On Wed, Apr 15, 2020 at 11:28:24AM +0800, Li Feng wrote:
>
> when s->inflight is freed, vhost_dev_free_inflight may try to access
> s->inflight->addr, it will retrigger the following issue.
>
> ==7309==ERROR: AddressSanitizer: heap-use-after-free on address
> 0x604001020d18 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/virtio/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/qdev-monitor.c:626
> #8 0x555555e51213 in qmp_device_add
> /root/smartx/qemu-el7/qemu-test/qdev-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-test/monitor.c:3404
> #11 0x555555beac8b in monitor_command_cb
> /root/smartx/qemu-el7/qemu-test/monitor.c:4296
> #12 0x555556433eb7 in readline_handle_byte util/readline.c:393
> #13 0x555555be89ec in monitor_read
> /root/smartx/qemu-el7/qemu-test/monitor.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:2013
> #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/qemu-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-test/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
> =>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
> ==7309==ABORTING
>
> Signed-off-by: Li Feng <fen...@smartx.com>
Reviewed-by: Raphael Norwitz <raphael.norw...@nutanix.com>
> ---
> 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:
>
> virtio_err:
> g_free(s->vhost_vqs);
> + s->vhost_vqs = NULL;
> g_free(s->inflight);
> + s->inflight = NULL;
> for (i = 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 = NULL;
> g_free(s->inflight);
> + s->inflight = NULL;
>
> for (i = 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,
>
> 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 = NULL;
> inflight->fd = -1;
> --
> 2.11.0
>
>
> --
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