[v2] usb/xchi: avoid trigger assertion if guest write wrong epid

[Qemu-devel] [PATCH v2] usb/xchi: avoid trigger assertion if guest write wrong epid

Posted by Longpeng(Mike) 5 years ago

From: Longpeng <longpeng2@huawei.com>

we found the following core in our environment:
0  0x00007fc6b06c2237 in raise ()
1  0x00007fc6b06c3928 in abort ()
2  0x00007fc6b06bb056 in __assert_fail_base ()
3  0x00007fc6b06bb102 in __assert_fail ()
4  0x0000000000702e36 in xhci_kick_ep (...)
5  0x000000000047897a in memory_region_write_accessor (...)
6  0x000000000047767f in access_with_adjusted_size (...)
7  0x000000000047944d in memory_region_dispatch_write (...)
(mr=mr@entry=0x7fc6a0138df0, addr=addr@entry=156, data=1648892416,
size=size@entry=4, attrs=attrs@entry=...)
8  0x000000000042df17 in address_space_write_continue (...)
10 0x000000000043084d in address_space_rw (...)
11 0x000000000047451b in kvm_cpu_exec (cpu=cpu@entry=0x1ab11b0)
12 0x000000000045dcf5 in qemu_kvm_cpu_thread_fn (arg=0x1ab11b0)
13 0x0000000000870631 in qemu_thread_start (args=args@entry=0x1acfb50)
14 0x00000000008959a7 in thread_entry_for_hotfix (pthread_cb=<optimized out>)
15 0x00007fc6b0a60dd5 in start_thread ()
16 0x00007fc6b078a59d in clone ()

(gdb) f 5
5  0x000000000047897a in memory_region_write_accessor (...)
529	    mr->ops->write(mr->opaque, addr, tmp, size);
(gdb) p /x tmp
$9 = 0x62481a00 <-- last byte 0x00 is @epid

xhci_doorbell_write() already check the upper bound of @slotid an @epid,
it also need to check the lower bound.

Cc: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Longpeng <longpeng2@huawei.com>
---
v1 -> v2:
  1) update the description, include the full backtrace
  2) remove unnecessary check: 'reg == 0'

---
 hw/usb/hcd-xhci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index ec28bee..d8472b4 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -3137,7 +3137,7 @@ static void xhci_doorbell_write(void *ptr, hwaddr reg,
         streamid = (val >> 16) & 0xffff;
         if (reg > xhci->numslots) {
             DPRINTF("xhci: bad doorbell %d\n", (int)reg);
-        } else if (epid > 31) {
+        } else if (epid == 0 || epid > 31) {
             DPRINTF("xhci: bad doorbell %d write: 0x%x\n",
                     (int)reg, (uint32_t)val);
         } else {
-- 
1.8.3.1

Re: [Qemu-devel] [PATCH v2] usb/xchi: avoid trigger assertion if guest write wrong epid

Posted by Philippe Mathieu-Daudé 5 years ago

On 4/30/19 8:21 AM, Longpeng(Mike) wrote:
> From: Longpeng <longpeng2@huawei.com>
> 
> we found the following core in our environment:
> 0  0x00007fc6b06c2237 in raise ()
> 1  0x00007fc6b06c3928 in abort ()
> 2  0x00007fc6b06bb056 in __assert_fail_base ()
> 3  0x00007fc6b06bb102 in __assert_fail ()
> 4  0x0000000000702e36 in xhci_kick_ep (...)
> 5  0x000000000047897a in memory_region_write_accessor (...)
> 6  0x000000000047767f in access_with_adjusted_size (...)
> 7  0x000000000047944d in memory_region_dispatch_write (...)
> (mr=mr@entry=0x7fc6a0138df0, addr=addr@entry=156, data=1648892416,
> size=size@entry=4, attrs=attrs@entry=...)
> 8  0x000000000042df17 in address_space_write_continue (...)
> 10 0x000000000043084d in address_space_rw (...)
> 11 0x000000000047451b in kvm_cpu_exec (cpu=cpu@entry=0x1ab11b0)
> 12 0x000000000045dcf5 in qemu_kvm_cpu_thread_fn (arg=0x1ab11b0)
> 13 0x0000000000870631 in qemu_thread_start (args=args@entry=0x1acfb50)
> 14 0x00000000008959a7 in thread_entry_for_hotfix (pthread_cb=<optimized out>)
> 15 0x00007fc6b0a60dd5 in start_thread ()
> 16 0x00007fc6b078a59d in clone ()
> 
> (gdb) f 5
> 5  0x000000000047897a in memory_region_write_accessor (...)
> 529	    mr->ops->write(mr->opaque, addr, tmp, size);
> (gdb) p /x tmp
> $9 = 0x62481a00 <-- last byte 0x00 is @epid
> 
> xhci_doorbell_write() already check the upper bound of @slotid an @epid,
> it also need to check the lower bound.
> 
> Cc: Gonglei <arei.gonglei@huawei.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> Signed-off-by: Longpeng <longpeng2@huawei.com>

Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>

> ---
> v1 -> v2:
>   1) update the description, include the full backtrace
>   2) remove unnecessary check: 'reg == 0'
> 
> ---
>  hw/usb/hcd-xhci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
> index ec28bee..d8472b4 100644
> --- a/hw/usb/hcd-xhci.c
> +++ b/hw/usb/hcd-xhci.c
> @@ -3137,7 +3137,7 @@ static void xhci_doorbell_write(void *ptr, hwaddr reg,
>          streamid = (val >> 16) & 0xffff;
>          if (reg > xhci->numslots) {
>              DPRINTF("xhci: bad doorbell %d\n", (int)reg);
> -        } else if (epid > 31) {
> +        } else if (epid == 0 || epid > 31) {
>              DPRINTF("xhci: bad doorbell %d write: 0x%x\n",
>                      (int)reg, (uint32_t)val);
>          } else {
>

Re: [Qemu-devel] [PATCH v2] usb/xchi: avoid trigger assertion if guest write wrong epid

Posted by no-reply@patchew.org 5 years ago

Patchew URL: https://patchew.org/QEMU/1556605301-44112-1-git-send-email-longpeng2@huawei.com/



Hi,

This series failed the docker-mingw@fedora build test. Please find the testing commands and
their output below. If you have Docker installed, you can probably reproduce it
locally.

=== TEST SCRIPT BEGIN ===
#!/bin/bash
time make docker-test-mingw@fedora SHOW_ENV=1 J=14 NETWORK=1
=== TEST SCRIPT END ===




The full log is available at
http://patchew.org/logs/1556605301-44112-1-git-send-email-longpeng2@huawei.com/testing.docker-mingw@fedora/?type=message.
---
Email generated automatically by Patchew [https://patchew.org/].
Please send your feedback to patchew-devel@redhat.com

Re: [Qemu-devel] [PATCH v2] usb/xchi: avoid trigger assertion if guest write wrong epid

Posted by Gerd Hoffmann 5 years ago

On Tue, Apr 30, 2019 at 02:21:41PM +0800, Longpeng(Mike) wrote:
> From: Longpeng <longpeng2@huawei.com>
> 
> we found the following core in our environment:
> 0  0x00007fc6b06c2237 in raise ()
> 1  0x00007fc6b06c3928 in abort ()
> 2  0x00007fc6b06bb056 in __assert_fail_base ()
> 3  0x00007fc6b06bb102 in __assert_fail ()
> 4  0x0000000000702e36 in xhci_kick_ep (...)
> 5  0x000000000047897a in memory_region_write_accessor (...)
> 6  0x000000000047767f in access_with_adjusted_size (...)
> 7  0x000000000047944d in memory_region_dispatch_write (...)
> (mr=mr@entry=0x7fc6a0138df0, addr=addr@entry=156, data=1648892416,
> size=size@entry=4, attrs=attrs@entry=...)
> 8  0x000000000042df17 in address_space_write_continue (...)
> 10 0x000000000043084d in address_space_rw (...)
> 11 0x000000000047451b in kvm_cpu_exec (cpu=cpu@entry=0x1ab11b0)
> 12 0x000000000045dcf5 in qemu_kvm_cpu_thread_fn (arg=0x1ab11b0)
> 13 0x0000000000870631 in qemu_thread_start (args=args@entry=0x1acfb50)
> 14 0x00000000008959a7 in thread_entry_for_hotfix (pthread_cb=<optimized out>)
> 15 0x00007fc6b0a60dd5 in start_thread ()
> 16 0x00007fc6b078a59d in clone ()
> 
> (gdb) f 5
> 5  0x000000000047897a in memory_region_write_accessor (...)
> 529	    mr->ops->write(mr->opaque, addr, tmp, size);
> (gdb) p /x tmp
> $9 = 0x62481a00 <-- last byte 0x00 is @epid
> 
> xhci_doorbell_write() already check the upper bound of @slotid an @epid,
> it also need to check the lower bound.
> 
> Cc: Gonglei <arei.gonglei@huawei.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> Signed-off-by: Longpeng <longpeng2@huawei.com>

Added to usb queue.

thanks,
  Gerd