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Tsirkin" , Kevin Wolf , Max Reitz , qemu-block@nongnu.org (open list:Block layer core), qemu-devel@nongnu.org (open list:All patches CC here) Subject: [PATCH 1/4] vhost-user-blk: delay vhost_user_blk_disconnect Date: Wed, 15 Apr 2020 11:28:23 +0800 Message-Id: <20200415032826.16701-2-fengli@smartx.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20200415032826.16701-1-fengli@smartx.com> References: <20200415032826.16701-1-fengli@smartx.com> Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::542 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Li Feng Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @smartx-com.20150623.gappssmtp.com) Content-Type: text/plain; charset="utf-8" Since commit b0a335e351103bf92f3f9d0bd5759311be8156ac, a socket write may trigger a disconnect events, calling vhost_user_blk_disconnect() and clearing all the vhost_dev strutures. Then the next socket read will encounter an invalid pointer to vhost_dev. Signed-off-by: Li Feng --- hw/block/vhost-user-blk.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 17df5338e7..776b9af3eb 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -349,11 +349,24 @@ static void vhost_user_blk_disconnect(DeviceState *de= v) vhost_dev_cleanup(&s->dev); } =20 +static void vhost_user_blk_event(void *opaque, QEMUChrEvent event); + +static void vhost_user_blk_chr_closed_bh(void *opaque) +{ + DeviceState *dev =3D opaque; + VirtIODevice *vdev =3D VIRTIO_DEVICE(dev); + VHostUserBlk *s =3D VHOST_USER_BLK(vdev); + vhost_user_blk_disconnect(dev); + qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, vhost_user_blk_even= t, + NULL, (void *)dev, NULL, true); +} + static void vhost_user_blk_event(void *opaque, QEMUChrEvent event) { DeviceState *dev =3D opaque; VirtIODevice *vdev =3D VIRTIO_DEVICE(dev); VHostUserBlk *s =3D VHOST_USER_BLK(vdev); + AioContext *ctx; =20 switch (event) { case CHR_EVENT_OPENED: @@ -363,7 +376,16 @@ static void vhost_user_blk_event(void *opaque, QEMUChr= Event event) } break; case CHR_EVENT_CLOSED: - vhost_user_blk_disconnect(dev); + /* + * a close event may happen during a read/write, but vhost + * code assumes the vhost_dev remains setup, so delay the + * stop & clear to idle. + */ + ctx =3D qemu_get_current_aio_context(); + + qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, NULL, + NULL, NULL, NULL, false); + aio_bh_schedule_oneshot(ctx, vhost_user_blk_chr_closed_bh, opaque); break; case CHR_EVENT_BREAK: case CHR_EVENT_MUX_IN: --=20 2.11.0 --=20 The SmartX email address is only for business purpose. Any sent message=20 that is not related to the business is not authorized or permitted by=20 SmartX. =E6=9C=AC=E9=82=AE=E7=AE=B1=E4=B8=BA=E5=8C=97=E4=BA=AC=E5=BF=97=E5=87=8C=E6= =B5=B7=E7=BA=B3=E7=A7=91=E6=8A=80=E6=9C=89=E9=99=90=E5=85=AC=E5=8F=B8=EF=BC= =88SmartX=EF=BC=89=E5=B7=A5=E4=BD=9C=E9=82=AE=E7=AE=B1. =E5=A6=82=E6=9C=AC= =E9=82=AE=E7=AE=B1=E5=8F=91=E5=87=BA=E7=9A=84=E9=82=AE=E4=BB=B6=E4=B8=8E=E5= =B7=A5=E4=BD=9C=E6=97=A0=E5=85=B3,=E8=AF=A5=E9=82=AE=E4=BB=B6=E6=9C=AA=E5= =BE=97=E5=88=B0=E6=9C=AC=E5=85=AC=E5=8F=B8=E4=BB=BB=E4=BD=95=E7=9A=84=E6=98= =8E=E7=A4=BA=E6=88=96=E9=BB=98=E7=A4=BA=E7=9A=84=E6=8E=88=E6=9D=83. 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Tsirkin" , Kevin Wolf , Max Reitz , qemu-block@nongnu.org (open list:Block layer core), qemu-devel@nongnu.org (open list:All patches CC here) Subject: [PATCH 2/4] vhost-user-blk: fix invalid memory access Date: Wed, 15 Apr 2020 11:28:24 +0800 Message-Id: <20200415032826.16701-3-fengli@smartx.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20200415032826.16701-1-fengli@smartx.com> References: <20200415032826.16701-1-fengli@smartx.com> Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::641 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Li Feng Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @smartx-com.20150623.gappssmtp.com) Content-Type: text/plain; charset="utf-8" when s->inflight is freed, vhost_dev_free_inflight may try to access s->inflight->addr, it will retrigger the following issue. =3D=3D7309=3D=3DERROR: AddressSanitizer: heap-use-after-free on address 0x6= 04001020d18 at pc 0x555555ce948a bp 0x7fffffffb170 sp 0x7fffffffb160 READ of size 8 at 0x604001020d18 thread T0 #0 0x555555ce9489 in vhost_dev_free_inflight /root/smartx/qemu-el7/qemu= -test/hw/virtio/vhost.c:1473 #1 0x555555cd86eb in virtio_reset /root/smartx/qemu-el7/qemu-test/hw/vi= rtio/virtio.c:1214 #2 0x5555560d3eff in virtio_pci_reset hw/virtio/virtio-pci.c:1859 #3 0x555555f2ac53 in device_set_realized hw/core/qdev.c:893 #4 0x5555561d572c in property_set_bool qom/object.c:1925 #5 0x5555561de8de in object_property_set_qobject qom/qom-qobject.c:27 #6 0x5555561d99f4 in object_property_set_bool qom/object.c:1188 #7 0x555555e50ae7 in qdev_device_add /root/smartx/qemu-el7/qemu-test/qd= ev-monitor.c:626 #8 0x555555e51213 in qmp_device_add /root/smartx/qemu-el7/qemu-test/qde= v-monitor.c:806 #9 0x555555e8ff40 in hmp_device_add /root/smartx/qemu-el7/qemu-test/hmp= .c:1951 #10 0x555555be889a in handle_hmp_command /root/smartx/qemu-el7/qemu-tes= t/monitor.c:3404 #11 0x555555beac8b in monitor_command_cb /root/smartx/qemu-el7/qemu-tes= t/monitor.c:4296 #12 0x555556433eb7 in readline_handle_byte util/readline.c:393 #13 0x555555be89ec in monitor_read /root/smartx/qemu-el7/qemu-test/moni= tor.c:4279 #14 0x5555563285cc in tcp_chr_read chardev/char-socket.c:470 #15 0x7ffff670b968 in g_main_context_dispatch (/lib64/libglib-2.0.so.0+= 0x4a968) #16 0x55555640727c in glib_pollfds_poll util/main-loop.c:215 #17 0x55555640727c in os_host_main_loop_wait util/main-loop.c:238 #18 0x55555640727c in main_loop_wait util/main-loop.c:497 #19 0x555555b2d0bf in main_loop /root/smartx/qemu-el7/qemu-test/vl.c:20= 13 #20 0x555555b2d0bf in main /root/smartx/qemu-el7/qemu-test/vl.c:4776 #21 0x7fffdd2eb444 in __libc_start_main (/lib64/libc.so.6+0x22444) #22 0x555555b3767a (/root/smartx/qemu-el7/qemu-test/x86_64-softmmu/qem= u-system-x86_64+0x5e367a) 0x604001020d18 is located 8 bytes inside of 40-byte region [0x604001020d10,= 0x604001020d38) freed by thread T0 here: #0 0x7ffff6f00508 in __interceptor_free (/lib64/libasan.so.4+0xde508) #1 0x7ffff671107d in g_free (/lib64/libglib-2.0.so.0+0x5007d) previously allocated by thread T0 here: #0 0x7ffff6f00a88 in __interceptor_calloc (/lib64/libasan.so.4+0xdea88) #1 0x7ffff6710fc5 in g_malloc0 (/lib64/libglib-2.0.so.0+0x4ffc5) SUMMARY: AddressSanitizer: heap-use-after-free /root/smartx/qemu-el7/qemu-t= est/hw/virtio/vhost.c:1473 in vhost_dev_free_inflight Shadow bytes around the buggy address: 0x0c08801fc150: fa fa 00 00 00 00 04 fa fa fa fd fd fd fd fd fa 0x0c08801fc160: fa fa fd fd fd fd fd fd fa fa 00 00 00 00 04 fa 0x0c08801fc170: fa fa 00 00 00 00 00 01 fa fa 00 00 00 00 04 fa 0x0c08801fc180: fa fa 00 00 00 00 00 01 fa fa 00 00 00 00 00 01 0x0c08801fc190: fa fa 00 00 00 00 00 fa fa fa 00 00 00 00 04 fa =3D>0x0c08801fc1a0: fa fa fd[fd]fd fd fd fa fa fa fd fd fd fd fd fa 0x0c08801fc1b0: fa fa fd fd fd fd fd fa fa fa fd fd fd fd fd fa 0x0c08801fc1c0: fa fa 00 00 00 00 00 fa fa fa fd fd fd fd fd fd 0x0c08801fc1d0: fa fa 00 00 00 00 00 01 fa fa fd fd fd fd fd fa 0x0c08801fc1e0: fa fa fd fd fd fd fd fa fa fa fd fd fd fd fd fd 0x0c08801fc1f0: fa fa 00 00 00 00 00 01 fa fa fd fd fd fd fd fa Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb =3D=3D7309=3D=3DABORTING Signed-off-by: Li Feng Reviewed-by: Raphael Norwitz --- hw/block/vhost-user-blk.c | 4 ++++ hw/virtio/vhost.c | 2 +- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 776b9af3eb..19e79b96e4 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -463,7 +463,9 @@ reconnect: =20 virtio_err: g_free(s->vhost_vqs); + s->vhost_vqs =3D NULL; g_free(s->inflight); + s->inflight =3D NULL; for (i =3D 0; i < s->num_queues; i++) { virtio_delete_queue(s->virtqs[i]); } @@ -484,7 +486,9 @@ static void vhost_user_blk_device_unrealize(DeviceState= *dev, Error **errp) vhost_dev_cleanup(&s->dev); vhost_dev_free_inflight(s->inflight); g_free(s->vhost_vqs); + s->vhost_vqs =3D NULL; g_free(s->inflight); + s->inflight =3D NULL; =20 for (i =3D 0; i < s->num_queues; i++) { virtio_delete_queue(s->virtqs[i]); diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 01ebe12f28..aff98a0ede 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -1514,7 +1514,7 @@ void vhost_dev_set_config_notifier(struct vhost_dev *= hdev, =20 void vhost_dev_free_inflight(struct vhost_inflight *inflight) { - if (inflight->addr) { + if (inflight && inflight->addr) { qemu_memfd_free(inflight->addr, inflight->size, inflight->fd); inflight->addr =3D NULL; inflight->fd =3D -1; --=20 2.11.0 --=20 The SmartX email address is only for business purpose. Any sent message=20 that is not related to the business is not authorized or permitted by=20 SmartX. =E6=9C=AC=E9=82=AE=E7=AE=B1=E4=B8=BA=E5=8C=97=E4=BA=AC=E5=BF=97=E5=87=8C=E6= =B5=B7=E7=BA=B3=E7=A7=91=E6=8A=80=E6=9C=89=E9=99=90=E5=85=AC=E5=8F=B8=EF=BC= =88SmartX=EF=BC=89=E5=B7=A5=E4=BD=9C=E9=82=AE=E7=AE=B1. =E5=A6=82=E6=9C=AC= =E9=82=AE=E7=AE=B1=E5=8F=91=E5=87=BA=E7=9A=84=E9=82=AE=E4=BB=B6=E4=B8=8E=E5= =B7=A5=E4=BD=9C=E6=97=A0=E5=85=B3,=E8=AF=A5=E9=82=AE=E4=BB=B6=E6=9C=AA=E5= =BE=97=E5=88=B0=E6=9C=AC=E5=85=AC=E5=8F=B8=E4=BB=BB=E4=BD=95=E7=9A=84=E6=98= =8E=E7=A4=BA=E6=88=96=E9=BB=98=E7=A4=BA=E7=9A=84=E6=8E=88=E6=9D=83. 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X-Received-From: 2607:f8b0:4864:20::643 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Li Feng Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @smartx-com.20150623.gappssmtp.com) Content-Type: text/plain; charset="utf-8" double call tcp_chr_free_connection generates a crash. Signed-off-by: Li Feng --- chardev/char-socket.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/chardev/char-socket.c b/chardev/char-socket.c index 185fe38dda..43aab8f24b 100644 --- a/chardev/char-socket.c +++ b/chardev/char-socket.c @@ -476,6 +476,11 @@ static void tcp_chr_disconnect_locked(Chardev *chr) SocketChardev *s =3D SOCKET_CHARDEV(chr); bool emit_close =3D s->state =3D=3D TCP_CHARDEV_STATE_CONNECTED; =20 + /* avoid re-enter when socket read/write error and disconnect event. */ + if (s->state =3D=3D TCP_CHARDEV_STATE_DISCONNECTED) { + return; + } + tcp_chr_free_connection(chr); =20 if (s->listener) { --=20 2.11.0 --=20 The SmartX email address is only for business purpose. Any sent message=20 that is not related to the business is not authorized or permitted by=20 SmartX. =E6=9C=AC=E9=82=AE=E7=AE=B1=E4=B8=BA=E5=8C=97=E4=BA=AC=E5=BF=97=E5=87=8C=E6= =B5=B7=E7=BA=B3=E7=A7=91=E6=8A=80=E6=9C=89=E9=99=90=E5=85=AC=E5=8F=B8=EF=BC= =88SmartX=EF=BC=89=E5=B7=A5=E4=BD=9C=E9=82=AE=E7=AE=B1. =E5=A6=82=E6=9C=AC= =E9=82=AE=E7=AE=B1=E5=8F=91=E5=87=BA=E7=9A=84=E9=82=AE=E4=BB=B6=E4=B8=8E=E5= =B7=A5=E4=BD=9C=E6=97=A0=E5=85=B3,=E8=AF=A5=E9=82=AE=E4=BB=B6=E6=9C=AA=E5= =BE=97=E5=88=B0=E6=9C=AC=E5=85=AC=E5=8F=B8=E4=BB=BB=E4=BD=95=E7=9A=84=E6=98= =8E=E7=A4=BA=E6=88=96=E9=BB=98=E7=A4=BA=E7=9A=84=E6=8E=88=E6=9D=83. 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Tsirkin" , Kevin Wolf , Max Reitz , qemu-block@nongnu.org (open list:Block layer core), qemu-devel@nongnu.org (open list:All patches CC here) Subject: [PATCH 4/4] vhost-user-blk: fix crash in realize process Date: Wed, 15 Apr 2020 11:28:26 +0800 Message-Id: <20200415032826.16701-5-fengli@smartx.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20200415032826.16701-1-fengli@smartx.com> References: <20200415032826.16701-1-fengli@smartx.com> Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::642 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Li Feng Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @smartx-com.20150623.gappssmtp.com) Content-Type: text/plain; charset="utf-8" The crash could be reproduced like this: 1. break vhost_user_write; 2. kill the vhost-user-blk target; 3. let qemu continue running; 4. start vhost-user-blk; 5. see crash! This fix makes changes: 1. set s->connected to true after vhost_dev_init; 2. call vhost_dev_get_config when s->connected is true, otherwise the hdev->host_ops will be nullptr. Signed-off-by: Li Feng --- hw/block/vhost-user-blk.c | 47 +++++++++++++++++++++++++------------------= ---- 1 file changed, 25 insertions(+), 22 deletions(-) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 19e79b96e4..35386b7cb7 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -303,8 +303,6 @@ static int vhost_user_blk_connect(DeviceState *dev) if (s->connected) { return 0; } - s->connected =3D true; - s->dev.nvqs =3D s->num_queues; s->dev.vqs =3D s->vhost_vqs; s->dev.vq_index =3D 0; @@ -318,6 +316,11 @@ static int vhost_user_blk_connect(DeviceState *dev) strerror(-ret)); return ret; } + /* + * set true util vhost_dev_init return ok, because CLOSE event may hap= pen + * in vhost_dev_init routine. + */ + s->connected =3D true; =20 /* restore vhost state */ if (virtio_device_started(vdev, vdev->status)) { @@ -401,6 +404,7 @@ static void vhost_user_blk_device_realize(DeviceState *= dev, Error **errp) VHostUserBlk *s =3D VHOST_USER_BLK(vdev); Error *err =3D NULL; int i, ret; + bool reconnect; =20 if (!s->chardev.chr) { error_setg(errp, "vhost-user-blk: chardev is mandatory"); @@ -433,27 +437,26 @@ static void vhost_user_blk_device_realize(DeviceState= *dev, Error **errp) s->inflight =3D g_new0(struct vhost_inflight, 1); s->vhost_vqs =3D g_new0(struct vhost_virtqueue, s->num_queues); s->connected =3D false; + reconnect =3D false; =20 - qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, vhost_user_blk_even= t, - NULL, (void *)dev, NULL, true); - -reconnect: - if (qemu_chr_fe_wait_connected(&s->chardev, &err) < 0) { - error_report_err(err); - goto virtio_err; - } - - /* check whether vhost_user_blk_connect() failed or not */ - if (!s->connected) { - goto reconnect; - } - - ret =3D vhost_dev_get_config(&s->dev, (uint8_t *)&s->blkcfg, - sizeof(struct virtio_blk_config)); - if (ret < 0) { - error_report("vhost-user-blk: get block config failed"); - goto reconnect; - } + do { + if (qemu_chr_fe_wait_connected(&s->chardev, &err) < 0) { + error_report_err(err); + goto virtio_err; + } + qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, vhost_user_blk_= event, + NULL, (void *)dev, NULL, true); + if (s->connected) { + ret =3D vhost_dev_get_config(&s->dev, (uint8_t *)&s->blkcfg, + sizeof(struct virtio_blk_config)); + if (ret < 0) { + error_report("vhost-user-blk: get block config failed"); + reconnect =3D true; + } else { + reconnect =3D false; + } + } + } while (!s->connected || reconnect); =20 if (s->blkcfg.num_queues !=3D s->num_queues) { s->blkcfg.num_queues =3D s->num_queues; --=20 2.11.0 --=20 The SmartX email address is only for business purpose. 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