1. Patchew
  2. QEMU
  3. View series

[PATCH] net: tulip: Restrict DMA engine to memories

Zheyu Ma posted 1 patch 3 years, 5 months ago
Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/qemu tags/patchew/20220821122943.835058-1-zheyuma97@gmail.com
Maintainers: Sven Schnelle <svens@stackframe.org>, Jason Wang <jasowang@redhat.com>
There is a newer version of this series
hw/net/tulip.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
[PATCH] net: tulip: Restrict DMA engine to memories
Posted by Zheyu Ma 3 years, 5 months ago 
The DMA engine is started by I/O access and then itself accesses the
I/O registers, triggering a reentrancy bug.

The following log can reveal it:
==5637==ERROR: AddressSanitizer: stack-overflow
    #0 0x5595435f6078 in tulip_xmit_list_update qemu/hw/net/tulip.c:673
    #1 0x5595435f204a in tulip_write qemu/hw/net/tulip.c:805:13
    #2 0x559544637f86 in memory_region_write_accessor qemu/softmmu/memory.c:492:5
    #3 0x5595446379fa in access_with_adjusted_size qemu/softmmu/memory.c:554:18
    #4 0x5595446372fa in memory_region_dispatch_write qemu/softmmu/memory.c
    #5 0x55954468b74c in flatview_write_continue qemu/softmmu/physmem.c:2825:23
    #6 0x559544683662 in flatview_write qemu/softmmu/physmem.c:2867:12
    #7 0x5595446833f3 in address_space_write qemu/softmmu/physmem.c:2963:18
    #8 0x5595435fb082 in dma_memory_rw_relaxed /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:87:12
    #9 0x5595435fb082 in dma_memory_rw /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:130:12
    #10 0x5595435fb082 in dma_memory_write /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:171:12
    #11 0x5595435fb082 in stl_le_dma /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:272:1
    #12 0x5595435fb082 in stl_le_pci_dma /home/mzy/truman/third_party/qemu/include/hw/pci/pci.h:910:1
    #13 0x5595435fb082 in tulip_desc_write qemu/hw/net/tulip.c:101:9
    #14 0x5595435f7e3d in tulip_xmit_list_update qemu/hw/net/tulip.c:706:9
    #15 0x5595435f204a in tulip_write qemu/hw/net/tulip.c:805:13

Fix this bug by restricting the DMA engine to memories regions.

Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
---
 hw/net/tulip.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/net/tulip.c b/hw/net/tulip.c
index 097e905bec..b9e42c322a 100644
--- a/hw/net/tulip.c
+++ b/hw/net/tulip.c
@@ -70,7 +70,7 @@ static const VMStateDescription vmstate_pci_tulip = {
 static void tulip_desc_read(TULIPState *s, hwaddr p,
         struct tulip_descriptor *desc)
 {
-    const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED;
+    const MemTxAttrs attrs = { .memory = true };
 
     if (s->csr[0] & CSR0_DBO) {
         ldl_be_pci_dma(&s->dev, p, &desc->status, attrs);
@@ -88,7 +88,7 @@ static void tulip_desc_read(TULIPState *s, hwaddr p,
 static void tulip_desc_write(TULIPState *s, hwaddr p,
         struct tulip_descriptor *desc)
 {
-    const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED;
+    const MemTxAttrs attrs = { .memory = true };
 
     if (s->csr[0] & CSR0_DBO) {
         stl_be_pci_dma(&s->dev, p, desc->status, attrs);
-- 
2.25.1
Re: [PATCH] net: tulip: Restrict DMA engine to memories
Posted by Jason Wang 3 years, 5 months ago 
On Sun, Aug 21, 2022 at 8:29 PM Zheyu Ma <zheyuma97@gmail.com> wrote:
>
> The DMA engine is started by I/O access and then itself accesses the
> I/O registers, triggering a reentrancy bug.
>
> The following log can reveal it:
> ==5637==ERROR: AddressSanitizer: stack-overflow
>     #0 0x5595435f6078 in tulip_xmit_list_update qemu/hw/net/tulip.c:673
>     #1 0x5595435f204a in tulip_write qemu/hw/net/tulip.c:805:13
>     #2 0x559544637f86 in memory_region_write_accessor qemu/softmmu/memory.c:492:5
>     #3 0x5595446379fa in access_with_adjusted_size qemu/softmmu/memory.c:554:18
>     #4 0x5595446372fa in memory_region_dispatch_write qemu/softmmu/memory.c
>     #5 0x55954468b74c in flatview_write_continue qemu/softmmu/physmem.c:2825:23
>     #6 0x559544683662 in flatview_write qemu/softmmu/physmem.c:2867:12
>     #7 0x5595446833f3 in address_space_write qemu/softmmu/physmem.c:2963:18
>     #8 0x5595435fb082 in dma_memory_rw_relaxed /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:87:12
>     #9 0x5595435fb082 in dma_memory_rw /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:130:12
>     #10 0x5595435fb082 in dma_memory_write /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:171:12
>     #11 0x5595435fb082 in stl_le_dma /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:272:1
>     #12 0x5595435fb082 in stl_le_pci_dma /home/mzy/truman/third_party/qemu/include/hw/pci/pci.h:910:1
>     #13 0x5595435fb082 in tulip_desc_write qemu/hw/net/tulip.c:101:9
>     #14 0x5595435f7e3d in tulip_xmit_list_update qemu/hw/net/tulip.c:706:9
>     #15 0x5595435f204a in tulip_write qemu/hw/net/tulip.c:805:13
>
> Fix this bug by restricting the DMA engine to memories regions.
>
> Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>

Queued for 7.2.

Thanks

> ---
>  hw/net/tulip.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/hw/net/tulip.c b/hw/net/tulip.c
> index 097e905bec..b9e42c322a 100644
> --- a/hw/net/tulip.c
> +++ b/hw/net/tulip.c
> @@ -70,7 +70,7 @@ static const VMStateDescription vmstate_pci_tulip = {
>  static void tulip_desc_read(TULIPState *s, hwaddr p,
>          struct tulip_descriptor *desc)
>  {
> -    const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED;
> +    const MemTxAttrs attrs = { .memory = true };
>
>      if (s->csr[0] & CSR0_DBO) {
>          ldl_be_pci_dma(&s->dev, p, &desc->status, attrs);
> @@ -88,7 +88,7 @@ static void tulip_desc_read(TULIPState *s, hwaddr p,
>  static void tulip_desc_write(TULIPState *s, hwaddr p,
>          struct tulip_descriptor *desc)
>  {
> -    const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED;
> +    const MemTxAttrs attrs = { .memory = true };
>
>      if (s->csr[0] & CSR0_DBO) {
>          stl_be_pci_dma(&s->dev, p, desc->status, attrs);
> --
> 2.25.1
>
Re: [PATCH] net: tulip: Restrict DMA engine to memories
Posted by Jason Wang 3 years, 5 months ago 
在 2022/8/24 10:26, Jason Wang 写道:
> On Sun, Aug 21, 2022 at 8:29 PM Zheyu Ma <zheyuma97@gmail.com> wrote:
>> The DMA engine is started by I/O access and then itself accesses the
>> I/O registers, triggering a reentrancy bug.
>>
>> The following log can reveal it:
>> ==5637==ERROR: AddressSanitizer: stack-overflow
>>      #0 0x5595435f6078 in tulip_xmit_list_update qemu/hw/net/tulip.c:673
>>      #1 0x5595435f204a in tulip_write qemu/hw/net/tulip.c:805:13
>>      #2 0x559544637f86 in memory_region_write_accessor qemu/softmmu/memory.c:492:5
>>      #3 0x5595446379fa in access_with_adjusted_size qemu/softmmu/memory.c:554:18
>>      #4 0x5595446372fa in memory_region_dispatch_write qemu/softmmu/memory.c
>>      #5 0x55954468b74c in flatview_write_continue qemu/softmmu/physmem.c:2825:23
>>      #6 0x559544683662 in flatview_write qemu/softmmu/physmem.c:2867:12
>>      #7 0x5595446833f3 in address_space_write qemu/softmmu/physmem.c:2963:18
>>      #8 0x5595435fb082 in dma_memory_rw_relaxed /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:87:12
>>      #9 0x5595435fb082 in dma_memory_rw /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:130:12
>>      #10 0x5595435fb082 in dma_memory_write /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:171:12
>>      #11 0x5595435fb082 in stl_le_dma /home/mzy/truman/third_party/qemu/include/sysemu/dma.h:272:1
>>      #12 0x5595435fb082 in stl_le_pci_dma /home/mzy/truman/third_party/qemu/include/hw/pci/pci.h:910:1
>>      #13 0x5595435fb082 in tulip_desc_write qemu/hw/net/tulip.c:101:9
>>      #14 0x5595435f7e3d in tulip_xmit_list_update qemu/hw/net/tulip.c:706:9
>>      #15 0x5595435f204a in tulip_write qemu/hw/net/tulip.c:805:13
>>
>> Fix this bug by restricting the DMA engine to memories regions.
>>
>> Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
> Queued for 7.2.


Ok, I saw v2, so I've queued that version since it has a better change log.

Thanks


>
> Thanks
>
>> ---
>>   hw/net/tulip.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/hw/net/tulip.c b/hw/net/tulip.c
>> index 097e905bec..b9e42c322a 100644
>> --- a/hw/net/tulip.c
>> +++ b/hw/net/tulip.c
>> @@ -70,7 +70,7 @@ static const VMStateDescription vmstate_pci_tulip = {
>>   static void tulip_desc_read(TULIPState *s, hwaddr p,
>>           struct tulip_descriptor *desc)
>>   {
>> -    const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED;
>> +    const MemTxAttrs attrs = { .memory = true };
>>
>>       if (s->csr[0] & CSR0_DBO) {
>>           ldl_be_pci_dma(&s->dev, p, &desc->status, attrs);
>> @@ -88,7 +88,7 @@ static void tulip_desc_read(TULIPState *s, hwaddr p,
>>   static void tulip_desc_write(TULIPState *s, hwaddr p,
>>           struct tulip_descriptor *desc)
>>   {
>> -    const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED;
>> +    const MemTxAttrs attrs = { .memory = true };
>>
>>       if (s->csr[0] & CSR0_DBO) {
>>           stl_be_pci_dma(&s->dev, p, desc->status, attrs);
>> --
>> 2.25.1
>>

Patchew 2.1-devel-b67e4c2

© 2016 - 2026 Red Hat, Inc.