0x460
> [Wed Feb 27 14:17:09 2019]  kthread+0x105/0x140
> [Wed Feb 27 14:17:09 2019]  ? rescuer_thread+0x360/0x360
> [Wed Feb 27 14:17:09 2019]  ? kthread_destroy_worker+0x50/0x50
> [Wed Feb 27 14:17:09 2019]  ret_from_fork+0x35/0x40
> [Wed Feb 27 14:17:09 2019] Modules linked in: vmw_vsock_virtio_transport
vmw_vsock_virtio_transport_common input_leds vsock serio_raw i2c_piix4 mac_hid
qemu_fw_cfg autofs4 cirrus ttm drm_kms_helper syscopyarea sysfillrect sysimgblt
fb_sys_fops virtio_net psmouse drm net_failover pata_acpi virtio_blk failover
floppy
> 
> Fixes: 22b5c0b63f32 ("vsock/virtio: fix kernel panic after device
hot-unplug")
> Reported-by: Alexandru Herghelegiu <aherghelegiu at bitdefender.com>
> Signed-off-by: Adalbert Laz?r <alazar at bitdefender.com>
> Co-developed-by: Stefan Hajnoczi <stefanha at redhat.com>
> ---
>  net/vmw_vsock/virtio_transport_common.c | 22 +++++++++++++++-------
>  1 file changed, 15 insertions(+), 7 deletions(-)
Excellent, thanks!

Reviewed-by: Stefan Hajnoczi <stefanha at redhat.com>
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Stefano Garzarella

2019-Mar-07 19:12 UTC

head link

[PATCH v2] vsock/virtio: fix kernel panic from virtio_transport_reset_no_sock

On Wed, Mar 6, 2019 at 11:13 AM Adalbert Laz?r <alazar at bitdefender.com>
wrote:>
> Previous to commit 22b5c0b63f32 ("vsock/virtio: fix kernel panic
> after device hot-unplug"), vsock_core_init() was called from
> virtio_vsock_probe(). Now, virtio_transport_reset_no_sock() can be called
> before vsock_core_init() has the chance to run.
>
> [Wed Feb 27 14:17:09 2019] BUG: unable to handle kernel NULL pointer
dereference at 0000000000000110
> [Wed Feb 27 14:17:09 2019] #PF error: [normal kernel read fault]
> [Wed Feb 27 14:17:09 2019] PGD 0 P4D 0
> [Wed Feb 27 14:17:09 2019] Oops: 0000 [#1] SMP PTI
> [Wed Feb 27 14:17:09 2019] CPU: 3 PID: 59 Comm: kworker/3:1 Not tainted
5.0.0-rc7-390-generic-hvi #390
> [Wed Feb 27 14:17:09 2019] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
> [Wed Feb 27 14:17:09 2019] Workqueue: virtio_vsock virtio_transport_rx_work
[vmw_vsock_virtio_transport]
> [Wed Feb 27 14:17:09 2019] RIP:
0010:virtio_transport_reset_no_sock+0x8c/0xc0
[vmw_vsock_virtio_transport_common]
> [Wed Feb 27 14:17:09 2019] Code: 35 8b 4f 14 48 8b 57 08 31 f6 44 8b 4f 10
44 8b 07 48 8d 7d c8 e8 84 f8 ff ff 48 85 c0 48 89 c3 74 2a e8 f7 31 03 00 48 89
df <48> 8b 80 10 01 00 00 e8 68 fb 69 ed 48 8b 75 f0 65 48 33 34 25 28
> [Wed Feb 27 14:17:09 2019] RSP: 0018:ffffb42701ab7d40 EFLAGS: 00010282
> [Wed Feb 27 14:17:09 2019] RAX: 0000000000000000 RBX: ffff9d79637ee080 RCX:
0000000000000003
> [Wed Feb 27 14:17:09 2019] RDX: 0000000000000001 RSI: 0000000000000002 RDI:
ffff9d79637ee080
> [Wed Feb 27 14:17:09 2019] RBP: ffffb42701ab7d78 R08: ffff9d796fae70e0 R09:
ffff9d796f403500
> [Wed Feb 27 14:17:09 2019] R10: ffffb42701ab7d90 R11: 0000000000000000 R12:
ffff9d7969d09240
> [Wed Feb 27 14:17:09 2019] R13: ffff9d79624e6840 R14: ffff9d7969d09318 R15:
ffff9d796d48ff80
> [Wed Feb 27 14:17:09 2019] FS:  0000000000000000(0000)
GS:ffff9d796fac0000(0000) knlGS:0000000000000000
> [Wed Feb 27 14:17:09 2019] CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
> [Wed Feb 27 14:17:09 2019] CR2: 0000000000000110 CR3: 0000000427f22000 CR4:
00000000000006e0
> [Wed Feb 27 14:17:09 2019] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
> [Wed Feb 27 14:17:09 2019] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
> [Wed Feb 27 14:17:09 2019] Call Trace:
> [Wed Feb 27 14:17:09 2019]  virtio_transport_recv_pkt+0x63/0x820
[vmw_vsock_virtio_transport_common]
> [Wed Feb 27 14:17:09 2019]  ? kfree+0x17e/0x190
> [Wed Feb 27 14:17:09 2019]  ? detach_buf_split+0x145/0x160
> [Wed Feb 27 14:17:09 2019]  ? __switch_to_asm+0x40/0x70
> [Wed Feb 27 14:17:09 2019]  virtio_transport_rx_work+0xa0/0x106
[vmw_vsock_virtio_transport]
> [Wed Feb 27 14:17:09 2019] NET: Registered protocol family 40
> [Wed Feb 27 14:17:09 2019]  process_one_work+0x167/0x410
> [Wed Feb 27 14:17:09 2019]  worker_thread+0x4d/0x460
> [Wed Feb 27 14:17:09 2019]  kthread+0x105/0x140
> [Wed Feb 27 14:17:09 2019]  ? rescuer_thread+0x360/0x360
> [Wed Feb 27 14:17:09 2019]  ? kthread_destroy_worker+0x50/0x50
> [Wed Feb 27 14:17:09 2019]  ret_from_fork+0x35/0x40
> [Wed Feb 27 14:17:09 2019] Modules linked in: vmw_vsock_virtio_transport
vmw_vsock_virtio_transport_common input_leds vsock serio_raw i2c_piix4 mac_hid
qemu_fw_cfg autofs4 cirrus ttm drm_kms_helper syscopyarea sysfillrect sysimgblt
fb_sys_fops virtio_net psmouse drm net_failover pata_acpi virtio_blk failover
floppy
>
> Fixes: 22b5c0b63f32 ("vsock/virtio: fix kernel panic after device
hot-unplug")
> Reported-by: Alexandru Herghelegiu <aherghelegiu at bitdefender.com>
> Signed-off-by: Adalbert Laz?r <alazar at bitdefender.com>
> Co-developed-by: Stefan Hajnoczi <stefanha at redhat.com>
> ---
>  net/vmw_vsock/virtio_transport_common.c | 22 +++++++++++++++-------
>  1 file changed, 15 insertions(+), 7 deletions(-)
>
Thanks, LGTM!

Reviewed-by: Stefano Garzarella <sgarzare at redhat.com>

> diff --git a/net/vmw_vsock/virtio_transport_common.c
b/net/vmw_vsock/virtio_transport_common.c
> index 3ae3a33da70b..602715fc9a75 100644
> --- a/net/vmw_vsock/virtio_transport_common.c
> +++ b/net/vmw_vsock/virtio_transport_common.c
> @@ -662,6 +662,8 @@ static int virtio_transport_reset(struct vsock_sock
*vsk,
>   */
>  static int virtio_transport_reset_no_sock(struct virtio_vsock_pkt *pkt)
>  {
> +       const struct virtio_transport *t;
> +       struct virtio_vsock_pkt *reply;
>         struct virtio_vsock_pkt_info info = {
>                 .op = VIRTIO_VSOCK_OP_RST,
>                 .type = le16_to_cpu(pkt->hdr.type),
> @@ -672,15 +674,21 @@ static int virtio_transport_reset_no_sock(struct
virtio_vsock_pkt *pkt)
>         if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
>                 return 0;
>
> -       pkt = virtio_transport_alloc_pkt(&info, 0,
> -                                        le64_to_cpu(pkt->hdr.dst_cid),
> -                                        le32_to_cpu(pkt->hdr.dst_port),
> -                                        le64_to_cpu(pkt->hdr.src_cid),
> -                                       
le32_to_cpu(pkt->hdr.src_port));
> -       if (!pkt)
> +       reply = virtio_transport_alloc_pkt(&info, 0,
> +                                         
le64_to_cpu(pkt->hdr.dst_cid),
> +                                         
le32_to_cpu(pkt->hdr.dst_port),
> +                                         
le64_to_cpu(pkt->hdr.src_cid),
> +                                         
le32_to_cpu(pkt->hdr.src_port));
> +       if (!reply)
>                 return -ENOMEM;
>
> -       return virtio_transport_get_ops()->send_pkt(pkt);
> +       t = virtio_transport_get_ops();
> +       if (!t) {
> +               virtio_transport_free_pkt(reply);
> +               return -ENOTCONN;
> +       }
> +
> +       return t->send_pkt(reply);
>  }
>
>  static void virtio_transport_wait_close(struct sock *sk, long timeout)
>

-- 
Stefano Garzarella
Software Engineer @ Red Hat

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