* [PATCH v2] hw/net/can: sja1000 fix buff2frame_bas and buff2frame_pel when dlc is out of std CAN 8 bytes
@ 2021-07-29 12:33 Pavel Pisa
2021-07-29 12:48 ` Philippe Mathieu-Daudé
0 siblings, 1 reply; 3+ messages in thread
From: Pavel Pisa @ 2021-07-29 12:33 UTC (permalink / raw)
To: qemu-devel, Paolo Bonzini, Jason Wang, Qiang Ning,
Philippe Mathieu-Daudé
Cc: Pavel Pisa, qemu-stable, Vikram Garhwal, Jan Charvat, Jin-Yang
Problem reported by openEuler fuzz-sig group.
The buff2frame_bas function (hw\net\can\can_sja1000.c)
infoleak(qemu5.x~qemu6.x) or stack-overflow(qemu 4.x).
Reported-by: Qiang Ning <ningqiang1@huawei.com>
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
---
hw/net/can/can_sja1000.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/hw/net/can/can_sja1000.c b/hw/net/can/can_sja1000.c
index 42d2f99dfb..34eea684ce 100644
--- a/hw/net/can/can_sja1000.c
+++ b/hw/net/can/can_sja1000.c
@@ -275,6 +275,10 @@ static void buff2frame_pel(const uint8_t *buff, qemu_can_frame *frame)
}
frame->can_dlc = buff[0] & 0x0f;
+ if (frame->can_dlc > 8) {
+ frame->can_dlc = 8;
+ }
+
if (buff[0] & 0x80) { /* Extended */
frame->can_id |= QEMU_CAN_EFF_FLAG;
frame->can_id |= buff[1] << 21; /* ID.28~ID.21 */
@@ -311,6 +315,10 @@ static void buff2frame_bas(const uint8_t *buff, qemu_can_frame *frame)
}
frame->can_dlc = buff[1] & 0x0f;
+ if (frame->can_dlc > 8) {
+ frame->can_dlc = 8;
+ }
+
for (i = 0; i < frame->can_dlc; i++) {
frame->data[i] = buff[2 + i];
}
--
2.20.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2] hw/net/can: sja1000 fix buff2frame_bas and buff2frame_pel when dlc is out of std CAN 8 bytes
2021-07-29 12:33 [PATCH v2] hw/net/can: sja1000 fix buff2frame_bas and buff2frame_pel when dlc is out of std CAN 8 bytes Pavel Pisa
@ 2021-07-29 12:48 ` Philippe Mathieu-Daudé
2021-08-02 4:03 ` Jason Wang
0 siblings, 1 reply; 3+ messages in thread
From: Philippe Mathieu-Daudé @ 2021-07-29 12:48 UTC (permalink / raw)
To: Pavel Pisa, qemu-devel, Paolo Bonzini, Jason Wang, Qiang Ning
Cc: qemu-stable, Vikram Garhwal, Jan Charvat, Jin-Yang
"hw/net/can: sja1000 fix buff2frame* when dlc is out of std CAN 8 bytes"
On 7/29/21 2:33 PM, Pavel Pisa wrote:
> Problem reported by openEuler fuzz-sig group.
>
> The buff2frame_bas function (hw\net\can\can_sja1000.c)
> infoleak(qemu5.x~qemu6.x) or stack-overflow(qemu 4.x).
Cc: qemu-stable@nongnu.org
> Reported-by: Qiang Ning <ningqiang1@huawei.com>
> Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
> hw/net/can/can_sja1000.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/hw/net/can/can_sja1000.c b/hw/net/can/can_sja1000.c
> index 42d2f99dfb..34eea684ce 100644
> --- a/hw/net/can/can_sja1000.c
> +++ b/hw/net/can/can_sja1000.c
> @@ -275,6 +275,10 @@ static void buff2frame_pel(const uint8_t *buff, qemu_can_frame *frame)
> }
> frame->can_dlc = buff[0] & 0x0f;
>
> + if (frame->can_dlc > 8) {
> + frame->can_dlc = 8;
> + }
> +
> if (buff[0] & 0x80) { /* Extended */
> frame->can_id |= QEMU_CAN_EFF_FLAG;
> frame->can_id |= buff[1] << 21; /* ID.28~ID.21 */
> @@ -311,6 +315,10 @@ static void buff2frame_bas(const uint8_t *buff, qemu_can_frame *frame)
> }
> frame->can_dlc = buff[1] & 0x0f;
>
> + if (frame->can_dlc > 8) {
> + frame->can_dlc = 8;
> + }
> +
> for (i = 0; i < frame->can_dlc; i++) {
> frame->data[i] = buff[2 + i];
> }
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] hw/net/can: sja1000 fix buff2frame_bas and buff2frame_pel when dlc is out of std CAN 8 bytes
2021-07-29 12:48 ` Philippe Mathieu-Daudé
@ 2021-08-02 4:03 ` Jason Wang
0 siblings, 0 replies; 3+ messages in thread
From: Jason Wang @ 2021-08-02 4:03 UTC (permalink / raw)
To: Philippe Mathieu-Daudé,
Pavel Pisa, qemu-devel, Paolo Bonzini, Qiang Ning
Cc: qemu-stable, Vikram Garhwal, Jan Charvat, Jin-Yang
在 2021/7/29 下午8:48, Philippe Mathieu-Daudé 写道:
> "hw/net/can: sja1000 fix buff2frame* when dlc is out of std CAN 8 bytes"
>
> On 7/29/21 2:33 PM, Pavel Pisa wrote:
>> Problem reported by openEuler fuzz-sig group.
>>
>> The buff2frame_bas function (hw\net\can\can_sja1000.c)
>> infoleak(qemu5.x~qemu6.x) or stack-overflow(qemu 4.x).
> Cc: qemu-stable@nongnu.org
>
>> Reported-by: Qiang Ning <ningqiang1@huawei.com>
>> Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Applied.
Thanks
>
>> ---
>> hw/net/can/can_sja1000.c | 8 ++++++++
>> 1 file changed, 8 insertions(+)
>>
>> diff --git a/hw/net/can/can_sja1000.c b/hw/net/can/can_sja1000.c
>> index 42d2f99dfb..34eea684ce 100644
>> --- a/hw/net/can/can_sja1000.c
>> +++ b/hw/net/can/can_sja1000.c
>> @@ -275,6 +275,10 @@ static void buff2frame_pel(const uint8_t *buff, qemu_can_frame *frame)
>> }
>> frame->can_dlc = buff[0] & 0x0f;
>>
>> + if (frame->can_dlc > 8) {
>> + frame->can_dlc = 8;
>> + }
>> +
>> if (buff[0] & 0x80) { /* Extended */
>> frame->can_id |= QEMU_CAN_EFF_FLAG;
>> frame->can_id |= buff[1] << 21; /* ID.28~ID.21 */
>> @@ -311,6 +315,10 @@ static void buff2frame_bas(const uint8_t *buff, qemu_can_frame *frame)
>> }
>> frame->can_dlc = buff[1] & 0x0f;
>>
>> + if (frame->can_dlc > 8) {
>> + frame->can_dlc = 8;
>> + }
>> +
>> for (i = 0; i < frame->can_dlc; i++) {
>> frame->data[i] = buff[2 + i];
>> }
>>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-08-02 4:04 UTC | newest]
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2021-07-29 12:33 [PATCH v2] hw/net/can: sja1000 fix buff2frame_bas and buff2frame_pel when dlc is out of std CAN 8 bytes Pavel Pisa
2021-07-29 12:48 ` Philippe Mathieu-Daudé
2021-08-02 4:03 ` Jason Wang
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