On 2017/3/16 8:07, Martin K. Petersen wrote:
> Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> writes:
>
> Kefeng,
>
>> 'n = header_length + block_descriptor_length' could be greater than 512,
>> and will lead to oob access, so enlarge transfer buffer to fix it.
>
> Can you share the output of sg_modes -p 0x2a /dev/srN for the offending
> drive?
root@localhost ~]# sg_modes -p 0x2a /dev/sr0
QEMU QEMU DVD-ROM 0.15 peripheral_type: cd/dvd [0x5]
Mode parameter header from MODE SENSE(10):
Invalid block descriptor length=512, ignore
Mode data length=36, medium type=0x70, specific param=0x00, longlba=0
Block descriptor length=0
>> MM capabilities and mechanical status (obsolete), page_control: current
00 2a 12 00 00 71 60 29 00 02 c2 00 02 02 00 02 c2
10 00 00 00 00
Unexpectedly received extra mode page responses, ignore
note: the issue was found in guestos? maybe some bugs exist in qemu?
Kefeng
>
> This mode page is usually much smaller than 512 bytes (typically between
> 32 and 128 bytes).
>
